Electrical Machines
The speed of a 3-phase induction motor operating in its stable region

 remains constant.
 decreases with decrease in the load torque.
 increases with increase in the load torque.
 decreases with increase in the load torque.

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Electrical Machines
With the increase in speed of DC motor

 Both back emf as well as line current increase.
 Back emf falls and line current increase.
 Both back emf as well as line current fall.
  Back emf increase but line current falls.

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