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Three Phase Induction Motors

Three Phase Induction Motors
When the rotor of a 3-phase induction motor is blocked, the slip is _____

0
0.1
1
0.5

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Three Phase Induction Motors
The crawling in an induction motor is caused by

Low voltage supply
Harmonics developed in the rotor
High loads
Improper design of machine

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Three Phase Induction Motors
The torque developed in the cage induction motor with auto-starter is

k2/torque with direct switching
K2 × torque with direct switching
K × torque with direct switching
k/torque with direct switching

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Three Phase Induction Motors
The magnetising current drawn by a 3 phase induction motor is about _______ of full load stator current.

10 to 15%
15 to 20 %
5%
30 to 50%

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Three Phase Induction Motors
In the circle diagram for induction motor, the diameter of the circle represents

Running torque
Slip
Rotor current
Line voltage

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Three Phase Induction Motors
If a 4 pole induction motor has a synchronous speed of 1500 rpm, then supply frequency is _____

25 Hz
None of the listed here
50 Hz
60 Hz

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