Question 1 of 22

1. What is the unit of luminous efficiency?

Lumen/watt

Lux

Lumen/m²

Lumen

Question 1 of 22

Question 2 of 22

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

High pressure aluminum oxide

Leak transformer

Sodium vapor

Arc tube

Question 2 of 22

Question 3 of 22

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

Decrease starting current

Decrease running current

Increase running voltage

Generate high voltage starting pulse

Question 3 of 22

Question 4 of 22

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

Luminous intensity

Luminous flux

Lumen

Illuminance

Question 4 of 22

Question 5 of 22

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

Silver oxide

Phosphor powder

Barium and strontium oxide

Fluorescent powder

Question 5 of 22

Question 6 of 22

6. How is evaporation rate reduced in vacuum bulbs?

Filling with inert gas

Reducing filament resistance

Producing arc in bulb

Increasing filament resistance

Question 6 of 22

Question 7 of 22

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

Semi-indirect lighting

Semi-direct lighting

Direct lighting

Indirect lighting

Question 7 of 22

Question 8 of 22

8. What type of lamp is this?

MAT type MV lamp

MB type HPMV lamp

HP metal halide lamp

MA type HPMV lamp

Question 8 of 22

Question 9 of 22

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

Increase working voltage

Reduce working voltage

Reduce starting current

Provide initial high voltage ignition

Question 9 of 22

Question 10 of 22

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

Withstand atmospheric pressure

Withstand high temperature

Reduce UV radiation

Increase lighting effect

Question 10 of 22

Question 11 of 22

11. What is the unit of luminous flux?

Lumen

Candela

Lumen/m²

Lux

Question 11 of 22

Question 12 of 22

12. Which is a cold cathode lamp?

Neon sign lamp

Halogen lamp

Mercury vapor lamp

Fluorescent lamp

Question 12 of 22

Question 13 of 22

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

Lumen

Steradian

Lux

Candela

Question 13 of 22

Question 14 of 22

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

Vertical

Horizontal

Any position

Inclined

Question 14 of 22

Question 15 of 22

15. What is the working temperature of filament lamp?

1800°C

2000°C

2300°C

1500°C

Question 15 of 22

Question 16 of 22

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

Capacitor parallel to supply

Capacitor in series with one tube

Two capacitors in series (one per tube)

Capacitor in series with supply

Question 16 of 22

Question 17 of 22

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

Candela

Illuminance

Luminous intensity

Lumen

Question 17 of 22

Question 18 of 22

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

200 mA

50 mA

300 mA

100 mA

Question 18 of 22

Question 19 of 22

19. Which lighting design type is glare-free?

Semi-direct

Indirect

Direct

Semi-indirect

Question 19 of 22

Question 20 of 22

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

Higher light output

High melting point

Low operating voltage

Low power consumption

Question 20 of 22

Question 21 of 22

21. What type of reflector is this?

Soft light type

Dispersive type

Parabolic type

Mirror type

Question 21 of 22

Question 22 of 22

22. What is this type of light called?

Bulk light

Flash light

Spotlight

Flood light

Question 22 of 22