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Three Phase Induction Motors

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

300 rpm
1000 rpm
600 rpm
1200 rpm

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Three Phase Induction Motors
The condition of induction motor at no load resemble those of a transformer whose secondady is _______

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

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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

5 Hz
2.5 Hz
0.05 Hz
1.5 Hz

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Three Phase Induction Motors
The rotor of induction motor

Always revolves in the direction opposite to stator flux
Always revolves in the direction of stator flux
None of the listed here
Insufficient data

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Three Phase Induction Motors
The shape of the torque/slip curve of induction motor is

Straight line
Hyperbola
Rectangular parabola
Parabola

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Three Phase Induction Motors
The torque developed by a 3 phase induction motor least depends on

Rotor emf
Rotor power factor
Rotor current
Shaft diameter

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