Question 97Electricity/Electronics - 1st Asst/Chief70% to pass
A three-phase alternator is operating at 450 volts with the switchboard ammeter indicating 300 amps. The kW meter currently indicates 163.6 kW, with a power factor of 0.7. If the power factor increases to 0.8, how much would the kW meter reading increase by?
AI Explanation
The correct answer is B) 23.2 KW.
The reasoning is as follows:
1) The initial power output is 163.6 kW at a power factor of 0.7.
2) When the power factor increases to 0.8, the power output will increase proportionally, since power (P) = √3 x V x I x cos(φ), where φ is the power factor angle.
3) Calculating the new power output with a power factor of 0.8 results in an increase of 23.2 kW.
4) The other options are incorrect because they do not accurately reflect the change in power output when the power factor increases from 0.7 to 0.8.
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