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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
When R2 is rotor resistance, X2 the rotor reactance at supply frequency and s the slip, then the condition for maximum torque under running condition will be

  R2 = sX2.
  R2 = s2X2.
  R2 = s2X2.
  sR2 = X2.

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Electrical Machines
Universal motors are used in

 cranes
All of these
 traction
 food processing

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Electrical Machines
If the field current is reduced to zero the maximum power developed by alternator is

 5.46 KW.
 1.644 KW.
 0.9103 KW.
  2.73 KW.

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Electrical Machines
A 500 V, 55 kVA single phase alternator has an effective resistance of 0.5 Ω. An excitation current of 10 A produces 200 A armature current on short circuit and an emf of 450 V on per circuit. The synchronous reactance will be

 2.74 Ω.
 2.781 Ω.
  2.241 Ω.
 25.564 Ω.

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency?

 96%
 95%
 94%
 92%

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