Automotive HVAC Systems Test Bank
Course Introduction
This course explores the principles, components, and operation of Heating, Ventilation, and Air Conditioning (HVAC) systems used in modern automobiles. Students will learn about system design, refrigerants, HVAC controls, diagnostic procedures, and repair techniques, emphasizing both manual and automatic climate control units. The course also covers environmental and safety considerations, regulatory standards, and the integration of HVAC systems with other vehicle electronics, preparing students for service and troubleshooting in the automotive industry.
Recommended Textbook
Todays Technician Automotive Heating Air Conditioning Classroom Manual and Shop Manual 5th
Available Study Resources on Quizplus
13 Chapters
631 Verified Questions
631 Flashcards
Source URL: https://quizplus.com/study-set/2214 Page 2
Chapter 1: Heating and Air Conditioning - History and the Environment
Available Study Resources on Quizplus for this Chatper
48 Verified Questions
48 Flashcards
Source URL: https://quizplus.com/quiz/44057
Sample Questions
Q1) What is the air we breathe made up of?
A) 51 percent oxygen and 49 percernt nitrogen
B) 21 percent oxygen and 78 percernt nitrogen
C) 21 percent nitrogen and 78 percernt oxygen
D) 12 percent oxygen and 88 percernt nitrogen
Answer: B
Q2) What is the earth's natural processes by which concentrations of carbon dioxide in the atmosphere are regulated and give an example of how it works.
Answer: The earth has a natural processes by which concentrations of carbon dioxide in the atmosphere are regulated known as the "carbon cycle".Through processes like plant photosynthesis carbon is moved from the atmosphere to the land and oceans of the earth.
Q3) What does the term ozone hole refer to?
Answer: The term ozone hole refers to the loss of the blocking effect of ozone against UV radiation.
Q4) Explain why ozone in the atmosphere is necessary for life on earth.
Answer: Ozone absorbs ultraviolet radiation.Excessive UV radiation would be damaging to life on earth.
Page 3
To view all questions and flashcards with answers, click on the resource link above.
Chapter 2: Temperature and Pressure Fundamentals
Available Study Resources on Quizplus for this Chatper
43 Verified Questions
43 Flashcards
Source URL: https://quizplus.com/quiz/44058
Sample Questions
Q1) Evaporation is being discussed.<i>Technician A</i> says heat is lost when evaporation occurs.<i>Technician B</i> says the rate of evaporation is not affected by air movement.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Answer: A
Q2) Briefly define the term current.
Answer: Current is the flow or rate of flow of electrons under pressure in a conductor between two points having a difference in potential and is measured in ampere's (A)or amperage.
Q3) Explain what happens to molecules at absolute zero (-459.67°F).
Answer: The molecules would have no motion (movement).
Q4) All of the following are gas laws,except:
A) Charles' Law
B) Darwin's Law
C) Dalton's Law
D) Boyle's Law
Answer: B
Page 4
To view all questions and flashcards with answers, click on the resource link above.
Chapter 3: Engine Cooling and Comfort Heating
Systemsdiagnosis and Service of Engine Cooling and Comfort Heating Systems
Available Study Resources on Quizplus for this Chatper
57 Verified Questions
57 Flashcards
Source URL: https://quizplus.com/quiz/44059
Sample Questions
Q1) What are the advantages of engine temperature being adjusted to current operating demands on the electronically controlled cooling system?
Answer: The advantages of adjusting coolant temperature to current operating demands of the engine are lower fuel consumption,reduced emissions and longer engine life.
Q2) What are the requirements when a pressure cap is tested using a cooling system pressure tester?
Answer: The pressure cap cannot leak at a pressure below its rating,and it must open at a pressure above its rating.
Q3) All of the following statements about engine cooling are true,EXCEPT:
A) Engine heat is transferred to the coolant.
B) Coolant heat is transferred to the ambient air.
C) Heat transfer is through conduction and radiation.
