Question 1 of 22

1. How is evaporation rate reduced in vacuum bulbs?

Producing arc in bulb

Filling with inert gas

Reducing filament resistance

Increasing filament resistance

Question 1 of 22

Question 2 of 22

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

Steradian

Lumen

Lux

Candela

Question 2 of 22

Question 3 of 22

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

Higher light output

High melting point

Low power consumption

Low operating voltage

Question 3 of 22

Question 4 of 22

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

Luminous flux

Luminous intensity

Lumen

Illuminance

Question 4 of 22

Question 5 of 22

5. What type of lamp is this?

HP metal halide lamp

MB type HPMV lamp

MA type HPMV lamp

MAT type MV lamp

Question 5 of 22

Question 6 of 22

6. 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 6 of 22

Question 7 of 22

7. What is this type of light called?

Flood light

Bulk light

Spotlight

Flash light

Question 7 of 22

Question 8 of 22

8. What is the unit of luminous flux?

Candela

Lumen/m²

Lux

Lumen

Question 8 of 22

Question 9 of 22

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

Decrease starting current

Increase running voltage

Decrease running current

Generate high voltage starting pulse

Question 9 of 22

Question 10 of 22

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

High pressure aluminum oxide

Arc tube

Sodium vapor

Leak transformer

Question 10 of 22

Question 11 of 22

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

Withstand high temperature

Reduce UV radiation

Withstand atmospheric pressure

Increase lighting effect

Question 11 of 22

Question 12 of 22

12. Which is a cold cathode lamp?

Halogen lamp

Fluorescent lamp

Neon sign lamp

Mercury vapor lamp

Question 12 of 22

Question 13 of 22

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

300 mA

50 mA

200 mA

100 mA

Question 13 of 22

Question 14 of 22

14. Which lighting design type is glare-free?

Direct

Semi-indirect

Semi-direct

Indirect

Question 14 of 22

Question 15 of 22

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

Silver oxide

Barium and strontium oxide

Phosphor powder

Fluorescent powder

Question 15 of 22

Question 16 of 22

16. What is the unit of luminous efficiency?

Lumen/watt

Lumen/m²

Lumen

Lux

Question 16 of 22

Question 17 of 22

17. What is the working temperature of filament lamp?

2000°C

2300°C

1800°C

1500°C

Question 17 of 22

Question 18 of 22

18. What type of reflector is this?

Dispersive type

Mirror type

Parabolic type

Soft light type

Question 18 of 22

Question 19 of 22

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

Luminous intensity

Candela

Lumen

Illuminance

Question 19 of 22

Question 20 of 22

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

Horizontal

Vertical

Any position

Inclined

Question 20 of 22

Question 21 of 22

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

Semi-direct lighting

Indirect lighting

Direct lighting

Semi-indirect lighting

Question 21 of 22

Question 22 of 22

22. 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 one tube

Capacitor in series with supply

Question 22 of 22