Question 1 of 22

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

Low power consumption

High melting point

Low operating voltage

Higher light output

Question 1 of 22

Question 2 of 22

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

Two capacitors in series (one per tube)

Capacitor parallel to supply

Capacitor in series with one tube

Capacitor in series with supply

Question 2 of 22

Question 3 of 22

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

Increase working voltage

Provide initial high voltage ignition

Reduce starting current

Reduce working voltage

Question 3 of 22

Question 4 of 22

4. 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 4 of 22

Question 5 of 22

5. Which lighting design type is glare-free?

Semi-indirect

Indirect

Semi-direct

Direct

Question 5 of 22

Question 6 of 22

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

Direct lighting

Semi-indirect lighting

Semi-direct lighting

Indirect lighting

Question 6 of 22

Question 7 of 22

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

Horizontal

Vertical

Any position

Inclined

Question 7 of 22

Question 8 of 22

8. What is this type of light called?

Spotlight

Flash light

Flood light

Bulk light

Question 8 of 22

Question 9 of 22

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

Lumen

Illuminance

Luminous intensity

Candela

Question 9 of 22

Question 10 of 22

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

300 mA

100 mA

50 mA

200 mA

Question 10 of 22

Question 11 of 22

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

Leak transformer

Arc tube

Sodium vapor

High pressure aluminum oxide

Question 11 of 22

Question 12 of 22

12. Which is a cold cathode lamp?

Halogen lamp

Mercury vapor lamp

Neon sign lamp

Fluorescent lamp

Question 12 of 22

Question 13 of 22

13. What is the working temperature of filament lamp?

2000°C

2300°C

1500°C

1800°C

Question 13 of 22

Question 14 of 22

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

Increase running voltage

Decrease running current

Decrease starting current

Generate high voltage starting pulse

Question 14 of 22

Question 15 of 22

15. What is the unit of luminous flux?

Lux

Lumen/m²

Lumen

Candela

Question 15 of 22

Question 16 of 22

16. What is the unit of luminous efficiency?

Lumen

Lumen/watt

Lumen/m²

Lux

Question 16 of 22

Question 17 of 22

17. What type of lamp is this?

MB type HPMV lamp

HP metal halide lamp

MA type HPMV lamp

MAT type MV lamp

Question 17 of 22

Question 18 of 22

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

Lumen

Steradian

Lux

Candela

Question 18 of 22

Question 19 of 22

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

Illuminance

Luminous flux

Luminous intensity

Lumen

Question 19 of 22

Question 20 of 22

20. How is evaporation rate reduced in vacuum bulbs?

Filling with inert gas

Reducing filament resistance

Increasing filament resistance

Producing arc in bulb

Question 20 of 22

Question 21 of 22

21. What type of reflector is this?

Parabolic type

Soft light type

Dispersive type

Mirror type

Question 21 of 22

Question 22 of 22

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

Silver oxide

Barium and strontium oxide

Fluorescent powder

Phosphor powder

Question 22 of 22