Question 1 of 22

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

Silver oxide

Barium and strontium oxide

Fluorescent powder

Phosphor powder

Question 1 of 22

Question 2 of 22

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

Lumen

Illuminance

Luminous intensity

Candela

Question 2 of 22

Question 3 of 22

3. What is the working temperature of filament lamp?

2000°C

2300°C

1800°C

1500°C

Question 3 of 22

Question 4 of 22

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

Semi-indirect lighting

Direct lighting

Semi-direct lighting

Indirect lighting

Question 4 of 22

Question 5 of 22

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

Withstand atmospheric pressure

Withstand high temperature

Increase lighting effect

Reduce UV radiation

Question 5 of 22

Question 6 of 22

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

Capacitor in series with supply

Two capacitors in series (one per tube)

Capacitor in series with one tube

Capacitor parallel to supply

Question 6 of 22

Question 7 of 22

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

High pressure aluminum oxide

Sodium vapor

Arc tube

Leak transformer

Question 7 of 22

Question 8 of 22

8. Which lighting design type is glare-free?

Indirect

Semi-direct

Semi-indirect

Direct

Question 8 of 22

Question 9 of 22

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

Provide initial high voltage ignition

Reduce starting current

Reduce working voltage

Increase working voltage

Question 9 of 22

Question 10 of 22

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

Luminous flux

Lumen

Illuminance

Luminous intensity

Question 10 of 22

Question 11 of 22

11. What type of reflector is this?

Parabolic type

Dispersive type

Mirror type

Soft light type

Question 11 of 22

Question 12 of 22

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

Candela

Lux

Steradian

Lumen

Question 12 of 22

Question 13 of 22

13. How is evaporation rate reduced in vacuum bulbs?

Producing arc in bulb

Increasing filament resistance

Reducing filament resistance

Filling with inert gas

Question 13 of 22

Question 14 of 22

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

Decrease running current

Decrease starting current

Increase running voltage

Generate high voltage starting pulse

Question 14 of 22

Question 15 of 22

15. What is this type of light called?

Flash light

Flood light

Spotlight

Bulk light

Question 15 of 22

Question 16 of 22

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

100 mA

50 mA

300 mA

200 mA

Question 16 of 22

Question 17 of 22

17. What is the unit of luminous flux?

Lux

Candela

Lumen/m²

Lumen

Question 17 of 22

Question 18 of 22

18. What is the unit of luminous efficiency?

Lumen

Lux

Lumen/watt

Lumen/m²

Question 18 of 22

Question 19 of 22

19. Which is a cold cathode lamp?

Halogen lamp

Mercury vapor lamp

Neon sign lamp

Fluorescent lamp

Question 19 of 22

Question 20 of 22

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

High melting point

Low power consumption

Low operating voltage

Higher light output

Question 20 of 22

Question 21 of 22

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

Horizontal

Any position

Vertical

Inclined

Question 21 of 22

Question 22 of 22

22. What type of lamp is this?

MAT type MV lamp

HP metal halide lamp

MB type HPMV lamp

MA type HPMV lamp

Question 22 of 22