DC 3rd Prep

_______________ are necessary for complete combustion

A.  Forced draft. turbulance and heat

B.  Fuel oil, air, time and mixture

C.  Time, Temperature, mixture and     atomization

D.  Time, Temperature and draft

Downcomer tubes are found _____________.

A.  on the superheater drain

B.  in the chimney to sample gases of 
     combustion

C.  in a firetube boiler

D.  in a watertube boiler

To cut a boiler in on a line equipped with hand-operated main steam stop valves, the steam pressure on the incoming boiler should be _________.

A.  slightly lower than line pressure
B.  slightly higher than line pressure
C.  equil to line pressure
D.  no diffrent; pressure will equalize

A gas pressure regulator is used to control the __________________.

A.  gases of cumbustion
B.  gas pressure at the burner
C.  air-fuel ratio
D.  gas flow to the burner

After replacing a gauge glass but before placing it in service, it is necessary to _____________.

A.  open the try cock and check the water

B.  crack open the steam valve and warm
     the gauge glass

C.  crack open the water valve and warm
     the gauge glass

D.  tighten the packing gland nuts

Waterwalls should be blown down _________.

A.  daily
B.  weekly
C.  when the furnace is cool
D.  once every six months

As the steam pressure in the boiler increases, there is a corresponding increase in the ____________.

A.  BHP
B.  water level
C.  volume of steam
D.  temperature of steam and water

An economizer located in the path of the gases of combustion increases boiler efficiency approximately 1% for each _____°F rise in feedwater temperature.

A.  5
B.  10
C.  15
D.  20

A dry pipe separator __________________.

A.  delivers higher quality steam to the
     header.

B.  distributes feedwater the length of the
     drum.

C.  prevents water hammer

D.  agitates the water in the steam and
     water.

A tempreature reading of 80°C is equil to _______°F.

A.  52
B.  148
C.  168
D.  176

A steam pressure gauge is protected against excessive temperature by a ______________.

A.  steam trap
B.  siphon
C.  separator
D.  Hartford Loop

A hole is drilled in the end of a staybolt _________.

A.  for expansion and contraction
B.  to warn of a corroded stay
C.  to add strength
D.  no holes are ever drilled in a staybolt

Combustion efficiency can be increased when air is ______________.

A.  filtered
B.  mixed with CO2
C.  preheated
D.  dried

A ____________ allows condensate to pass through, but stops steam.

A.  steam trap
B.  siphon
C.  check valve
D.  bypass

The viscosity of fuel oil is the measurement of the _____ in the fuel oil.

A.  BTU content
B.  fire point
C.  flash point
D.  internal resistance to flow

A scotch marine boiler is easily identified because it ________________.

A.  has a brick setting
B.  has a cylindrical internal furnace
C.  is externally fired
D.  has waterwalls

A boiler has a steaming capacity of 34,500 lb of steam per hour.  The evaporation rate is 10 lbs per square foot of heating surface per hour.  What is the boiler heating surface?

A.  100
B.  1000
C.  3450
D.  6900

The evaporation of 34.5 lb of water from and at 212°F is a standard for _______________.

A.   the number of BTU in 1 lb of coal
B.   1 BHP
C.   performing an evaporation test
D.   calibrationg a calorimeter

Compared to #6 oil, #4 oil has _____ Btu per gallon.

A. more
B. Less
C. the same
D. more if heated

A valve that requires five 360° tuns of the hand wheel to change from fully open to fully closed is a _____________.

A.  quick-opening
B.  blowdown
C.  slow-opening
D.  ball

Sensible heat is ______________.

A.  heat that can be measured with a
     thermometer

B.  970.3 BTU

C.  heat that cannot be measured

D.  heat that changes a substance's state
     but not its temperature

A Ringleman test is used to determine ______________.


A.  CO2 in gases of combustion
B.  smoke density
C.  flame failure
D.  steam quality

A steam pressure gauge  must have a range of at least ____.

A.  the working pressure of the boiler
B.  1-1/2 times the working pressure of the boiler
C.  the MAWP
D.  1½ times the MAWP

Compared to #6 oil, #4 oil has _____ BTU per gallon.

A.  more
B.  less
C.  the same
D.  more if heated

An accumulation test is used to determine ____________.

A.  furnace volume
B.  heating surface
C.  safety valve capacity
D.  the evaporation rate

In a watertube boiler, heat and gases of combustion pass _________.

A.  through the casing
B.  through the tubes
C.  around the tubes
D.  through and around the tubes

A sudden rise in chimney temperature with no increase in load indicates _____________.

A.  a damper is stuck closed
B.  the boiler needs cleaning
C.  there is a broken baffle
D.  there is too much air

On boilers that have both quick-closing and screw-type blowdown vales, the quick-closing valve must be located _______________.

A.  after the screw-type valve
B.  at the NOWL
C.  closest to the boiler and followed by
     the screw-type valve
D.  on the bottom blowdown tank

A scotch marine boiler is  a _____________ boiler.

A.  watertube
B.  cast iron
C.  cast iron firetube
D.  firetube

Automatic combustion controls on a boiler control ____________________.

A. water and fuel ratio
B.  fuel and air ratio
C.  steam ans air ratio
D.  chemical to firing ratio

A boiler generates 1800 lb of steam/hour.  The steam pressure is 150 psi and steam contains 1194 BTU/lb.  The feedwater temperature is 205°F.  What is the developed boiler horsepower? 1C

A.  87
B.  55
C.  66
D.  106

_________ is always necessary in the combustion process.

A.  Nitrogen
B.  Hydrogen
C.  Oxygen
D.  Methane

Staybolts are most commenly found on _______. 

A.  feedwater heaters
B.  firetube boilers
C.  superheater headers
D.  all modern watertube boilers

Pyrometers measure _____________.

A.  air duct velocity
B.  draft
C.  superheater flow
D.  temperature

__________ boilers can operate at higher pressures than firetube boilers.

A.  HRT
B.  Scotch marine
C.  Vertical firetube
D.  watertube

Boilers should be warmed up slowly when starting up to _________ .

A. eliminate water hammer
B. allow uniform expansion of drums and tubes
C. maintain a steady water level
D. prevent an explosion

Waterwall tubes ____.

A. act as stays on tube sheets
B. allow blowdown while the boiler is operating
C. help control water circulation
D. increase boiler heating surface

A manometer is read in _______.

A. inches of water
B. PSIG
C. PSIA
D. None of the above

The low water fuel cutoff can be tested by ________.

A. lifting the lever or handle
B. securing the burner
C. allowing the water level to drop
D. opening the fuel valve

The minimum size manhole is _______.

A. 11"x11"
B. 12"x12"
C. 11"x13"
D. 11"x15"

Boiler waterwalls should be blown down _______.

A. daily
B. weekly
C. when the firebox is cool but the boiler still has pressure
D. every six months

If steam comes out of the bottom try cock, the boiler operator must__________.

A. secure the fires to the boiler, allow the boiler to cool slowly, and notify the chief engineer
B. bypass the try cocks and feed by hand
C. leave the boiler alone; this is normal
D. start up a new feedwater pump

On the feedwater line, the valve closest to the boiler shell is a ______ valve.
 
A. check
B. stop
C. blowdown
D. make up

Draft is measured with a _______.

A. pyrometer
B. hydrometer
C. manometer
D. potentiometer

The amount of excess air in gasses of combustion is normally determined by the analysis of _________.

