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Electrical Machines

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

 cosδ
 cos2δ
 sin2δ
 sinδ

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Electrical Machines
During hunting of a synchronous motor

  field excitation increases.
  damper bar develops torque.
  negative phase sequence currents are generated.
  harmonic are developed in the armature circuit.

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Electrical Machines
Tap changer is generally provided in

 earthing transformer.
 voltage transformer.
  power transformer.
 current transformer.

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

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

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor will

 none of these.
 Decrease.d
 remains same.
 increase.

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Electrical Machines
Which of the following is/are the methods to reduce the armature reaction and its effects?

 pole stacking
All of these
 pole chamfering
 compensating winding

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MORE MCQ ON Electrical Machines

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