ELECTRICIAN 1st YEAR MODULE – Illumination

Question 1 of 22

1. What type of reflector is this?

Soft light type

Parabolic type

Dispersive type

Mirror type

Question 1 of 22

Question 2 of 22

2. What type of lamp is this?

MA type HPMV lamp

MAT type MV lamp

HP metal halide lamp

MB type HPMV lamp

Question 2 of 22

Question 3 of 22

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

Lumen

Lux

Candela

Steradian

Question 3 of 22

Question 4 of 22

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

Luminous intensity

Lumen

Illuminance

Candela

Question 4 of 22

Question 5 of 22

5. What is this type of light called?

Flash light

Flood light

Spotlight

Bulk light

Question 5 of 22

Question 6 of 22

6. What is the unit of luminous efficiency?

Lumen/watt

Lumen

Lumen/m²

Lux

Question 6 of 22

Question 7 of 22

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

Increase working voltage

Reduce working voltage

Provide initial high voltage ignition

Reduce starting current

Question 7 of 22

Question 8 of 22

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

Increase lighting effect

Withstand atmospheric pressure

Withstand high temperature

Reduce UV radiation

Question 8 of 22

Question 9 of 22

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

300 mA

50 mA

200 mA

100 mA

Question 9 of 22

Question 10 of 22

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

Low power consumption

Low operating voltage

High melting point

Higher light output

Question 10 of 22

Question 11 of 22

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

Capacitor parallel to supply

Capacitor in series with supply

Capacitor in series with one tube

Two capacitors in series (one per tube)

Question 11 of 22

Question 12 of 22

12. Which lighting design type is glare-free?

Indirect

Direct

Semi-direct

Semi-indirect

Question 12 of 22

Question 13 of 22

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

Horizontal

Any position

Vertical

Inclined

Question 13 of 22

Question 14 of 22

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

High pressure aluminum oxide

Arc tube

Leak transformer

Sodium vapor

Question 14 of 22

Question 15 of 22

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

Lumen

Illuminance

Luminous intensity

Luminous flux

Question 15 of 22

Question 16 of 22

16. How is evaporation rate reduced in vacuum bulbs?

Producing arc in bulb

Reducing filament resistance

Increasing filament resistance

Filling with inert gas

Question 16 of 22

Question 17 of 22

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

Decrease starting current

Decrease running current

Generate high voltage starting pulse

Increase running voltage

Question 17 of 22

Question 18 of 22

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

Silver oxide

Barium and strontium oxide

Fluorescent powder

Phosphor powder

Question 18 of 22

Question 19 of 22

19. What is the unit of luminous flux?

Lumen/m²

Lux

Candela

Lumen

Question 19 of 22

Question 20 of 22

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

Semi-direct lighting

Direct lighting

Indirect lighting

Semi-indirect lighting

Question 20 of 22

Question 21 of 22

21. Which is a cold cathode lamp?

Neon sign lamp

Halogen lamp

Mercury vapor lamp

Fluorescent lamp

Question 21 of 22

Question 22 of 22

22. What is the working temperature of filament lamp?

2000°C

1500°C

1800°C

2300°C

Question 22 of 22