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Electrical Machines

Electrical Machines
Direct axis reactance is defined as the ratio of

 Vmax to Imin
 Vmax to Imax
 Vmin to Imax
 Vmin to Imin

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Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 S
 1/(1-S)
 1/S
 1-S

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Electrical Machines
A single-winding single-phase motor has

 low starting torque.
 starting torque equal to full-load torque.
  zero starting torque.
 high starting torque.

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Electrical Machines
In dc motors, under leading pole tips flux density will--------?

 either increase or decrease
 decrease
 increase
None of these

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Electrical Machines
In a DC generator sparking between brushes and commutator surface may be due to

  any of the above.
  under commutation.
 over commutation.
  too rapid reversal of current.

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Electrical Machines
Stray losses in transformer occurs in

 paper insulation in transformers.
  winding conductors and steel structures of transformer.
 steel core.
 transformer insulating oil.

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