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Three Phase Induction Motors

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

0.5
1
0.2
Practically zero

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Three Phase Induction Motors
A 3 phase 440 v, 50 Hz induction motor has 4% slip. The frequency of rotor emf will be

50 Hz
200 Hz
2 Hz
20 Hz

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Three Phase Induction Motors
The maximum torque of a 3-phase induction motor under running conditions is

None of the listed here
inversely proportional to rotor reactance at standstill
Directly proportional to rotor resistance
Inveresly proportional to supply voltage

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

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

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Three Phase Induction Motors
An induction motor is

Non self starting
Self starting with zero torque
Self starting with high torque
Self starting with low torque

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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 _____

300 rpm
600 rpm
1000 rpm
1200 rpm

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