New York State Master Electrician Practice Exam

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What is the output in KW of a 5000 KVA transformer feeding a load with a power factor of 80%?

3200 KW
4000 KW
4500 KW
4800 KW

The correct answer is: 4000 KW

To determine the output in kilowatts (KW) of a 5000 KVA transformer when feeding a load with a power factor of 80%, it is essential to use the relationship between KVA, KW, and power factor. The formula to convert KVA to KW is: KW = KVA × Power Factor In this case, the transformer capacity is 5000 KVA, and the power factor is 0.80. Calculating the output in kilowatts: KW = 5000 KVA × 0.80 = 4000 KW This calculation shows that the transformer can effectively deliver 4000 KW of power to the load, given the 80% power factor. The significance of the power factor here is that it accounts for the efficiency of the electrical load in utilizing the apparent power (KVA) delivered by the transformer. Other choices do not align with the correct calculation derived from the KVA and power factor. The output for any other figure would either not reflect the correct application of the power factor or would misrepresent the transformer’s capabilities under the given load conditions.