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Electrical Machines

Electrical Machines
The output power of a dc motor is given by

  EIa.
  EbIa2.
  none of these.
  EbIa.

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Electrical Machines
Which of the following DC Motor uses 4-point starter?

 DC series motor.
 DC compound motor.
 DC shunt motor with field weaking control.
 DC shunt motor with armature resistance.

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Electrical Machines
Which of the following motors has negative speed regulation?

 Differential compound motors.
 Shunt motors.
 Series motors.
 Both B and C.

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Electrical Machines
If Kh is hysteresis constant, f is supply frequency, Bm maximum flux density in core of transformer, the expression of hysteresis loss in transformer, is given by

  KhfBm1.6.
 KhfBm3.
 KhfBm.
 Khf2Bm1.6.

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Electrical Machines
What is the emf generated by a 4 pole Lap connected DC Motor rotating at 1500 rpm having 1000 conductors and useful flux per pole is 0.4 mWb.

 20 volts.
 10 volts.
 30 volts.
 40 volts.

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Electrical Machines
A DC generator beyond critical resistance will generate

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

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