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Electrical Machines

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

 trapezoidal.
 sinusoidal.
  triangular.
 rectangular.

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Electrical Machines
An inverted V-curve of synchronous motor shows the variation of

 supply voltage and field current at constant excitation
 power factor and supply voltage during hunting
All of these
 power factor and dc excitation at constant load

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Electrical Machines
To have sparkless commutation, the armature reaction effect in a DC machine is neutralized by

 increasing field excitation.
 shifting the brush axis from GNA to MNA.
  compensating winding and commutating poles.
 fixing the brush axis inline with the pole axis.

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Electrical Machines
Mechanical energy is supplied to DC generator at the rate of 4200 J / s. The generator delivers 32.2 Amp at 120 V. What is the percentage efficiency of the generator?

  201.02 V.
 212 V.
 205 V.
 210 V.

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Electrical Machines
Eb/V ratio of a DC motor is an indication of

  Effiency.
 Speed regulation.
 Starting torque.
 Running Torque.

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Electrical Machines
The speed regulation of a DC motor is given as

 (NnL − NfL)/NfL.
 NnL/NfL.
 (NfL − NnL)/NnL.
 NnL − NfL.

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