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Electrical Machines

Electrical Machines
Voltage regulation of transformer is given by

 (V2 - E2) / E2
 (E2 - V2) / E2
 (V2 - E2) / V2
 (E2 - V2) / V2

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Electrical Machines
A synchronous motor will deliver maximum power when

  load angle is 0°.
  input power factor is unity.
  load angle is 45°.
  load angle is equal to internal angle θ.

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Electrical Machines
What type of connection is made in between the inter-pole and the field winding?

 Compound.
 None of the options.
 Parallel.
  Series.

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Electrical Machines
What is the highest possible speed of turbo alternators?

 1000 rpm
 4000 rpm
 3000 rpm
 1500 rpm

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Electrical Machines
If dimension of all the parts of a synchorous generator and the number of field and armature turns are double, then generated voltage will change by a factor of

 2.
 4.
  8.
 1.

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

 1000 rpm
 1500 rpm
 3000 rpm
 750 rpm

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