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Electrical Machines

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

  about 75°.
 about 115°.
 90°.
 0°.

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Electrical Machines
A dc shunt motor has external resistance Ra and Rf in the armature and field circuits respectively. Armature current at starting can be reduced by keeping

 Ra maximum and Rf maximum
 Ra minimum and Rf minimum
 Ra maximum and Rf minimum
 Rf maximum and Ra minimum

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Electrical Machines
For a practical synchronous motor the pull out torque will occur when the torque angle is nearly equal to

 30°.
  75°.
 0°.
 45°.

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Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

 230 V.
 115 V.
 200 V.
 460 V.

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Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

 current.
 power.
 torque.
 speed.

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Electrical Machines
What is the frequency of a alternator, if P = number of poles and N = revolution made per second?

 120N / P Hz.
  PN / 2 Hz.
 120 / PN Hz.
 120P / N Hz.

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