Question 1 of 22

1. What is the working temperature of filament lamp?

1800°C

1500°C

2000°C

2300°C

Question 1 of 22

Question 2 of 22

2. How is evaporation rate reduced in vacuum bulbs?

Producing arc in bulb

Filling with inert gas

Reducing filament resistance

Increasing filament resistance

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

Leak transformer

Sodium vapor

Question 3 of 22

Question 4 of 22

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

100 mA

300 mA

200 mA

50 mA

Question 4 of 22

Question 5 of 22

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

Semi-indirect lighting

Indirect lighting

Direct lighting

Semi-direct lighting

Question 5 of 22

Question 6 of 22

6. What is this type of light called?

Flood light

Flash light

Spotlight

Bulk light

Question 6 of 22

Question 7 of 22

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

Generate high voltage starting pulse

Increase running voltage

Decrease starting current

Decrease running current

Question 7 of 22

Question 8 of 22

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

Illuminance

Lumen

Luminous intensity

Candela

Question 8 of 22

Question 9 of 22

9. What type of reflector is this?

Soft light type

Dispersive type

Parabolic type

Mirror type

Question 9 of 22

Question 10 of 22

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

Reduce starting current

Provide initial high voltage ignition

Reduce working voltage

Increase working voltage

Question 10 of 22

Question 11 of 22

11. What is the unit of luminous flux?

Candela

Lumen/m²

Lux

Lumen

Question 11 of 22

Question 12 of 22

12. What is the unit of luminous efficiency?

Lumen/watt

Lux

Lumen/m²

Lumen

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. Which is a cold cathode lamp?

Halogen lamp

Mercury vapor lamp

Neon sign lamp

Fluorescent lamp

Question 14 of 22

Question 15 of 22

15. What type of lamp is this?

MA type HPMV lamp

MAT type MV lamp

MB type HPMV lamp

HP metal halide lamp

Question 15 of 22

Question 16 of 22

16. 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 16 of 22

Question 17 of 22

17. Which lighting design type is glare-free?

Semi-direct

Direct

Semi-indirect

Indirect

Question 17 of 22

Question 18 of 22

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

Horizontal

Any position

Vertical

Inclined

Question 18 of 22

Question 19 of 22

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

Barium and strontium oxide

Phosphor powder

Silver oxide

Fluorescent powder

Question 19 of 22

Question 20 of 22

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

Capacitor parallel to supply

Two capacitors in series (one per tube)

Capacitor in series with supply

Capacitor in series with one tube

Question 20 of 22

Question 21 of 22

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

Illuminance

Lumen

Luminous intensity

Luminous flux

Question 21 of 22

Question 22 of 22

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

Low power consumption

High melting point

Higher light output

Low operating voltage

Question 22 of 22