A. CO2
B. O2
C. CO
D. O

Economizers are used in large plants so that ________.

A. the dew point can be lowered
B. impure feedwater can be used
C. higher flu gas temps can be maintained
D. heat from the gasses of combustion can be reclaimed

Pressure atomizing burners atomize fuel oil using _________.

A. steam pressure
B. air pressure
C. a rotary cup
D. none of the above

waterwall tubes protect the refractory and _____________.

A. increase the boiler heating surface
B. act as stays for tube sheets
C. allow the operator blowdown while steaming
D. help control water circulation

elp co

Viscosity is the internal resistance to fluid flow. No. 6 fuel oil has _______ viscosity.

A. no
B. a high
C. a medium
D. a low

At 0 psi, ______ BTU are necessary to change 1lb of water at 212F into steam.

A. 144
B. 180
C. 970.3
D. 1200

_____ is the difference in pressure between two points of measurement.

A. Draft
B. Feedwater
C. Condensate
D. Carryover

When taking a boiler off-line, a vacuum is prevented by _________.

A. opening the air cock.
B. blowing down
C. dumping the boiler at once
D. popping the safety valve

Fuel oil with a high viscosity _______.

A. is hard to pump
B. is easy to pump
C. is not used in boilers
D. limits the firing rate

____ % of the steam generated in a boiler is used for the steam atomizing burner.

A. Four
B. Eight
C. Twelve
D. Sixteen

A boiler generates 60,000 lb of steam/hr. The pressure is 150 psi. and steam contains 1195 BTU/lb. The feedwater temp is 195*F. What is the equivalent evaporation produced?

A. 98,898 lb/hr
B. 55,575 lb/hr
C. 75,666 lb/hr
D. 63,815 lb/hr

Bituminous coal has a _____ content

A. high volatile
B. high hydrogen
C. high fixed carbon
D. high ash

What is the pressure in PSI at the base of a column of water 250' high and 8'wide?

A.98
B.75
C.108
D.125

Baffles are used in the steam and water drum of water tube boilers to _________.

A. provide better circulation
B. prevent water carryover with the steam
C. prevent fluctuations of the water level
D. clean the steam

Draft is carefully controlled to _________.

A. maintain at least 15% CO on gasses of combustion
B. completely burn fuel supplied to the burner
C. prevent the boiler from overheating
D. maintain high levels of excess air in gasses of combustion

a stop and check valve is installed in the _______.

A. main steam header
B. outlet superheater
C. blowdown line
D. feedwater line

viscosity of fuel oil is a _______.

A. method of finding flash point
B. measure of internal resistance to flow
C. method of finding the fire point
D. method of determining heating value

A water column _________.

A. dampens fluctuating water level
B. must be equipped with ball checks
C. prevents foaming in the guage glass
D. is used on all boilers

In order to reduce the viscosity of a fuel oil its  ________ 

A. temperature must be reduced
B. temperature must be increased
C. pressure must be reduced
D. pressure must be increased

The fyrite analyzer can be used to measure ___________.

A. sulfur dioxide
B. flyash
C. oxygen
D. pounds of steam per hour

Sewer lines are protected from the __________ when blowing down a boiler.

A. steam trap
B. expansion tank
C. blowdown tank
D. compression tank

How many gallons can be pumped into a cylinder 72" in diameter and 20' long?

A. 3842
B. 4238
C. 5666
D. 2332

Oxygen in feedwater causes ______.

A. priming
B. foaming
C. pitting
D. scale

Extra-heavy steel pipe is required on a boiler bottom blowdown line when the pressure is above _______ psi.

A. 100
B. 125
C. 150
D. 175

In a balanced draft system, the pressure in the furnace is approximately _____.

A. +0.1" of water
B. -1.0" of water
C. atmospheric
D. atmospheric + guage

The furnace of an HRT boiler is _________.
A. within the boiler shell
B. constructed without refractory
C. protected from excessive heat
D. outside of the boiler shell

If the firing rate increases on a boiler equipped with a convection type superheater, the superheater temperature will _______.
A. increase
B. decrease
C. stay constant
D. none of the above

What is the output in pounds per hour of a boiler rated at 750hp?
A. 22,875 lb/hr
B. 45,290 lb/hr
C. 25,875 lb/hr
D. 38,275 lb/hr

The safety valve setting on the steam and water drum is _____ the superheater safety valve.
A. lower than
B. higher than
C. the same as
D. none of the above

A watertube boiler has 250 tubes that are 20' long and 3" in diameter. If the boiler produces 1 BHP for every 10sq/ft  of heating surface the maximum BHP it will produce is ________ BHP.
A. 125
B. 392
C. 750
D. 1500

The pour point of a fuel oil is _________.
A. the lowest temperature at which oil will flow
B. its internal resistance to flow
C. only used with lubricating oil
D. the same as its fire point

A boiler produces steam containing 1,198.7 BTU/lb. The feedwater temperature is 190F. What is the factor of evaporation?
A. 2.14
B. 1.07
C. .76
D. 11

_________ is carrying over of particles of water with the steam.
A. Pitting
B. Flashing
C. Splashing
D. Priming

To correct a low water condition __________.
A. decrease feedwater
B. increase firing rate
C. lower firing rate and increase feedwater
D. secure fires

Heat absorbed by water when changing from liquid to steam at the boiling point ______.
A. sensible heat
B. latent heat
C. specific heat
D. superheat

According to ASME code, a high pressure boiler having more than 500 sq/ft of heating surface shall have _________.
A. one safety valve of the proper size
B. one safety valve with a rupture disc
C. two lever type safety valves
D. two or more safety valves

An evaporation test should be performed _______ to check the low water fuel cut off control.
A. daily
B. weekly
C. monthly
D. yearly

The purpose of a vent on the open feedwater heater is to ___________.
A. prevent flooding
B. prevent pressure increase
C. remove oxygen and non-condensable gasses
D. add make up water

The steam line going to the soot blowers is connected to the main _________.
A. steam header
B. steam drum
C. auxilary line
D. pressure reducing station

Overheating of tubes in a water tube boiler is caused by_____ on the ________ of the tubes.
A. scale; inside
B. scale; putside
C. soot; inside
D. soot; outside

If the burner is firing and no water is in the gauge glass, the best procedure to follow is ________.
A. blow down the low water fuel cutoff
B. check the water level with the try cocks
C. shut down the burner and secure the boiler
D. add water to the boiler

A continuous blowdown line is located _____.
A. at the NOWL
B. in the mud drum
C. in the flash tank
D. in the steam and water drum well below the NOWL

When testing the safety valve by hand _____.
A. there should be no pressure in the boiler
B. notify the boiler inspector
C. the boiler should be at least 75% of popping pressure before testing
D. first secure the fires

An open feedwater heater is located ______.
A. above the feedwater pump on the discharge side
B. above the feedwater pump on the suction side
C. in the boiler room
D.between the feedwater pump and the boiler

The maximum size bottom blowdown valves on boilers is_______.
A. 1"
B. 1-1/2"
C. 2"
D. 2-1/2"

When taking over a shift, the first thing to do is check the  _______.
A. water level in each boiler
B. fuel supply
C. flame condition
D. feedwater pumps

Before using soot blowers on a boiler ____.
A. decrease the draft
B. drain the sootblower lines
C. secure all the burners
D. drain the superheater lines

