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Electrical Machines

Electrical Machines
A 3 - Φ, 4 pole, 50 Hz induction motor 4 % slip, calculate frequency of the rotor emf?

 10 Hz.
  2 Hz.
 50 Hz.
  3 Hz.

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Electrical Machines
The stator frame in an induction motor is used to

  protect the whole machine.
  provide return path for the flux.
  ventilate the armature.
  hold armature stamping in position.

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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.

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

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Electrical Machines
In an alternator the voltage generated per phase is proportional to

  number of turns in coil.
  frequency of waveform.
All of these
  flux per pole.

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Electrical Machines
Which of the following DC generators has rising V-I characteristics?

  Compound.
  Series.
  Shunt.
  None of them.

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Electrical Machines
When two DC series motors are connected in parallel, the resultant speed is

 normal speed.
 less than normal speed.
 more than normal speed.
 zero.

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