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Electrical Machines

Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 28 W.
 25 W.
 36 W.
 30 W.

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Electrical Machines
The armature core of the rotor bars of dc motors are laminated

  to reduce mechanical losses.
  to reduce eddy current loss.
  to provide better flux linkage.
  to reduce hysteresis loss.

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Electrical Machines
Compensating windings is placed in which part of a D.C motor?

 On yoke in the inter pole gap.
  On yoke in the pole faces.
 On armature.
None of these

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

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Electrical Machines
Damper winding is used to

 increase the load current.
 both 1 and 2.
 decrease the load current.
 suppress the hunting.

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Electrical Machines
Field weakening method is also called as-----------?

 constant power control
 constant voltage control
 constant torque control
 constant current control

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