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Electrical Machines

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

 sinusoidal.
 rectangular.
  triangular.
 trapezoidal.

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Electrical Machines
The sparking at the the brushes, in a DC machines is due to

 high resistance of carbon brushes.
 presence of commutator.
  reactance voltage.
 armature reaction.

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Electrical Machines
In the V curve shown in figure below for a synchronous motor, the parameter of Y and X coordinates are, respectively

 Torque and field current.
  Armature current and field current.
 Armature current and torque.
 Power factor and field current.

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Electrical Machines
Which of the following DC Motor is used in paper machines?

 DC compound motor.
 DC Shunt motor.
 Separately excited DC motor.
 DC series motor.

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Electrical Machines
In which of the following, voltage regulation may be zero or negative

 unity power factor
All of these
 leading power factor
 lagging power factor

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Electrical Machines
Generators work on the principle of production of

 statically induced emf.
None of these
 dynamically and statically induced emf.
 dynamically induced emf.

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