ELECTRICIAN 1st YEAR MODULE – Illumination

Question 1 of 22

1. What type of lamp is this?

MAT type MV lamp

MA type HPMV lamp

HP metal halide lamp

MB type HPMV lamp

Question 1 of 22

Question 2 of 22

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

Luminous intensity

Lumen

Illuminance

Luminous flux

Question 2 of 22

Question 3 of 22

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

Sodium vapor

Leak transformer

High pressure aluminum oxide

Arc tube

Question 3 of 22

Question 4 of 22

4. What is this type of light called?

Spotlight

Flood light

Flash light

Bulk light

Question 4 of 22

Question 5 of 22

5. How is evaporation rate reduced in vacuum bulbs?

Filling with inert gas

Producing arc in bulb

Increasing filament resistance

Reducing filament resistance

Question 5 of 22

Question 6 of 22

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

Higher light output

High melting point

Low operating voltage

Low power consumption

Question 6 of 22

Question 7 of 22

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

Inclined

Any position

Vertical

Horizontal

Question 7 of 22

Question 8 of 22

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

Two capacitors in series (one per tube)

Capacitor in series with one tube

Capacitor in series with supply

Capacitor parallel to supply

Question 8 of 22

Question 9 of 22

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

Candela

Lumen

Illuminance

Luminous intensity

Question 9 of 22

Question 10 of 22

10. What is the working temperature of filament lamp?

2300°C

2000°C

1800°C

1500°C

Question 10 of 22

Question 11 of 22

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

Barium and strontium oxide

Silver oxide

Phosphor powder

Fluorescent powder

Question 11 of 22

Question 12 of 22

12. What type of reflector is this?

Mirror type

Parabolic type

Soft light type

Dispersive type

Question 12 of 22

Question 13 of 22

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

300 mA

200 mA

50 mA

100 mA

Question 13 of 22

Question 14 of 22

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

Provide initial high voltage ignition

Reduce starting current

Increase working voltage

Reduce working voltage

Question 14 of 22

Question 15 of 22

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

Reduce UV radiation

Withstand high temperature

Withstand atmospheric pressure

Increase lighting effect

Question 15 of 22

Question 16 of 22

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

Candela

Steradian

Lux

Lumen

Question 16 of 22

Question 17 of 22

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

Increase running voltage

Generate high voltage starting pulse

Decrease running current

Decrease starting current

Question 17 of 22

Question 18 of 22

18. What is the unit of luminous flux?

Lumen

Lux

Lumen/m²

Candela

Question 18 of 22

Question 19 of 22

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

Semi-direct lighting

Semi-indirect lighting

Direct lighting

Indirect lighting

Question 19 of 22

Question 20 of 22

20. Which is a cold cathode lamp?

Halogen lamp

Fluorescent lamp

Neon sign lamp

Mercury vapor lamp

Question 20 of 22

Question 21 of 22

21. Which lighting design type is glare-free?

Direct

Semi-indirect

Semi-direct

Indirect

Question 21 of 22

Question 22 of 22

22. What is the unit of luminous efficiency?

Lumen/watt

Lumen/m²

Lux

Lumen

Question 22 of 22