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Three Phase Induction Motors

Three Phase Induction Motors
The number of slip rings on a squirrel cage induction motor is usually

Two
Three
One
None

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Three Phase Induction Motors
When a 3-phase induction motor is at no load, the slip is ______

1
0.2
0.5
Practically zero

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Three Phase Induction Motors
In induction motor, percentage slip depends on

Supply voltage
Supply frequency
Copper losses in motor
None of these

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Three Phase Induction Motors
The 3- phase induction motor is so designed that the rotor should have ______ under running conditions.

Low resistance
High reactance
Large slip
high resistance

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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
None of the listed here
Directly proportional to rotor resistance

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

Cast iron
Bronze
Aluminium
Silicon steel

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