HD4 Air Conditioning Basics

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Which of the following is a typical heavy-duty equipment cooling system operating pressure?

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Under increased surface pressure, water, fuel, brake fluid and other liquids, will boil or vaporize at:

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At sea level, a cooling system that operates with a 10 lb. radiator cap will have:

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When liquids change state from a liquid to a gas, they:

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It takes ___________ BTU to raise one pound of water one degree F.

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To change one pound of water into steam at 212 degrees F, it takes __________ BTU''s:

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The amount of energy necessary to change a substance from one state of matter to another without changing its temperature is known as:

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When gases change from a vapor to a liquid they:

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A high pressure operational condition can result in an A/C system from insufficient air flow across the condenser:

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When the CCOT air conditioning system is shut off, the refrigerant will reach a balanced pressure in the complete system:

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The A/C receiver/drier and its dessicant material is designed to absorb:

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When charging an air conditioning system with the vehicle running, the danger of adding liquid refrigerant to the wrong side may damage the:

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What controls the refrigerant flow in an A/C evaporator?

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The Schrader fittings for R-12 and R-134A are interchangeable:

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Refrigerant immediately after leaving the thermostatic expansion valve is a:

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Refrigerant immediately after leaving the thermostatic expansion valve is a:

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Refrigerant after leaving the evaporator should be a:

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An air conditioning system is divided into what is referred to as a high side and a low side, this refers to:

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The most effective way of removing moisture from a contaminated system is by:

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Air conditioning compressors on trucks and equipment are usually ___________ driven.

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The sight glass on an air conditioning system is usually located at or near the:

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An operator finds that water droplets and mist are coming from his floor heating/cooling vents inside the cab when operating his air conditioning system for a period of time. The most likely cause of this would be:

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When checking equipment air conditioning performance while in the shop, it may be necessary to place the engine fan in the manual position, if possible. The reason for this is to cool the:

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When connecting gauges to an A/C system utilizing service valves you would connect the low side gauge to the fitting with the __________hose or piping.

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The A/C accumulator is the alternate piece to the:

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The A/C accumulator is the alternate piece to the:

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Refrigerant after leaving the compressor on a typical air conditioning system is a:

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Refrigerant after leaving the condenser on a typical air conditioning system is a:

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Moisture in an air conditioning system will mix with the refrigerant and create hydrochloric and hydrofloric acids. These acids will eat away at the components of the system destroying them. The most effective way of removing moisture from the system is by:

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The thermostat control for the air conditioning system is located at the:

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The refrigerant in the A/C receiver-drier is a:

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Technician A says that in the condenser, the liquid refrigerant changes to a vapor. Technician B says that in the condenser, the refrigerant vapor changes to a liquid. Who is right?

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When a superheat shutoff switch activates in an A/C system, it shuts off the:

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A high pressure condition can result from insufficient air flow across the condenser. If this happens, the high pressure switch opens and shuts off the:

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Which component in the air conditioning system is most sensitive to foreign materials, such as rust particles or other contaminates?

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A/C service valves on vehicles and heavy equipment are usually located at or near the:

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The oil level of the A/C compressor system should be checked:

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When connecting gauges to a refrigeration system, you would connect the low side gauge between the:

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For the coldest air temperature from the evaporator, the blower fan would need to be at its:

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A small oily spot on an air conditioning fitting may be an indication that there is a refrigeration leak at this point.

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The operation of the A/C thermostatic switch depends on the temperature of the:

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When there is a possibility of exposure to Freon gas during any service operation, you should protect:

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Air conditioning compressors on trucks and equipment are usually controlled by the use of a:

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A high pressure situation on both the low and high sides in an air conditioning system can result from:

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An extremely low suction pressure, accompanied by a normal to low discharge pressure and bubbles in the sight glass, on an air conditioning system would likely indicate:

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When leak testing the refrigeration system, the recommended method would be to test it with:

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With ambient air temperature at 80F (27C), what would be the normal high side pressure with the engine running and the TX type A/C system operating normally?

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If the line between the evaporator and the compressor (before the Schrader valve) became plugged, what would the likely gauge readings be?

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After completing your preinspection of the vehicle, and during a test, you find the compressor belt was slipping on an air conditioning system, what would the likely gauge readings be?

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What would appear in the sight glass if the system were functioning normally:

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HD4 Air Conditioning Basics
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