A globe valve installed on the feedwater line between the feedwater pump and boiler has pressure from the feedwater pump _____ the valve disc.
A. under
B. on top of
C. discharge side of
D. none of the above

The feedwater stop valve is found between the ________.
A. boiler and check valve
B. check valve and feedwater pump
C. boiler and feedwater pump
D. boiler and main steam header

Balanced draft is ______.
A. forced draft
B. induced draft
C. below atmospheric pressure at the flue outlet
D. constant furnace pressure slightly below atmospheric pressure

A dearating feedwater  heater removes noncondensable gasses such as air, free oxygen, and co2from the feedwater that can cause ________.
A. corrosion
B. foaming
C. carryover
D. pumps to become vapor bound

A scotch marine boiler has _________.
A. an internal furnace
B. an external furnace
C. a brick setting
D. water tubes

Baffles in a boiler are designed to direct gasses of combustion for close contact with _______.
A. boiler drums
B. boiler heating surface
C. blowdown lines
D. mud drums

A feedwater pump woll become steambound if the __________.
A. steam pressure gets too high
B. water temp in the open feedwater heater gets too high
C. water temp in the closed feedwater heater is too high
D. water level in the open feedwater heater is too high

Baffles are placed between the tubes of the boiler to _______.
A. direct the travels of gasses of combustion
B. braces the tubes
C. prevent bending of the tubes
D. maintain pressure in the furnace

The orsat analyzer is used to determine the _________.
A. required chimney temps
B. combustion efficiency
C. steam quality in the boiler
D. heating value of the fuel

The surface blowdown on a steam boiler is located ___________.
A. at the lowest visible part of the gauge glass
B. on the mud drum
C. at the highest part of the steam and water drum
D. at the NOWL

A boiler generates 100,000 lbs of steam/hr with a factor of evaporation of 1.04. What is its HP?
A. 3,415.5 bhp
B. 2998 bhp
C. 3014.5 bhp
D. 2014.8 bhp

Most furnace explosions are caused by ____.
A. failure to purge the furnace at start up
B. over purging the furnace at start up
C. mechanical failures
D. damaged refractory

_____ combustion is when all fuel is burned up using only the theoretical amount of air.
A. Theoretical
B. Secondary
C. Complete
D. Perfect

A steam pressure gauge has a siphon between the boiler and the pressure gauge to ________.
A. allow for expansion and contraction
B. prevent water from entering the pressure gauge
C. protect the pressure from high steam pressure
D. prevent steam from entering the pressure gauge

An automatic feedwater regulator regulator ________.
A. warns of high or low water
B. maintains a constant water level
C. shuts the burner off in the event of low water
D. adds city water makeup automatically

According to ASME code, the suggested range of a boiler pressure gauge is _______.
A. 1-1/2 to 2 times the safety valve setting
B. 2 times the MAWP
C. not more than 6% above the MAWP
D. gauge pressure plus atmospheric pressure

Before draining a boiler _____.
A. allow the setting to cool
B. call the inspector
C. open blowdown valves with 10psi to 12psi on the boiler
D. use surface blowdown first

A thermostatic steam trap can be used ___.
A. only on low pressure systems
B. on high or low pressure systems
C. only on high pressure systems
D. on non-return condensate systems

A thermostatic steam trap opens when the ______.
A. bucket rises
B. steam enters the trap
C. bellows contract
D. ball

Three types of draft used in power plants are _____.
A. natural, forced and induced
B. natural, forced and gravity
C. natural, flow and induced
D. natural, induced and gravity

An automatic non-return valve is found on the ________.
A. discharge side of the feedwater pump
B. inlet line to the open feedwater heater
C. boiler main steam line, between the main stop valve and the header
D. boiler main steam line between the boiler and the main stop valve

A broken baffle on a watertube boiler would cause ______.
A. tube to leak
B. increase in steam pressure
C. increase in chimney temperature
D. carryover

When making a hydrostatic test on a boiler, the safety valves must be _______.
A. kept free to pop at set pressure
B. set at 1-1/2 times the MAWP
C. plugged at the discharge end
D. gagged or removed, and the openings must be blank flanged

If the steam valve to the gauge glass is closed or the top line is clogged, the gauge glass will be _______.
A. full
B. half full
C. three quarters full
D. empty

The frequency of performing a bottom blowdown is determined by ______.
A. steaming capacity
B. boiler water analysis
C. operating routine
D. operator on shift

A boiler is producing 40,000 lb of steam/hr at a pressure of 100psi and a steam temperature of 500F. The steam produced is _________ steam.
A. supersaturated
B. desuperheated
C. superheated
D. saturated

The function of the fuel oil burner is to ____.
A. preheat the fuel oil
B. pump the fuel oil into the fire box
C. atomize the fuel oil completely
D. pump fuel oil back into the fuel oil tank

A deposit of scale or mud in an HRT boiler could cause _________.
A. a bag to develop
B. a draft loss
C. overheating of the breeching
D. lowering of the chimney temperature

When a quick opening valve is used as a blowdown, it is located ______.
A. before the flash tank
B. between the slow opening valve and the blowdown tank
C. between the boiler and the slow opening valve
D. on the continuous blowdown line

Overheating of tubes on a boiler can be caused by ________.
A. rapid circulation of water
B. scale on tubes
C. high water level
D. low firing rate

An orsat analyser measures ______ in gasses of combustion.
A. carbon dioxide
B. oxygen
C. carbon monoxide
D. all of the above

Feedwater is treated chemically before it enters the boiler to _____.
A. prevent foaming
B. eliminate blowing down the boiler
C. change the scale forming salts to a sludge that will stick to the heating surface, making cleaning easier
D. change the scale forming salts to non-adhering sludge

A bottom blow down on a boiler is performed to _______.
A. remove surface scum
B. test for water level
C. test safety valves
D. discharge sludge and sediment

The first step when using a soot blower is  ___________.
A. open the steam line drain
B. warm up the steam lines slowly
C. turn soot blower elements slowly
D. actuate steam turbine blades

combustion requires __________.
A. fuel, oxygen and carbon dioxide
B. fuel, oxygen and heat
C. fuel, oxygen and draft
D. fuel, oxygen and carbon monoxide

Boilers in a battery, equipped with _______ must have two main steam stop valves and a free blowing drain between them.
A. common blowdown lines
B. manhole openings
C. handhole openings
D. continuous blowdown lines

If a boiler evaporates 50,000 lb of steam/hr and is evaporating 10lb of steam/sq ft.of heating surface, the heating surface of the boiler is ______sq ft.
A. 50
B. 500
C. 5000
D. 50,000

A ___________ is an electric output device that converts electrical energy into a linear mechanical force.
A. pushbutton
B.  limit switch
C.  motor
D.  solenoid

A ___________ is a control device that uses a small current to energize or de-energize  the load connected to it.
A.  voltage regulator
B.  contactor
C.  limit switch
D.  light switch

______________ contacts may be added to a contractor to form an electrical holding circuit.
A.  normally closed
B.  auxiliary
C.  heavy duty
D.  all of the above

A second start pushbutton added into a control circuit is connected in ___________ with the first pushbutton.
A.  random order
B.  parallel
C.  a wye-configuration
D.  none of the above

A ______________ prevents both the high and low contacts of a contractor from being closed at the same time.
A.  knife switch
B.  mechanical interlock
C.  overload relay
D.  heater unit

