Explore topic-wise MCQs in Electrical Engineering Questions.

This section includes 121 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.

101.

The e.m.f. generated by a shunt wound D.C. generator isE. Now while pole flux remains constant, if the speed of the generator is doubled, the e.m.f. generated will be_______________?
A. E/2
B. 2E
C. slightly less than E
D. E
Answer» C. slightly less than E
Discussion
102.

In a D.C. generator the number of mechanical degrees and electrical degrees will be the same when____________?
A. r.p.m. is more than 300
B. r.p.m. is less than 300
C. number of poles is 4
D. number of poles is 2
Answer» E.
Discussion
103.

D.C. series generator is used_________________?
A. to supply traction load
B. to supply industrial load at constant voltage
C. voltage at the toad end of the feeder
D. for none of the above purpose
Answer» D. for none of the above purpose
Discussion
104.

An exciter for a turbo generator is a_____________?
A. separately excited generator
B. shunt generator
C. series generator
D. compound generator
Answer» C. series generator
Discussion
105.

Satisfactory commutation of D.C. machines requires______________?
A. brushes should be of proper grade and size
B. brushes should smoothly run in the holders
C. smooth, concentric commutator properly undercut
D. all of the above
Answer» E.
Discussion
106.

Lap winding is composed of_____________?
A. any even number of conductors
B. any odd number of conductors
C. that even number which is exact multiple of poles + 2
D. that even number which is exact multiple of poles
Answer» B. any odd number of conductors
Discussion
107.

Interpole flux should be sufficient to_____________?
A. neutralise the commutating self induced e.m.f.
B. neutralise the armature reaction flux
C. neutralise both the armature reaction flux as well as commutating e.m.f. induced in the coil
D. perform none of the above functions
Answer» D. perform none of the above functions
Discussion
108.

In case of a flat compounded generator:
A. voltage generated is less than the rated voltage
B. generated voltage is proportional to the load on the generator
C. voltage remains constant irrespective of the load
D. speed varies in proportion to the load on the generator
Answer» D. speed varies in proportion to the load on the generator
Discussion
109.

Following D.C. generator will be in a position to build up without any residual magnetism in the poles______________?
A. series generator
B. shunt generator
C. compound generator
D. self-excited generator
Answer» E.
Discussion
110.

Which of the following D.C. generators will be in a position to build up without any residual magnetism in the poles?
A. Series generator
B. Shunt generator
C. Compound generator
D. None of the above
Answer» E.
Discussion
111.

D.C. generator generally preferred for charging automobile batteries is______________?
A. series generator
B. shunt generator
C. long shunt compound generator
D. any of’the above
Answer» D. any of’the above
Discussion
112.

In a D.C. generator in case the resistance of the field winding is increased, then output voltage will____________?
A. increase
B. decrease
C. remain unaffected
D. fluctuate heavily
Answer» C. remain unaffected
Discussion
113.

Which of the following generator will have negligible terminal voltage while running on no-load?
A. Series generator
B. Shunt generator
C. Compound generator
D. Separately excited generator
Answer» B. Shunt generator
Discussion
114.

Permeance is the reciprocal of______________?
A. flux density
B. reluctance
C. ampere-turns
D. resistance
Answer» C. ampere-turns
Discussion
115.

Open circuited armature coil of a D.C. machine is________________?
A. identified by the scarring of the commutator segment to which open circuited coil is connected
B. indicated by a spark completely around the commutator
C. both A. and (b)
D. none of the above
Answer» D. none of the above
Discussion
116.

For the parallel operation of two or more D.C. compound generators, we should ensure that_______________?
A. voltage of the incoming generator should be same as that of bus bar
B. polarity of incoming generator should be same as that of bus bar
C. all the series fields should be run in parallel by means of equilizer connection
D. series fields of all generators should be either on positive side or negative side of the armature
E. all conditions mentioned above should be satisfied
Answer» E. all conditions mentioned above should be satisfied
Discussion
117.

The terminal voltage of a series generator is 150 V when the load current is 5 A. If the load current is increased to 10 A, the terminal voltage will be____________?
A. 150 V
B. less than 150 V
C. greater than 150 V
D. none of the above
Answer» D. none of the above
Discussion
118.

The open circuit voltage of a compound generator is 250 V. At full load the terminal voltage____________?
A. will be less than 250 V
B. will always be 250 V
C. may be greater or less than 250 V
D. none of the above
Answer» D. none of the above
Discussion
119.

A shunt generator can self-excite:_________________?
A. only if the resistance of the field circuit is less than critical value
B. only if the resistance of the field circuit is greater than critical value
C. irrespective of the value of the resistance in the field circuit
D. none
Answer» B. only if the resistance of the field circuit is greater than critical value
Discussion
120.

With a D.C. generator which of the following regulation is preferred ?
A. 100% regulation
B. infinite regulation
C. 50% regulation
D. 1% regulation
Answer» E.
Discussion
121.

A D.C. generator works on the principle of____________?
A. Lenz’s law
B. Ohm’s law
C. Faraday’s law of electromagnetic induction
D. none of the above
Answer» D. none of the above
Discussion