Question 1 of 22

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

Candela

Steradian

Lumen

Lux

Question 1 of 22

Question 2 of 22

2. What type of reflector is this?

Soft light type

Dispersive type

Parabolic type

Mirror type

Question 2 of 22

Question 3 of 22

3. What is the unit of luminous efficiency?

Lumen

Lumen/watt

Lux

Lumen/m²

Question 3 of 22

Question 4 of 22

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

Provide initial high voltage ignition

Increase working voltage

Reduce starting current

Reduce working voltage

Question 4 of 22

Question 5 of 22

5. What is the unit of luminous flux?

Lux

Candela

Lumen/m²

Lumen

Question 5 of 22

Question 6 of 22

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

Luminous flux

Illuminance

Luminous intensity

Lumen

Question 6 of 22

Question 7 of 22

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

Indirect lighting

Semi-indirect lighting

Semi-direct lighting

Direct lighting

Question 7 of 22

Question 8 of 22

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

Phosphor powder

Silver oxide

Barium and strontium oxide

Fluorescent powder

Question 8 of 22

Question 9 of 22

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

Reduce UV radiation

Withstand atmospheric pressure

Increase lighting effect

Withstand high temperature

Question 9 of 22

Question 10 of 22

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

Leak transformer

Arc tube

Sodium vapor

High pressure aluminum oxide

Question 10 of 22

Question 11 of 22

11. What type of lamp is this?

HP metal halide lamp

MA type HPMV lamp

MB type HPMV lamp

MAT type MV lamp

Question 11 of 22

Question 12 of 22

12. Which lighting design type is glare-free?

Semi-indirect

Direct

Semi-direct

Indirect

Question 12 of 22

Question 13 of 22

13. What is the working temperature of filament lamp?

1800°C

1500°C

2000°C

2300°C

Question 13 of 22

Question 14 of 22

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

Capacitor in series with one tube

Capacitor parallel to supply

Capacitor in series with supply

Two capacitors in series (one per tube)

Question 14 of 22

Question 15 of 22

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

Illuminance

Luminous intensity

Lumen

Candela

Question 15 of 22

Question 16 of 22

16. What is this type of light called?

Bulk light

Flash light

Flood light

Spotlight

Question 16 of 22

Question 17 of 22

17. Which is a cold cathode lamp?

Neon sign lamp

Mercury vapor lamp

Fluorescent lamp

Halogen lamp

Question 17 of 22

Question 18 of 22

18. How is evaporation rate reduced in vacuum bulbs?

Filling with inert gas

Reducing filament resistance

Producing arc in bulb

Increasing filament resistance

Question 18 of 22

Question 19 of 22

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

Horizontal

Inclined

Any position

Vertical

Question 19 of 22

Question 20 of 22

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

100 mA

200 mA

300 mA

50 mA

Question 20 of 22

Question 21 of 22

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

Decrease starting current

Increase running voltage

Generate high voltage starting pulse

Decrease running current

Question 21 of 22

Question 22 of 22

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

High melting point

Low power consumption

Low operating voltage

Higher light output

Question 22 of 22