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Electrical Machines

Electrical Machines
Iron losses in a DC machine are independent of variation in

  load.
 speed.
  voltage.
  speed and voltage.

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Electrical Machines
A synchronous motor is supplying a load at unity power factor. If the load on the motor is increased keeping its excitation and terminal voltage constant, the power factor

 will remain the same
None of these
 will become leading
 will become lagging

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Electrical Machines
In synchronous generator a synchronous dead load (lamp, furnaces etc) has no ____________ hence it has no natural frequency of oscillation.

 synchronizing power co efficient.
 damping torque.
 mechanical rotatory system.
  restoring torque.

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Electrical Machines
If starter is not used with large DC motor for starting, it will

 provide execessive voltage drop in line.
 damage the armature and commutator.
 draw a starting current many times its rated full load current.
 all of above.

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. The highest speed of the alternators is

  600 rpm.
  3600 rpm.
  3000 rpm.
  500 rpm.

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Electrical Machines
The back emf produced in a dc motor depends on

  P and Z.
  none of these.
  Z.
  P.

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