ELECTRICIAN 1st YEAR MODULE – Illumination

Question 1 of 22

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

Barium and strontium oxide

Fluorescent powder

Phosphor powder

Silver oxide

Question 1 of 22

Question 2 of 22

2. Which lighting design type is glare-free?

Semi-direct

Semi-indirect

Indirect

Direct

Question 2 of 22

Question 3 of 22

3. Which is a cold cathode lamp?

Halogen lamp

Neon sign lamp

Mercury vapor lamp

Fluorescent lamp

Question 3 of 22

Question 4 of 22

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

Decrease starting current

Increase running voltage

Decrease running current

Generate high voltage starting pulse

Question 4 of 22

Question 5 of 22

5. What is the unit of luminous efficiency?

Lumen

Lumen/m²

Lumen/watt

Lux

Question 5 of 22

Question 6 of 22

6. What is the working temperature of filament lamp?

1500°C

1800°C

2300°C

2000°C

Question 6 of 22

Question 7 of 22

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

Higher light output

Low power consumption

Low operating voltage

High melting point

Question 7 of 22

Question 8 of 22

8. What type of lamp is this?

MAT type MV lamp

MB type HPMV lamp

HP metal halide lamp

MA type HPMV lamp

Question 8 of 22

Question 9 of 22

9. What type of reflector is this?

Mirror type

Soft light type

Parabolic type

Dispersive type

Question 9 of 22

Question 10 of 22

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

300 mA

100 mA

200 mA

50 mA

Question 10 of 22

Question 11 of 22

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

Sodium vapor

High pressure aluminum oxide

Arc tube

Leak transformer

Question 11 of 22

Question 12 of 22

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

Semi-indirect lighting

Direct lighting

Semi-direct lighting

Indirect lighting

Question 12 of 22

Question 13 of 22

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

Any position

Inclined

Vertical

Horizontal

Question 13 of 22

Question 14 of 22

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

Lumen

Lux

Candela

Steradian

Question 14 of 22

Question 15 of 22

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

Reduce starting current

Reduce working voltage

Provide initial high voltage ignition

Increase working voltage

Question 15 of 22

Question 16 of 22

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

Capacitor in series with one tube

Capacitor parallel to supply

Capacitor in series with supply

Two capacitors in series (one per tube)

Question 16 of 22

Question 17 of 22

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

Withstand atmospheric pressure

Withstand high temperature

Reduce UV radiation

Increase lighting effect

Question 17 of 22

Question 18 of 22

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

Luminous flux

Illuminance

Luminous intensity

Lumen

Question 18 of 22

Question 19 of 22

19. What is this type of light called?

Spotlight

Flood light

Bulk light

Flash light

Question 19 of 22

Question 20 of 22

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

Lumen

Illuminance

Candela

Luminous intensity

Question 20 of 22

Question 21 of 22

21. How is evaporation rate reduced in vacuum bulbs?

Increasing filament resistance

Producing arc in bulb

Filling with inert gas

Reducing filament resistance

Question 21 of 22

Question 22 of 22

22. What is the unit of luminous flux?

Lumen

Lumen/m²

Candela

Lux

Question 22 of 22