New York State Master Electrician Practice Exam

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.