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Electrical Machines

Electrical Machines
The no load current in a transformer lags the applied voltage by

 90°.
  about 75°.
 about 115°.
 0°.

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Electrical Machines
The rotor speed of an induction motor is given by

  Nr = 120f / p × (1-s).
None of these
  Ns = 120f /p × ( 1 - r).
  Ns = 120f / p × ( 1 - s ).

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Electrical Machines
A Shunt generator running at 1000 rpm has generated emf of 100 V. If the speed increases to 1200 rpm, the generated emf will be nearly

 140 V
 120 V
 240 V
 175 V

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

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

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

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

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Electrical Machines
For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to

 350 V.
 400 V.
 480 V.
 420 V.

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