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Electrical Machines

Electrical Machines
Which of the following relation is correct?

 Xd < Xq.
None of these
 Xd = Xq.
 Xd > Xq.

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Electrical Machines
A 3 - Φ slip ring motor has

  wound rotor.
  short-circuited rotor.
  any of the above.
  double cage rotor.

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Electrical Machines
Slip test is performed to determine

 slip
 positive sequence reactance and negative sequence reactance
 direct axis reactance and quadrature axis reactance
All of these

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Electrical Machines
A 3 - Φ, 400 / 200 V, Y - Y connected wound rotor induction motor has 0.06 Ω rotor resistance and 0.3 Ω standstill reactance per phase. To make the starting torque equal to maximum torque of the motor the additional resistance required

 0.66 Ω.
 0.78 Ω.
  0.24 Ω.
 0.45 Ω.

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

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

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Electrical Machines
A 4 pole DC shunt generator having a wave winding supplies 50 lamps, each of 60 W at 120 V. The armature and field resistance are 0.2 Ω and 60 Ω respectively. The current in each armature conductor is

 11.5 A.
  13.5 A.
 23 A.
 27 A.

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