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Electrical Lighting and Illumination MCQs

Electrical light is a device that produces light from electrical power. Electric lights are often categorized into three main categories: Incandescent lamps, Gas discharge lamps and LED lamps. Illuminance is defined as the measurement of the amount of light falling onto (illuminating) and spreading over a given surface area. SI unit for illuminance is lux (lx). Given below are top 10 MCQs on electrical lighting and illumination mcqs.

Luminous intensity is measured in

Luminous intensity is measured in:

  1. Kelvin
  2. Candelas
  3. Illumine
  4. Degrees

Correct answer 2. Candelas

One lumen equals

One lumen equals

  1. one candela-steradian
  2. two candela-steradian
  3. three candela-steradian
  4. four candela-steradian

Correct answer: 1. one candela-steradian

The quantity of light emitted by a source is

The quantity of light emitted by a source is:

  1. candelas
  2. luminous flux
  3. foot-candle
  4. None of above

Correct answer: 2. luminous flux

Sunlight at the earth’s surface has a color temperature ranging between

Sunlight at the earth’s surface has a color temperature ranging between:

  1. 2200 K and 3500 K
  2. 3500 K and 5500 K
  3. 5500 K and 6500 K
  4. Above 6500 K

Correct answer: 3. 5500 K and 6500 K

The temperature of a blackbody source that would emit light of that given wavelength is given the name

The temperature of a blackbody source that would emit light of that given wavelength is given the name:

  1. candelas
  2. luminous flux
  3. Color temperature
  4. All of above

Correct answer: 3. Color temperature

Lighting system color temperature is measured in

Lighting system color temperature is measured in:

  1. Kelvin
  2. Candelas
  3. Illumine
  4. Degrees

Correct answer: 1. Kelvin

Warm color in lighting systems refers to

Warm color in lighting systems refers to:

  1. 2700–3300 K
  2. 3300–4000 K
  3. 4000–5000 K
  4. 5000–6500 K

Correct answer: 1. 2700–3300 K

Cool color in lighting systems refers to

Warm color in lighting systems refers to:

  1. 2700–3300 K
  2. 3300–4000 K
  3. 4000–5000 K
  4. 5000–6500 K

Correct answer: 4. 5000–6500 K

The measure of the efficiency of producing visible light is best described as

The measure of the efficiency of producing visible light is best described as:

  1. Kelvin
  2. Candelas
  3. Efficacy
  4. Degrees

Correct answer: 3. Efficacy

The function of ballast in the fluorescent lamp is to

The function of ballast in the florescent lamp is to

  1. Control voltage for starting
  2. Current limitation
  3. Both of these
  4. None of these

Correct answer: 3. Both of these

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