1000+ Electrical Machines Questions and Answers Pdf - 2

Question: 6

Armature winding is one in which working

(A) emf is produced by the leakage flux

(B) flux is produced by field current

(C) flux is produced by the working emf

(D) emf is produced by the working flux

Question: 7

In which of the following, voltage regulation may be zero or negative

(A) unity power factor

(B) lagging power factor

(C) leading power factor

(D) all of the above

Question: 8

The armature voltage control is considered suitable for a DC motor driven at constant

(A) current

(B) torque

(C) power

(D) speed

Question: 9

DC series motors are used

(A) where operating speed is variable and starting torque is high

(B) where load constant

(C) where constant operating speed is needed

(D) where load changes operating frequently

Question: 10

Air exhibits

(A) antiferromagnetism

(B) diamagnetism

(C) paramagnetism

(D) ferromagnetism