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Electrical Machines

Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 f²
 V
 f
 V²

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Electrical Machines
The fall in speed of the DC generator due to increase in load can be corrected by

  increasing the input to the prime mover.
 cooling the armature.
  reducing the load voltage.
  increasing the excitation.

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Electrical Machines
The current drawn by the armature of DC motor is directly proportional to

 The voltage across the terminals.
 None of above.
 The torque required.
 The speed of motor.

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Electrical Machines
Counter emf of a DC motor

 exceeds supply voltage
 aids applied voltage.
 helps in energy conversion.
 regulates its armature voltage.

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

 Produce sparking at brushes.
 Draw too much current.
 Open fuse or circuit breaker.
  Develop excessive speed and damage itself.

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Electrical Machines
Transformers operating in parallel will share the load depending upon their

 percentage impedance.
 leakage reactance.
 rating.
 efficiency.

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MORE MCQ ON Electrical Machines

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