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Electrical Machines

Electrical Machines
The output power of a dc motor is given by

  EbIa.
  EbIa2.
  none of these.
  EIa.

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Electrical Machines
Which of the following represents the pitch factor?

 Cos α
 Cos (α/2)
 sin (α/2)
 Cos α²

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Electrical Machines
Cross magnetization effects which of the following?

 both 2 and 3
 commutation
 reduction in main field flux
 reduces the terminal voltage

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Electrical Machines
In an alternator the voltage generated per phase is proportional to

  frequency of waveform.
  number of turns in coil.
All of these
  flux per pole.

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Electrical Machines
To get the speed of DC motor is more than normal without wastage of electrical energy _____________ is used.

  Ward Leonard control.
  None of above.
  Rheostatic control.
  Any of above method.

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Electrical Machines
In travelling cranes for hoisting and lowering which type of motor is preferred?

  AC slip ring motor.
  Single phase induction motor.
  DC series motor.
  Synchronous motor.

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