D) Much of the heat generated in the engine leaves through the exhaust system.
Answer: C
Q4) What inputs may the PCM look at to determine the need to engage the cooling fan?
Answer: coolant temperature sensor,air conditioning selection switch,air conditioning high-pressure switch,vehicle speed
To view all questions and flashcards with answers, click on the resource link above. Page 5
Chapter 4: Air-Conditioning System Operating
Principlesthe Manifold and Gauge Set
Available Study Resources on Quizplus for this Chatper
50 Verified Questions
50 Flashcards
Source URL: https://quizplus.com/quiz/44060
Sample Questions
Q1) What is the heart of the refrigerant system?
Q2) What affect does the receiver dryer have on the refrigerant?
A) Changes the refrigerant from a liquid to a vapor.
B) Increases the high-side refrigerant pressure.
C) Acts as a storage container for liquid refrigerant.
D) None of the above.
Q3) Explain why low pressure must be maintained in the evaporator.
Q4) What state is the refrigerant in the condenser?
Q5) <i>Technician A </i> says the CFC-12 (R-12)service manifold hose fitting must be 1/2-inch male refrigerant flare nut at each end. <i>Technician A </i>says HFC-134a (R-134a)service manifold hoses use an ACME female nut.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Q6) When relative humidity is high,the air conditioner must work harder than when relative humidity is low.
A)True
B)False
To view all questions and flashcards with answers, click on the resource link above. Page 6
Chapter 5: Refrigerant System Componentsservicing
System Components
Available Study Resources on Quizplus for this Chatper
44 Verified Questions
44 Flashcards
Source URL: https://quizplus.com/quiz/44061
Sample Questions
Q1) Why must the condenser outlet be at the bottom?
Q2) The expansion valve regulates the evaporator temperature based on the thermal heat load it detects.
A)True
B)False
Q3) Removing spring lock fittings on refrigerant lines requires a special tool.
A)True
B)False
Q4) <i>Technician A</i> says the amount of refrigerant flowing through an orifice tube is controlled by a remote sensing bulb.<i>Technician B</i> says the orifice tube is located in the liquid line between the condenser outlet and evaporator inlet.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Q5) If the evaporator is starved,superheat is very high.
A)True
B)False
Q6) What is meant by the term starved evaporator?
To view all questions and flashcards with answers, click on the resource link above. Page 7
Chapter 6: Refrigerant System Servicing and
Testingair-Conditioning System Servicing and Testing
Available Study Resources on Quizplus for this Chatper
51 Verified Questions
51 Flashcards
Source URL: https://quizplus.com/quiz/44062
Sample Questions
Q1) Refrigerant vapors are lighter than air.
A)True
B)False
Q2) <i>Technician A</i> says the manifold and gauge set is an important diagnostic tool.<i>Technician B</i>says the manifold and gauge set is an important tool for evacuating and charging the system.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Q3) An air conditioning system should be pumped down (evacuated)for a minimum of ____ minutes.
A) 10
B) 20
C) 30
D) 60
Q4) Refrigeration oil circulates with the refrigerant through the system.
A)True
B)False
Q5) Define hot and cold refrigerant leaks.
To view all questions and flashcards with answers, click on the resource link above. Page 8
Chapter 7: Diagnosis of the Refrigeration System
Available Study Resources on Quizplus for this Chatper
53 Verified Questions
53 Flashcards
Source URL: https://quizplus.com/quiz/44063
Sample Questions
Q1) <i>Technician A</i> says a restriction at point "A" would cause a high high-side pressure and a low low-side pressure.<i>Technician B</i> says a restriction at "B" would cause low high-side pressure and low low-side pressure.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Q2) What is the symptom of a refrigerant system that is overcharges with refrigerant?
Q3) A refrigerant system with air contamination will still operate properly.
A)True
B)False
Q4) When can R-134a be used in a R-12 system?
