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Three Phase Induction Motors

Three Phase Induction Motors
The air gap between stator and rotor of 3-phase induction motor ranges from ______

4 cm to 6 cm
2 cm to 4 cm
1 cm to 2 cm
0.4 mm to 4 mm

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Three Phase Induction Motors
The condition of induction motor on load resemble those of a transformer whose secondady is _______

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

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Three Phase Induction Motors
The rotor of an induction motor runs at

Any of the above
Synchronous speed
Above synchronous speed
Below synchronous speed

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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 _____

1200 rpm
600 rpm
1000 rpm
300 rpm

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Three Phase Induction Motors
The no load speed of an induction motor depends on

The maximum flux/poles
The number of its poles
The supply frequency
Both supply frequency and number of poles

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Three Phase Induction Motors
If a 3 phase induction motor is running at a slip S, then approximate efficiency of the motor is ______

None of the listed here
S-1
1+S
1-S

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