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Electrical Machines

Electrical Machines
A 3-phase 6 pole 50 Hz induction motor is running at 5% slip.What is the speed of the motor?

 1000 rpm
 950 rpm
 850 rpm
 900 rpm

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

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

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Electrical Machines
In a DC generator the emf generated by the armature is maximum when

 rate of change of flux is minimum.
 induced voltage is high.
  rate of change of flux is maximum.
 shaft rotation is high.

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Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

 either GNA or MNA
 GNA
None of these
 MNA

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Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 V²
 f
 V
 f²

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Electrical Machines
For a 3 - Φ, 4 pole, 50 Hz IM rotating at full load speed of 1440 rpm, calculate speed of rotor field with respect to rotor structure and stator structure respectively?

  60, 1500.
 60, 1440.
 1440, 1500.
 50, 1500.

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