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Electrical Machines

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

All of these
 maximum
 minimum
 zero

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Electrical Machines
A 2 KVA transformer has iron loss of 150 W and full load copper loss of 250 W. The maximum efficiency of the transformer would occur when the total loss is

 250 W
 500 W
 400W
 300 W

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Electrical Machines
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

 2 .1 Ω
 1.79 Ω
 1.8 9 Ω
 3.1 Ω

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Electrical Machines
How can the synchronous speed of a 3 - Φ IM be varied?

  By varying the supply frequency.
  By varying number of poles.
  Both (A) and (B).
  By varying supply voltage.

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Electrical Machines
A crusher is equipped with

 Synchronous motor.
 Reluctance motor.
 DC shunt motor.
 Slip ring induction motor.

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Electrical Machines
In a 3 - Φ IM in order to eliminate cogging the number of stator slots must be

  unequal to number of rotor slots and skewed in shape.
  either (B) or (C).
  an integral multiple of number of rotor slots.
  equal to number of rotor slots.

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