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Electrical Machines

Electrical Machines
A 4-pole DC generator runs at 1500 rpm. The frequency of current in the armature winding is:

 100 Hz.
 Zero Hz.
 25 Hz.
 50 Hz.

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Electrical Machines
Which of the following statement is true for an AC synchronous motor?

  It is a constant speed motor.
 It is a variable speed motor.
 It is a high reluctance motor.
 It is a step angled motor.

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Electrical Machines
The demagnetising component of armature reaction in a DC generator

  results in sparking trouble.
  reduces inter poles flux density.
  increases armature speed.
  reduces generator emf.

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Electrical Machines
A smaller air gap in a polyphase induction motor helps to

  reduce the chance of crawling.
  reduce the chance of cogging.
  increase the starting torque.
  reduce the magnetizing current.

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms connected directly to a 220 Volt supply. If the armature is stationary then the current flowing through the armature is

 340 A.
 440 A.
 570 A.
 250 A.

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Electrical Machines
In a DC machine, which of these parameters remain the same whether it runs as a DC motor or a DC generator?

 Induced emf.
 Mechanical power.
 Armature current.
 Can not be determined.

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