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Three Phase Induction Motors

Three Phase Induction Motors
The complete circle diagram of induction motor can be drawn with the help of data found from

Stator resistance test
Blocked rotor test
No-load test
All of these

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Three Phase Induction Motors
The injected e.m.f. in the rotor of induction motor must have

Zero frequency
The same frequency as the slip frequency
The same phase as the rotor e.m.f.
High value for the satisfactory speed control

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Three Phase Induction Motors
The maximum torque in an induction motor depends on

Frequency
Square of supply voltage
All of the listed here
Rotor inductive reactance

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Three Phase Induction Motors
The reactance of the rotor circuit of a 3-phase induction motor is maximum at

Starting
No load
Half full load
Full load

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Three Phase Induction Motors
If an induction motor is running at slip S, then rotor output is ______

(1-S) × rotor input
S × rotor input
(S-1) × rotor input
(1+S) × rotor input

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Three Phase Induction Motors
For the same kVA rating, the leakage flux in induction motor is _______ that of transformer.

Less than
About the same
None of the listed here
More than

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