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ELECTRICAL MACHINES

Electrical Machines
In a synchronous motor torque or load angle δ ------------- with increase in load

 remains unaffected
 decreases
None of these
 increases

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Electrical Machines
Synchronising power of a synchronous motor varies

All of these
 inversely as 1/Xs
 directly as synchronous reactances Xs
 directly as Xs2

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Electrical Machines
For a 3-phase, 4 pole, 50 Hz synchronous motor the frequency, pole number and the frequency are halved. The motor speed will be

 3000 rpm
 75 rpm
 1500 rpm
 375 rpm

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Electrical Machines
Maximum power developed by a synchronous motor depends on

 supply voltage and load angle
 supply voltage and excitation
 supply voltage, load angle and excitation
 excitation and load angle

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Electrical Machines
Stability of a synchronous motor ---------- with the increase in excitation.

 increases
 remains unaffected
 any of the above
 decreases

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