FEB 2018

ELECTRICIAN THEORY

SEMESTER-3

PART-1

1. Which type of pitch is commonly

used due to its advantages

during rewinding
a) Short pitch

b) Long pitch

c) Full pitch

d) None of these

Answer:- a) Short pitch

2. Mostly field used in three phase

stator rewinding is_

a) Flat Loop

b) Basket

c) Chain

d) None of these

Answer:- b) Basket

3. The Unit of luminous flux is-

a) Candale Power

b) Lux

c) Lumen

d) Meter Candle

Answer:- c) Lumen

4. The unit of luminous intensity is__

a) Candale Power

b) Lumen

c) Lume Flux

d) None of these

Answer:- a) Candale Power

5. The unit of soild angle is_.

a) Degree

b) Steradian

c) Radian

d) Candale

Answer:- b) Steradian

6. Which lamp is generally used for

lighting purpose ......?

a) Carbon filament Lamp

b) Arc lamp

c) Tungsten filament lamp

d) All of these

Answer:- c) Tungsten filament lamp

7. Carbon Filament Lamp is

used for-

a) Lighting .

b) Battery' Charging

c) Projectors

d) Indicating

Answer:- b) Battery' Charging

8. Which Lamp is used in the

cinema Projectors?

a) Carbon arc lamp

b) Carbon filament lamp

c) Neon lamp

d) Gas discharge lamp

Answer:- a) Carbon arc lamp

9. In a mercury vapour lamp

which gas is filled?

a) Hydrogen

b) Argon

c) Helium

d) Neon

Answer:- b) Argon

10. The Function of auxiliary

electrode in a Mercury vapour

lamp is .........
a) Starting Purposes

b) To drop the voltage

c) To reduce the current

d) Gives more Light

Answer:- a) Starting Purposes

11. Mercury vapour lamps are

made in ............

a) MAT MA and A.B.T type

b) M.A M.B And M.A.T type

c) M.B.T B.C.T and A.B.T type

d) None of these

Answer:- b) M.A M.B And M.A.T type

12. The working temperature of

high pressure mercury vapour

lamp is .........
a) 600°  

b)680°
c) 800°

d) 1200°

Answer:- a) 600°  

13. The sodium vapour lamp has ........

a) Neon gas

b) Helium

c) Hydrogen

d) Nitrogen

Answer:- a) Neon gas

14. Sodium vapour has two

electrodes  .......

a) Oxide coated tungsten

b) Oxide coated carbon

c) Oxide coated nichrome

d) Oxide coated eureka

Answer:- a) Oxide coated tungsten

15. The colour of sodium

vapour lamp light is ......

a) Blue

b)Red
c) Yellow

d) White

Answer:- c) Yellow

16. The working temperature of

sodium vapour is .........

a) 250° C

b) 300°C

c) 450° C

d) 60° C

Answer:- b) 300°C

17. Which lamp takes more time

for giving full light?

a) Sodium vapour lamp

b) Mercury vapour lamp

c) Tungsten filament lamp

d) Neon lamp

Answer:- a) Sodium vapour lamp

18. A sodium vapour

 lamp  has ..........

a) 20-30 lumen/watts

b) 40-50 lumen/watts

c) 55-75 lumen/watts

d) 85-105 lumen/watts

Answer:- d) 85-105 lumen/watts

19. Sodium vapour lamp has

how  much ionization

potential .......
a) 5.12 V

b)6.2 V

c) 6.76 V

d) 7.2 V

Answer:- a) 5.12 V

20. The fluorescent tube

has ...........
a) Mercury vapour
c) Mercury & Argon

b) Neon

d) Helium& Mercury

Answer:- b) Neon

21. The main function of

Choke in a fluorescent tube

a) Induce surge voltage at the

     time of starting

b) To drop the voltage

c) To improve the P.F

d) To induce high voltage and

     limit the current

Answer:- d) To induce high

voltage and limit the current

22. In running condition,

voltage across starter is ...

a) 110 V

b) 180 V

c) 220 V

d) Zero .

Answer:- a) 110 V

23. The light efficiency of

fluorescent tube is .......

a) 40 lumen/watts

b) 45 lumen/watts

c) 60 lumen/watts

d) 75 lumen/watts

Answer:- c) 60 lumen/watts

24. lamp gives direct light when

its filament is heated.

a) Incandescent lamp

b) Gas discharge lamp

c) Neon lamp

d) Arc lamp

Answer:- a) Incandescent lamp

25. The diameter of 40 Watt tube

is .........

a) 12mm

b) 25 mm

c) 30mm

d) 38 mm

Answer:- d) 38 mm