Question 1 of 22

1. What is the unit of luminous efficiency?

Lumen/watt

Lux

Lumen

Lumen/m²

Question 1 of 22

Question 2 of 22

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

Lumen

Luminous intensity

Illuminance

Luminous flux

Question 2 of 22

Question 3 of 22

3. Which lighting design type is glare-free?

Semi-indirect

Indirect

Semi-direct

Direct

Question 3 of 22

Question 4 of 22

4. 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 4 of 22

Question 5 of 22

5. How is evaporation rate reduced in vacuum bulbs?

Increasing filament resistance

Producing arc in bulb

Reducing filament resistance

Filling with inert gas

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

Provide initial high voltage ignition

Reduce working voltage

Reduce starting current

Question 6 of 22

Question 7 of 22

7. What is this type of light called?

Bulk light

Spotlight

Flood light

Flash light

Question 7 of 22

Question 8 of 22

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

Luminous intensity

Illuminance

Candela

Lumen

Question 8 of 22

Question 9 of 22

9. Which is a cold cathode lamp?

Mercury vapor lamp

Halogen lamp

Fluorescent lamp

Neon sign lamp

Question 9 of 22

Question 10 of 22

10. What is the unit of luminous flux?

Lux

Lumen

Candela

Lumen/m²

Question 10 of 22

Question 11 of 22

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

300 mA

50 mA

200 mA

100 mA

Question 11 of 22

Question 12 of 22

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

Inclined

Horizontal

Any position

Vertical

Question 12 of 22

Question 13 of 22

13. What is the working temperature of filament lamp?

1500°C

1800°C

2000°C

2300°C

Question 13 of 22

Question 14 of 22

14. What type of lamp is this?

MA type HPMV lamp

MAT type MV lamp

HP metal halide lamp

MB type HPMV lamp

Question 14 of 22

Question 15 of 22

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

Low power consumption

Low operating voltage

Higher light output

High melting point

Question 15 of 22

Question 16 of 22

16. What type of reflector is this?

Soft light type

Mirror type

Dispersive type

Parabolic type

Question 16 of 22

Question 17 of 22

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

Steradian

Lux

Candela

Lumen

Question 17 of 22

Question 18 of 22

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

Sodium vapor

Arc tube

High pressure aluminum oxide

Leak transformer

Question 18 of 22

Question 19 of 22

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

Semi-indirect lighting

Semi-direct lighting

Indirect lighting

Direct lighting

Question 19 of 22

Question 20 of 22

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

Fluorescent powder

Silver oxide

Barium and strontium oxide

Phosphor powder

Question 20 of 22

Question 21 of 22

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

Decrease starting current

Increase running voltage

Generate high voltage starting pulse

Decrease running current

Question 21 of 22

Question 22 of 22

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

Capacitor in series with supply

Capacitor in series with one tube

Capacitor parallel to supply

Two capacitors in series (one per tube)

Question 22 of 22