D.C. Motors

A. 100%
B. around 90%
C. anywhere between 75% and 90%
D. less than 50%

A. shunt motors
B. shunt as well as compound motors
C. shunt, compound and series motors
D. all D.C. motors

A. to improve cooling
B. to reduce copper losses
C. to increase the generated e.m.f.
D. to reduce the sparking

A. Starter for a car
B. Drive for a water pump
C. Fan motor
D. Motor operation in A.C. or D.C

A. Frame
B. Shaft
C. Commutator
D. Stator

A. pumping sets
B. air compressors
C. electric traction
D. machine shops

A. almost negligible
B. rated full-load current
C. less than full-load current
D. more than full-load current

A. back e.m.f. is equal to armature drop
B. armature drop is negligible
C. flux is proportional to armature current
D. flux is practically constant in D:C. shunt motors

A. The motor will stop
B. The motor will continue to run
C. The armature may burn
D. The motor will run noisy

A. up to 5 H.P
B. up to 10 H.P
C. up to 15 H.P
D. up to 20 H.P