4 questions · 8% of the Calculations exam
Why B is correct
Single-phase current equals volt-amperes divided by voltage. Convert 25 kilovolt-amperes to 25,000 volt-amperes, then divide by 240 volts to obtain approximately 104.2 amperes.
Why C is correct
Three-phase current equals volt-amperes divided by 1.732 and line voltage. Dividing 30,000 by 1.732 and then by 208 gives approximately 83.3 amperes.
Why B is correct
Apparent power equals voltage times current: 240 × 156.25 = 37,500 volt-amperes, or 37.5 kVA. Keep units consistent and use only the factors stated; no optional method or unstated demand factor is assumed.
Why C is correct
Apply 125 percent to the 24-ampere compressor and add the 4-ampere fan: 24 × 1.25 + 4 = 34 amperes. Keep units consistent and use only the factors stated; no optional method or unstated demand factor is assumed.
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