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Electrical Machines

Electrical Machines
Regenerative braking is not found in which motor?

 DC shunt.
 DC compound.
  DC series.
 Induction motor.

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Electrical Machines
DC series motor is best suited for electric traction as

  It develops high starting torque.
 It runs at very high speed at light load.
 It consume less power.
 It is cheaper in cost.

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Electrical Machines
When two DC series motors are connected in parallel, the resultant speed is

 zero.
 normal speed.
 more than normal speed.
 less than normal speed.

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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

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

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Electrical Machines
Which of the following motors are suitable for computer printer drive ?

 Shaded pole motor.
 Hysteresis motor.
 Reluctance motor.
  Stepper motor.

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Electrical Machines
Field divertor method of speed control of a DC series motor gives speed above rated one due to reduction of

 Line current.
 None of above.
 Field current.
 Armature current.

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