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Electrical Machines

Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

 V
 f
 V²
 f²

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Electrical Machines
In synchronous generator V curve is drawn between

 either of these.
 field current on Y-axis and armature current on X-axis.
 field current on X-axis and armature current on Y-axis.
 field current on X-axis and power factor on Y-axis.

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Electrical Machines
Which slots are used in the rotor of an induction motor?

  Open slots.
  Semi closed slots.
  None of above.
  Closed slots.

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Electrical Machines
Wave winding is employed in DC machine of

  low current and high voltage rating.
 high current and low voltage rating.
 low current and low voltage rating.
 high current and low voltage rating.

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Electrical Machines
Number of tappings for each equalizer ring is equal to

  number of commutator segments.
  number of parallel paths.
  number of poles.
  number of pole pairs.

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Electrical Machines
For the speed control of polyphase squirrel cage induction motor, if frequency of operation is decreased with

 constant V, Tst increases
 constant supply voltage V, starting torque Tst decreases
 either of these
None of these

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