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Electrical Machines

Electrical Machines
The output power of any electrical motor is taken from the

 Motor frame.
 Armature.
 Coupling mounted on the shaft.
 Field.

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Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 1 Hz
 2.5Hz
 50Hz
 2HZ

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Electrical Machines
Which of the following machines have highest power factor with respect to magnetizing current?

 Open slot type machines.
 Any of the above.
 Closed slot type machines.
 Semi closed slot type machine.

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Electrical Machines
The armature MMF waveform of a DC machine is

  sinusoidal.
  rectangular.
  pulsating.
  triangular.

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Electrical Machines
Which motor cannot be started on no load?

 both B and C
 series motors
 shunt motors
 cumulative compound motors

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Electrical Machines
Capacitor fitted with ceiling / table fans is of the value of

  1 - 2 µF.
 0.1 µF.
  2 - 3 µF.
 5 - 10 F.

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