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Electrical Machines

Electrical Machines
Hysteresis loss is proportional to

 f2.
 f1.5.
 f3.
  f.

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Electrical Machines
Thin laminations are used in a machine in order to reduce

 Eddy current losses
 Both 1 and 2
 Copper losses
 Hysteresis losses

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Electrical Machines
A 3-phase, alternator has generated emf per phase of 230 V with 10% 3rd harmonic and 6% 5th harmonic content. Calculate rms line voltage for star connection.

  230.2 V.
 100 V.
 50 V.
 399 V.

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Electrical Machines
In most condition which frame of motor will be preferred?

 Splash proof.
 Open type.
  Totally enclosed fan coiled.
 Drip proof.

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Electrical Machines
Rotor resistance speed control is used in

 dc shunt motor.
 synchronous motor.
 slip ring induction motor.
 squirrel cage induction motor.

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Electrical Machines
Under which of the following conditions hunting of synchronous motor is likely to occur ?

  Periodic variation of load.
  Small and constant load.
  Over-loading for long period.
  Over-excitation.

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