____________ current is unwanted current induced in the metal structure of a device due to a rate of change in the induced magnetic field.
A.  stray
B.  eddy
C.  full load
D.  starting

A __________ control circuit includes a holding circuit interlock (memory).
A.  two-wire
B.  jogging
C.  three-wire
D.  interlocking

Selection of thermal overload heaters or the setting of an electronic overload is based on the _________ rating shown on the motor nameplate.
A.  full-load current
B.  locked rotor current
C.  voltage
D.  frequency

Magnetic motor starters include __________ that detects excessive current passing through a motor.
A.  auxiliary contacts
B.  power contacts
C.  overload relays
D.  resistors

A transformer that steps 240v down to 120v has a power ratio of _____________.
A.  1:4
B.  2:1
C.  1:1
D   4:1

A ___________ connection has each coil end connected end to end from a closed loop.
A.  delta
B.  wye
C.  series
D.  parallel

The _____________ is the link between the power delivered to a building and the start of the local distribution system throughout a building.
A.  disconnector
B.  transformer
C.  switchboard
D.  circuit breaker

A __________ is a wall mounted distribution cabinet containing over current and short circuit protection for lighting and appliance branch circuits.
A.  outlet box
B.  panelboard
C.  receptacle box
D.  disconnect

Fuses are connected in _____ with a circuit to protect it from over currents.
A.  series
B.  series/parallel
C.  parallel
D.  none of the above

In a transformer, a marking of X1 or X2 indicates the ___________ voltage side.
A.  high
B.  low
C.  parallel
D.  none of the above

A __________ is a reusable OCPD that opens a circuit automatically at a predetermined over current.
A.  fuse
B.  current sensing relay
C.  circuit breaker
D.  non of the above

The power capacity of a transformer is rated in __________.
A.  KW
B.  voltes
C.  KV
D.  VA

Switchboards are rated as to the maximum voltage and ___________ they can handle.
A.  ohms
B.  heat
C.  watts
D.  amps

In a delta system phase current is ___________ as (than) line current.
A.  higher
B.  equal to
C.  lower
D.  same

The most common contact block includes ___________.
A.  one NO contact
B.  one NC contact
C.  one NO and one NC contact
D.  two NO and two NC contacs

A ____________ switch detects a set amount of force and activates electrical contacts when the set amount of force is reached.
A.  pressure
B.  limit
C.  selector
D.  foot

A ___________ temperature-sensitive device that changes its electrical resistance witha  change in temperature.
A.  thermocouple
B.  thermistor
C.  bimetallic sensor
D.  capiliary tube

A __________ control is used in the level control application in which a small distance exists between when a motor must turn on and when a motor must turn off.
A.  one-level
B.  two-level
C.  low pressure
D.  high pressure

A ________device includes an electronic circuit that provides communication and diagnostic capabilities of the device.
A.  solid-state
B.  automatic
C.  two-level
D.  smart

_________ is the unbalance that occurs when power lines are out-of phase.
A.  phase unbalance
B.  cycle variance
C.  voltage unbalance
D.  sine wave alteration

______________is the maximum condition of voltage unbalance.
A.  no voltage
B.  single phasing
C.  voltage surge
D.  voltage dip

Protection against __________ is required on all motors that are used in personnel transportation equipment such as escalators.
A.  overcycling
B.  overloading
C.  grounding
D.  improper phase sequence

___________ results in the burning and opening of the first turns of the motor windings.
A.  high-altitude operation
B.  single phasing
C.  voltage surge
D.  voltage unbalance

A motor operates satisfactorily with a maximum voltage variation of + or - _________% from the voltage rating listed on the motor nameplate.
A.  2
B.  10
C.  5
D.  15

The longer a motor takes to accelerate, the ________
A.  faster the motor runs
B.  higher the temperature rise in the motor
C.  lower the temperature rise in the motor
D.  more efficient the motor operates

Even blackening on all motor winding occurs from a _____________ condition.
A.  voltage surge
B.  overloading
C.  phase loss
D.  phase unbalance

A ____________ is a device that detects insulation deterioration by measuring high resistance values under test voltage conditions.
A.  ohmmeter
B.  voltmeter
C.  megohmmeter
D.  ammeter

A _________ test creates electrical stress on internal insulation cracks to reveal aging or damaged not found during other motor insulation tests.
A.  insulation step voltage
B.  insulation spot
C.  dielectric absorbtion
D.  Megohmmeter

Does the current lead or lag the applied voltage in a capacitive circuit?

In a three phase wye-connected system phase current and line current are in what relation?

In a delta connection, phase current is higher or lower than the line current?
A.  higher
B.  lower

How many degrees are the voltages out of phase in a three phase circuit?

Which set of windings of a transformer are connected to the load?

In a step-up transformer which is higher voltage?
A.  Primary
B.  Secondary

Which is an isolation transformer?

What is the tagged or orange wire of the three phase transformer known as?

What type of current is produced in all generators?

How do you change the direction of rotation on a three phase motor?

How do you change the rotation of a split phase motor?

What principle do all three phase motors operate on?

What is a centrifugal switch?  What motors use centrifugal switches?

What are the three basic types of split phase motors?

What is the difference between the start and run windings in a resistive start induction run motor?

in three phase wye-connected system the line voltage is higher than the phase voltage by what factor?

A boiler operating at 125 psi the diameter of the steam and water drum head is 3'. The total force acting on the drum head is ____LBS.

A. 127
B.1272
C.12,723
D.127,235

If the feedwater temp is increased without a change in the firing rate, the steam ______.
A. flow will decrease
B.flow will increase
C. flow will remain constant
D. temperature will increase

In a pressure atomizing burner, the atomization of the oil is accomplished by___. 
A. steam pressure
B. air pressure
C. a rotating cup
D. a sprayer plate and tip

If the suction valve in a reciprocating compressor is leaking slightly, the ___________.
A.  cooling capacity will be reduced
B.  flow rate of refrigerant through the system will increase
C.  compressor can overheat
D.  both A & C

What could happen if a semi-hermetic compressor is operated with the suction service valve backseated and the discharge valve frontseated?
A.  The system will pump down.
B.  The system will pump out.
C.  The head of the compressor may blow off.
D.  The compressor capacity will increase.

Liquid entering the compression chamber of a reciprocating compressor can lead to __________.
A.  damaged valves
B.  damaged piston rings
C.  damaged expansion valves
D.  both A & B

The temperature of the compressed gas leaving the compressor can best be described as __________.
A.  cold
B.  cool
C.  warm
D.  very warm

The screw-type compressor is used primarily in ________________.
A.  large industrial refrigeration and air-conditioning systems.
B.  residential air conditioning
C.  small commercial refrigeration units
D.  domestic refrigerators

Rotary compressors are used primarily in ______________.
A.  large industrial refrigeration and air conditioning systems
B.  residential air conditioning
C.  small commercial refrigeration units
D.  domestic refrigerators

The discus valve design is more efficient than a flapper valve design because _________________.
A.  it allows a compressor design with less clearance volume
B.  it operates with less spring tension
C.  the amount of expanded vapor in the cylinder is greater

Which of the following terminal combinations would show an open circuit if the internal overload device in a hermetic compressor should open due to excessive heat?
A.  common to start
B.  common to run
C.  start to run
D.  both A & B

