Electrical Machines
A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

 36.36% increase
 36.36% decrease
 36.36% increase
 18.18% increase

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Electrical Machines
Two generators operating in parallel with rating 50MW and 100MW respectively. Both their respective governor settings are identical as 4%, consider same no load frequency. How will the machine share a common load of 100 MW

 33.33 MW and 66.67 MW respectively
 66.67 MW and 33.33 MW respectively
 50 MW and 50 MW respectively
 any of the above

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Electrical Machines
With the increase in speed of DC motor

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

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