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Electrical Machines

Electrical Machines
The speed of rotating magnetic field of 8 pole 50 Hz induction motor is

 750 rpm
 1000 rpm
 3000 rpm
 1500 rpm

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Electrical Machines
A separately-excited DC generator, running at rated speed, has 6 volts across its armature terminals with no field current. When field winding is excited with one ampere, the voltage builds up to 250 V at no load. In case field current is reduced to zero, with the speed remaining unaltered, the armature terminal voltage would be

 less than 6 V
 6 V
 more than 6 V
 zero

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Electrical Machines
In diesel engine, gas engine type of machine contains ___________________ pole type of alternator.

  salient.
 cylindrical.
 none of these.
 non uniform cylindrical.

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Electrical Machines
Stray losses in transformer occurs in

 steel core.
 transformer insulating oil.
  winding conductors and steel structures of transformer.
 paper insulation in transformers.

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Electrical Machines
Which of the following transformer insulating oil generally used in India?

 Aromatics based insulating oil.
 Olefin based insulating oil.
  Paraffin based insulating oil.
 Naphtha based insulating oil.

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Electrical Machines
In which transformer, the tertiary winding is used?

 Star - delta
 Delta - delta
 Delta - star
 Star - star

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