Electrical Machines
Which motors are preferred for refrigeration and air conditioning in smaller units?

  Induction motors.
  Universal motors.
  Stepper motors.
  Reluctance motors.

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Electrical Machines
In a DC generator, the armature reaction results in

 demagnetization of centers of poles.
  magnetization of inter poles.
  demagnetization of leading & magnetization of trailing pole tip.
 magnetization of leading and demagnetization of trailing pole tip.

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

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