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Electrical Machines

Electrical Machines
The material used for commutator brushes is mostly

 cast iron.
  carbon.
 copper.
 mica.

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Electrical Machines
Transformers operating in parallel will share the load depending upon their

 efficiency.
 leakage reactance.
 percentage impedance.
 rating.

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Electrical Machines
In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be

 Less than 50 %
 Around 100 %.
 Any where between 75 % and 90 %.
 Around 90 %

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Electrical Machines
During hunting of a synchronous motor

  field excitation increases.
  harmonic are developed in the armature circuit.
  negative phase sequence currents are generated.
  damper bar develops torque.

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

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

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Electrical Machines
Ward-Leonard control is basically a ___________ control method.

 Armature resistance control.
 Armature voltage control.
 Field control.
 Field diverter control.

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MORE MCQ ON Electrical Machines

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