Single Phase Induction Motors

A. voltage rating
B. dielectric medium
C. polarity marking
D. definite value

A. spark excessively
B. have poor efficiency
C. have poor power factor
D. all of the above

A. can be operated either on D.C. or A.C. supply at approximately the same speed and output
B. can be marketed internationally
C. runs at dangerously high speed on no-load

A. through resistance
B. through reactances
C. through capacitors
D. solidly

A. slip rings
B. commutator
C. both A. and (b)
D. none of the above

A. Repulsion motor
B. Repulsion induction motor
C. Repulsion start induction run motor
D. None of the above

A. It cannot be reversed, ordinarily
B. It requires no D.C. field excitation for its operation
C. It is nothing else but a single-phase, salient pole synchronous-induction motor
D. Its squirrel cage-rotor is of unsym-metrical magnetic construction in order to vary reluctance path between stator and rotor

A. centrifugal switch
B. capacitor
C. commutator
D. all of the above

A. disconnect motor from the supply till it stops then reconnect it to supply with reversed connection of main or auxiliary winding
B. disconnect motor from supply and immediately reconnect it to supply with reversed connections of the main winding
C. reverse the direction of connection of the auxiliary winding and after motor comes to rest then connect auxiliary winding to the supply
D. reverse the direction of connections of the auxiliary winding and immediately connect it to supply

A. become unstable
B. draw excessive armature current and may burn out
C. fall out of synchronism and come to stand still
D. run as induction motor