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Electrical Machines

Electrical Machines
If we increase the rotor reactance value, the maximum torque will

 not changed
 increase
None of these
 decrease

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Electrical Machines
In single phase rotary converter the number of slip rings will be

 three.
 four.
 two.
 six.

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Electrical Machines
Which of the following load normally needs starting torque more than rated torque?

 Air compressors.
  Conveyers.
 Blowers.
 Centrifugal pumps.

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Electrical Machines
Voltage regulation can be determined by which of the following?

 Synchronous impedance method.
 ZPF method.
 MMf method.
All of these

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Electrical Machines
In a DC Shunt Motor the speed can be increased by

 Increasing the field current.
 Increasing the armature current.
 Decreasing the field current.
 Increasing the field current.

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Electrical Machines
Which of following DC motors will have percentage increase of input current for the same percentage increase in torque?

  Shunt.
 Cummulative compound.
 Differntical compound.
 Series.

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