ILLUMINATION - Practice Mode

1) What is the S.I unit of luminous intensity?

Lux Lumen Candela Steradian

Correct Answer: Candela

Explanation:

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2) What is the working temperature of filament lamp?

1500 Degree Centigrade 1800 Degree Centigrade 2000 Degree Centigrade 2300 Degree Centigrade

Correct Answer: 2300 Degree Centigrade

3) Which material is coated in tungsten electrode of a fluorescent tube lamp?

Silver oxide Phosphor powder Fluorescent powder Barium and stroatium oxide

Correct Answer: Barium and stroatium oxide

4) Which position MB type high pressure mercury vapour lamps are operated?

Vertical Inclined Horizontal Any position

Correct Answer: Any position

5) What is the function of leak transformer in high pressure sodium vapour lamp circuit?

Reduce the starting current Reduce the working voltage Increase the working voltage Ignite the high voltage initially

Correct Answer: Ignite the high voltage initially

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