A refrigeration system in operating with a vapor charged thermostatic expansion valve.  The thermal bulb is sensing a suction line temperature that is higher than the temperature that allows liquid to be present in the bulb.  Any additional increases in the evaporator load will _________________.
A.  increase the bulb pressure and cause the thermostatic expansion valve to open
B.  increase the evaporator pressure and cause the thermostatic expansion valve to close
C.  decrease the spring pressure and cause the thermostatic expansion valve to open
D.  have no effect on the position of the needle (pin) in the seat

If a thermostatic  expansion valve thermal bulb came loose from the suction line at the outlet of the evaporator, which of the following could result?
A.  The bulb pressure would increase and the thermostatic expansion valve would open
B.  The superheat in the evaporator would decrease
C.  Liquid refrigerant woudl flow back to the compressor
D.  All of the above are correct

If the thermal bulb assembly develops a leak, what will occur?
A.  All the systems refrigerant will leak out
B.  The bulb pressure will reduce and the valve will close
C.  The valve will open to allow more refrigerant to flow
D.  It will have no effect on the system operation

The primary function of an expansion device is to ______________.
A.  produce a reduction in the pressure of the liquid refrigerant
B.  regulate the flow of refrigerant into the evaporator
C.  lower the boiling point of the refrigerant into the evaporator far enough below the temperature of the load to get the needed heat transfer rate
D.  all of the above

A thermostatic expansion valve controls refrigerant flow to the evaporator based on ______________.
A.  rate of liquid vaporization
B.  evaporator suction line superheat
C.  external equalizer pressure
D.  all of the above

The purpose of the capillary tube is to ________________.
A.  regulate the refrigerant flow of the evaporator
B.  lower the pressure of the liquid refrigerant
C.  lower the boiling point of the liquid refrigerant
D.  all of the above

The TXV sensing bulb is mounted _________.
A.  on the liquid line between the condenser and the TX valve
B.  at the inlet to the condenser
C.  on the suction line between the evaporator and the compression
D.  on the compressor discharge line

The benefits of electric baseboard heating are that _______________.
A.  each room can be controlled individually
B.  they are inexpensive to install
C.  they operate on a 24-V power supply
D.  both A & B

What would happen if the fan on an electric unit heater burned out?
A.  The heater would remain energized until the fusible link melts.  
B.  The interlock switch would de-energize the electric heater.
C.  The unit will still hear the area, but it would take longer to do so.
D.  Both A & B are possible.

Technician "A" says that a fusible link can be jumped out temporarily to allow the customer to get heat until the next business day.  Technician "B" says that if the fuses keep on blowing on the electric duct heater, the fan may be defective.  Which of the following statements is correct?
A.  Technician "A" is correct.  Technician "B" is correct. 
B.  Technician "A" is correct.  Technician "B" is incorrect. 
C.  Technician "A" is incorrect.  Technician "B" is correct. 
D.  Technician "A" is incorrect.  Technician "B" is incorrect.

If a duct-mounted electric heater is to be installed and it is discovered that the heater is too long to fit inside the duct (the duct is 10 inches high and 14 inches wide and the heater is 9 1/2 inches high and 18 inches long), what can the technician do to properly complete the installation?
A.  Install the heater at an angle 
B.  Cut a slot in the duct work and allow the heater to protrude 4 inches out of the duct. 
C.  Return the heater to the supply house an obtain the correct size heater. 
D.  Cut the ends of the coils off the heater and increase the fan speed.

The resistance wire used in electric heating elements is usually ______________.
A.  copper
B.  nickle steel
C.  nickel chromium
D.  aluminum

Radiant heat is transferred by ____________.
A.  ultraviolet rays
B.  infrared rays
C.  ionization
D.  refraction

Electric baseboard heaters are classified as ____________.
A.  natural draft convectors
B.  forced draft convectors
C.  forced draft conductors
D.  radiant heaters

Quartz and glass panel electric units are classified as ______________.
A.  natural draft convectors
B.  forced draft convectors
C.  forced draft conductors
D.  radiant heaters

An electric heating unit in a duct system is classified as a _____________________.
A.  natural draft convectors
B.  forced draft convectors
C.  forced draft conductors
D.  radiant heat

A 10Kw heating element, operating on rated 240 V, will have a Btu output of __________.
A.  29,319
B.  31,062
C.  34,130
D.  35,875

The limit switch is used on the electric element assembly to ________________.
A.  start the unit if the thermostat malfunctions.
B.  ensures that the fan stops when the unit cools down.
C.  start the unit prematurely on a cold day
D.  open the circuit to the element if the furnace overheats.

Generally speaking, electric heat is very efficient but costs more when compared to oil and gas.
A.  True
B.  False

One potential safety hazard that all technicians should be aware of when working on and electric furnace is that there are many exposed electrical connections.
A.  True
B.  False

For maximum element life, the element must have sufficient air over all parts of the element to prevent any par of the element from glowing red.
A.  True
B.  False

Electric heating units provide almost instant heat.  Therefore, anticipators are not needed in electric heat thermostats.
A.  True
B.  False

All electric furnaces use package sequencers.
A.  True
B.  False

If the number two contact on a package sequencer fails to close, the number three contact can still close.
A.  True
B.  False

If a critically charged refrigeration system is overcharged, which of the following is a likely result?
A.  increased  cooling capacity
B.  reduced compressor discharge temperature
C.  increase system efficiency
D.  increased operating pressures

Fractionation occurs when _________________.
A.  some of the blended refrigerant evaporates or condenses before the rest of the blend
B.  when only a fraction of the total charge has been added to the system
C.  the operating pressures of the system increase
D.  Both A & C

When charging a refrigeration system with a near-azeotropic mixture, what must be done to prevent liquid form entering the system?
A.  Charge only as a vapor though the high side
B.  Charge only liquid through the high side
C.  chared as a liquid through the low side using a restrictor.
D.  Charge as a vapor through the low side using a resistor.

Charging a refrigeration system refers to  _____________.
A.  removing refrigerant to a system
B.  adding refrigerant to a system
C.  cleaning the refrigerant
D.  vaporizing the refrigerant

If 22oz of refrigerant are to be added to a refrigeration system and the supply cylinder weights 24 lbs 12 oz before any is added, what will the supply cylinder weight after the system has been charged?
A.  22 lbs 12 oz
B.  22 lbs 6 oz
C.  22 lbs 8 oz
D.  22 lbs 6 oz

If 30 oz of refrigerant are to be added to a refrigeration system and the supply cylinder weights 26 lbs 4 oz before any is added, what will the supply cylinder weigh after the system has been charged?
A.  22 lbs 8 oz
B.  24 lbs 6 oz
C.  24 lbs 8 oz
D.  22 lbs 4 oz

Refrigerant in liquid form is normally put into the system through the _________________.
A. liquid line
B.  suction line
C.  hot gas line
D.  liquid return line

Refrigerant in vapor for is normally put into the system through the ______________.
A.  liquid line
B.  suction line
C.  hot gas line
D.  liquid return line

When charging liquid refrigerant from a single valve cylinder the cylinder will become ______________. 
A.  cold
B.  very warm
C.  the same temperature as the ambient air

When charging liquid refrigerant from a single valve supply cylinder, the cylinder is placed ___________.
A.  upside down
B.  right side up
C.  on its side
D.  in any position indicated

A graduated cylinder charging device is a device that ___________.
A.  measures refrigerant by volume for precise refrigerant charging.
B.  has a compensation dial for adjusting for the temperature of the refrigerant
C.  often has a heater to keep the refrigerant temperature from dropping when refrigerant is released into the system
D.  all of the above

