HAC-101 Final Review

The door that is responsible for shutting off outside airflow to the cabin when maximum air-conditioning is selected is the:

• Mix door.

• Blend door.

• Air shut-off door.

• Recirculation door.

Air doors are controlled by all of the following methods EXCEPT:

• Cables.

• Vacuum servos.

• Slave cylinders.

• Electric servos.

With the use of , maintaining vaporization and condensing points at normal ambient temperatures is simply done by raising or reducing the pressure of the refrigerant.

• Radiation

• Convection

• Conduction

• Refrigerants

Before charging the air-conditioning system, be sure to have a minimum of _____ (2.3 kg) plus your charge amount in the air-conditioning machine.

• 1 lb

• 3 lbs

• 5 lbs

• 7 lbs

The ECU sends output commands to which type of component to control fan speed, heater core coolant flow, and air-conditioning clutch activation?

• Transistor

• Actuator

• Integrated circuit

• Capacitor

In a system equipped with a rear climate control panel, with the rear air control panel selected on the front panel, the rear passengers can typically select ______.

• Temperature

• Fan speed

• Mode

• All of the above

The purpose of the air conditioner compressor is to:

• Change a low-pressure liquid refrigerant to a high-pressure liquid refrigerant.

• Change a low-pressure gas refrigerant to a high-pressure liquid refrigerant.

• Change a low-pressure liquid refrigerant to a high-pressure gas refrigerant.

• Change a low-pressure gas refrigerant to a high-pressure gas refrigerant.

______ sniffers are supersensitive microphones that can pick up the hiss of a leak that is too small to be heard by human ears.

• Ultrasonic

• Thermal

• Optical

• Magnetic

Most automatic temperature control doors are typically operated by which of the following methods?

• Hydraulic units

• Vacuum actuator

• Electric actuator

• Mechanical cable

Technician A says that conduction is when heat transfers through solids. Technician B says that radiation is when heat travels through space. Who is correct?

• Technician A

• Technician B

• Both Technician A and Technician B

• Neither Technician A nor Technician B