7000+ DC Machines Multiple Choice Questions with Answers - 1

Question: 1

The emf induced in a conductor rotating in a bipolar field is

(A) AC

(B) DC

(C) DC and AC both

(D) None of these

Question: 2

The output power of any electrical motor is taken from the

(A) Coupling mounted on the shaft

(B) Motor frame

(C) Field

(D) Armature

Question: 3

Which motor should not be used for centrifugal pumps?

(A) Cumulatively compound

(B) Differentially compound

(C) Shunt

(D) Series

Question: 4

Which of the following are the variable losses in a rotating machine?

(A) Copper loss and stray load loss

(B) Copper loss and core los

(C) Core loss and stray load loss

(D) Core loss and mechanical loss

Question: 5

A dc generator will be flat compounded if

(A) Terminal voltage increases slightly with the load

(B) The generator is capable of producing higher voltage at light load

(C) Generated voltage is in proportion to lead current

(D) Its terminal voltage remain constant irrespective of the load current supplied by the generator