Electrical Machines
The direction of rotation of a 3 - Φ induction motor can be reversed by

  transposing all the three leads from the supply.
  transposing any two leads from slip rings.
  transposing any two leads from supply.
  disconnecting any one phase.

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Electrical Machines
With the increase in speed of a DC motor

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

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