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Electrical Machines

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

  about 75°.
 about 115°.
 0°.
 90°.

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Electrical Machines
Two transformers operating in parallel will share the load depending on their

 efficiency
 leakage reactance
 ratings
 per unit impedance

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Electrical Machines
In a DC machine, which of these parameters remain the same whether it runs as a DC motor or a DC generator?

 Armature current.
 Induced emf.
 Can not be determined.
 Mechanical power.

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Electrical Machines
A 220 V DC machine has an armature resistance 1Ω. If the full load current is 20 A, the difference of induced voltage and generator is

  40 V.
 0 V.
 20 V.
 60 V.

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Electrical Machines
Under operating conditions the rotor conductor should be _________________ in induction motor.

  semi closed or semi opened.
  none.
  always closed.
  always opened.

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Electrical Machines
What is the actual arrangement of series wound generator?

  Armature and field both are in series with the load.
 Armature and field both are connected.
 Armature winding is in series with load.
 Armature and field both are parallel.

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