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4th Year Electrical - Code > Lighting, Emergency Systems And Unit Equipment > Flashcards

Lighting, Emergency Systems And Unit Equipment Flashcards

1
Q

What range of electromagnetic wavelengths makes up visible light?

A

400 to 700 nanometers (nm)

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2
Q

How is the colour of light related to temperature?

A

The hotter the temperature of a blackbody is, the shorter the wavelength of light it gives off.

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3
Q

Red is the (highest/lowest) temperature with the (longest/shortest) wavelength.

A

Lowest ; Longest

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4
Q

Violet is the (highest/lowest) temperature with the (longest/shortest) wavelength.

A

Highest ; Shortest

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5
Q

What unit describes the brightness of a light source?

A

Candela

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6
Q

What does a lumen measure?

A

Quantity of light a source produces

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7
Q

If 200 lumens fall on an area of 5 metres square, what is the illumination of this area in lux?

A

40 lx

200 lm / 5m^2 = 40 lx

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8
Q

If a light source that requires 250W produces 21500 lumens, what is the efficacy of the source?

A

86 lm/w

21500 lm / 250W = 86 lm/W

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9
Q

What material is used to make the filament of an incandescent lamp?

a) gold
b) titanium
c) iron
d) tungsten

A

d) tungsten

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10
Q

What material is used to make the enclosure for the filament of a halogen lamp?

a) glass
b) acrylic
c) quartz
d) halogen

A

c) quartz

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11
Q

What is the composition of the coating in the tube of a fluorescent lamp?

a) phosphor
b) fluoresce
c) xanthium
d) halogen

A

a) phosphor

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12
Q

What are the two basic types of fluorescent lamps?

A

Linear and Compact

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13
Q

What is different about the frequency of electronic ballasts compared to magnetic ones?

A

Electronic ballasts have a higher frequency than the standard 60 Hz of a magnetic ballast

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14
Q

Which type of lamp is a metal-halide?

A

HID

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15
Q

What does LED stand for in the lighting industry?

A

Light emitting diode

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16
Q

How many 8ths of an inch is the diameter of a F28 T5/841 lamp?

A

5/8

17
Q

Which type of lamp would you expect this to be?

MH1500/BU

A

Metal Halide

18
Q

Which type of lamp would you expect this to be?

H37 KB-250

A

Mercury vapor

19
Q

Which ANSI ballast is indicated by the following label?

C70S62/D/M

A

S62

20
Q

Which ANSI ballast is indicated by the following label?

H44GS100

A

H44

21
Q

What does halogen do in an incandescent lamp?

A

It helps redeposit the tungsten back onto the filament for longer life

22
Q

What does the blackening on one end of a rapid start lamp indicate even if the lamp has only been on a short length of time?

A

It indicates a poor or loose connection and that the electrode is not receiving heating current

23
Q

What does the cycling of a LPS lamp indicate?

A

The lamp should be replaced

24
Q

What, besides a burnt out lamp, does a lamps failure to start indicate?

A

A bad ballast

25
Q

What are the two (2) main ways of restricting lamp changeability?

A
  • Lamp base or pin type

- Warning labels

26
Q

What is the effect of replacing a lamp with another lamp that has the same electrical requirements, but different CCT?

A

Colour enhancement would change, so retail products may not appear as they should

27
Q

What is the maximum allowable branch circuit voltage-to-ground for a circuit in a dwelling unit?

A

150V

28
Q

What are the two (2) switching restrictions for luminaries located near combustible material?

A
  • luminaries of the un-switched type

- luminaries controlled by a wall switch

29
Q

What precautions must be observed when installing a rigid luminaire within 2.1 m of the floor?

A

It must be protected from mechanical injury by guard or by location

30
Q

In a dwelling unit, a main floor stairway with four risers must have a luminaire controlled by 3-way switches located at the head and foot of the stairway.

True or False

A

True

31
Q

What is the maximum allowable weight of a ceiling luminaire that is supported directly by an outlet box mounted on a bar hanger?

A

23 kg

30-302

32
Q

What is the minimum distance a recessed NON-IC luminaire enclosure must be away from a combustible material?

A

13 mm

33
Q

Which conductor must be attached to the screw shell of a lampholder?

A

The identified conductor

4th Year Electrical - Code (3 decks)

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