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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

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

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Three Phase Induction Motors
If a 3 phase induction motor is running at a slip S, then approximate efficiency of the motor is ______

1-S
1+S
None of the listed here
S-1

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Three Phase Induction Motors
The speed of a squirrel cage induction motor is changed by

Cascade control
Rheostatic control
Pole changing
None of the listed here

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Three Phase Induction Motors
The starting torque of an induction motor is maximum when rotor resistance per phase is _____ rotor reactance / phase.

Two times
None of the listed here
Equal to
Four times

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Three Phase Induction Motors
In an induction motor, no load the slip is generally

2%
4%
1.5 %
Less than 1%

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Three Phase Induction Motors
The advantage of wound rotor motor is that _______

It requires less maintenance
None of the listed here
External resistance can be inserted in the rotor circuit
It is inexpensive

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