1000+ Electrical Machines MCQ Questions and Answers Pdf - 1

Question: 1

Which of the following quantity maintains the same direction whether d.c. machine runs as a generator or as a motor?

(A) supply current

(B) field current

(C) induced emf

(D) armature current

Question: 2

A single phase reluctance motor

(A) has salient pole structure and runs at synchronous speed

(B) has non salient pole rotor structure and runs at synchronous speed

(C) has salient pole rotor structure and runs at sub synchronous speed

(D) speed has salient pole rotor structure and runs at super synchronous

Question: 3

The slot edges in a DC machine are made of

(A) mild steel

(B) silicon steel

(C) fibre

(D) cast iron

Question: 4

A hysteresis motor

(A) needs dc excitation

(B) cannot be run in reverse speed

(C) is not a self starting motor

(D) is a constant speed motor

Question: 5

Potier reactance of an alternator is almost the same as

(A) armature leakage reactance

(B) total armature reactance

(C) field winding reactance

(D) leakage reactance of field winding