Polyphase Induction Motors

A. speed control is required
B. frequent starting, stopping and reversing is required
C. high starting torque is needed
D. all above features are required

A. stator slots are equal to rotor slots
B. stator slots are exact multiple of rotor slots
C. stator slots are not exact multiple of rotor slots
D. none of the above

A. inadequate motor wiring
B. poorely regulated power supply
C. any one of the above
D. none of the above

A. will continue running burning its one phase
B. will continue running burning its two phase
C. will stop and carry heavy current causing permanent damage to its winding
D. will continue running without any harm to the winding

A. will continue running burning its one phase
B. will continue running burning its two phases
C. will stop and carry heavy current causing permanent damage to its winding
D. will continue running without any harm to the winding

A. bigger
B. smaller
C. same
D. any of the above

A. magnetic field and rotor rotate in opposite direction
B. rotor speed is less than the synchronous speed of the field and are in the same direction
C. rotor speed is more than the synchronous speed of the field and are in the same direction
D. none of the above

A. humming
B. hunting
C. crawling
D. cogging

A. proper ventilation
B. using DOL starter
C. auto-transformer starter
D. having number of rotor slots more or less than the number of stator slots (not equal)

A. 0.2 lagging
B. 0.2 leading
C. 0.5 leading
D. unity