D.C. Motors

A. self-induced e.m.f.
B. mutually induced e.m.f.
C. back e.m.f
D. none of the above

A. a stronger commutating field is needed at low speed than at high speed
B. a weaker commutating field is needed at low speed than at high speed
C. same commutating field is needed at low speed than at high speed
D. none of the above is correct

A. Plugging
B. Regenerative braking
C. Rheostatic braking
D. None of the above

A. Shunt motors
B. Series motors
C. Compound motors
D. All of the above

A. motor is run as a generator
B. motor is reversed in direction
C. motor is run at reduced speed

A. no-load
B. part load
C. full-load
D. overload

A. Swinburne’s test
B. Hopkinson’s test
C. Field test
D. Brake test

A. stray losses
B. eddy current losses
C. field copper losses
D. windage losses

A. iron losses
B. line losses
C. sparking
D. corona losses

A. yoke
B. commutator
C. armature conductors
D. armature rotor