Electrical Machines Questions and Answers – Synchronous Machines
Power Angle Characteristics of Synchronous Machines
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A cylindrical rotor alternator can also run as reluctance motor
Correct!
Wrong!

A synchronous generator is running over excited with a Ef=1.40pu. This machine, with a synchronous reactance of 1.2pu, is delivering a synchronous power of 0.5pu to the bus. If the primemover torque is increased by 1%, by how much will the reactive power, Q change?
Correct!
Wrong!

If the synchronous machine is connected to an infinite bus of constant voltage Vt, through a transformed, a transmission line of reactance ‘X’. then power for a cylindrical machine is
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Wrong!

A synchronous machine which is synchronized with an infinite bus. If it is desired to obtain a condition when the machine delivers the real power to the IBB without changing the field excitation, then
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Wrong!

Maximum power in cylinder rotor alternator occurs at load angle of
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Wrong!

The powerangle characteristic for a three phase salient pole alternator is most correctly shown by
Correct!
Wrong!

In a synchronous machine, hunting is predominantly damped by
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For a 3 phase 400V alternator having 0.5pu of synchronous reactance and its excitation voltage of 1.2pu and Vt of 1pu. Then the power delivered to the infinite bus is
Correct!
Wrong!

For a 3 phase 400V alternator supplying a load of 0.8 pf lagging at an armature current of 1.1pu. The power delivered to load is
Correct!
Wrong!

A 3 phase 400V cylindrical rotor is running at 1500rpm. Suddenly the field excitation zero. Then the net reluctance power is
Correct!
Wrong!

For the effective electromechanical energy conversion in the device, the developed torque depends upon
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The phasor addition of stator and rotor mmfs in a cylindrical rotor synchronous machine, is possible because
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A 3 phase 400V salient pole alternator is running at noload. Suddenly the excitation is removed then the net power in the machine is proportional to
Correct!
Wrong!

A synchronous generator is operating with a Ef=1.40pu. This machine having Xs of 1.2pu, is delivering a synchronous power of 0.5pu to the bus. If the primemover torque is increased by 1%, by how much will the synchronous power P change?
Correct!
Wrong!

Choose the correct power angle characteristics for the synchronous motor and generator
Correct!
Wrong!

Power Angle Characteristics of Synchronous Machines