HAC-101 Chap 60 Transducers and Thermistors (Auto) Test A

Transducers are electronic devices that convert:

• one form of energy into another

• voltage into amperage

• hot air into cool air

• high pressure to low pressure

______ temperature coefficient thermistors are typically used in automotive HVAC applications.

• Positive

• Cold

• Varying

• Negative

In the automotive climate control system, the ______ measures the temperature of the outside air.

• Cabin air temperature sensor

• Ambient air temperature sensor

• Engine coolant temperature sensor

• Sun load sensor

Tech A states that the fully automatic system control panel typically has an Auto mode that takes care of the entire system. Tech B states that the control panel usually has a digital display to show the temperature selected. Who is correct?

• Tech A

• Tech B

• Both A and B

• Neither A nor B

Tech A states that with dual-zone temperature controls, the air box must have two blend doors and two blend door actuators. Tech B states that the dual-zone temperature control panel contains the same buttons used in other systems but has two temperature control switches. Who is correct?

• Tech A

• Tech B

• Both A and B

• Neither A nor B

_______ HVAC system uses an ECU to determine when to run the compressor and the amount of heat required to match and maintain the desired temperature selected by the operator.

• Automatic

• Semi-automatic

• Mechanical

• Manual

Technician A says that some people refer to the blower motor fan as a squirrel fan. Technician B says that changing the blower fan speed can be done by using a solenoid. Who is correct?

• Tech A

• Tech B

• Both Tech A and B

• Neither Tech A nor B

The air box typically contains two doors to control temperature and function. They are known as the blend door and the _______ door.

• Bland

• Heat

• Air Placement

• Mode

Technician A says that a vacuum servo can be controlled electronically. Technician B says that when vacuum is released from a vacuum servo, the spring will push the diaphragm back to its starting position. Who is correct?

• Technician A

• Technician B

• Both Technician A and Technician B

• Neither Technician A nor Technician B

The door that is responsible for shutting off outside airflow to the cabin when Max A/C is selected is the:

• mix door

• blend door

• air shut-off door

• recirculation door