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Electrical Machines

Electrical Machines
If input of a transformer is square wave the output will be

 triangular wave.
 sine wave.
 square wave.
  pulsed wave.

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Electrical Machines
Methods of synchronizing of alternator may be done by

  all of these.
 all dark lamp method.
 one dark two bright.
 all bright lamp method.

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Electrical Machines
The slip of an induction motor normally does not depend on

  rotor speed.
  core loss component.
  shaft torque.
  synchronous speed.

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Electrical Machines
For a DC Shunt Motor having armature resistance of 0.5 Ω and 2A armature current at no-load, when the armature current is changed to 20A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?

 1037.5 r.p.m.
 963.8 r.p.m.
 1130 r.p.m.
 4575.4 r.p.m.

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Electrical Machines
Synchronising power of a synchronous motor varies

 directly as synchronous reactances Xs
 inversely as 1/Xs
All of these
 directly as Xs2

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Electrical Machines
Which of the following motor is not suitable for frequent starting and stopping?

All of these
 Resistance split phase motor
 Capacitor split phase motor
 Capacitor run motor

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