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Electrical Machines

Electrical Machines
In DC machine torque is proportional to which of the following?

None of these
 armature current(Ia)
 both A and B
 flux(φ)

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Electrical Machines
If the excitation is reduced, the power factor is

 lagging power factor
 leading power factor
None of these
 unity power factor

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Electrical Machines
In a synchronous motor electromagnetic power varies

 inversely as applied voltage
 directly as square of applied voltage
 directly as applied voltage
None of these

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Electrical Machines
For P pole machine relation between electrical degrees and mechanical degrees is

 θelec = θmech
 θelec = 4/P*θmech
 θelec = P/2*θmech
 θelec = 2/P*θmech

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Electrical Machines
The no load current in a transformer lags the applied voltage by

 about 115°.
  about 75°.
 0°.
 90°.

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Electrical Machines
When the excitation of normally operating unloaded, salient pole synchronous motor suddenly gets disconnected, it continues to run as a

 induction motor.
 DC motor.
 switched reluctance motor.
 variable reluctance motor.

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