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Electrical Machines

Electrical Machines
For pure resistive load what is the armature reaction?

 demagnetization
 cross magnetization
All of these
 magnetization

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

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Electrical Machines
Which of the following relation is correct?

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

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Electrical Machines
Armature reaction in DC generators will result in

 short circuit.
 open circuit.
 increase in slip.
 reduction in generated emf.

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Electrical Machines
Which of the following transformer insulating oil generally used in India?

 Aromatics based insulating oil.
  Paraffin based insulating oil.
 Naphtha based insulating oil.
 Olefin based insulating oil.

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Electrical Machines
In a DC series generator, the terminal voltage with increase in load will

 increase to rated voltage and then may decrease
 increase gradually and then stay at rated voltage
 remain nearly constant
 decrease

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