Engine: General Subjects

1. A The machine has a suspected leak; therefore, nitrogen should be added to bring the pressure to 70 psig prior to checking for leaks.
2. B The machine has a suspected leak; therefore, the refrigerant pressure should be raised to 35 psig by adding refrigerant prior to checking for leaks.
3. C The machine may or may not have a leak; therefore, the machine should be checked for leaks without any adjustments in pressure.
4. D The machine definitely does not have a leak; therefore, no attempt at leak detection is necessary.

Tip: press A-D to answer