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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