Electrical Engineering Questions And Answers :: Polyphase Induction Motors: part4

Electrical Engineering : Polyphase Induction Motors QUESTIONS AND ANSWERS :: part4 : 1 to 5

Following Electrical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2021 and IES 2021 examinations :

1.The purpose of using short-circuit gear is

to short circuit the rotor at slip rings
to short circuit the starting resis�tances in the starter
to short circuit the stator phase of motor to form star
none of the above

2.Insertion of resistance in the rotcir of an induction motor to develop a given torque

decreases the rotor current
increases the rotor current
rotor current becomes zero
rotor current rernains same

3.Insertion of resistance in the stator of an induction motor

increases the load torque
decreases the starting torque
increases the starting torque
none of the above

4.The rotor of an induction motor runs at

synchronous speed
below synchronous speed
above synchronous speed
any of the above

5.The low power factor of induction motor is due to

rotor leakage reactance
stator reactance
the reactive lagging magnetizing current necessary to generate the magnetic flux
all of the above

More Polyphase Induction Motors QUESTIONS AND ANSWERS available in next pages

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