CDC 3E051B: Volume 1. Lighting Systems (PART 1)

1. (001) Light fixtures are classified by...

A) the way they are installed
B) their size and weight
C) their width and length
D) the way they distribute light.

(001) Which light classification directs from 40 to 60 percent of its light upward above the area to be lighted?

A) Semi-indirect
B) Indirect
C) Semidirect
D) General diffusing

(001) Which classification of light fixture directs all its light so that the entire ceiling and upper side walls become the light source?

A) Indirect
B) General diffusing
C) Semi-indirect
D) Semidirect

(001) What is the unit of measurement for lumens per square meter?

A) Foot-candle
B) Lux
C) Meter-candle
D) Candlepower

(001) The efficiency range of a lamp is measured in lumens per...

A) ohm
B) watt
C) volt
D) amp

(002) Incandescent lamps have efficiencies ranging from...

A) 1 to 6 lumens per Watt
B) 6 to 24 lumens per Watt
C) 60 to 240 lumens per Watt
D) 24 to 60 lumens per Watt

(002) What is the diameter of a T8 lamp?

A) 8/16 inch
B) 8/8 inch
C) 8/2 inch
D) 8/4 inch

(002) What frequency should you expect to find in electronic ballasts used in fluorescent lighting systems?

A) 400 to 600 Hz.
B) 25,000 to 40,000 Hz.
C) 120 to 208 hertz(Hz)
D) 2,400 to 4,160 Hz.

(002) What is used to power a lighting emitting diode(LED) array in a non-integrating LED fixture?

A) LED driver.
B) LED transformer.
C) LED starter.
D) LED ballast.

(003) What is a disadvantage of high-intensity discharge(HID) lamps?

A) Lamp life is short.
B) Restrike time
C) Lamp size is large
D) Low lumen per watt output.

(003) What are the voltages that the 150-watt high pressure sodium(HPS) lamp comes in?

A) 55 and 220 volts.
B) 120 and 277 volts.
C) 55 and 100 volts.
D) 100 and 480 volts.

(003) What color is associated with high-pressure sodium(HPS) lamps?

A) Golden
B) Green-blue
C) Blue-white
D) Violet

(004) Which type of fixture is installed by laying it into the grid of a suspended ceiling?

A) Troffer
B) Wall mount
C) Flush mount
D) Surface mount

(004) When installing an octagon box for a new flush mount fixture, what is important to secure that the mounting method does not fail?

A) The fixture is less than 10 pounds.
B) Box is sized to support the fixture.
C) Fixture is secured using sheetrock screws.
D) Fill capacity of the box to allow enough space for connections.

(005) What are two types of phase cut dimmers?

A) Analog and digital.
B) Single pole and double pole.
C) Positive and negative.
D) Forward and reverse.

(005) How does a phase cut dimmer operate?

A) Two or more resistors are used to forma voltage divider. c. The root mean square(RMS) voltage is reduced by turning off a portion of the input waveform.
B) A variable resistor is used to lower the voltage.
C) Semiconductor switches are used to turn off only the negative portion of the input waveform.
D) The root mean square(RMS) voltage is reduced by turning off a portion of the input waveform.

(005) What is the light output of a fixture using a 0-10V ballast with a 10 volts on the low voltage control circuit?

A) 100%
B) 10%
C) 80%
D) 50%

(006) What type of light fixture is typically used to illuminate aircraft on the parking apron?

A) 150W Cobra Head.
B) 500-watt (W) floodlight.
C) Low-pressure sodium (LPS) light fixture.
D) 1000W-1500W high intensity discharge (HID) floodlight.

(006) In an incandescent lamp, how much consumed energy is lost in the form of heat?

A) 90%
B) 75%
C) 50%
D) 10%

(006) What device is used in high-intensity discharge (HID) lamps to limit current as the lamp heats up?

A) Ballast
B) Capacitor
C) Inductor
D) Resistor

(006) What letter represents the American National Standards Institute's special designation code for high-pressure sodium(HPS) lamps?

A) H
B) S
C) L
D) M

(007) When installing fixtures, ensure uniform lighting by...

A) adjusting fixtures to 5 degrees from horizontal.
B) using only mercury vapor fixtures.
C) using only high-pressure sodium fixture.
D) adjusting fixtures so that illuminated areas overlap

(007) To ensure that the proper amount of light is provided after fixture installation, check the lighting with...

A) a light meter
B) a stake
C) an ohmmeter
D) a voltmeter

(007) When troubleshooting a 120-volt photocell, which conductor should provide power to the light fixture?

A) Line (black)
B) Neutral (white)
C) None of the above
D) Load (red)

(007) To prevent injury during re-lamping procedures, you must...

A) wear leather gloves
B) de-energize the light fixture.
C) wear approved safety goggles.
D) do all of the above tasks