Single Phase Induction Motors

A. equal to full load current
B. less than full load current
C. slightly more than full load current
D. several times the full load current

A. It requires more maintenance of commutator and other mechanical devices
B. It makes quite a bit of noise on starting
C. In fractional horse power motors, it has replaced the capacitor motors
D. It is not easily reversed

A. running winding
B. rotor winding
C. field winding
D. compensating winding

A. smaller brush width
B. less number of field turns
C. more number of armature turns
D. less air gap
E. all of the above

A. it revolves synchronously
B. it is not subject to any magnetic or mechanical vibrations
C. it can be easily manufactured in extremely small sizes of up to 1 W output
D. it develops hysteresis torque which is extremely steady both in amplitude and phase

A. It requires only one winding
B. It can rotate in one direction only
C. It is self-starting
D. It is not self-starting

A. varying field flux with tapped field windings
B. connecting rheostat in series
C. applying variable voltage by means of silicon controlled rectifier
D. applying variable voltage by means of variable auto-transformer
E. all of the above methods

A. It is extremely sensitive to fluctuations in supply voltage
B. Its high starting torque is due to its high rotor hysteresis loss
C. It is extremely quiet in operation
D. It accelerates from rest to full-speed almost instantaneously

A. armature
B. field
C. rotor
D. stator

A. gearing
B. belts
C. brakes
D. chains