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Three Phase Induction Motors

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

Cast iron
Carbon steel
Stainless steel
High speed steel

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

Large slip
Low resistance
High reactance
high resistance

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Three Phase Induction Motors
If the air gap between the rotor and stator of a 3-phase induction motor is increased, then_______

Leakage reactances are increased
Leakage reactances are decreased
None of the listed here
No load current is decreased

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Three Phase Induction Motors
The frequency of rotor current in a 6-pole , 50 Hz, 3-phase induction motor running at 950 rpm is

0.05 Hz
2.5 Hz
1.5 Hz
5 Hz

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Three Phase Induction Motors
If any two phases for an induction motor are interchanged

The motor will not run
The motor will run in reverse direction
The motor will run at reduced speed
The motor will burn

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

Silicon steel
Aluminium
Bronze
Cast iron

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