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Electrical Machines

Electrical Machines
If direct axis reactance Xd and quadrature axis reactance Xq are equal, then reluctance power is

 minimum
 zero
 maximum
All of these

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Electrical Machines
Hunting phenomenon is observed in which motor?

 Induction motor.
 Both A and C.
 DC motor.
  Synchronous motor.

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Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

  0.573.
 0.649.
 0.443.
 0.512.

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Electrical Machines
The efficiency of a transformer is mainly dependent on

 copper losses.
 dielectric losses.
 core losses.
 stray losses.

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Electrical Machines
A 240 V DC series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 ohms. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 5.7 ohms.
 6 ohms.
 1.9 ohms.
 2.2 ohms.

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Electrical Machines
Two windings provided on the stator of 1-phase induction motor, one main winding and the other auxiliary winding are connected

 either of these depending on the design of the motor
 in series
 through inductive coupling
 in parallel

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