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Electrical Machines

Electrical Machines
The wound rotor type IM is used for____________ speed operation.

  variable.
  constant.
  minimum.
  maximum.

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Electrical Machines
In dc machines, the space waveform of the air-gap flux distribution affects

 voltage but not the torque
 neither the voltage nor the torque
 torque but not the voltage
 both the torque and voltage

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Electrical Machines
In synchronous generator a synchronous dead load (lamp, furnaces etc) has no ____________ hence it has no natural frequency of oscillation.

  restoring torque.
 synchronizing power co efficient.
 mechanical rotatory system.
 damping torque.

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Electrical Machines
For a 3-phase, 4 pole, 50 Hz synchronous motor the frequency, pole number and the frequency are halved. The motor speed will be

 75 rpm
 375 rpm
 1500 rpm
 3000 rpm

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Electrical Machines
When excitation is increased (over excitation), the synchronous generator operates at

 lagging power factor.
 unity power factor.
 any of the above.
 leading power factor.

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Electrical Machines
Tappings of a transformer are provided

 at the middle of hv side
 at the phase end of lv side
 at the neutral side end of hv side
 at the phase end of hv side

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