Principles of Heating and Air Conditioning

What type of compressor uses two interwoven scrolls?

• Variable displacement compressor

• Sanden Scroll Compressor

• Rotary Vane compressor

• Sanden Wobble Plate Compressor

Choose the correct statement with respect to driers.

•     Driers are circulated in the system.

• They absorb any moisture in the system.

•    They are left open to absorb the moisture.

• They are placed in the restriction

All of the following statements with respect to hoses, pipes, and tubes are true except

• Heater hose can substitute for air-conditioning hose if needed.

•     Pipes are used particularly where no give or movement is necessary.

• Hoses are slid into the pipes and a crimp is used to fasten them.

• All air-conditioning hoses must be a barrier-type hose.

Choose the correct statement with respect to pressure switches.

•    They are used to display the pressure drop and rise in the system.

• They are in parallel connection with the AC compressor

•      They send inputs to the control module to vary the com­pressor speed.

• They are used to engage and disengage the compressor clutch.

The fixed orifice tube is used for?

• sensing changes in temperature.

• blocking the flow of liquid refrigerant through the system.

• adjusting heat in the cabin.

• allowing only a specific amount of liquid refrigerant through at a time.

Which of the following components in the AC transforms low pressure fluid to low pressure gas?

• Compressor

•    Condenser

• Restriction

• Evaporator

Which of the following components provides the needed refrigerant movement in the system?

• Compressor

• Condenser

• Restriction

• evaporator

All of the following are properties of a refrigerant except:

• It has a super low boiling point.

• It changes its state without breaking down.

• It vaporizes and condenses at the correct temperature and pressure.

• Its pressure remains unchanged during the cooling cycle.

How does air-conditioning absorb a large amount of heat energy?

• By evaporating a liquid

• By freezing a liquid

• By cooling a liquid

• By cooling a gas

Automotive air conditioning service and repair technicians need to have which special license?

• 409

• 609

• None

• Hazmat