Refrigeration & Air Conditioning Mechanic Red Seal · Question
When testing a run capacitor for a single-phase motor, a technician uses a multimeter with a capacitance setting. The capacitor is rated at 40 µF ± 5%. Which of the following readings would indicate a faulty capacitor?
A 40 µF capacitor with ± 5% tolerance should measure between (40 - 0.05*40) = 38 µF and (40 + 0.05*40) = 42 µF. Therefore, 37 µF falls outside this acceptable r
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Question: When testing a run capacitor for a single-phase motor, a technician uses a multimeter with a capacitance setting. The capacitor is rated at 40 µF ± 5%. Which of the following readings would indicate a faulty capacitor?
Answer options:
- 39 µF
- 42 µF ✅ 37 µF
- 44 µF
Correct answer: 37 µF
Explanation: A 40 µF capacitor with ± 5% tolerance should measure between (40 - 0.0540) = 38 µF and (40 + 0.0540) = 42 µF. Therefore, 37 µF falls outside this acceptable range, indicating a faulty capacitor.
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