electrical

Illumination MCQ Questions and Answers Page - 1

1.

Which of the following statements is correct?

Answer/ Hint      

Answer : D

Explanation :

2.

Luminous efficiency of a fluorescent tube is

Answer/ Hint      

Answer : D

Explanation :

3.

Candela is the unit of which of the following?

Answer/ Hint      

Answer : B

Explanation :

4.

Colour of light depends upon

Answer/ Hint      

Answer : C

Explanation :

5.

Illumination of one lumen per sq. meter is called ____________

Answer/ Hint      

Answer : B

Explanation :

6.

A solid angle is expressed in terms of ____________

Answer/ Hint      

Answer : C

Explanation :

7.

The unit of luminous flux is ___________

Answer/ Hint      

Answer : B

Explanation :

8.

Filament lamps operate normally at a power factor of

Answer/ Hint      

Answer : C

Explanation :

9.

The filament of a GLS lamps is made of

Answer/ Hint      

Answer : A

Explanation :

10.

Fine diameter tungsten wires are made by

Answer/ Hint      

Answer : D

Explanation :

11.

What percentage of the input energy is radiated by filament lamps?

Answer/ Hint      

Answer : B

Explanation :

12.

Which of the following lamps is the cheapest for the same wattage?

Answer/ Hint      

Answer : C

Explanation :

13.

Which of the following is not the standard rating of GLS lamps?

Answer/ Hint      

Answer : B

Explanation :

14.

In house the illumination is in the range of

Answer/ Hint      

Answer : D

Explanation :

15.

“The illumination is directly proportional to the cosine of the angle made by the normal to the illuminated surface with the direction of the incident flux”.

Above statement is associated with

Answer/ Hint      

Answer : A

Explanation :

16.

The colour of sodium vapour discharge lamp is

Answer/ Hint      

Answer : C

Explanation :

17.

Carbon arc lamps are commonly used in

Answer/ Hint      

Answer : B

Explanation :

18.

Desired illumination level on the working plane depends upon

Answer/ Hint      

Answer : D

Explanation :

19.

On which of the following factors does the depreciation or maintenance factor depend?

Answer/ Hint      

Answer : D

Explanation :

20.

In lighting installation using filament lamps 1% voltage drop results into

Answer/ Hint      

Answer : C

Explanation :

21.

For the same lumen output, the running cost of the fluorescent lamp is

Answer/ Hint      

Answer : B

Explanation :

22.

For the same power output

Answer/ Hint      

Answer : B

Explanation :

23.

The cast of a fluorescent lamp is more than that of incandescent lamp because of which of the following factors?

Answer/ Hint      

Answer : D

Explanation :

24.

Filament lamp at starting will take current

Answer/ Hint      

Answer : C

Explanation :

25.

A reflector is provided to

Answer/ Hint      

Answer : D

Explanation :

26.

The purpose of coating the fluorescent tube from inside with white power is

Answer/ Hint      

Answer : D

Explanation :

27.

_____________   will need lowest level of illumination.

Answer/ Hint      

Answer : B

Explanation :

28.

Due to moonlight, illumination is nearly

Answer/ Hint      

Answer : D

Explanation :

29.

Which of the following instrument is used for the comparison of candle powers of different sources?

Answer/ Hint      

Answer : D

Explanation :

30.

_____________ photometer is used for comparing the lights of different colours?

Answer/ Hint      

Answer : D

Explanation :

31.

In the fluorescent tube circuit, the function of choke is primarily to

Answer/ Hint      

Answer : C

Explanation :

32.

_____________ cannot sustain much voltage fluctuations.

Answer/ Hint      

Answer : C

Explanation :

33.

The function of capacitor across the supply to the fluorescent tube is primarily to

Answer/ Hint      

Answer : C

Explanation :

34.

_____________   does not have separate choke

Answer/ Hint      

Answer : A

Explanation :

35.

In sodium vapour lamp the function of the leak transformer is

Answer/ Hint      

Answer : C

Explanation :

36.

Most affected parameter of a filament lamp due to voltage change is

Answer/ Hint      

Answer : B

Explanation :

37.

In electric discharge lamps for stabilizing the arc

Answer/ Hint      

Answer : A

Explanation :

38.

For precision work the illumination level required is of the order of

Answer/ Hint      

Answer : A

Explanation :

39.

____________  is a cold cathode lamp.

Answer/ Hint      

Answer : B

Explanation :

40.

In case of _____________ least illumination level is required.

Answer/ Hint      

Answer : C

Explanation :

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Illumination MCQ Questions and Answers Page - 1