HAC 101 Midterm 27OCT23

1.     The sun's heat travels by:

• conduction
• convection
• absorption
• radiation

1.     Tech A says that heat is removed from the passenger compartment by the heater core. Tech B says that heat in the cab is removed through by the refrigerant and is released to the outside air at the condenser. Who is correct?

• Tech B
• Neither Tech A nor Tech B
• Both Tech A and Tech B
• Tech A

1.     When the air-conditioning compressor clutch is ________, the pulley attached via a belt to the crankshaft can spin freely.

• engaged
• locked
• stuck
• disengaged

1.     The purpose of the evaporator in the A/C system is to do all the following EXCEPT:

Select one:

 

• a.      transform liquid refrigerant to a gas.

• b.     remove the heat from the inside of the cabin.

• c.      cause conduction of heat through the blower motor.

• d.     remove humidity form the air inside of the cabin.

Absolute Zero is the temperature at which all molecular activity theoretically :

• decreases
• increases
• remains constant
• stops

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

• condenser
• compressor
• evaporator
• accumulator

1.     Which of these holds true for H-Valve thermal expansion valve (TXV) operation?

Select one:

 

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.

• c
• d
• b
• a

1.     What switch has three sets of internal contacts?

• trinary switch

• binary switch

• Thermostatic switch

• Ambient temperature switch

1.     The air-conditioning box has a _____ that allows removal of water collected from the moist air as it condenses on the cold evaporator and drips into the box.

• drain tube

• filter
• pipe
• vent

1.     Technician A says road debris, leaves, and animal fur and feathers are the common culprits behind condenser issues that cause high-side pressures to escalate. Technician B says that anything that blocks the front of the condenser can cause this issue. Who is correct?

• Technician B
• Neither technician
• Both technicians
• Technician A