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Electrical Machines

Electrical Machines
Stepper motor is used in

 food processing
 computer printers
 traction
All of these

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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

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

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Electrical Machines
Voltage regulation can be determined by which of the following?

 Synchronous impedance method.
All of these
 MMf method.
 ZPF method.

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Electrical Machines
Autotransformer makes effective saving on copper and copper losses, when its transformation ratio is equal to

  very low
  less than one.
  greater than one.
  approx to one.

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Electrical Machines
The flux involved in the emf equation of a transformer has

 rms value.
 average value.
 total value.
  maximum value.

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Electrical Machines
Which of the following is/are not a self starting motor?

 1-phase induction motor
None of these
 3-phase induction motor
 both 1 and 2

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