Unit 68 quiz

A manual-type HVAC system requires the operator to fully control all of the following EXCEPT:

• Direction.

• Velocity.

• Temperature.

• Exterior temperature.

Which of the following sub-systems does an automatic climate system NOT control?

• Cleaning

• Heating

• Ventilation

• Air conditioning

Technician A says that to check the cooling fan operation, you may be able to use bidirectional controls on the scan tool. Technician B says a scan tool is the only tool required for testing the cooling fan. Who is correct?

• Technician A

• Technician B

• Both Technician A and Technician B

• Neither Technician A nor Technician B

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

Most hybrid vehicles use a _____ to drive the air-conditioning compressor.

• Heavy-duty belt

• High-voltage electric motor
• Low-voltage electric motor

• Light-duty belt

The position of the servo motor can be reported back to the ECU by use of a:

• Solenoid.

• Servo.

• Potentiometer.

• Relay.

Electric actuators have small plastic gears inside that can strip out if the mode doors get jammed or develop excessive _____ when turning.

• Drag
• Ground

• Load

• Short

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

• Cables.

• Vacuum servos.

• Electric servos.

• Slave cylinders.

One of the first steps in checking the operation of an automatic or semiautomatic HVAC system is to research the system’s operation in the _____, which will give you a good idea of how to perform a thorough testing.

• Service information
• Technical service bulleting

• Shop policy manual

• Owner’s manual

Technician A says that the benefit of a dual drive air-conditioning compressor is that it can be belt driven or driven by the high-voltage battery. Technician B says that the purpose of the dual drive is to provide two speeds of air-conditioning compressor operation. Who is correct?

• Technician A

• Technician B

• Both Technician A and Technician B

• Neither Technician A nor Technician B