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Electrical Machines

Electrical Machines
The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

  60 Hz.
  16.67 Hz.
  25 Hz.
  50 Hz.

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Electrical Machines
The maximum power developed in cylindrical synchronous machine is occurs at a load angle of

 0o.
 Greater than 90o.
 90o.
 less than 90o.

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Electrical Machines
The armature of DC motor is laminated

 to reduce the mass.
 to reduce the inductor.
 to reduce the hysteresis loss.
 to reduce the eddy current loss.

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Electrical Machines
A separately excited DC motor has an armature resistance of 0.5 Ohm. The supply voltage is 250V. Armature current is 20A and the speed of rotation is 1500 rpm. Find the torque developed?

 16.55 Nm
 15.6 Nm
 15.28 Nm
 Zero

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Electrical Machines
In a transformer, the frequency of a voltage at the secondary is

 greater than the primary.
 less than primary.
 any of the above.
 equal to primary.

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Electrical Machines
In a 3-phase induction motor, if the supply voltage and frequency are reduced by the same ratio, then slip at which maximum torque occurs is

 more and maximum torque decreases
 less and maximum torque increases
 less and maximum torque decreases
 more and maximum torque remains constant

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