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Electrical Machines

Electrical Machines
If field current is decreased in shunt dc motor, the speed of the motor

 remains same.
 increases.
 decreases.
None of these

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Electrical Machines
A slip ring Induction motor runs at 290 rpm at full load, when connected to 50 Hz supply. Determine the number of poles and slip.

  P = 20, s = 3.33 %.
  P = 40, s = 5.79 %.
  P = 50, s = 4.43 %.
  P = 60, s = 0.96 %.

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Electrical Machines
Direction of rotation of DC motor is reversed by

 Interchanging armature and field connection.
 Adding resistance to field circuit.
 Reversing armature connection or field connection.
 Reversing supply connection.

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

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

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Electrical Machines
Winding conductors of an electrical power transformer are mainly insulated by

 wooden insulation.
 cotton insulation.
 rubber insulation.
  paper insulation.

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Electrical Machines
If direct axis reactance Xd and quadrature axis reactance Xq are equal, then reluctance power is

 maximum
All of these
 minimum
 zero

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