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THESE ARE QUESTION FROM THE TOPIC POWER FACTOR IMPROVEMENT FROM THE SUBJECT POWER SYSTEM FUNDAMENTALS PLEASE...

THESE ARE QUESTION FROM THE TOPIC POWER FACTOR IMPROVEMENT FROM THE SUBJECT POWER SYSTEM FUNDAMENTALS PLEASE DO THE QUESTIONS STEP BY STEP AND IN NEAT HAND WRITTING THE ANSWERS ARE GIVEN WITH THE QUESTIONS

1)  A 3-phase synchronous motor having a mechanical load (including losses) of 122 kW is connected in parallel with a load of 510 kW at 0·8 p.f. lagging. The excitation of the motor is adjusted so that the kVA input to the motor becomes 140 kVA. Determine the new power factor of the whole system.

ANS [0·8956 lagging]

2)   A 3-phase synchronous motor is connected in parallel with a load of 700 kW at 0·7 power factor lagging and its excitation is adjusted till it raises the total p.f. to 0.9 lagging. Mechanical load on the motor including losses is 150 kW. Find the power factor of the synchronous motor.

ANS [0·444 leading]

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