HVAC Quiz

Technician A says the micron gauge is used in conjunction with the mechanical pressure gauge on your air-conditioning machine. Technician B says the micron gauge is able to measure vacuum very precisely. Who is correct?

• Neither technician
• Both technicians
• Technician B
• Technician A

Technician A says the receiver/drier or accumulator needs to be removed and inspected whenever there are leaks or the desiccant is failing to dry the refrigerant. Technician B says the receiver/drier or accumulator does not require any oil to be added when replacing. Who is correct?

• Both Technicians
• Technician A
• Neither Technician
• Technician B

Which of the following is NOT correct concerning inspecting, testing, and replacing the compressor clutch?

• a. Typically, this component is checked using a DVOM.

• b. The technician needs to determine whether the clutch coil is receiving full power and ground.

• c. If it is, but still will not turn on, the clutch coil should be checked for high resistance.

• d. If the resistance is too high according to the service information, it needs to be replaced; this number is usually 300-500 ohms.

Which of the following is NOT correct concerning a TXV?

• a. If stuck open, the high side pressures would be low and the low-side pressures would be high.

• b. An open-ended wrench should be used when working with nuts and bolts on the TXV and related air conditioner lines.

• c. Typically, the TXV is mounted on the front of the evaporator.

• d. Refer to the service information for the precise process of removing, inspecting and installing a TXV.

Which of the following is correct concerning the evaporator housing water drain?

• a. As the air-conditioning system is running, the evaporator will sweat water throughout the day.

• b. A drain hose is connected to the evaporator housing and exits through the vehicle's firewall.

• c. Both A and B

• d. Neither A nor B