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Electrical Machines

Electrical Machines
If peak value of phase mmf is F max , then peak value of the rotating field caused by three phase is

 Fmax.
  (3/2)Fmax.
 (1/2)Fmax.
 3Fmax.

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Electrical Machines
In which of the following generators negative voltage regulation can occur?

 series generators
 over compound generator
 both B and C
 shunt generator

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Electrical Machines
If the field circuit of a DC shunt motor is opened

 DC Shunt Motor
  The motor will attain dangerously high speed.
 The armature current will reduce.
 The speed of motor will be reduced.

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Electrical Machines
Which of the following methods are used to control the speed of DC motors is

 field current control
 supply voltage control
 armature circuit resistance control
All of these

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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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Electrical Machines
Armature reaction of an unsaturated DC machine is

 demagnetising.
  magnetising.
  crossmagnetising.
  none of above.

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