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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
Wave winding is employed in DC machine of

 low current and low voltage rating.
 high current and low voltage rating.
 high current and low voltage rating.
  low current and high voltage rating.

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Electrical Machines
Use of fractional pitch winding

  results in reduced leakage reactance.
  results in reduced axial length of the machine.
  make it stiffer.
All of these

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

 increase
 not changed
None of these
 decrease

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Electrical Machines
When the mechanical power is developed by a DC motor maximum

 back emf is equal to applied voltage.
 Back emf is equal.
 None of above.
  Back emf is equal to half of applied voltage.

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Electrical Machines
A 100/10, 50 VA double winding transformer is converted to 100/110 V auto transformer. The rating of auto transformer is

 550 VA
 500 VA
 100 VA
 110 VA

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