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Electrical Machines

Electrical Machines
A generator may loose residual magnetism due to

  vibrations.
  heating.
  any of these.
  over excitation.

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

 4000 rpm
 1500 rpm
 1000 rpm
 3000 rpm

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Electrical Machines
A 3-phase slip ring induction motor is wound for 4 poles on stator and 6 poles on the rotor. When 3-phase balanced voltage source at 50 Hz is applied, it will run at

 1500 rpm
 1000 rpm
 750rpm
 zero speed

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Electrical Machines
If the field current is reduced to zero the maximum power developed by alternator is

 0.9103 KW.
 5.46 KW.
 1.644 KW.
  2.73 KW.

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Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 90°
 70° to 85°
 25° to 30°
 0°

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

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

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