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.
  restoring torque.
 damping torque.
 mechanical rotatory system.

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Electrical Machines
If the frequency of input voltage of a transformer is increased keeping the magnitude of voltage unchanged, then

 Ph will decrease but Pe will remain same
 both hysteresis loss(Ph) and eddy current loss(Pe) will increase
 Ph will increase but Pe will decrease
 Pe will increase but Ph will decrease

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Electrical Machines
DC Motor

  dc compound motor.
  dc shunt motor with field weakening.
  dc shunt with armature resistance control.
  dc series motor.

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Electrical Machines
In a DC shunt generator working on load, the brushes are moved forward in the direction of rotation, as a result of this, commutation will

 improve but terminal voltage will fall.
  improve and terminal voltage will rise .
  worsen and terminal voltage will rise.
  worsen and terminal voltage will fall

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