Deck 62: Heating and Air-Conditioning Components and Operation

Question 1

Technician A says that heat is measured in degrees. Technician B says that temperature is measured in degrees. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Answer 1

Technician B only

Question 2

When the defrost setting is selected the air conditioning compressor operates.

Answer 2

True

Question 3

Where in the air conditioning system is the refrigerant a low pressure gas?

A)Condenser inlet
B)Evaporator inlet
C)Evaporator outlet
D)Condenser outlet

Answer 3

Evaporator outlet

Question 4

Where in the air conditioning system is the refrigerant a high pressure liquid?

A)Evaporator inlet
B)Evaporator outlet
C)Condenser inlet
D)Condenser outlet

Question 5

The compressor operates continuously in which type of system?

A)POA/EPR
B)Orifice tube

Question 6

Technician A says that all HFC-134a uses the same refrigerant oil. Technician B says that refrigerant oil, regardless of type, must be kept in a sealed container to keep it from absorbing moisture from the air. Which technician is correct?

A)Technician B only
B)Neither technician A nor B
C)Both technicians A and B
D)Technician A only

Question 7

A front-wheel drive vehicle has a broken condenser line. What other vehicle component may also be defective that could have caused the condenser line to break?

A)Cooling fan
B)Engine mounts
C)Shock absorbers
D)AC compressor drive belt

Question 8

Clear water is observed dripping out from beneath the vehicle. Technician A says that is normal. Technician B says that the evaporator housing is defective and should be replaced. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 9

The material used to absorb moisture inside an AC system is called ________.

A)Desiccant
B)PAG
C)Drier
D)Ester

Question 10

Which position on the climate control panel should the driver select to avoid having the air-conditioning compressor turn on?

A)Defrost
B)Heat
C)AC
D)Both A and B

Question 11

What is the function of the desiccant bag inside an accumulator?

A)It captures excess R 134a.
B)It captures and stores moisture.
C)It stores and releases ice.
D)All of the above.

Question 12

The ozone layer is in which of earth's atmospheric layers?

A)Mesosphere
B)Thermosphere
C)Stratosphere
D)None of these is correct

Question 13

Which of the following is NOT a function of the expansion valve?

A)Provide the restriction that separates the low side from the high side
B)Prevent the evaporator from freezing
C)Allow liquid refrigerant to return to the compressor
D)Meter refrigerant into the evaporator for maximum cooling

Question 14

Which type of refrigerant hose is used with an R-134a system?

A)Rigid hose
B)Flexible, porous hose
C)Copper type hose
D)Barrier hose

Question 15

Which of the following can result from evaporator freeze-up?

A)Air is not drawn over the fins
B)The air-conditioning system produces little or no cooling.
C)The refrigerant may not properly evaporate.
D)All of the above.

Question 16

A fixed-orifice tube ________.

A)Has a pressure sensing capability
B)Is usually located in the evaporator inlet or line to the evaporator
C)Has a temperature sensing capability
D)Has an internal valve

Question 17

In which component is heat added to the refrigerant?

A)Condenser
B)Thermostatic expansion valve
C)Evaporator
D)None of these is correct

Question 18

Most rigid refrigerant lines are made of ________.

A)Steel
B)Titanium
C)Copper
D)Aluminum

Question 19

What is the purpose of the expansion device located at the evaporator inlet?

A)Meters the correct amount of refrigerant flow into the evaporator
B)Provide a restriction to create pressure in the refrigerant high side
C)Both A and B
D)Neither A nor B

Question 20

Compressing a vapor ________.

A)increases the pressure and increases the temperature
B)decreases the pressure and increases the temperature
C)increases the pressure and decreases the temperature
D)decreases the pressure and decreases the temperature

Question 21

The three states of matter are ________.

A)solid, liquid, and fluid
B)solid, liquid, and vapor
C)solid, vapor, and gas
D)liquid, vapor, and fluid

Question 22

When heating a substance, latent heat is ________.

A)the amount of heat given off without changing state
B)the heat added to cause a change of state while the temperature stays the same
C)the heat added that causes a change in temperature
D)the number of calories needed to raise the temperature 1 degree Celsius

Question 23

Which of the following is used in modern automobiles to transfer heat energy?

A)Refrigerant
B)Engine coolant
C)Both A and B are correct
D)Neither A nor B are correct

Question 24

A main source of heat used to warm the passenger compartment is ________.

A)Sunlight
B)Ambient air
C)Humidity
D)The vehicle engine

Question 25

The orifice tube divides the high side of the system from the low side.

Question 26

Technician A says that any technician that handles automotive refrigerant must be certified in knowledge of regulations by an EPA approved agency. Technician B says that recycling equipment must be properly approved. Who is correct?

A)Neither technician A nor B
B)Technician B only
C)Technician A only
D)Both technicians A and B

Question 27

What are the state(s) of the refrigerant in the accumulator-drier?

A)Vapor
B)Liquid
C)Both A and B
D)Neither A nor B

Question 28

Which of the following is NOT a subsystem in a modern automotive HVAC system?

A)Cooling system
B)Refrigeration system
C)AC controls
D)All of these are HVAC subsystems

Question 29

On a TXV system, the thermal sensing bulb is located at the ________.

A)Evaporator outlet
B)Condenser inlet
C)Evaporator inlet
D)Condenser outlet