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Electrical Machines

Electrical Machines
Lamination of transformer core is made of

 cast steel.
 wrought iron.
  cast iron.
  silicon steel.

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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

 25 W.
 28 W.
 36 W.
 30 W.

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Electrical Machines
Which of the following pairs is/are correct?

 closed slot----- leakage flux is high
 semi closed slot-----leakage flux is moderate
All of these
 open slot----- leakage flux is less

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Electrical Machines
If the source voltage of a DC motor is increased, which of the following will decrease?

 Starting torque.
 Operating speed.
  Full load current.
 Starting torque, operating speed, full load current.

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Electrical Machines
The rotor winding for a 3-phase slip-ring induction motor having delta-connected stator must be connected in

  delta.
None of these
  delta or star according to need.
  star.

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Electrical Machines
A transformer has resistance and reactance in per unit as 0.01 and 0.04 respectively. Its voltage regulation for 0.8 power factor lagging and leading will be

 6% and -4%
 4.8% and -3.2%
None of these
 3.2% and -1.6%

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