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Electrical Machines

Electrical Machines
In DC machine torque is proportional to which of the following?

 armature current(Ia)
 flux(φ)
None of these
 both A and B

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Electrical Machines
The armature reaction mmf in a DC machines has a form of

 sinusoidal.
 rectangular.
 trapezoidal.
  triangular.

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Electrical Machines
The self induced emf in the coil undergoing commutation is called the

  statically induced voltage.
  dynamically induced voltage.
  reactance voltage.
None of these

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Electrical Machines
Which of the following represents the rotating losses of machine?

 Eddy current losses
 Hysteresis losses
 Friction and windage losses
 All of the them

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Electrical Machines
In a DC compound motor the field regulator is provided to

 demagnetize the field partially.
 control the field flux.
 limit the armature current.
 control the armature flux.

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Electrical Machines
Which of the following represents the operating region of slip in a 1-phase induction motor?

 0 < S < 2
 0 < S < 1
 -2 < S < 2
 -1 < S < 1

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