Polyphase Induction Motors

A. high loads
B. low voltage supply
C. improper design of machine
D. harmonics developed in the motor

A. changing supply frequency
B. changing number of poles
C. changing winding resistance
D. reducing supply voltage

A. low horsepower motors
B. variable speed motors
C. high horsepower motors
D. high speed motors

A. zero
B. more than the number of poles in stator
C. less than number of poles in stator
D. equal to number of poles in stator

A. rotor conductor ends are short-circuited through slip rings
B. rotor conductors are short-circuited through end rings
C. rotor conductors are kept open
D. rotor conductors are connected to insulation

A. frequency
B. rotor inductive reactance
C. square of supply voltage
D. all of the above

A. self-starting with zero torque
B. self-starting with high torque
C. self-starting with low torque
D. non-self starting

A. the motor will run in reverse direction
B. the motor will run at reduced speed
C. the motor will not run
D. the motor will burn

A. squirrel-cage induction motors only
B. slip ring induction motors only
C. both A. and (b)
D. none of the above

A. Squirrel-cage induction motor
B. Slip-ring induction motor
C. Both A. and (b)
D. None of the above