Electrical Machines Questions and Answers – Induction Machines
Equivalent Circuit – Induction Machines
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The leakage reactances are less than their values at the full load operating conditions. Why?
Correct!
Wrong!

The characteristics required of the three phase induction motor to match that of the load with the criteria of load torque inversely proportional to the shaft speed is
Correct!
Wrong!

An induction motor is operating for the load with torque developed proportional to the shaft speed. The characteristics below is
Correct!
Wrong!

At standstill the equivalent of the 3phase induction motor is similar to
Correct!
Wrong!

The actual rotor equivalent of an induction motor is best depicted by
Correct!
Wrong!

The actual rotor resistance referred to the stator if the induction motor is
Correct!
Wrong!

If it is desired to approximate the efficiency of an induction motor operating at slip â€˜sâ€™, then its efficiency is given by
Correct!
Wrong!

Stator equivalent circuit for polyphase induction motor is
Correct!
Wrong!

A 3phase induction machine is running at super synchronous speed. For the machine to be self excited, it
Correct!
Wrong!

The leakage reactance and the rotor resistance are constant throughout the operation in an induction motor.
Correct!
Wrong!

The characteristics required of the induction motor to match that of the load for load torque independent of the shaft speed is
Correct!
Wrong!

In a 3phase induction generator which is self excited, load has been increased.To keep the frequency of the generated voltage constant, speed of the induction machine should be
Correct!
Wrong!

Induction generators will deliver power at
Correct!
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The electrical anlogous of the mechanical load in the induction machine is given by
Correct!
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Rc in the below circuit represents
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A delta connected capacitance bank is preferred over a star connected bank. This is done to ensure
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Wrong!

The graph for the induction motor operating with load torque proportional to square of the shaft speed.
Correct!
Wrong!

A star connected capacitor bank is connected to the induction motor having capacitance C and VA rating as VAs.If the capacitor bank is replaced by a delta bank then
Correct!
Wrong!
