Electrical Machines
What is the effect of armature reaction ?

 Armature flux distorts the main field flux.
 None of the options.
 Armature flux weakens the main field flux.
  Both option B and C.

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

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Electrical Machines
In an alternator, voltage drops occurs in

  armature resistance only.
  armature resistance, leakage reactance and armature reaction.
  armature resistance and leakage reactance.
  armature resistance, leakage reactance, armature reaction and earth connection.

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Electrical Machines
Skewing of the rotor in a 3 - Φ squirrel cage induction motor reduces

  noise and pullout torque, but increase parasitic and starting torque.
  noise, parasitic and starting torque, but increase pull out torque.
  noise, parasitic torque, starting torque and pull out torque.
  noise and parasitic torque, but increase starting and pull-out torque.

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