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Multiple Choice Question (MCQ) of Illumination page-6


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51. A 60 W lamp given a luminous flux of 1500 lumen. Its efficiency is

A) 2.5 lumen/watt
B) 25 lumen/watt
C) 250 lumen/watt
D) 1500 lumen/watt.

Ans : (B)


52. One lux is the same as

A) one lumen/sq.m
B) one lumen/sq.cm
C) one lumen/100 sq.m
D) one lumen/1000 sq.m.

Ans : (A)


53. The vacuum inside an incandescent lamp is of the order of

A) 10-2 mm Hg
B) 10-3 mm Hg
C) 10-4 mm Hg
D) 10-5 mm Hg

Ans : (C)


54. Which of the following application does not need ultraviolet lamps ?

A) Blue print machines
B) Car lighting
C) Aircraft cockpit dashboard lighting
D) Medical purposes.

Ans : (B)


55. Meat from the filament of a lamp is transmitted to the surrounding mainly through

A) conduction
B) convection
C) radiation
D) none of above.

Ans : (C)


56. In a fluorescent tube circuit, choke acts as

A) starter
B) power factor improving device
C) source of heat
D) current limiting device.

Ans : (D)


57. When a fluorescent lamp is to be operated on dc which of the following additional device must be incorporated in the circuit ?

A) Inductance
B) Resistance
C) Transformer
D) Condenser.

Ans : (B)


58. When using ultra-violet lamps the reflector for maximum should be made of

A) glass
B) leaf
C) copper
D) aluminium.

Ans : (D)


59. Which of the following combination of gas-filled in a lamp and the resulting colour is incorrect ?

A) Neon-red
B) Magnesium-white
C) Carbon dioxide-day light white
D) Nitrogen-buff.

Ans : (B)


60. For same rating the amount of radiant heat produced in which of the following lamp is the least ?

A) Fluorescent lamp
B) Filament lamp
C) Sodium vapour lamp
D) Mercury vapour lamp.

Ans : (A)



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