Single Phase Induction Motors

A. hard and annealed bearings
B. ball or roller bearings
C. soft and porous bearings
D. plain or sleeve bearings

A. open armature winding
B. shorted armature winding
C. shorted field winding”
D. high commutator mica
E. all of the above

A. It is similar to reluctance motor
B. It is basically an induction motor and not a synchronous one
C. So far as its basic working principle is concerned, it is similar to shaded pole motor
D. the air-gap between rotor and salient poles is non- uniform

A. run faster
B. spark at light loads
C. draw excessive current and overheat
D. run slower

A. motor will not come up to speed
B. motor will not carry the load
C. current drawn by the motor will be excessively high
D. electrolytic capacitor will, in all probability, suffer break down

A. It is a reversing motor
B. It is preferred to permanent-split single-value capacitor motor where frequent reversals are required
C. It has low starting as well as rushing currents
D. It has high starting torque

A. worn bearings
B. short-circuit in the winding
C. open-circuit in the winding
D. none of the above

A. it is comparatively cheaper
B. it has almost non-destructible capacitor
C. it has low starting as well as running currents at relatively high power factor
D. it is quiet in operation

A. Hysteresis motor
B. Reluctance motor
C. Capacitor-run motor
D. Universal motor

A. magnetic relay
B. thermal relay
C. centrifugal switch
D. none of the above