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Electrical Machines

Electrical Machines
What is the phase difference between two windings of A.C servomotor ?

 90°.
 60°.
 120°.
 30°.

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Electrical Machines
At what power factor, the voltage regulation of a transformer can be zero ?

 Zero power factor.
  Leading power factor.
 Unity power factor.
 Lagging power factor.

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Electrical Machines
Reversing the direction of rotation of split phase motors is done by

All of these
 reversing the terminals of starting winding.
 interchanging the capacitor from starting winding to main winding or vice versa.
 reversing the terminals of main winding.

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Electrical Machines
If a shunt generator delivers 100 A at 200 V, and the resistances of the shunt field and armature are 100 ohms and 0.01 ohms respectively, the generator emf will be

  parallel.
  no resistance is connected.
  series.
  any one of the connection.

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Electrical Machines
Use of fractional pitch winding

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

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Electrical Machines
In case of DC shunt motor if load is reduced

 DC Shunt Motor
 The speed will increase abruptly.
  The speed will remains almost constant.
 The speed will increase in proportion to reduction in load.

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