2018 FEBRUARY ELECTRICIAN THEORY SEMESTER-3

2018 FEBRUARY   ELECTRICIAN THEORY SEMESTER-3

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

26. Gas filled in a tube starter

 is ....
a) Argon
b) Helium

c) Neon

d) None of these

Answer:- b) Helium

27. Condenser is used in tube

circuit to ......

a) To improve the P.F

b) To improve the voltage

c) To safeguard the tube

d) To give full light

Answer:- a) To improve the P.F

28. The inner side colour of the

Reflector is .......

a) Black

b) White

c) Any Dark

d)None of these

Answer:- b) White

29. In a power house, Illumination

should be approximately.......

a) 20-40 Lumen/M²

b) 80-90 Lumen/M²

c) 100-150 Lumen/M²

d) 200-250 Lumen/M²

Answer:- c) 100-150 Lumen/M²

30. In parking lots, illumination

height should be approximately
a) 8 Lumen/M³

 b) 10 Lumen/M³

c) 12 Lumen/M³

d) 80 Lumen/M³

Answer:- c) 12 Lumen/M³

31. When a rotating machine

 is observed under a gas discharge

lamp, it appear to be cither stationary

or seams to be running in reverse

direction. What is reason for it .......?

a) Argon

b) Helium

c) Neon

d) None of these

Answer:- d) None of these

32. The circuit of tube starter

has condenser which ......

a) Reduce the spark

b) Improves power factor

c) Limit the current

d) Reduce the stroboscope effect

Answer:- a) Reduce the spark

33. The diameter of electrode in

a D.C arc lamp is .....

a) Positive electrode very thick

b) Negative electrode very thick

c) Positive electrode very thin

d) Both similar

Answer:- a) Positive electrode

                     very thick

34. Voltage used in D.C arc

lamp is.......

a) 40-60V

b)80-110V

c) 180-210 V

d) 220-250 V

Answer:- a) 40-60V

35. The threaded portion on the

outer side of the edison screw

type lamp holder should be
connected with ........

a) Neutral wire of the circuit

b) Phase wire of the circuit

c) Half wire of the circuit

d) Earth wire of the circuit

Answer:- a) Neutral wire of the

                     circuit

36. The working temperature

of a gas filled tungsten filament

 lamp is ........
a) 1035°c

b) 1200°c

c) 1500°c

d)2300°c

Answer:- d)2300°c

37. Rotary converter is

generally available in .....

a) Single phase

b) Three phase

c) Both (a) & (b)

d) Twelve phase

Answer:- b) Three phase

38. Mercury arc rectifier

anodeis made up of ....

a) Carbon

b) Graphite

c) Both(a)&(b)

d) None of these

Answer:- b) Graphite

39. ......... is also known

as hote cathode rectifier.

a) Copper oxide rectifier

b) Tunger bulb rectifier

c) Mercury arc rectifier

d) None of these

Answer:- a) Copper oxide rectifier

40. Machine which converts

A.C into D.C is known as ......

a) Convener

b) Inverter

c) Both (a) & (b)

d) None of these

Answer:- a) Convener

41. In a full wave rectifier,

ripple frequency is equal

to ........

a) 2 F input

b) 3 F input

c) Both (a) & (b)

d) None of these

Answer:- a) 2 F input

42. Which method is used to

make a full wave rectifier?

a) Bridge method

b) Center tap method

c) Both(a)&(b) 

d) None of these

Answer:- c) Both(a)&(b) 

43. Rectification is of how

many types .......

a) One

b)Two
c) Three

d) Four

Answer:- b)Two

44. The supply in Growler

is ......

a) DC

b) AC

c) Both (a) & (b)

d) None of these

Answer:- b) AC

45. The number of coils per

group in balanced winding

 is .........

a) Same

b) Unequal

c) Both (a) & (b)

d) None o f these

Answer:- a) Same

46. The mostly used winding

for rewinding is ........

a) Basket winding

b) Chain winding

c) Concentric winding

d) None of these

Answer:- a) Basket winding

47. For earth with testing volt meter

when connected to commutator

segment and body of an amature,

the growler is connected to A.C.

supply. The milli voltmeter should

read .......

a) No reading

b) Low reading

c) Infinity

d) More reading

Answer:- c) Infinity

48. The number of slots with

respect of number of coils in

double layer  winding is ....
a) Same

b) Less

c) More than one

d) Half

Answer:- a) Same

49. Pitch factor in full pitch

winding is .......

a) One

b) Less than one

c) More than one

d) None of these

Answer:- a) One

50. The numbers of windings in

double  cage induction motors
a) One

b)Two
c) Three

d)Four

Answer:- b)Two