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Electrical Machines

Electrical Machines
The wattage rating of a ceiling fan motor will be

  50 - 150 W.
 10 - 20 W.
 200 - 250 W.
 250 - 500 W.

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Electrical Machines
When the armature current of 5 Amp is flowing through the dc motor the torque produced is 47 Nm. Keeping the speed constant if the armature current is increased to 7 amp, calculate the new torque. Assume losses to be constant.

 38.5 Nm.
 74 Nm.
  65.8 Nm.
 27.73 Nm .

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Electrical Machines
If the excitation is increased, the power factor is

 lagging power factor
 unity power factor
 leading power factor
None of these

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Electrical Machines
The armature MMF waveform of a DC machine is

  rectangular.
  triangular.
  pulsating.
  sinusoidal.

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Electrical Machines
The power developed by salient pole synchronous machine is/are

 power due to saliency or reluctance only
None of these
 excitation power only
 both 1 and 2

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Electrical Machines
What is the frequency of a alternator, if P = number of poles and N = revolution made per second?

 120N / P Hz.
  PN / 2 Hz.
 120 / PN Hz.
 120P / N Hz.

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