ELECTRICIAN 1st YEAR MODULE – Illumination

Question 1 of 22

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

Generate high voltage starting pulse

Increase running voltage

Decrease starting current

Decrease running current

Question 1 of 22

Question 2 of 22

2. 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 2 of 22

Question 3 of 22

3. What type of reflector is this?

Soft light type

Dispersive type

Parabolic type

Mirror type

Question 3 of 22

Question 4 of 22

4. What type of lamp is this?

MAT type MV lamp

MB type HPMV lamp

MA type HPMV lamp

HP metal halide lamp

Question 4 of 22

Question 5 of 22

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

Silver oxide

Barium and strontium oxide

Phosphor powder

Fluorescent powder

Question 5 of 22

Question 6 of 22

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

Low power consumption

High melting point

Higher light output

Low operating voltage

Question 6 of 22

Question 7 of 22

7. Which lighting design type is glare-free?

Indirect

Semi-direct

Direct

Semi-indirect

Question 7 of 22

Question 8 of 22

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

Provide initial high voltage ignition

Reduce working voltage

Reduce starting current

Increase working voltage

Question 8 of 22

Question 9 of 22

9. What is this type of light called?

Spotlight

Bulk light

Flash light

Flood light

Question 9 of 22

Question 10 of 22

10. What is the unit of luminous efficiency?

Lumen/watt

Lumen

Lumen/m²

Lux

Question 10 of 22

Question 11 of 22

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

Indirect lighting

Semi-direct lighting

Direct lighting

Semi-indirect lighting

Question 11 of 22

Question 12 of 22

12. How is evaporation rate reduced in vacuum bulbs?

Filling with inert gas

Producing arc in bulb

Increasing filament resistance

Reducing filament resistance

Question 12 of 22

Question 13 of 22

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

Steradian

Candela

Lumen

Lux

Question 13 of 22

Question 14 of 22

14. Which is a cold cathode lamp?

Mercury vapor lamp

Neon sign lamp

Fluorescent lamp

Halogen lamp

Question 14 of 22

Question 15 of 22

15. What is the unit of luminous flux?

Lumen/m²

Lumen

Lux

Candela

Question 15 of 22

Question 16 of 22

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

Luminous flux

Illuminance

Lumen

Luminous intensity

Question 16 of 22

Question 17 of 22

17. What is the working temperature of filament lamp?

2300°C

1800°C

2000°C

1500°C

Question 17 of 22

Question 18 of 22

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

Vertical

Any position

Horizontal

Inclined

Question 18 of 22

Question 19 of 22

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

Increase lighting effect

Reduce UV radiation

Withstand high temperature

Withstand atmospheric pressure

Question 19 of 22

Question 20 of 22

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

Illuminance

Luminous intensity

Candela

Lumen

Question 20 of 22

Question 21 of 22

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

Leak transformer

Sodium vapor

Arc tube

High pressure aluminum oxide

Question 21 of 22

Question 22 of 22

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

100 mA

50 mA

200 mA

300 mA

Question 22 of 22