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Electrical Machines

Electrical Machines
Hysteresis loss will depends on

 f1.6
 f³
 f
 f²

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Electrical Machines
A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

 18.18% increase
 36.36% increase
 36.36% decrease
 36.36% increase

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Electrical Machines
A part an alternator winding consist of eight coils in series, each having an emf of 20 V rms induced in it. Coils are placed in successive slots and between each slot and the next, there is an electrical phase displacement of 30°. Find the emf of eight coils in series

 76.91 V.
 56.91 V.
 86.91 V.
  66.91 V.

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Electrical Machines
In travelling cranes for swing action which motor is preferred?

  AC slip ring IM.
  Capacitor type induction motors.
  Reluctance motor.
  DC series motor.

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Electrical Machines
Which of the following is/are the advantages of carbon brush over the copper brush?

All of these
 They are self lubricating in nature
 They are not hard as copper brush
 In case of any sparking they will be less damaged than copper brushes

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Electrical Machines
A motor armature conductor of length 0.5 m is exposed to a flux density of 4 Wb / m2. Calculate the force experienced by the conductor, when the armature current is 5 Amp?

  Can't be determined.
 20 N.
  15 N.
  None of these.

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