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Lighting SAIT Electrician > 1Installation of Lighting Equipment > Flashcards

1Installation of Lighting Equipment Flashcards

1
Q

What is the wavelength range of visible light?

What is the colour associated with the longest wavelength of this range?

A

400-700 nanometers

Red

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2
Q

What is a correlated colour temperature?

What are two common values & associated “colours”?

A

Value to give an idea of the colour of light produced.

  • 5100K cool white (bluish)
  • 2700K warm white (yellow/orange)
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3
Q

What is candela?

A

Measure of the brightness of a light source. Approximately the amount of light from one candle.

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4
Q

Don’t use this card. There is another card for Lumens.

What is a lumen?

A

Don’t use this card.

The quantity of light. Candela/second

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5
Q

What is lux?

A

Amount of illumination on an area. Lumens/meter2

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6
Q

What is efficacy?

A

How “efficient” a light is. Lumens/watt

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7
Q

What are three electric lighting sources?

A
  • Incandescent
  • Electric discharge lighting
  • Light emitting diode
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8
Q

How do fluorescent lamps work?

A

Electric current is passed through a mercury vapour which produces an ultraviolet light, causing the phosphor coated tube to glow.

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9
Q

Approximately what percentage of energy in an incandescent lamp is produced as heat?

A

88%

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10
Q

What is a halogen lamp’s bulb made of?

A

Quartz

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11
Q

Do compact fluorescent lamps require a separate ballast?

A

Only if “non-integrated”

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12
Q

What is the filament material in a standard incandescent lamp?

A

Tungsten

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13
Q

What is the major downside to using LED lamps?

A

Price.

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14
Q

What is the difference between a lamp and a luminaire?

A

A lamp is the bulb or source of light and a luminaire is a lighting fixture.

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15
Q

What is the purpose of a ballast?

A

To create an arc to start a lamp and to limit current flow through a lamp.

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16
Q

What is the maximum current allowed for a lighting circuit in a single dwelling?

A

15 amperes.

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17
Q

What is a colour rendering index? (CRI)

A

A value which gives an indication of how well a light source reproduces the actual colours of an object.

100 is ideal.

18
Q

In emergency lighting systems, the voltage drop shall not exceed 3% of the marked unit equipment. T or F?

A

False, it cannot exceed 5%

19
Q

Emergency lighting equipment cannot be solely battery powered if the marked input rating exceeds _____ amperage or _____ voltage.

A

24 Amps
250 Volts
If it exceeds these values the unit equipment must be permanently connected

20
Q

In dwelling unit branch circuits, what is the maximum volts-to-ground?

A

150

21
Q

Which wavelength cannot be seen, but can be felt as heat?
A) Infrared
B) Ultraviolet
C) Fluorescent green
D) Bright blue

A

Infrared

22
Q

In what two locations can emergency lighting circuits be ran with other wiring/equipment?

A

In transfer switches and emergency lighting supplied by two sources

23
Q

What two types of ballasts are used for fluorescent lamps?

A

Magnetic and Electronic

24
Q

Which visible colour has the shortest wavelength?

A

Violet (400nm)

25
Q

On the Kelvin scale, room temperature would be about how many °K?

A

300°K

26
Q

Daylight at noon has a correlated colour temperature (CCT) of approximately ______°K

A

5500°K

27
Q

How is efficacy measured?

A

In Lumens per Watt.

Incandescents have an Efficacy of approximately 18 lm/W

28
Q

If a light source that requires 50W produces 10,000 lumens, what is the efficacy of the source?

A

200 lm/W

29
Q

What is the melting point of Tungsten?

A

3410 °C

30
Q

Why is Tungsten used as a filament material?

A

Tungsten has a high melting point (3410 °C) and a slow rate of evaporation

31
Q

What is the inert gas in some low wattage incandescent lamps?

A

Argon/Nitrogen mix

or a more expensive

Krypton/Nitrogen mix

32
Q

What does the T in a T8 or T12 florescent lamp stand for?

A

Tubular

33
Q

What coats inside of the glass in a fluorescent lamp?

A

Phosphors

34
Q

True or False?
Halogen lamps output a whiter and less Orange light than incandescents.

A

True.

35
Q

What are the basic types of fluorescent lamps?

A

Linear and compact

36
Q

What are the advantages of an electronic ballast over a magnetic one?

A

Smaller
Lighter
More efficient
Less flicker
Produce less heat
Improve power factor
Reduce harmonic distortion

37
Q

Why are electronic ballasts more efficient and have less flickering than magnetic ballasts?

A

Electronic ballasts increase the operating frequency of the lamp to 20kHz or more; magnetic ballasts output frequency is 60 Hz

38
Q

Magnetic ballasts have a sound rating designated by which letters?

A

Letters A to F

A producing the least hum. (Homes, offfices)

F producing the greatest hum.
(Streetlights, Factories)

39
Q

A unit of luminous intensity is called a ______?

A

Candela

40
Q

A unit of measurement of the quantity of light emitted by a light source is called?

A

A Lumen

41
Q

The unit of measure for colour temperature is known as?

A

The Kelvin

Lighting SAIT Electrician (1 decks)

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