Hamad Polyphase Induction Motors 02/12/2020 A. noload test B. blocked rotor test C. stator resistance test D. all of the above Related Mcqs: A 3-phase 440 V, 50 Hz induction motor has 4% slip. The frequency of rotor e.m.f. will be____________?A. 200 Hz B. 50 Hz C. 2 Hz D. 0.2 Hz... Which of the following methods is easily applicable to control the speed of the squirrel-cage induction motor _____________?A. By changing the number of stator poles B. Rotor rheostat control C. By operating two motors in cascade D. By injecting e.m.f. in the rotor circuit... The speed of a squirrel-cage induction motor can be controlled by all of the following except_____________?A. changing supply frequency B. changing number of poles C. changing winding resistance D. reducing supply voltage... Short-circuit test on an induction motor cannot be used to determine___________?A. windage losses B. copper losses C. transformation ratio D. power scale of circle diagram... In an induction motor if air-gap is increased__________?A. the power factor will be low B. windage losses will be more C. bearing friction will reduce D. copper loss will reduce In an induction motor...
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