Electrical Machines Questions and Answers – Induction Machines
Circle Diagrams of Induction Machines
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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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Wrong!

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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If the no load test is conducted at its rated frequency but less than the rated voltage, then the wattmeter reading will be
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Blocked rotor test is conducted to find the
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In the following circle diagram of the induction motor, QN is 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 motor speed is
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The rotor mmf per pole in the 3phase, 4pole induction motor varied with slip as
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Circle diagram of an induction motor is graphical representation of
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Stator resistance can be measured using Kelvinâ€™s double bridge.
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In the following circle diagram, CCâ€™ is
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Circle diagram for the variable rotor resistance and fixed reactance is most appropriately shown by
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Circle diagram for the fixed rotor resistance and variable reactance is most appropriately shown by
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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.
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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 depicts the relation between
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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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In the below circle diagram, OG represents
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Use the below circle diagram to choose the correct option
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