Illumination & Wiring

#1. Unit of luminous intensity....?

lumen

lux

candela

lumen/m

incorrect

#2. The most efficient lamp....?

LED

CFL

graphene

sodium vapour lamp

#3. Switch board is fixed at height of ..... as per IE rules?

1.5m

2.5m

2m

3m

#4. How many light points are allowed in one circuit?

15 points

12 points

16 points

10 points

#5. Batten wiring is recommended for which of the following wiring?

industrial

power

permanent

temporary

#6. Earthing is done for providing a path to ground:

high voltage

leakage current

over current

circuit current

#7. Which type of electric lamp is used in cinema projectors?

neon lamp

carbon arc lamp

discharge lamp

incandescent lamp

#8. High pressure mercury vapour lamp emits ....?

white colour light

red colour light

bluish white colour light

yellow colour light

#9. The approximate run time of a battery lamp containing 10x0.25 W LED, running on a 6 V -6AH is...?

12 hours

16 hours

10 hours

14 hours

#10. Which of the following is a suitable copper wire for carrying a current of 50A?

4 mm2

8 mm2

16 mm2

12 mm2

#11. The colour of light depends on...?

speed of light

frequency

speed & frequency of light

wave length

#12. In CTS wiring, CTS stands for....?

core type sheathed

cable type sheathed

core tyre sheathed

cable tyre sheathed

#13. Insulating material of a cable should have....?

low melting point

low mechanical strength

high dielectric strength

low dielectric strength

#14. The strongest half lap joint is....?

corner half lap joint

dovetail half lap joint

crosshalf lap joint

T half lap joint

#15. The type of earthing suitable for sandy areas is....?

strip earthing

rod

plate

pipe

#16. The inner tube of high pressure MV lamp is....?

Halogen lamp

helium lamp

argon gas

nitrogen gas