Nate Electrical Practice Exam

Which capacitor is suitable as a replacement for a 35 mf, 370 volt run capacitor?

1. 35 mf, 330 volt

2. 35 mf, 390 volt

3. 30 mf, 440 volt

4. 40 mf, 370 volt

The correct answer is: 35 mf, 390 volt

A suitable replacement capacitor needs to match or exceed the specifications of the existing capacitor to ensure safety and functionality. In this case, the original capacitor is rated at 35 microfarads (mf) and 370 volts. Looking at the correct choice, selecting a capacitor that is rated at 35 mf and 390 volts meets the capacitance requirement while also exceeding the voltage rating of the original capacitor. This is important because a capacitor's voltage rating indicates the maximum voltage it can safely handle. Using a capacitor with a higher voltage rating can provide a safety buffer and help prevent failure. The other options do not adequately fulfill both the capacitance and voltage requirements. The option with a 330-volt rating does not meet the necessary voltage requirement. The 30-microfarad option falls short on capacitance, which would lead to insufficient performance in the circuit. Finally, the 40 mf capacitor, while having an adequate voltage rating, has a capacitance that exceeds the original specification, which could lead to overcurrent situations in some applications. By selecting the 35 mf, 390-volt capacitor, you ensure that the system will operate safely and effectively within its designed parameters.