Question 1 of 22

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

Lux

Steradian

Candela

Lumen

Question 1 of 22

Question 2 of 22

2. Why is the outer tube of high pressure metal halide lamp made of borosilicate glass?

Increase lighting effect

Withstand atmospheric pressure

Withstand high temperature

Reduce UV radiation

Question 2 of 22

Question 3 of 22

3. Which device provides ignition voltage and acts as choke in HPSV lamps?

Arc tube

High pressure aluminum oxide

Sodium vapor

Leak transformer

Question 3 of 22

Question 4 of 22

4. What type of reflector is this?

Mirror type

Parabolic type

Soft light type

Dispersive type

Question 4 of 22

Question 5 of 22

5. What type of lamp is this?

MB type HPMV lamp

MA type HPMV lamp

MAT type MV lamp

HP metal halide lamp

Question 5 of 22

Question 6 of 22

6. Which term refers to light flow on a plane surface?

Illuminance

Luminous intensity

Lumen

Luminous flux

Question 6 of 22

Question 7 of 22

7. How is stroboscopic effect reduced in industrial twin tube light fittings?

Two capacitors in series (one per tube)

Capacitor in series with supply

Capacitor parallel to supply

Capacitor in series with one tube

Question 7 of 22

Question 8 of 22

8. What is this type of light called?

Bulk light

Flood light

Spotlight

Flash light

Question 8 of 22

Question 9 of 22

9. How is evaporation rate reduced in vacuum bulbs?

Increasing filament resistance

Producing arc in bulb

Filling with inert gas

Reducing filament resistance

Question 9 of 22

Question 10 of 22

10. What term refers to luminous flux per unit solid angle from a light source?

Lumen

Luminous intensity

Candela

Illuminance

Question 10 of 22

Question 11 of 22

11. In which position are MB type high pressure mercury vapour lamps operated?

Any position

Inclined

Vertical

Horizontal

Question 11 of 22

Question 12 of 22

12. Which is a cold cathode lamp?

Halogen lamp

Neon sign lamp

Fluorescent lamp

Mercury vapor lamp

Question 12 of 22

Question 13 of 22

13. Which lighting design type is glare-free?

Indirect

Direct

Semi-indirect

Semi-direct

Question 13 of 22

Question 14 of 22

14. What is the unit of luminous flux?

Lumen

Lumen/m²

Lux

Candela

Question 14 of 22

Question 15 of 22

15. What is the unit of luminous efficiency?

Lux

Lumen/watt

Lumen

Lumen/m²

Question 15 of 22

Question 16 of 22

16. What is the current capacity of flasher if current is 100mA per row?

300 mA

100 mA

200 mA

50 mA

Question 16 of 22

Question 17 of 22

17. What is the purpose of ignitor in high pressure sodium vapour lamps?

Decrease starting current

Generate high voltage starting pulse

Decrease running current

Increase running voltage

Question 17 of 22

Question 18 of 22

18. What is the main advantage of coiled coil lamps?

Low power consumption

Low operating voltage

Higher light output

High melting point

Question 18 of 22

Question 19 of 22

19. Which material is coated on tungsten electrode in fluorescent tube lamps?

Barium and strontium oxide

Silver oxide

Phosphor powder

Fluorescent powder

Question 19 of 22

Question 20 of 22

20. What is the working temperature of filament lamp?

2300°C

1800°C

2000°C

1500°C

Question 20 of 22

Question 21 of 22

21. What is the function of leak transformer in high pressure sodium vapour lamp circuit?

Reduce starting current

Reduce working voltage

Increase working voltage

Provide initial high voltage ignition

Question 21 of 22

Question 22 of 22

22. Which lighting system is used for flood and industrial lighting?

Semi-indirect lighting

Semi-direct lighting

Indirect lighting

Direct lighting

Question 22 of 22