Electrician Red Seal · Question
An electrician is troubleshooting a 75 kVA single-phase transformer. If the primary voltage is 2400 V and the secondary voltage is 120/240 V, what is the rated full-load current on the 240 V secondary winding?
The rated full-load current (I) can be calculated using the formula I = kVA * 1000 / V. For the 240 V secondary, I = 75 kVA * 1000 / 240 V = 312.5 A.
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Question: An electrician is troubleshooting a 75 kVA single-phase transformer. If the primary voltage is 2400 V and the secondary voltage is 120/240 V, what is the rated full-load current on the 240 V secondary winding?
Answer options:
- 31.25 A
- 62.5 A
- 156.25 A ✅ 312.5 A
Correct answer: 312.5 A
Explanation: The rated full-load current (I) can be calculated using the formula I = kVA * 1000 / V. For the 240 V secondary, I = 75 kVA * 1000 / 240 V = 312.5 A.
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