ELECTRICIAN 1st YEAR MODULE – Illumination

Question 1 of 22

1. What is the unit of luminous efficiency?

Lux

Lumen/watt

Lumen/m²

Lumen

Question 1 of 22

Question 2 of 22

2. Which lighting design type is glare-free?

Direct

Semi-direct

Indirect

Semi-indirect

Question 2 of 22

Question 3 of 22

3. What is the unit of luminous flux?

Lumen

Lumen/m²

Candela

Lux

Question 3 of 22

Question 4 of 22

4. What type of reflector is this?

Soft light type

Dispersive type

Mirror type

Parabolic type

Question 4 of 22

Question 5 of 22

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

Lux

Candela

Steradian

Lumen

Question 5 of 22

Question 6 of 22

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

Leak transformer

High pressure aluminum oxide

Sodium vapor

Arc tube

Question 6 of 22

Question 7 of 22

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

Phosphor powder

Silver oxide

Barium and strontium oxide

Fluorescent powder

Question 7 of 22

Question 8 of 22

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

Vertical

Any position

Horizontal

Inclined

Question 8 of 22

Question 9 of 22

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

Increase lighting effect

Withstand high temperature

Reduce UV radiation

Withstand atmospheric pressure

Question 9 of 22

Question 10 of 22

10. Which is a cold cathode lamp?

Halogen lamp

Mercury vapor lamp

Fluorescent lamp

Neon sign lamp

Question 10 of 22

Question 11 of 22

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

Lumen

Luminous intensity

Candela

Illuminance

Question 11 of 22

Question 12 of 22

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

Increase working voltage

Reduce starting current

Provide initial high voltage ignition

Reduce working voltage

Question 12 of 22

Question 13 of 22

13. What type of lamp is this?

HP metal halide lamp

MA type HPMV lamp

MB type HPMV lamp

MAT type MV lamp

Question 13 of 22

Question 14 of 22

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

Lumen

Illuminance

Luminous flux

Luminous intensity

Question 14 of 22

Question 15 of 22

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

300 mA

50 mA

200 mA

100 mA

Question 15 of 22

Question 16 of 22

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

High melting point

Higher light output

Low power consumption

Low operating voltage

Question 16 of 22

Question 17 of 22

17. 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 17 of 22

Question 18 of 22

18. What is this type of light called?

Bulk light

Flash light

Flood light

Spotlight

Question 18 of 22

Question 19 of 22

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

Decrease starting current

Generate high voltage starting pulse

Increase running voltage

Decrease running current

Question 19 of 22

Question 20 of 22

20. How is evaporation rate reduced in vacuum bulbs?

Producing arc in bulb

Filling with inert gas

Reducing filament resistance

Increasing filament resistance

Question 20 of 22

Question 21 of 22

21. What is the working temperature of filament lamp?

1800°C

2000°C

2300°C

1500°C

Question 21 of 22

Question 22 of 22

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

Direct lighting

Semi-indirect lighting

Semi-direct lighting

Indirect lighting

Question 22 of 22