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Electrical Machines

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

 zero
All of these
 maximum
 minimum

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Electrical Machines
For the above problem, find the induced voltage of an alternator of it is to deliver a load of 100 A at power factor of 0.8 lagging with terminal voltage of 200 V.

 220 V.
 230 V.
  222 V.
 225 V.

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM is running at a full load speed of 980 rpm. If it delivers an air gap power of 98000 Watt, calculate the rotor ohmic loss?

 1800 Watt.
  980 Watt.
 1920 Watt.
  1960 Watt.

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Electrical Machines
The armature reaction mmf in a DC machines has a form of

  triangular.
 trapezoidal.
 sinusoidal.
 rectangular.

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Electrical Machines
If in a sub – station there is one 132 / 33 kV transformer whose secondary is connected with primary of one 33 / 11 kV transformer, the total transformation ratio of the sub – station will be,

  12.
 4.
 7.
 3.

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Electrical Machines
Slip test is performed to determine

 direct axis reactance and quadrature axis reactance
 positive sequence reactance and negative sequence reactance
All of these
 slip

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