Which is an acceptable temporary replacement capacitor for a 35 MFD, 440 VAC capacitor?

Which is an acceptable temporary replacement capacitor for a 35 MFD, 440 VAC capacitor?

• A. 30 MFD, 440 VAC
• B. 32 MFD, 440 VAC
• C. 35 MFD, 440 VAC
• D. 37.5 MFD, 440 VAC

Answer: (D)

When replacing a capacitor temporarily in a motor circuit, you want the same voltage rating and a capacitance that’s within the original’s tolerance. If you go lower, starting torque can drop and the motor may have trouble starting; a slightly higher value is usually acceptable as a short-term fix as long as you stay under the same voltage. The original is 35 MFD at 440 VAC. A capacitor of 37.5 MFD at 440 VAC is slightly higher but still within common tolerance, so it helps ensure adequate starting torque without exceeding the voltage rating. Lower values like 30 MFD or 32 MFD reduce torque and can make starting harder, even though they’re within some tolerance. The exact 35 MFD option is acceptable, but choosing a slightly higher value provides a safer temporary cushion for starting and running.

When replacing a capacitor temporarily in a motor circuit, you want the same voltage rating and a capacitance that’s within the original’s tolerance. If you go lower, starting torque can drop and the motor may have trouble starting; a slightly higher value is usually acceptable as a short-term fix as long as you stay under the same voltage.

The original is 35 MFD at 440 VAC. A capacitor of 37.5 MFD at 440 VAC is slightly higher but still within common tolerance, so it helps ensure adequate starting torque without exceeding the voltage rating. Lower values like 30 MFD or 32 MFD reduce torque and can make starting harder, even though they’re within some tolerance. The exact 35 MFD option is acceptable, but choosing a slightly higher value provides a safer temporary cushion for starting and running.