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Electrical Machines

Electrical Machines
The torque speed characteristics of a AC servomotor is approximately

 hyperbola
 any of the above
 parabola
 linearised

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Electrical Machines
Addition of 0.3 % to 4.5 % silicon to iron

  increases the electrical resistivity of iron.
None of these
  reduces the saturation magnetization.
  increases the hysteresis loss.

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Electrical Machines
Use of fractional pitch winding

  results in reduced leakage reactance.
All of these
  results in reduced axial length of the machine.
  make it stiffer.

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Electrical Machines
A large series motor is never started without some mechanical load on it because otherwise it will

 develop excessive speed and damage itself.
 open fuse or circuit breaker.
 produce sparking at brushes.
 draw too much current.

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Electrical Machines
The direction of rotation of a DC motor can be determent by

  Flemings left hand rule.
 Amperes law.
 Lenzs law.
 Flemings right hand rule.

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency?

 96%
 95%
 94%
 92%

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