1000+ Electrical Machines MCQ Questions and Answers Pdf - 2
Question: 6
In a shunt dc machine, the armature and field winding resistance are respectively
(A) of higher values
(B) of lower values
(C) high and low
(D) low and high
Ans: D
low and high
Question: 7
Dummy coils are used for
(A) mechanical balancing
(B) increasing efficiency
(C) reducing armature reaction
(D) all of the above
Ans: A
mechanical balancing
Question: 8
Which of the following 3 phase connections of a transformer causes interference to the nearby communication system?
(A) star-delta
(B) star-star
(C) delta-star
(D) delta-delta
Ans: B
star-star
Question: 9
The principle of dynamically induced emf is utilized in
(A) generator
(B) transformer
(C) thermocouple
(D) choke
Ans: A
generator
Question: 10
In a transformer, the winding is tapped in the middle
(A) to avoid the radial forces on the windings
(B) to reduce the insulation level of the windings
(C) to provide a mechanical balance to the windings
(D) to eliminate the axial forces on the windings
Ans: D
to eliminate the axial forces on the windings
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