The factory charge in a split system, using R-22, shows 6 lb 8 oz in the outdoor condensing unit and 2 oz in the evaporator.  The 3/8" liquid line contains 0.48 oz per foot and the 7/8" suction line contains 0.10 oz per foot.  The refrigerant lines are 30' long.  What is the correct refrigerant charge for this system?
A.  6 lbs 10 oz
B.  6 lbs 15 oz
C.  7 lbs 7 oz
D.  7 lbs 11 oz

Glide is the range of temperature/pressures in which a blended refrigerant will condense.
A.  True
B.  False

One good feature of an electronic charging scale is that it counts upward as refrigerant is removed, to tell the technician how much refrigerant was used.
A.  True
B.  False

The quickest method to charge a system is to charge only vapor.
A.  True
B.  False

When adding refrigerant in vapor form to a refrigeration system, the system motor/compressor assembly is running.
A.  True
B.  False

Using a restrictor, liquid refrigerant can be charged into the low-side of the system with the system operating.
A.  True
B.  False

A manufacturer's charging chart may be used when available to determine the correct charge for a system.
A.  True
B.  False

The charging device that holds refrigerant, has a visible column of liquid, and can be used to "visually" see the amount of refrigerant used is called the ___________________.

Refrigerant in vapor for is added tot he sytem through the _________________ side of the system.

When the refrigerant cylinder is connected to an operating system, the pressure in the cylinder will be ______________ than the suction pressure of the system.

As refrigerant vapor is removed from a supply cylinder, the pressure in the supply cylinder will ______________.

When a control is required to control space or produce temperature it is called a _____________.
A.  safety device
B.  thermostat
C.  pressure control
D.  speed control

A thermal system overload may occur if a specific electrical or mechanical component is not cooled properly, resulting in _________________.
A.  underload
B.  failure
C.  overheating

The control that stops the condensing unit if the head pressure climbs too high is classified as a _______________.
A.  safety control
B.  thermostat
C.  temperature control
D.  speed control

The automatic control of the system is intended to _______________.
A.  maintain the working conditions of the equipment with a controllable device
B.  prevent overloading situations
C.  maintain stable or constant conditions with a controllable device

What color is the R-134A cylinder?

What refrigerant replaced R-12?

What color is R-410A cylinder?

What is the heart of the refrigeration cycle?

Which pump is a positive displacement pump?

What is the order of the brine cycle?

What coal has the highest fixed carbon content?

The three "T's" of combustion are?

The Btu content for #4 fuel oil is?

What furnace uses flange and reinforcement rings?

The metals most commonly used in a bimetal temperature control are ____________.
A. copper and brass
B.  copper and steel
C.  brass and steel
D.  brass and aluminum

A thermocouple is a device that ___________.
A.  converts heat to mechanical movement
B.  converts heat to current flow
C.  converts heat to electrical energy
D.  couples two temperature controls together

The boiling point of water is no affected by boiler pressure.
A.  True
B.  False

In the closed feedwater heater, steam and water come into direct contact with each other.
A.  True
B.  False

It is necessary to blow down a boiler if proper feedwater treatment is used.
A.  True
B.  False

Both stop and check valves must be installed on the boiler feedwater line.
A.  True
B.  False

The discharge outlet size of a safety valve must not be restricted or reduced.
A.  True
B.  False

A safety valve discharge line cannot be discharged outside of the boiler room.
A.  True
B.  False

In a pop-type safety valve, the huddling chamber is constructed to assist in opening the valve.
A.  True
B.  False

If a safety valve leaks after testing, the valve should be fully opened using the test lever.  If the valve continues to leak, the boiler should be removed from the line as soon as possible and the safety valve should be repaired or replaced.
A.  True
B.  False

The dry drum method of boiler lay-up requires the boiler to  be opened and air to be circulated to keep the boiler drums and tubes dry.
A.  True
B.  False

No, 6 fuel oil burns with a clean flame when it's not heated.
A.  True
B.  False

The most common causes of boiler accidents or explosions are low water and insufficient purging of the combustion space.
A.  True
B.  False

The dry pipe separator is in the steam and water drum.
A.  True
B.  False

The dry pipe separator increases the quality of steam leaving a steam boiler.
A.  True
B.  False

A change in water pressure will change the boiling point of water.
A.  True
B.  False

The largest heat loss in a boiler is cause by heat being carried with the gases of combustion to the atmosphere.
A.  True
B.  False

In a natural draft system, the lowest draft reading is obtain at the furnace.
A.  True
B.  False

The main function of a continuous blowdown system is to lower the total concentration of solids in the boiler.
A.  True
B.  False

The high and low water level alarm floats are components of the boiler feedwater system.
A.  True
B.  False

A calorimeter measures excess air being used for combustion.
A.  True
B.  False

When conducting a hydrostatic test, all safety valves are either gagged or removed and blank flanged, and the pressure is increased to 1 1/2 time the MAWP.
A.  True
B.  False

Purging a furnace before firing can prevent a furnace explosion.
A.  True
B.  False

The forced and induced draft fans on a boiler are the same size and operate at the same speed.
A.  True
B.  False

Three methods of heat transfer are radiation, convection and conduction.
A.  True
B.  False

Safety valves are located on the uppermost part of the steam and water drum and the outlet of the superheater header.
A.  True
B.  False

All boilers are equipped with a water column.
A.  True
B.  False

To ensure good heat transfer in a firetube boiler, the outside of the tubes are kept clean by __________.
A.  soot blowers
B.  recommended feedwater treatment
C.  daily surface blwodowns
D.  overfire air

When economizers are used to heat boiler feedwater, every 10% rise in feedwater temperature is accompanied by a _____% savings in fuel.
A.  0.25
B.  1
C.  5
D.  10

______________ is necessary to burn the volatile matter in coal more efficiently.
A.  Underfire air
B.  Overfire air
C.  An increased amount of moisture in coal
D.  Some anthracite coal

The pour point of fuel oil is the _____________ temperature at which fuel oil will ____________
A.  lowest; burn
B.  lowest; flow
C.  highest; burn
D.  highest; flow

Water hammer in steam lines is caused by ______________.
A.  low steam pressure
B.  high steam pressue
C.  condensation in the line
D.  a sudden drop in plant load

The safety valve on the boiler drum and superheater safety vales of a steam boiler are set so that ______________.
A.  both drum safety valves open together
B.  only on drum safety valve opens
C.  the superheater safety valve opens first
D.  one drum safety valve opens and then the superheater safety valve opens

The frequency of blowing down the boiler can best be determined by ______________.
A.  the boiler operator
B.  the boiler inspector
C.  the blowdown meter
D.  testing the boiler water

To obtain complete combustion of a fuel, ________, ___________, and _____________ are required.
A.  mixture, atomization; and time
B.  C02; 02; C0; and C03
C.  turbulence, feedwater; air; flu gas
D.  hot refractory; air; draft; gases of combustion

A furnace explosion can be prevented by __________.
A.  checking the water level once a shift
B.  testing the safety valves once a month
C.  purging after ignition failure
D.  testing the safety valve regularly

An economizer heats ____________.
A.  steam
B.  air for combustion
C.  fuel oil
D.  feedwater

