HAC101 Week 2 Quiz Heating & Ventilation

Tech A says that the engine thermostat controls the flow of coolant through the heater system. Tech B says that the heater core can have engine coolant or refrigerant flowing through it, depending on whether heat or cool is commanded. Who is correct?

Select one:

• Tech A

• Tech B

• Both A and B

• Neither A nor B

What is a common coolant mixture ratio of coolant to water in the average vehicle?

Select one:

• 10% coolant to 90% water

• 50% coolant to 50% water

• 80% coolant to 20% water

• 15% coolant to 85% water

Some automotive manufacturers are using activated ______ cabin filters, which help trap odors and airborne pollutants such as carbon monoxide and oxides of nitrogen.

Select one:

• Oxygen

• Nitrogen

• Carbon

• Charcoal

Too strong of an antifreeze mixture in the vehicle's cooling system can cause:

Select one:

• poor cooling.

• overcooling.

• a binding water pump.

• None of the answers listed.

As the engine heats up from the process of burning fuel to create power, the coolant in the engine is also heated, reaching operating temperatures of approximately:

Select one:

• 180 - 220°F

• 150 - 175°F

• 255 - 290°F

• None of the answers listed

Air doors are controlled by any of these methods, EXCEPT:

Select one:

• cables.

• vacuum servos.

• slave cylinders.

• electric servos.

The defrost time of passenger vehicles has decreased considerably because of the air-conditioner being switched on during the defrost cycle.

Select one:

• True

• False

Reversing the refrigerant flow through the air-conditioning system would turn your condenser core into an evaporator and provide ample heat for the passenger compartment.

Select one:

• True

• False

At what mileage increment should in-cabin air filters usually be replaced?

Select one:

• 2,000 - 3,000 miles

• 5,000 - 7,500 miles

• 12,000 - 15,000 miles

• 25,000 - 30,000 miles

Raising the pressure of water 1 psi (7 kPa) raises the boiling point of water approximately _____°F.

Select one:

• 1

• 2

• 3

• 4