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Three Phase Induction Motors

Three Phase Induction Motors
In the circle diagram for induction motor, the diameter of the circle represents

Line voltage
Running torque
Slip
Rotor current

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Three Phase Induction Motors
The frame of an induction motor is usually made of

Bronze
Silicon steel
Cast iron
Aluminium

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Three Phase Induction Motors
The maximum torque of a 3-phase induction motor under running conditions is

Inveresly proportional to supply voltage
inversely proportional to rotor reactance at standstill
Directly proportional to rotor resistance
None of the listed here

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

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

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Three Phase Induction Motors
In medium sized induction motor, the slip is generally around

4 %
0.04 %
14%
0.4 %

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Three Phase Induction Motors
The starting torque of a squirrel cage induction motor is

Slightly more than full load torque
Same as full load torque
Low
Negligible

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