Question 1 of 22

1. What is the unit of luminous flux?

Lumen

Lumen/m²

Candela

Lux

Question 1 of 22

Question 2 of 22

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

Indirect lighting

Direct lighting

Semi-indirect lighting

Semi-direct lighting

Question 2 of 22

Question 3 of 22

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

Phosphor powder

Barium and strontium oxide

Fluorescent powder

Silver oxide

Question 3 of 22

Question 4 of 22

4. What is the working temperature of filament lamp?

1500°C

2000°C

2300°C

1800°C

Question 4 of 22

Question 5 of 22

5. What type of lamp is this?

HP metal halide lamp

MAT type MV lamp

MB type HPMV lamp

MA type HPMV lamp

Question 5 of 22

Question 6 of 22

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

Horizontal

Inclined

Vertical

Any position

Question 6 of 22

Question 7 of 22

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

Candela

Lux

Lumen

Steradian

Question 7 of 22

Question 8 of 22

8. What is this type of light called?

Spotlight

Flash light

Bulk light

Flood light

Question 8 of 22

Question 9 of 22

9. How is evaporation rate reduced in vacuum bulbs?

Filling with inert gas

Reducing filament resistance

Producing arc in bulb

Increasing filament resistance

Question 9 of 22

Question 10 of 22

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

Low power consumption

High melting point

Low operating voltage

Higher light output

Question 10 of 22

Question 11 of 22

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

Reduce UV radiation

Increase lighting effect

Withstand high temperature

Withstand atmospheric pressure

Question 11 of 22

Question 12 of 22

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

Reduce working voltage

Provide initial high voltage ignition

Increase working voltage

Reduce starting current

Question 12 of 22

Question 13 of 22

13. 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 13 of 22

Question 14 of 22

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

Leak transformer

High pressure aluminum oxide

Arc tube

Sodium vapor

Question 14 of 22

Question 15 of 22

15. What is the unit of luminous efficiency?

Lumen

Lumen/m²

Lumen/watt

Lux

Question 15 of 22

Question 16 of 22

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

Luminous intensity

Illuminance

Candela

Lumen

Question 16 of 22

Question 17 of 22

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

Lumen

Luminous intensity

Luminous flux

Illuminance

Question 17 of 22

Question 18 of 22

18. What type of reflector is this?

Dispersive type

Soft light type

Parabolic type

Mirror type

Question 18 of 22

Question 19 of 22

19. 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 supply

Capacitor in series with one tube

Question 19 of 22

Question 20 of 22

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

100 mA

300 mA

50 mA

200 mA

Question 20 of 22

Question 21 of 22

21. Which lighting design type is glare-free?

Indirect

Semi-direct

Semi-indirect

Direct

Question 21 of 22

Question 22 of 22

22. Which is a cold cathode lamp?

Neon sign lamp

Mercury vapor lamp

Fluorescent lamp

Halogen lamp

Question 22 of 22