Electrical Machines Questions and Answers – Induction Machines
Circle Diagrams of Induction Machines
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In the following circle diagram of the induction motor, QN is the
Correct!
Wrong!

In the below circle diagram, OG represents
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In a 3phase induction motor, the flux per pole will vary with the slip as
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Circle diagram for the fixed rotor resistance and variable reactance is most appropriately shown by
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The rotor mmf per pole in the 3phase, 4pole induction motor varied with slip as
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If the no load test is conducted at its rated voltage but less than the rated frequency.
A. The wattmeter reading will be more than previous.
B. The power factor will also improve.
A. The wattmeter reading will be more than previous.
B. The power factor will also improve.
Correct!
Wrong!

In the following circle diagram, CCâ€™ is
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Blocked rotor test is conducted to find the
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A 10kW, 50 Hz, 3phase induction motor develops the rated torque at 1440rpm. If the load torque is reduced to half, then the power output that can now be obtained is
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If the no load test is conducted at its rated frequency but less than the rated voltage, then the wattmeter reading will be
Correct!
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If the no load test is conducted at its rated frequency but less than the rated voltage, then the mechanical losses will _____ and the constant losses will _______
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No load power factor of the induction motor will __________ if the no load test is conducted at its rated frequency but less than the rated voltage.
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Stator resistance can be measured using Kelvinâ€™s double bridge.
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Circle diagram for the variable rotor resistance and fixed reactance is most appropriately shown by
Correct!
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Use the below circle diagram to choose the correct option
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A 10kW, 50 Hz, 3phase induction motor develops the rated torque at 1440rpm. If the load torque is reduced to half, then the motor speed is
Correct!
Wrong!

Circle diagram depicts the relation between
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Circle diagram of an induction motor is graphical representation of
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Wrong!
