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Electrical Machines

Electrical Machines
Which of the following represents the pitch factor?

 Cos α
 sin (α/2)
 Cos α²
 Cos (α/2)

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Electrical Machines
Which of the following voltage regulation method is accurate ?

 Synchronous impedance method
 American standard association method
 MMf method
 ZPF method

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Electrical Machines
In DC generator, armature reaction refers to what?

 Effect of armature flux on the load.
  Effect of armature flux on the main field flux.
 Effect of field flux on the armature flux.
None of these

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Electrical Machines
For a 3-phase, 4 pole, 50 Hz synchronous motor the frequency, pole number and the frequency are halved. The motor speed will be

 1500 rpm
 75 rpm
 3000 rpm
 375 rpm

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Electrical Machines
Variation in speed by ward-Leonard control of DC motors occurs due to variation in

  Armature current.
  Field excitaion.
  Armature voltage.
  Supply voltage.

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Electrical Machines
Which machine is used for battery charging?

 DC series generator.
 None of these.
 Compounded DC generator.
 DC shunt generator.

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MORE MCQ ON Electrical Machines

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