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Three Phase Induction Motors

Three Phase Induction Motors
Which of the following component is usually fabricated out of silicon steel?

Bearings
Shaft
None of these
Stator core

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Three Phase Induction Motors
An induction motor is

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

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

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

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

Parabola
Straight line
Rectangular parabola
Hyperbola

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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

2.5 Hz
0.05 Hz
1.5 Hz
5 Hz

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Three Phase Induction Motors
In a squirrel cage induction motor, the number of rotor bars is generally ________

None of the listed here
Even number
Prime number
Equal to stator poles

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