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Multiple Choice Question (MCQ) of Illumination page-3


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21. The capacitor used in auto transformer circuit for sodium vapour lamps, is for

A) protection against accidental power failure
B) controlling illumination level of the lamp
C) for regulating discharge voltage
D) for improving the power factor of the circuit.

Ans : (D)


22. A mercury vapour lamp gives

A) pink light
B) yellow light
C) greenish blue light
D) white light.

Ans : (C)


23. Lumen/watt is the unit of

A) Luminous efficiency
B) Brightness
C) Luminous intensity
D) Light flux.

Ans : (A)


24. Candela is the unit for

A) Light flux
B) Brightness
C) Luminous intensity
D) Luminous efficiency.

Ans : (C)


25. Under the influence of fluorescent lamps sometimes the wheels of rotating machinery appear to be stationary. This is due to the

A) low power factor
B) stroboscopic effect
C) luminescence effect
D) fluctuations.

Ans : (B)


26. Power factor is highest in case of

A) Mercury arc lamp
B) Sodium vapour lamps
C) Tube lights
D) GLS lamps.

Ans : (D)


27. Which of the following electric discharge lamp gives highest lumens/watt

A) Neon lamp
B) Sodium vapour lamp
C) Mercury lamp at low pressure
D) Mercury vapour at high pressure.

Ans : (B)


28. Which gas is sometimes used in filament lamps ?

A) Carbon dioxide
B) Nitrogen
C) Krypton
D) Argon.

Ans : (D)


29. Which bulb operates on lowest power ?

A) Torch bulb
B) GLS bulb
C) Neon bulb
D) Night bulb.

Ans : (A)


30. The output of a tungsten filament lamp depends on

A) size of lamp
B) size of shell
C) temperature of filament
D) all of the above.

Ans : (C)



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