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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
 minimum
 maximum
All of these

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Electrical Machines
At stand still condition the value of slip is

 infinite value
 1
 0
 finite value

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Electrical Machines
Compensating winding are used to rectify the flux density waveform at

None of these
  region under main pole.
 interpole region.
 throughout the air gap.

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Electrical Machines
The inertia constant H of a synchronous condenser is

 greater than that of hydro generator.
 greater than that of turbo alternator.
 equal to that of the effective length of the line.
  none of these.

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Electrical Machines
The armature shaft must be able to with stand

 Twisting stains due to transmission of torque.
All of these
 Any unbalanced magnetic pull on the armature core.
 Bending moment due to weight of the armature.

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Electrical Machines
In a 2 pole lap winding dc machine , the resistance of one conductor is 2Ω and total number of conductors is 100. Find the total resistance

 200Ω
 10Ω
 100Ω
 50Ω

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