Electrical Engineering MCQs

Page No. 268

The vafcie of transformation ratio of an induction motor can be found by__________?


aopen-circuit test only


bshort-circuit test only


cstator resistance test


dnone of the above



In a three-phase induction motor__________?


apower factor at starting is high as compared to that while running


bpower factor at starting is low as compared to that while running


c power factor at starting in the same as that while running


dNone



In three-phase induction motors sometimes copper bars are placed deep in the rotor to___________?


aimprove starting torque


breduce copper losses


cimprove efficiency


dimprove power factor



Which is of the following data is required to draw the circle diagram for an induction motor ?


aBlock rotor test only


bNo load test only


cBlock rotor test and no-load test


dBlock rotor test, no-load test and stator resistance test



In case of 3-phase induction motors, plugging means__________?


apulling the motor directly on line without a starter


blocking of rotor due to harmonics


cstarting the motor on load which is more than the rated load


dinterchanging two supply phases for quick stopping



In a three-phase induction motor_______________?


airon losses in stator will be negligible as compared to that in rotor


biron losses in motor will be neg¬ligible as compared to that in rotor


ciron losses in stator will be less than that in rotor


diron losses in stator will be more than that in rotor



Short-circuit test on an induction motor cannot be used to determine___________?


awindage losses


bcopper losses


c transformation ratio


dpower scale of circle diagram


View Answer windage losses

The starting torque of a 3-phase squirrel cage induction motor is____________?


atwice the full load torque


b1.5 times the full load torque


cequal to full load torque


dNone of them



A 3-phase slip ring motor has____________?


adouble cage rotor


b wound rotor


cshort-circuited rotor


dany of the above


View Answer wound rotor

5 H.P., 50-Hz, 3-phase, 440 V, induction motors are available for the following r.p.m. Which motor will be the costliest ?


a730 r.p.m.


b960 r.p.m.


c1440 r.p.m.


d 2880 r.p.m.


View Answer 730 r.p.m.

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