Polyphase Induction Motors - Study Mode
[#86] If an induction motor with certain ratio of rotor to stator slots, runs at $$frac{1}{7}$$ of the normal speed, the phenomenon will be termed as
Correct Answer
(C) Crawling
[#87] The 'cogging' of an induction motor can be avoided by
Correct Answer
(D) Having number of rotor slots more or less than the number of stator slots (not equal)
[#88] The power scale of circle diagram of an induction motor can be found from
Correct Answer
(C) Short-circuit test only
[#89] In a three-phase induction motor, the number of poles in the rotor winding is always
Correct Answer
(D) Equal to number of poles in stator
[#90] Which type of bearing is provided in small induction motors to support the rotor shaft?
Correct Answer
(A) Ball bearings