HAC-101 Chap 58 Principles of HVAC Test B

Front

Air conditioning systems absorb heat from a cab interior through a(n)

Back

Evaporator

Front

How do the late-model vehicles help maintain a cleaner and dust-free cab interior? Options: a. Equipped with an air ventilator located at the cab air inlet, b. Equipped with an air filter located at the cab air inlet, c. Equipped with an air compressor located at the cab air inlet, d. Equipped with an air filter located at the cab air outlet

Back

Equipped with an air filter located at the cab air inlet

Front

Moisture condensed on a cold _______ helps remove dirt and other particulates.

Back

Evaporator

Front

Which measurement of heat best describes the quantity of heat required to produce a change of state from a solid to a liquid or a liquid to a gas?

Back

Latent heat

Front

Heating is regulated by circulating engine coolant through an in-cab heat exchanger called a

Back

Heat core

Front

Who is correct regarding the statements about cooling: Technician A says removing heat from an object or substance is simple, because cold always moves toward a warmer object. Technician B says all that is necessary for cooling is to provide an even warmer substance for cold to flow into?

Back

Neither Technician A nor Technician B

Front

Which of the following holds true for refrigeration systems? a. They add moisture to the air passing through the evaporator. b. The compressor is an engine-driven pump that decreases refrigerant pressure. c. Air conditioning and refrigeration systems transfer heat from the cab and passenger compartment to the air stream outside the vehicle. d. The refrigeration system operates in an open loop.

Back

Air conditioning and refrigeration systems transfer heat from the cab and passenger compartment to the air stream outside the vehicle.

Front

The thermal expansion valve device lowers the pressure of the warm, high-pressure liquid refrigerant entering the:

Back

Evaporator

Front

Which of these holds true for H-Valve thermal expansion valve (TXV) operation? a. TVX meters the refrigerant into the evaporator at a variable rate. b. It maintains the evaporator at low temperature and pressure. c. Spring tension acting on the orifice ball regulates the quality of refrigerant flow. d. Inlet temperature also can change the position of the linkage.

Back

TVX meters the refrigerant into the evaporator at a variable rate.

Front

The coldest air temperature from the evaporator is when the blower is operated at its

Back

Slowest