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Electrical Machines

Electrical Machines
If the field current is reduced to zero the maximum power developed by alternator is

 5.46 KW.
 0.9103 KW.
  2.73 KW.
 1.644 KW.

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Electrical Machines
When a short circuit test on a transformer is performed at 25 V, 50 Hz, the drawn current is I1. If the test is performed by 25 V and 25 Hz and power drawn current is I2, then

 I1 = I2
None of these
 I1 > I2
 I1 < I2

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Electrical Machines
In the V curve shown in figure below for a synchronous motor, the parameter of Y and X coordinates are, respectively

  Armature current and field current.
 Power factor and field current.
 Torque and field current.
 Armature current and torque.

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Electrical Machines
In DC generator, lap winding is used in

  high current and low voltage applications.
 high voltage and low current applications.
 where constant speed is required.
 where greater load is connected.

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

All of these
 minimum
 zero
 maximum

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Electrical Machines
The breakdown torque of a synchronous motor varies as

 applied voltage V
 1/V²
 V²
 1/V

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