DC Generator Questions and Answers Pdf - 1

Question: 1

Field divertor method of speed control of a dc series motor gives speeds above rated one due to reduction of

(A) Armature current

(B) Armature current

(C) Field current

(D) None of these

Ans: C

Field current

Question: 2

In dc machines, the armature windings are placed on the rotor because of the necessity for

(A) Commutation

(B) Development of torque

(C) Electromechanical energy conversion

(D) Generation of voltage

Ans: A


Question: 3

An exciter for turbo-generator is a dc _____ generator.

(A) Series

(B) Shunt

(C) Separately excited

(D) Compound

Ans: B


Question: 4

The armature of a dc machine is made of silicon steel laminations to

(A) Increase the permeability

(B) Reduce both hysteresis and eddy current loss

(C) Reduce the eddy current loss only

(D) Hysteresis Reduce loss only

Ans: B

Reduce both hysteresis and eddy current loss

Question: 5

The dc motor most suitable for applications requiring high starting torque is

(A) Differential compound

(B) Cumulative compound

(C) Shunt

(D) Series

Ans: D


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