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Electrical Machines

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

 maximum
 zero
All of these
 minimum

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Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 230 V
 200 V
 115 V
 460 V

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Electrical Machines
In IM the rotor lamination can be ________________ than stator laminations.

  thinner.
  rotor can not have any laminations.
  thicker.
  sipper.

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Electrical Machines
A 4 pole DC generator rotates at 1500 rpm. How many times in a second, will the emf induced in each armature conductor changes its direction?

  100.
 500.
 750.
 200.

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Electrical Machines
Ward Leonard control provides speed control

 in both direction.
 above rated speed.
 below rated speed.
 in one direction only.

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Electrical Machines
A series motor is efficiently suitable for

 low starting torque operation.
 none of these.
 constant speed operation.
  high starting torque operation.

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MORE MCQ ON Electrical Machines

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