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Electrical Machines

Electrical Machines
In DC motors, under trailing pole tips, flux density will_______ ?

None of these
 increase
 either increase or decrease
 decrease

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Electrical Machines
Tertiary winding in a transformer is mostly

 star connected.
 zig - zag delta connected.
  delta connected.
 zig - zag star connected.

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Electrical Machines
Field weakening method is also called as-----------?

 constant current control
 constant voltage control
 constant torque control
 constant power control

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Electrical Machines
At stand still condition the value of slip is

 1
 infinite value
 finite value
 0

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Electrical Machines
Hunting phenomenon is observed in which motor?

 Both A and C.
 Induction motor.
 DC motor.
  Synchronous motor.

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Electrical Machines
During hunting of a synchronous motor

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

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