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Electrical Machines

Electrical Machines
For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to

 350 V.
 400 V.
 420 V.
 480 V.

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Electrical Machines
Which of following DC generator will be in a position to build up without any residual magnetism in the field?

  Series.
 Shunt.
  Compound.
  Separately excited.

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Electrical Machines
The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be

 230 V
 65 V
 460 V
 115 V

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Electrical Machines
The main purpose of providing tertiary winding in a three phase transformer is

  to suppress harmonic and unbalance in voltage.
None of these
 to interconnect three voltage systems.
 to carry extra load.

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Electrical Machines
A series motor is efficiently suitable for

 none of these.
 constant speed operation.
 low starting torque operation.
  high starting torque operation.

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Electrical Machines
The constant losses in transformer is/are

 eddy current loss.
 copper loss.
 hysteresis loss.
 both 2 and 3.

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