Two technicians are discussing using a smoke machine to test an EVAP system. Technician A says that the EVAP system should be leak-tested before setting the machine's controls to Smoke . Technician B says that if the ball in the machine's flowmeter falls to the absolute bottom, it proves that there is a leak. Who is correct?
A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question

Quizplus · Accepted Answer

Technician A is correct because the EVAP system should be leak-tested before setting the machine's controls to Smoke to ensure that the system is sealed and ready for testing. Technician B is incorrect because if the ball in the flowmeter falls to the bottom, it indicates no flow, suggesting no leak, not the presence of a leak.

Two Technicians Are Discussing Using a Smoke Machine to Test