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
2) Small d.c. machines generally have ………poles.
a) 4
b) 6
c) 2
d) 8
3) …….. d.c. machines are most common.
a) 2-pole
b) 4-pole
c) 6-pole
d) 8-pole
4) A triplex wave winding will have ……… parallel paths.
a) 6
b) 2
c) 4
d) none of the above
5) High-voltage d.c. machines use …….. winding.
a) lap
b) wave
c) either lap or wave
d) none of the above
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
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
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
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
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