The Btu content of natural gas is ____ Btu per____.
A.  100,000; therm
B.  100,000; cubic foot
C.  152.000; therm
D.  152,000; cubic foot

The boiler feedwater stop valve is between the _______ and _______.
A. boiler; check valve
B.  check valve; feedwater pump
C. boiler; feedwater pump
D.  boiler main header

To test a low water fuel cutoff using an evaporation test, the boiler operator must _______.
A. open the feedwater stop valve
B.  secure all of the feedwater going to the boiler
C.  completely drain the regulator chamber
D.  have an inspector on hand

To prevent a vacuum from forming on a boiler that is coming off-line, ___________.
A.  open the air dock
B.  blow down the boiler
C.  dump the boiler
D.  pop the safety valve

Staybolts are most commonly found on _________.
A.  feedwater heaters
B.  firetube boilers
C.  superheater headers
D.  all modern watertube boilers

Overheating of tubes in a watertube boiler is caused by _________ on the ___________ of the tubes.
A.  scale; inside
B.  scale; outside
C.  soot; inside
D.  soot; outside

The viscosity of fuel oil is the measurement of the ____________ in the fuel oil.
A. Btu content
B.  fire point
C.  flash point
D.  internal resistance to flow

Feedwater is treated chemically before it enters the boiler to ____________________.
A. prevent foaming
B. eliminate blowing down the boiler
C.  change the scale-forming salts to a sludge that will stick to the heating surface, making cleaning easier
D.  change scale-forming salts to a nonadhearing sludge

Complete combustion is defined as burning all fuel using _____________.
A.  the theoretical amount of air
B.  a minimal amount of excess air
C.  non excess air
D.  C02 and C0

When testing the safety valve by hand, _______.
A.  there should be no pressure in the boiler
B.  notify the boiler inspector
C.  the boiler should be at least 75% of popping pressure before testing
D.  first secure the fires

A boiler steam pressure of 100 psi with a temperature of 500degrees indicates _______________.
A.  dry steam
B.  supersaturated steam
C.  superheated steam
D.  steam at its corresponding pressure and temperature

A broken baffle in a watertube boiler causes ___________.
A.  smoke to come from the chimney
B.  a rise in chimney temperature
C.  a drop in chimney temperature
D.  steam to come from chimney

Before laying up a boiler, the boiler operator must _____________.
A.  notify the boiler inspector
B.  remove  the boiler certificate
C.  thoroughly clean the fire and water sides
D.  clean only the water side because soot acts as an insulator

While replacing a broken guage with the boiler under pressure, the water level is checked by ____________.
A.  blowing down the water column
B.  giving the boiler a bottom blow
C.  using try cocks
D.  using air cocks

A closed feedwater heater is located ______________.
A.  above the feedwater pump on the discharge side
B.  above the feedwater pump on the suction side
C.  in the boiler room
D.  between the feedwater pump and the boiler

To start a turbine pump, the discharge valve should be _______________.
A.  closed
B.  opened
C.  primed
D.  there is no discharge valve

To cut a boiler in on a line equipped with hand-operated main steam stop valves, the steam pressure on the incoming boiler should be ______________________.
A.  slightly lower than line pressure
B.  slightly higher than line pressure
C.  equal to line pressure
D.  no different; pressure will equalize

Boiler waterwalls should be blown down _______________.
A.  daily
B.  weekly
C.  when the firebox is cool but the boiler still has pressure
D.  every six months

Before draining a boiler, the operator should ___________.
A.  allow the setting to cool
B.  call the boiler inspector
C.  open the blowdown valves with 12 psi on the boiler
D.  us the surface blow

A safe maximum water concentration of contaminates in steam generators serving low makeup plants is maintained by _____________.
A.  daily blowdowns
B.  continuous blowdown
C.  surface blowdowns
D.  increased makeup

A vaporstat control is sensitive to ______________.
A.  pressure
B.  temperature
C.  electicity
D.  infrared rays

According to the ASME Code, if a boiler has a MAWP that exceeds 100 psi, the boiler must have ______________ blowdown valve(s).
A.   1
B.   3
C.   2
D.   0

According to the ASME Code, the minimum size pipe connecting the water column to the boiler is ________".
A.  1/2
B.  1
C.  1 1/2
D.  2

The air-proving switch attached to the housing of a fully automatic rotary cup burner opens when there is ___________________.
A.  low oil pressure
B.  fan failure
C.  excess primary air
D.  excess secondary air

For the efficient combustion of pulverized coal, it is necessary to maintain ________.
A.  50% excess air
B.  a high furnace temperature
C.  a low furnace temperature
D.  positive furnace pressure

When using  No. 6 fuel oil, the boiler operator must____________.
A.  blend it with No. 2 fuel oil
B.  bring it up to its flash point int he tank
C.  heat the fuel oil as it comes from the fuel oil tank
D.  No. 6 fuel oil should never be heated

The function of the fuel oil burner is to ______________.
A.  preheat the fuel oil
B.  pump fuel oil into the firebox
C.  atomize the fuel oil completely
D.  pump fuel oil back to the fuel oil tank

In a three-element feedwater regulating system, __________ are measured.
A.  steam flow, fuel flow, and feedwater flow
B.  feedwater flow, water leveal, and condensate return
C.  make up water, condensate return, and water level
D.  steam flow, feedwater flow, and water level

The check valve on the boiler feedwater line _____________.
A.  controls the flow of feedwater in one direction only
B.  allows the stop valve to be repaired without dumping the boiler
C.  allows the water level in the boiler to equalize
D.  prevents the bottom blowdown from backing into the feedwater lines

Neutral on the pH scale is ___________.
A.  0
B.  4
C.  7
D.  14

The Bourdon tube in a steam pressure gauge is protected by a _________________.
A.  steam trap
B.  siphon
C.  steam trainer
D.  stopcock

A dry pipe on a boiler ____________.
A.  removes moisture from steam
B.  supplies adequate makeup water
C.  maintains an NOWL
D.  is used in the event of a fire

When checking the water level in a steam boiler with try cocks a the NOWL_____________________.
A.  steam and water flow out of the middle try cock
B.  water flows out of the top try cock
C.  steam flows out of the bottom try cock
D.  steam and water flow out of the top try cock

In a reciprocating feedwater pump, the __________________
A.  water piston is larger than the steam piston
B.  water and steam piston are the same size
C.  steam piston is larger than the water piston
D.  steam valve has to be as large and the water valve

Scale on a watertube boiler can be removed by
A.  a steam lance
B.  a fire hose
C.  wire brushing
D.  hydraulic turbine cutters

The atomization of fuel oil in a rotary cup burner is cause by the ________________.
A.  rotating cup
B.  rotating cup and primary air
C.  pressure of the fuel oil
D.  secondary and primary air

A pyrometer measures _______________
A.  temperature
B.  steam pressure
C.  draft
D.  the quality of steam leaving the boiler

Staybolts are most commonly used in ______________ boilers.
A.  firetube
B.  watertube
C.  bent-tube
D.  cast iron sectional

A dry pipe _____________.
A.  removes moisture from the steam
B.  connects the dry drum to the steam and water drum
C.  increases water circulation
D.  acts as a receiver

A difficulty found when burning pulverized coal is _____________________.
A.  the formation of slag
B.  improper pulverization
C.  furnace design
D.  inability to meet steam load changes

Water conductivity is used to determine which specific impurities are contained in water.
A.  True
B.  False

