Electrician Red Seal · Question
An electrician is tasked with replacing a capacitor for a single-phase motor. The old capacitor has a rating of 50 µF, 250 VAC. Which of the following replacement capacitors would be acceptable?
When replacing a capacitor, the microfarad (µF) rating should be within ±10% to ensure proper motor performance, and the voltage rating must be equal to or grea
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Question: An electrician is tasked with replacing a capacitor for a single-phase motor. The old capacitor has a rating of 50 µF, 250 VAC. Which of the following replacement capacitors would be acceptable?
Answer options:
- 50 µF, 200 VAC. ✅ 45 µF, 300 VAC.
- 60 µF, 250 VAC.
- 50 µF, 150 VAC.
Correct answer: 45 µF, 300 VAC.
Explanation: When replacing a capacitor, the microfarad (µF) rating should be within ±10% to ensure proper motor performance, and the voltage rating must be equal to or greater than the original. A 45 µF capacitor (10% lower) with a higher voltage rating (300 VAC) is acceptable. A lower voltage rating (200 VAC, 150 VAC) is not permitted, and a 60 µF (20% higher) is generally too far out of tolerance.
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