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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
All of these
 minimum
 maximum

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Electrical Machines
A DC generator beyond critical resistance will generate

 maximum current.
 maximum voltage.
 maximum power.
 no voltage.

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Electrical Machines
Which of the following induction motor has the highest starting torque?

None of these
 Slip ring induction motor.
 Squirrel cage induction motor.
 Same in both induction motors.

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Electrical Machines
For a DC machine having P no of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance for simple wave-winding ?

 PZL/4S
 PZL/4Sa²
 PZL/ 4Sa
 PZL/4Sp²

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Electrical Machines
Transformer cooling and insulating oil must be of

 low BDV.
 high viscosity.
 low resistivity.
  low viscosity.

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Electrical Machines
In synchronous generator V curve is drawn between

 field current on X-axis and power factor on Y-axis.
 field current on Y-axis and armature current on X-axis.
 either of these.
 field current on X-axis and armature current on Y-axis.

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MORE MCQ ON Electrical Machines

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