Electrical Machines
The overall power factor of an on load transformer

 is always lagging.
 is always unity.
  depends on the power factor of the load.
 is always leading.

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Electrical Machines
With the increase in speed of a DC motor

 back emf increases but line current falls.
 both back emf as well as line current fall.
 back emf falls and line current increases.
 both back emf as well as line current increase.

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Electrical Machines
Slip speed is the

  difference of synchronous speed and actual rotor speed.
  sum of synchronous and rotor speeds.
  half of the sum of synchronous and rotor speeds.
  difference of actual rotor speed and synchronous speed.

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