Pretreatment of boiler water occurs inside a boiler.
A.  True
B.  False

Scale is teh collection of mineral deposits formed on the heating of surfaces of a boiler.
A.  True
B.  False

Bottom blowdown is more effective whit it is used during light loads.
A.  True
B.  False

Condensate will absorb oxygen and carbon dioxide as it cools.
A.  True
B.  False

A demineralizer replaces all the cations in the inlet water with hydrogen ions.
A.  True
B.  False

Continuous blowdown is more effective when it is  used during heavy steaming.
A.  True
B.  False

Boiler feedwater can be heated above 212 degrees in a vented heater
A.  True
B.  False

Disolved oxygen can be converted to fee oxygen in a dearator.
A.  True
B.  False

The three major types of dearators are the tray, spray, and combination.
A.  True
B.  False

A demineralizer is a highly efficient ion-exchange process generally used for low pressure boilers.
A.  True
B.  False

Permanent hardness of water may be reduced only by the use of chemicals or distillation.
A.  True
B.  False

Dispersants prevent solids in boiler water from sticking together to form deposits
A.  True
B.  False

Scale deposits are prevented from forming in boiler water by:
A.  converting scale-forming minerals to suspended solids
B.  dissolving scale forming minerals
C.  keeping scale-forming minerals out of the water
D.  removing scale-forming minerals with direct constant heating

Why is carbon dioxide gas disolved in boiler water dangerous to a modern steam boiler?
A.  because it forms carbonic acid
B.  because it breaks the magnetic iron oxide film inside the boiler tubes
C.  because it combines with sulfates to cause pitting
D.  because it combines with oxygen to cause scaleing of the tubes

The three basic classifications of impurities found in natural water are:
A.  dissolved solids, suspended gases, suspended solids
B.  suspened gases, suspended solids, dessolved gases
C.  dissoved solids, dissolved gases, suspended solid
D.  none of the above

An anion is an atom with a _________ electrical charge.
A.  positive
B.  neutral
C.  negative
D.  none of the above

What types of waterside deposits are removed by boiling out a boiler?
A.  corrosion deposits
B.  high temperature oxides
C.  oil and grease
D.  sludge

Excess oxygen present in the boiler water would be a direct indication of:
1.  air leakage into the condensate through turbine glands
2.  Improper operation of the dearating feedwater tank
A.  1 only
B.  2 only
C.  both 1 & 2
D.  Neither

Why do you add phosphates to the boiler water?
A.  reduces alkalinity
B.  forms harmless sludge from scale forming salts.
C.  reduces oxygen impingement
D.  forms a phosphate protection layer on all drum internals

Which of the most common gases which become dissolved in the boiler water will cause corrosion in the internals of the boiler?
A.  oxygen and CO
B.  oxygen and nitrogen
C.  oxygen and ammonia
D.  oxygen and CO2

Hardness of water is the measurement in ppm of _________ and __________ in the water.
A.  hydrogen and oxygen
B.  cations and anions
C.  calcium and magnesium
D.  none of the above

Which of the following best describes titration:
A.  a proceedure of neutralizing an unknown solution with a reagent of a known quantity
B.  The point at which amineization of the boiler water test sample occurs
C.  an indication of harness of the boiler
D.  a measure of the chloride content is a sample of boiler water 

What effect does temperature and pressure have on the activity of oxygen entrained in boiler feedwater?
A.  oxygen is more active with high pressure and temperature
B.  oxygen activity remains the same at high temperatures and pressures
C.  oxygen is less active with high pressure and temperature
D.  oxygen is more soluble at high temperatures and pressures

Entrained oxygen in feed-water entering the boilder would cause:
A.  caustic embrittlement
B.  honeycombing
C.  localized pitting
D.  erosion

A ________ amine is injected into a boiler during operation to raise the pH of the condensate.
A.  filming
B.  neutralizing
C.  ecological
D.  hydrazine

The conductivity of the mak-up water is 390 micromhos.  The conductiving fo the feedwater is  180 micromhos, and the conductivity of the condensate is 45 micromhos.  What is the percentage of condensate return?
A.  1.64
B.  60.9
C.  76.3
D.  80.6

_______________ is a condition in which a boiler metal becomes too brittle because of crystalline cracking.
A.  phenolphthalein alkalinity
B.  caustice solubility
C.  alkaline embrittlement
D.  caustic embrittlement

The order in which a sodium zeolite water softner regenerates is:
A.  rinse, backwash, brine
B.  rinse, brine, rinse
C.  backwash, brine, rinse
D.  backwash, brine, backwash

Silt an algae are examples of ____________ found as impuriteis in natural water.
A.  dissolved gases
B.  dissolved solids
C.  suspended solids
D.  suspended gases

Natural water generally has a pH of approimately _____ to _____.
A.  3.5 - 4.5
B.  4.5 - 5.5
C.  5.5 - 6.5
D.  6.5 - 7.5

Temporary hardness of water may be reduced by _______ the water.
A.  chilling
B.  heating
C.  aerating
D.  none of the above

The dry layup method is used for _________ boiler storage.
A.  24 hr
B.  short term
C.  long term
D.  none of the above

Two testing instruments used to determine the quantity of dissolved iron in a water sample are the color wheel comparator and the __________.
A.  titrator
B.  spectrophotometer
C.  ion exchanger
D.  demineralizer

Scale-forming impurities become concentrated in the boiler water by ______________.
A.  solidfication as the water temperature increases
B.  evaporation as the water boils off
C.  Both A & B
D.  Neither

Accepted boiler water treatment involves repeated blowdown, adding chelants to form soluble sludges from magnesium, calcium and iron preventing corrosion and adding:
A.  calcium sulfate to reduce foaming
B.  sodium sulfite to remove oxygen
C.  sodium chloride to prevent sludge
D.  soda ash to decrease the alkalinity

A ___________ test is a test that determines the concentration of a specific dissolved substance.
A.  reverse osmosis
B.  conductivity
C.  residual
D.  titration

What is the conversion factor for converting grains per gallon to parts per million?
A.  .491
B.  7.2
C.  17.1
D.  32.8

Where is sludge most likely to be formed?
A.  downcomers
B.  floor tubes
C.  risers
D.  generating tubes

Which of the following minerals or mineral compounds dissolve in boiler water and form hard scale on the interior of the boilder tubes?
A.  calcium and magnesium
B.  magnesium and carbonate
C.  carbonate and sulfate
D.  sulfate and silica

As water is heated, the solubility of oxygen ____________.
A.  increases
B.  decreases
C.  remains constant
D.  increases until the boiling point is reached, than decreases

Where does dissolved CO2 in the boilder feedwater cause corrosion?
A.  condensate system
B.  superheater tubes
C.  boiler tubes
D.  desuperheater tubes

The end point in titrating a boiler water sample is the point at which"
A.  the buret reads zero
B.  titration stops
C.  the sample is neutral
D.  the sample becomes saturated

A commonly used chemical oxygen scavenger is ________________.

Cycles of _____________ measure the concentration of the solids in the boilder water compared to the concentration of the solids in the feedwater.

High ________ in boiler water contributes to the formation of CO2.

________ keeps the hardness in boiler water in solution so that it cannot settle out on the heating surfaces.

____________ causes hardness particles in boiler water to precipitate as heavy sludge that is removed through the bottom blow.

A ____________ is a chemical used in water treatment teste to show the presence of a particular substance.