ONLINE MCQ EE-ILLUMINATION 5
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Attempt Free ONLINE MCQ EE-ILLUMINATION 5 Here. Read The Important Electrical MCQ From Below.
Q41. The unit of luminous flux is
A. watt/m2
B. lumen
C. lumen/m2
D. watt
Ans. B
Q42. The colour of sodium vapour discharge lamp is
A. red
B. pink
C. yellow
D. bluish green
Ans. C
ONLINE MCQ EE-ILLUMINATION 5
Q43. A reflector is provided to
A. protect the lamp
B. provide better illumination
C. avoid glare
D. do all of the above
Ans. D
Q44. ____ does not have separate choke
A. Sodium vapour lamp
B. Fluorescent lamp
C. Mercury vapour lamp
D. All of the above
Ans. A
Q45. A substance which change its electrical resistance when illuminated by light is called
A. photoelectric
B. photovoltaic
C. phatoconductive
D. none of the above
Ans. C
ONLINE MCQ EE-ILLUMINATION 5
Q46. Luminous flux is
A. the light energy radiated by sun
B. the part of light energy, radiated by sun, which is received on the earth
C. the rate of energy radiation in the form of light waves
D. none of the above
Ans. C
Q47. Sky appears blue because of
A. refraction
B. reflection
C. radiation
D. scattering of light over dust particles
Ans. D
Q48. The level of illumination on a surface least depends on
A. ambient temperature
B. candle power of the source
C. distance of the source
D. type of reflector used
Ans. A
Q49. Filament lamps operate normally at a power factor of
A. 0.5 lagging
B. 0.8 lagging
C. unity
D. 0.8 leading
Ans. C
ONLINE MCQ EE-ILLUMINATION 5
Q50. Carbon arc lamps are commonly used in
A. photography
B. cinema projectors
C. domestic lighting
D. street lighting
Ans. B
