DC Motors MCQ - Electrician (Set-1) with Answers

DC Motors MCQ - Electrician (Set-1) with Answers

1) A force will act on a conductor placed in a magnetic field when :

Answer is:

a current is flowing in the conductor

Explanation:

.

2) The back e.m.f, opposes :

Answer is:

applied e.m.f.

3) Back e.m.f. is developed in the armature due to :

Answer is:

intersection of the magnetic flux by the armature conductors

4) If in a shunt motor the applied e.m.f. is kept constant then on increasing the load, the shunt-field strength will become _____ its normal value.

Answer is:

equal to

5) In a series motor, the magnetic field-flux stands :

Answer is:

proportional to armature current