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Three Phase Induction Motors

Three Phase Induction Motors
The full load slip of a 3-phase induction motor ranges from

10 to 20 %
20 to 30 %
None of the listed here
2 to 5 %

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Three Phase Induction Motors
The synchronous speed of a 3-phase induction motor having 20 poles and connected to a 50 Hz source is _____

600 rpm
1200 rpm
1000 rpm
300 rpm

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Three Phase Induction Motors
In a squirrel cage induction motor, the number of stator slots is _______ rotor slots.

Either more or less than the number of
Always less than the number of
Always eqaul to the number of
Always greater than the number of

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Three Phase Induction Motors
Friction and windage loss of a 3 phase induction motor are

Maximum at no load
Minimum at no load
None of the listed here
Remains the same at all loads

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Three Phase Induction Motors
The condition of induction motor at stand still resemble those of a transformer whose secondady is _______

Supplying a variable resistive load
None of the listed here
Short circuited
Open circuited

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Three Phase Induction Motors
Size of a high speed motor as compared to low speed motor for the same HP will be

Any of the listed here
Same
Bigger
Smaller

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