ELECTRICIAN 1st YEAR MODULE – Illumination

Question 1 of 22

1. What is the unit of luminous efficiency?

Lux

Lumen

Lumen/m²

Lumen/watt

Question 1 of 22

Question 2 of 22

2. What type of lamp is this?

MAT type MV lamp

MA type HPMV lamp

MB type HPMV lamp

HP metal halide lamp

Question 2 of 22

Question 3 of 22

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

50 mA

200 mA

100 mA

300 mA

Question 3 of 22

Question 4 of 22

4. How is evaporation rate reduced in vacuum bulbs?

Producing arc in bulb

Filling with inert gas

Increasing filament resistance

Reducing filament resistance

Question 4 of 22

Question 5 of 22

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

Reduce working voltage

Increase working voltage

Provide initial high voltage ignition

Reduce starting current

Question 5 of 22

Question 6 of 22

6. Which lighting design type is glare-free?

Semi-direct

Direct

Indirect

Semi-indirect

Question 6 of 22

Question 7 of 22

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

Candela

Lumen

Luminous intensity

Illuminance

Question 7 of 22

Question 8 of 22

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

Capacitor parallel to supply

Capacitor in series with one tube

Two capacitors in series (one per tube)

Capacitor in series with supply

Question 8 of 22

Question 9 of 22

9. What is the working temperature of filament lamp?

2000°C

1800°C

1500°C

2300°C

Question 9 of 22

Question 10 of 22

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

Withstand atmospheric pressure

Increase lighting effect

Withstand high temperature

Reduce UV radiation

Question 10 of 22

Question 11 of 22

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

Low operating voltage

Higher light output

Low power consumption

High melting point

Question 11 of 22

Question 12 of 22

12. What is the unit of luminous flux?

Lumen

Candela

Lux

Lumen/m²

Question 12 of 22

Question 13 of 22

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

Phosphor powder

Fluorescent powder

Silver oxide

Barium and strontium oxide

Question 13 of 22

Question 14 of 22

14. What type of reflector is this?

Mirror type

Soft light type

Dispersive type

Parabolic type

Question 14 of 22

Question 15 of 22

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

Luminous intensity

Luminous flux

Lumen

Illuminance

Question 15 of 22

Question 16 of 22

16. What is this type of light called?

Spotlight

Bulk light

Flash light

Flood light

Question 16 of 22

Question 17 of 22

17. Which is a cold cathode lamp?

Halogen lamp

Fluorescent lamp

Mercury vapor lamp

Neon sign lamp

Question 17 of 22

Question 18 of 22

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

Lux

Steradian

Lumen

Candela

Question 18 of 22

Question 19 of 22

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

Any position

Vertical

Inclined

Horizontal

Question 19 of 22

Question 20 of 22

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

Indirect lighting

Direct lighting

Semi-direct lighting

Semi-indirect lighting

Question 20 of 22

Question 21 of 22

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

Decrease running current

Generate high voltage starting pulse

Increase running voltage

Decrease starting current

Question 21 of 22

Question 22 of 22

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

Arc tube

High pressure aluminum oxide

Leak transformer

Sodium vapor

Question 22 of 22