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Electrical Machines

Electrical Machines
The constant losses in transformer is/are

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

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Electrical Machines
Ward Leonard control provides speed control

 in one direction only.
 in both direction.
 below rated speed.
 above rated speed.

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Electrical Machines
A 8 pole, 50 Hz single phase induction motor is running at 690 rpm. Its slip with respect to forward field is

 -0.08
 1.92
 -1.92
 0.08

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Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 V
 f
 f²
 V²

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Electrical Machines
The ___________________ generator has the poorest voltage regulation.

  shunt.
  over compounded.
  differential compounded.
  under-compounded.

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Electrical Machines
An inverted V-curve of synchronous motor shows the variation of

 power factor and dc excitation at constant load
 power factor and supply voltage during hunting
 supply voltage and field current at constant excitation
All of these

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