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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