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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. Find the speed of stator magnetic field with respect to rotor?

 30 rpm
 1470 rpm
 1500 rpm
 zero

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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

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

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Electrical Machines
If the excitation is increased, the power factor is

None of these
 unity power factor
 leading power factor
 lagging power factor

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM has a rotor speed of 987 rpm find rotor frequency?

 0.70 Hz.
  0.65 Hz.
 0.75 Hz.
  60 Hz.

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Electrical Machines
If the excitation is critical, the power factor of the alternator is

None of these
 leading power factor.
 unity power factor.
 lagging power factor.

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Electrical Machines
For a transformer to be tested at full load conditions but consuming only losses from the main, we do

 load test
None of these
 OC and SC tests
 back to back test

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