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Three Phase Induction Motors

Three Phase Induction Motors
An induction motor is so called because its operation depends on

Mutual induction
Self induction
Eddy currents
Hysteresis

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Three Phase Induction Motors
If the supply voltage of a 3-phase induction motor is increased two times, then torque is _______

Increased four times
Decreased four times
Decreased two times
Increased two times

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Three Phase Induction Motors
The cogging of an induction motor can be avoided by

Having number of rotor slots more or less than the number of stator slots
Auto transformer starter
Proper ventilation
Using DOL starter

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Three Phase Induction Motors
The shaft of induction motor is made of

Any of the listed here
Hollow
Flexible
Stiff

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Three Phase Induction Motors
Very large 3-phase induction motors (greater than 25 HP) are started _____

Star-delta starting
None of the listed here
Direct on line
By auto transformer starting

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Three Phase Induction Motors
A high starting torque can be obtained in a 3phase induction motor by _______

Increasing rotor reactance
Increasing rotor resistance
Decreasing rotor resistance
None of the listed here

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