DC Generators MCQ Questions Answers Electrical Engineering

DC Generators MCQ Questions Answers – Electrical Engineering


1) The brush voltage drop in a d.c. machine is about …………

a) 0.1 V

b) 10 V

c) 2 V

d) 20 V

View Answer
Option – c)

2) Small d.c. machines generally have ………poles.

a) 4

b) 6

c) 2

d) 8

View Answer
Option – c)

3) …….. d.c. machines are most common.

a) 2-pole

b) 4-pole

c) 6-pole

d) 8-pole

View Answer
Option – b)

4) A triplex wave winding will have ……… parallel paths.

a) 6

b) 2

c) 4

d) none of the above

View Answer
Option – a)

5) High-voltage d.c. machines use …….. winding.

a) lap

b) wave

c) either lap or wave

d) none of the above

View Answer
Option – b)

6) The yoke of a d.c. machine carries ,…….. pole flux.

a) the

b) one-half of the

c) two times the

d) none of the above

View Answer
Option – b)

7) The commutator pitch for a simplex lap winding is equal to …….

a) number of poles of the machine

b) pole pairs

c) 1

d) none of the above

View Answer
Option – c)

8) The greatest percentage of heat loss in a d.c. machine is due to ……….

a) eddy current loss

b) hysteresis loss

c) copper loss

d) frictional loss

View Answer
Option – c)

9) The armature conductors of 6-pole, lap wound d.c. generator are divided into

a) 2 parallel paths

b) 4 parallel paths

c) 3 parallel paths

d) 6 parallel paths

View Answer
Option – d)

10) Hysteresis loss in a d.c. machine is directly proportional to ……….

a) speed

b) (speed)2

c) (speed)6

d) none of the above

View Answer
Option – a)

11) The greatest percentage of heat loss in a d.c. machine is due to ,……..

a) eddy current loss

b) hysteresis loss

c) copper loss

d) frictional loss

View Answer
Option – c)

12) The filed winding of a d.c. shunt machine usually carries …… of the rated current of the machine.

a) 2% to 5%

b) 15 % to 20%

c) more than 20%

d) less than 0.5%

View Answer
Option – a)

13) The commutator of a d.c. generator acts as

a) an amplifier

b) a rectifier

c) a load

d) none of the above

View Answer
Option – b)

14) The armature copper loss in a d.c. generator is a

a) constant loss

b) variable loss

c) stray loss

d) none of the above

View Answer
Option – b)

15) The ideal commutation in a coil is not possible because each coil has

a) resistance

b) inductance

c) capacitance

d) none of the above

View Answer
Option – b)

16) The commutator in a d.c. machine can convert

a) a.c. to d.c.

b) d.c. to a.c.

c) both (i) and (ii)

d) none of the above

View Answer
Option – c)

17) Fleming’s right hand rule is applicable to

a) d.c. motor

b) alternator

c) transformer

d) d.c. generator

View Answer
Option – d)
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