The maximum power developed in a synchronous motor occurs at a coupling angle of
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Electrical Engineering · all questionsSynchronous Motors
Synchronous Motors
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When the stator windings are connected in such a fashion that the number of poles are made half, the speed of the rotor of a synchronous motor
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The speed of a synchronous motor
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In which of the following motors the stator and rotor magnetic field rotate at the same speed ?
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In a synchronous motor, the breakdown torque is
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The angle between the rotating stator flux and rotor poles is called _____ angle.
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A 3-phase synchronous motor is running clockwise. If the direction of its field current is reversed
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Due to which of the following reasons a synchronous motor fails to pull into synchronism after applying D.C. field current?
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When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop
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The working of a synchronous motor is similar to
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Power factor of a synchronous motor is unity when
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In a 3-phase, 4-pole, 50 Hz synchronous motor, the frequency, pole number and load torque all are halved. The motor speed will be
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Which of the following motors is non-self starting ?
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Which of the following losses, in a synchronous motor, does not vary with load?
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Stability of a synchronous machine
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Which of the following methods is used to start a synchronous motor ?
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Which of the following resistances can be measured by conducting insulation resistance test on a synchronous motor ?
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Which of the following losses is not dissipated by the stator core surface in a synchronous motor ?
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The mechanical displacement of the rotor with respect to the stator, in polyphase multipolar synchronous motors running at full load, is of the order of
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A synchronous motor working at leading power factor can be used as
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