Discussion
The rating of an alternator is expressed in
Answer: C
An alternator is rated in kVA.
The heating of an alternator, which limits its output, depends on the current in its windings and the voltage (which fixes the core loss), not on the power factor of the load. Since the load power factor is decided by the consumer and is not known when the machine is built, the rating is given as the product of voltage and current, in kVA.
A rating in kW or h.p. would depend on the power factor, and kVAR measures only reactive power.
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