Electrical Engineering MCQs

Page No. 266

An induction motor can run at synchronous speed when____________?


ait is run on load


bit is run in reverse direction


c it is run on voltage higher than the rated voltage


de.m.f. is injected in the rotor circuit



The low power factor of induction motor is due to___________?


arotor leakage reactance


bstator reactance


cthe reactive lagging magnetizing current necessary to generate the magnetic flux


dall of the above


View Answer all of the above

In induction motor, percentage slip depends on__________?


asupply frequency


bsupply voltage


ccopper losses in motor


dnone of the above



When /?2 is the rotor resistance, .X2 the rotor reactance at supply frequency and s the slip, then the condition for maximum torque under running conditions will be_____________?


asR2X2 = 1


bsR2 = X2


cR2 = sX2


dR2 = s2X2


View Answer R2 = sX2

In case of a double cage induction motor, the inner cage has__________?


a high inductance arid low resistance


b low inductance and high resistance


clow inductance and low resistance


dhigh inductance and high resistance



In an induction motor if air-gap is increased__________?


athe power factor will be low


bwindage losses will be more


cbearing friction will reduce


dcopper loss will reduce In an induction motor



The torque developed by a 3-phase induction motor least depends on__________?


arotor current


brotor power factor


crotor e.m.f.


dshaft diameter


View Answer shaft diameter

Which motor is preferred for use in mines where explosive gases exist ?


aAir motor


bInduction motor


cD.C. shunt motor


dSynchronous motor


View Answer Air motor

Lubricant used for ball bearing is usually___________?


agraphite


bgrease


cmineral oil


dmolasses


View Answer grease

The circle diagram for an induction motor cannot be used to determine____________?


aefficiency


bpower factor


cfrequency


doutput


View Answer efficiency

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