-
During soldering, apply the proper amount of solder directly to the
connection
-
How should you remove a component from a printed circuit board?
Vacuum Desoldering
-
Which choice best describes a good solder connection?
No pits or holes and has a good concave fillet.
-
When making wire connections to turret terminals, wrap the wire around the terminal at least
180 degrees
-
To connect wires or compnent leads to flat perforated terminals, the wrap must be
180 degrees
-
What is the heaviest duty solding iron you normally use in soldering a printed circuit board?
27 watts
-
You should clean the circuit board connection within how long after it has cooled?
90 minutes
-
How should a clinched-lead terminal lay in respect to the printed circuit pad?
Flat on the pad and in the direction of the printed circuit wiring pattern.
-
How should you hold a printed circuit board to desolder a component?
vertically
-
What must you do before soldering gold-plated integrated circuit leads?
Remove their gold plating
-
To clean tinned, lead-plated circuit boards use
a medium-bristle brush and alcohol
-
When soldering a module-type package to a printed circuit board, ensure the connection is soldered within
5 seconds
-
You must repair a circuit board condutor if it has a knick that extends what part of it's width?
25 percent
-
What angle is used to trim out damaged foil areas of printed circuit boards?
45 degrees
-
When repairing a damaged terminal on a circuit board, the replacement foil should overlap the connecting circuit conductor by at least
0.125 inches
-
What is an acceptable substitue for silver solder flux?
Borax and Water
-
When soldering a brass fitting to copper tubing, how far should the inner cone of the torch flame be kept from the work?
At least on-half of an inch
-
How many BTUs does it take to raise the temperature of 5lbs. of water 5 degrees Farenheight?
25
-
If an aircraft temp. indicator shows 40 degrees C, what is the equivalent Farenheit temp?
104 degrees
-
What happens when gas is trapped in a cylinder and pressure is applied to the piston?
Volume will decrease
-
When a gas is heated, its pressure will
Increase.
-
What is a true statement concerning a permanent magnet?
It keeps it's magnetism
-
Which of the following is a good insulator?
Glass
-
The intensity of electrical current flow is measured in
Amperes
-
What is the total current in a series that has a applied voltage of 24volts and a total resistance of 8ohms?
3 amperes
-
The basic function of electricity is to
transfer energey
-
In a series circuit, when 24 volts is applied and total resistance is 6 ohms, what is the amperage?
4 amps
-
The total resistance is a parrallel circuit is always
less than the smallest resistance in the circuit
-
The rule that indicates the direction a current-carrying conductor will move in a magnetic field is the
Right-hand rule for motors
-
What is the effective electromotive force (EMF) in a motor?
The applied voltage minus CEMF
-
In a circuit with both coils and capacitors, voltage and current will be
out of phase
-
AC generators operate on the principle of
Induction
-
One disadvantage of the electrolytic capacitor is that
it has a high-power loss
-
Transformers in low-frequency circuits require a
core of low-reluctance magnetic material
-
The extent to which the primary's magnetic lines cut across the secondary is expressed as
coefficient of coupling
-
AC power is connected directly to what part of an induction motor?
Stator
-
The current in a two-phase induction motor is
90 degrees out of phase
-
The difference between the speed of the stator's rotating magnetic field and the rotor is called
slip
-
Which of the following is a true statement concerning normal operation of a transistor?
The collector-base junction is reverse biased
-
How does the movement of majority carriers in a PNP transistor compare with that in an NPN?
They move from emitter to collector in both types
-
What is the difference between the PNP and NPN transistor symbols?
The direction of the arrow on the emitter lead
-
Which transistor amplifier configurations have their signal voltages in phase?
Common base and common collector
-
What half-wave rectifier component limits the peak current?
Resistor
-
The full-wave rectifier is used in
low-voltage and high-voltage circuits
-
In an electronic voltage regulator, the series transistor acts like a
variable resistor
-
What do most logic circuits use to define the input or output condidtion?
Voltage polarity
-
To obtain a high output, the inputs to an AND gate must be
high
-
Which logic gate has a high output when all inputs are low?
NOR
-
What unit is used as a circuit-controlling device?
Switch
-
If you're troubleshooting a parallel circuit with one leg open, an ammeter connected in series with the whole circuit gives what kind of amperage reading?
Low
-
What would the ohmmeter read for a shorted component in a seres-parallel circuit?
Lower than normal or zero
-
The voltmeter indicates voltage, but it actually measures
current
-
In measuring an unknown voltage with a voltmeter, what range should you use first?
highest meter range
-
If your ohmmeter won't adjust to zero when you're ready to use it, you should
change the battery
-
An ohmmeter indicated an open circuit when it reads
infinity
-
How do you connect an ammeter in a circuit?
series
-
The AN/USM-33 multimeter uses crystal diodes to change
AC voltage to DC current
-
Before taking the first current measurement, you shoul set the range select swith on the
0 to 600 range
-
The AN/PSM-33 multimeter indicator has how many range scales?
Three
-
What should you do to change the AN/PSM-37 meter's range or functin switch without removing the test leads from the circuit?
Push in the push-to-open-and-reset control
-
To measure circuit current, you connect an AN/PSM-37 multimeter in
series in the circuit
-
Use the range button on the Fluke multimeter to
move the decimal point
-
On the Fluke multlimeter, what does it mean when the H symbol is shown on the meter display?
Touch-hold mode is in use
-
When measuring resistance with the Fluke multimeter, what does the letters OL on the display indicate?
Infinity
-
The thermoswith tester can check switches with a farneheit range or
200 to 1000 degrees
-
When do you turn the anti skid tester Power switch on?
Just after you turn on the aircraft power
-
What is the maximum current output of the igniter circuit tester?
5.5 milliamperes
-
You should perform an preoperational check of the igniter circuit tester at least
prior to each day's use
-
What does each unit in the test stand incorporate for safety during maintenance?
Power disconnect switch
-
What must be done to apply a reactive load to a generator under test?
Load a power factor
-
If a circuit has two equal resistors connected in series, a voltmeter connected across an open resistor will read
applied voltage
-
You would troubleshoot a 28VDC circuit for a blown fuse (short) with a/an
Ohmmeter
-
In checking for a shorted relay in a parallel circuit, you must
isolate the component
-
Which of the following statements is true concerning ni-cad batteries and lead-acid batteries?
They must be stored and charged in seperate areas
-
The greatest hazard in working around a lead-acid battery is
sulfuric acid
-
The neutralizing agent for sulfuric acid is
bicarbonate of soda
-
Lead-acid batteries and Ni-cad batteries are stored and charged in seperate areas because accidentally mixing the electrolytes could
neutralize the electrolytes, causing excessive heat, and the battery might explode
-
How many cells does a 24V lead-acid battery have?
12
-
The number of cells in a normal Ni-cad battery for a 24V aircraft system is
19
-
A ni-cad battery's seperators are made of nylon and cellophane or
permion
-
A fully charged battery should have a specific gravity reading of
1.275 to 1.300
-
What do you use to adjust a lead-acid battery's electrolyte level?
self-leveling syringe
-
Constant-Current charging keeps the current at a value that is predetermined by the
manufacturer
-
In an equalized NI-Cad battery, each cell's voltage is
0 volts
-
Pitting corrosion of aluminum or magnesium alloy first appears as
white powdery deposit on the metal surface
-
All metal components of your systems should get a comprehensive inspection for corrosion
during all inspections
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