Question 1 of 22

1. What is the unit of luminous flux?

Lux

Candela

Lumen

Lumen/m²

Question 1 of 22

Question 2 of 22

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

Withstand high temperature

Withstand atmospheric pressure

Increase lighting effect

Reduce UV radiation

Question 2 of 22

Question 3 of 22

3. Which is a cold cathode lamp?

Mercury vapor lamp

Halogen lamp

Fluorescent lamp

Neon sign lamp

Question 3 of 22

Question 4 of 22

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

Fluorescent powder

Phosphor powder

Barium and strontium oxide

Silver oxide

Question 4 of 22

Question 5 of 22

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

Direct lighting

Semi-direct lighting

Semi-indirect lighting

Indirect lighting

Question 5 of 22

Question 6 of 22

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

Low operating voltage

Higher light output

High melting point

Low power consumption

Question 6 of 22

Question 7 of 22

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

Increase working voltage

Reduce working voltage

Provide initial high voltage ignition

Reduce starting current

Question 7 of 22

Question 8 of 22

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

Lux

Steradian

Lumen

Candela

Question 8 of 22

Question 9 of 22

9. What is the unit of luminous efficiency?

Lumen/m²

Lumen/watt

Lux

Lumen

Question 9 of 22

Question 10 of 22

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

Sodium vapor

Leak transformer

Arc tube

High pressure aluminum oxide

Question 10 of 22

Question 11 of 22

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

Candela

Luminous intensity

Lumen

Illuminance

Question 11 of 22

Question 12 of 22

12. What is the working temperature of filament lamp?

2300°C

1800°C

1500°C

2000°C

Question 12 of 22

Question 13 of 22

13. How is evaporation rate reduced in vacuum bulbs?

Reducing filament resistance

Producing arc in bulb

Increasing filament resistance

Filling with inert gas

Question 13 of 22

Question 14 of 22

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

Capacitor parallel to supply

Capacitor in series with supply

Two capacitors in series (one per tube)

Capacitor in series with one tube

Question 14 of 22

Question 15 of 22

15. What is this type of light called?

Bulk light

Spotlight

Flood light

Flash light

Question 15 of 22

Question 16 of 22

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

Luminous intensity

Luminous flux

Illuminance

Lumen

Question 16 of 22

Question 17 of 22

17. What type of lamp is this?

MAT type MV lamp

HP metal halide lamp

MA type HPMV lamp

MB type HPMV lamp

Question 17 of 22

Question 18 of 22

18. 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 18 of 22

Question 19 of 22

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

Inclined

Vertical

Any position

Horizontal

Question 19 of 22

Question 20 of 22

20. What type of reflector is this?

Mirror type

Parabolic type

Dispersive type

Soft light type

Question 20 of 22

Question 21 of 22

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

100 mA

200 mA

50 mA

300 mA

Question 21 of 22

Question 22 of 22

22. Which lighting design type is glare-free?

Direct

Semi-direct

Indirect

Semi-indirect

Question 22 of 22