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Electrical Machines

Electrical Machines
If the full load speed of 3-phase, 50Hz induction motor is 950 rpm, what is its half load speed nearly equals to?

 1000 rpm
 940 rpm
 950 rpm
 975 rpm

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Electrical Machines
The shaft of induction motor should be

  stiff.
  any of these.
  hollow.
  flexible.

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Electrical Machines
Tappings of a transformer are provided

 at the neutral side end of hv side
 at the phase end of hv side
 at the phase end of lv side
 at the middle of hv side

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Electrical Machines
In a DC machine, the angle between the stator and rotor fields is

 dependent upon the load.
 180o.
 90o.
 0o.

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Electrical Machines
Resistance commutation is used generally in case of

 DC machines bellow 5 kW.
  fractional kW DC machines.
 DC machines above 10 kW.
None of these

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Electrical Machines
In induction motor when the length of the air gap is increased, the magnetizing current of the motor increases while the short circuit current __________________.

  remains unchanged.
 decreased.
 increased.
 kept constant to certain value.

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