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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
When a DC cummulative compound wound motor is loaded

 Both torque and speed decrease.
  Torque increase and speed decrease.
 Torque decrease and speed increases.
 Torque and speed both increase.

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Electrical Machines
Armature resistance control method is used for the _______ ?

 above rated speed
 below rated speed
None of these
 both 1 and 2

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Electrical Machines
In salient pole synchronous machine, the reluctance power varies as

 sin2δ
 cos2δ
 sinδ
 cosδ

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Electrical Machines
A triangular mmf wave is produced in the air gap of an electric machine. Such wave is produced by

 stator of a dc machine.
 rotor of a dc machine.
 rotor of an synchronous machine.
 stator of a induction machine.

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Electrical Machines
Hunting in a synchronous motor takes place

  when load varies.
  motor is under loaded.
  when supply voltage fluctuates.
  when power factor is unity.

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