Question

A system can be evacuated to only atmospheric pressure when: ___________.

a) the repair is major
b) the repair is followed by an evacuation of the appliance to the environment
c) leaks in the appliance make evacuation to the prescribed level unattainable
d) the appliance is being disposed

Answer 1

The system can be evacuated to atmospheric pressure when leaks in the appliance make evacuation to the prescribed level unattainable.

Step-by-step explanation:

The system can be evacuated to only atmospheric pressure when leaks in the appliance make evacuation to the prescribed level unattainable (option c). In this case, the system cannot be completely emptied, resulting in a pressure equal to atmospheric pressure. Any further evacuation attempts will not reduce the pressure below atmospheric level.