Electrical Machines Questions and Answers – Induction Machines
Equivalent Circuit – Induction Machines
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The actual rotor resistance referred to the stator if the induction motor is
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The electrical anlogous of the mechanical load in the induction machine is given by
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Rc in the below circuit represents
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The leakage reactances are less than their values at the full load operating conditions. Why?
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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
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Stator equivalent circuit for polyphase induction motor is
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Induction generators will deliver power at
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If it is desired to approximate the efficiency of an induction motor operating at slip ‘s’, then its efficiency is given by
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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
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The leakage reactance and the rotor resistance are constant throughout the operation in an induction motor.
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At standstill the equivalent of the 3phase induction motor is similar to
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A 3phase induction machine is running at super synchronous speed. For the machine to be self excited, it
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An induction motor is operating for the load with torque developed proportional to the shaft speed. The characteristics below is
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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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The graph for the induction motor operating with load torque proportional to square of the shaft speed.
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The actual rotor equivalent of an induction motor is best depicted by
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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
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The characteristics required of the induction motor to match that of the load for load torque independent of the shaft speed is
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