Electrical Engineering MCQs

Page No. 266

An induction motor can run at synchronous speed when____________?


ait is run on load

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bit is run in reverse direction

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c it is run on voltage higher than the rated voltage

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

✓



The low power factor of induction motor is due to___________?


arotor leakage reactance

✖


bstator reactance

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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

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In an induction motor if air-gap is increased__________?


athe power factor will be low

✓


bwindage losses will be more

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cbearing friction will reduce

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dcopper loss will reduce In an induction motor

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


arotor current

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brotor power factor

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crotor e.m.f.

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dshaft diameter

✓


View Answer shaft diameter

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


aAir motor

✓


bInduction motor

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cD.C. shunt motor

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dSynchronous motor

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View Answer Air motor

Lubricant used for ball bearing is usually___________?


agraphite

✖


bgrease

✓


cmineral oil

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dmolasses

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View Answer grease

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


aefficiency

✓


bpower factor

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cfrequency

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doutput

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View Answer efficiency

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