Q5) What is the real hazard of excessive concentrations of refrigerants in the service area,whether or not they have contacted an open flame?
Q6) A temperature change at the outlet of a system accumulator indicates the accumulator is restricted.
A)True
B)False
To view all questions and flashcards with answers, click on the resource link above. Page 9
Chapter 8: Compressors and Clutches
Available Study Resources on Quizplus for this Chatper
50 Verified Questions
50 Flashcards
Source URL: https://quizplus.com/quiz/44064
Sample Questions
Q1) What is the compressor clutch?
Q2) The compressor clutch circuit is being tested.<i>Technician A</i> says if the test lamp does not light when connected across the clutch's harness terminals,then the problem is probably a shorted clutch coil.<i>Technician B</i> says a test lamp that flickers or goes out may indicate the PCM or other control device is defective.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Q3) <i>Technician A</i> says some compressor service procedures can be performed on the vehicle if space permits.<i>Technician B</i> says modern compressors can be removed and reinstalled without discharging the rest of the system.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Q4) Explain the difference in operation between the reciprocating compressor crankshaft and the automobile engine crankshaft.
To view all questions and flashcards with answers, click on the resource link above. Page 10
Chapter 9: Case and Duct Systems
Available Study Resources on Quizplus for this Chatper
52 Verified Questions
52 Flashcards
Source URL: https://quizplus.com/quiz/44065
Sample Questions
Q1) When the A/C system is first turned on a foul smell comes out of the duct system.Technician A says that evaporaor icing could be the cause.Technician B says that mold forming in the evaporator case and on the core could be the cause.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Q2) <i>Technician A</i>says the heater control valve is found in-line on the heater hose of most vehicles.<i>Technician B</i>says the evaporator may be found inside the engine compartment on some vehicles.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Q3) If a musty odor develops and becomes very pronounced when the HVAC system is first turned on,the case should be washed out with a garden hose.
A)True
B)False
To view all questions and flashcards with answers, click on the resource link above.
Page 11
Chapter 10: System Controlsdiagnosis and Service of
System Controls
Available Study Resources on Quizplus for this Chatper
49 Verified Questions
49 Flashcards
Source URL: https://quizplus.com/quiz/44066
Sample Questions
Q1) Self-diagnostic systems display trouble areas as a code.
A)True
B)False
Q2) The blower motor in Figure has blower motor speed M2,M3,and High speed.But does not run in either LOW or M1.Which of the faults listed below could be the cause:
A) Faulty blower motor.
B) Faulty blower motor relay.
C) Faulty Heater A/C control assembly.
D) Faulty resistor block.
Q3) Explain what is meant by this sentence: "The change in resistance value of each sensor is inversely proportional to a temperature change."
Q4) Which of the following is the best description of a pressure switch designated nc?
A) It is held closed during normal pressure conditions.
B) It is held closed during extreme low-pressure conditions.
C) It is held closed during extreme high-pressure conditions.
D) It is held open during extreme high-pressure conditions.
Q5) What could happen if the reservoir fails to hold vacuum.
Page 12
Q6) What is the major disadvantage of the telltale light system?
To view all questions and flashcards with answers, click on the resource link above.
Chapter 11: Retrofit and Future Trends
Available Study Resources on Quizplus for this Chatper
45 Verified Questions
45 Flashcards
Source URL: https://quizplus.com/quiz/44067
Sample Questions
Q1) Discuss the use of conversion service fittings for conversions of R-12 to R-134a refrigerant.
Q2) Evacuation of an air conditioning system is being discussed.<i>Technician A</i> says one factor affecting the speed of evacuation is internal restrictions.<i>Technician B</i> says all of the oil is usually removed during evacuation.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Q3) All of the following are removed when the air conditioner is evacuated,EXCEPT: A) refrigerant.
B) oil.
C) moisture.
D) All of the above are removed.
Q4) Why is it important to affix decals to identify a new refrigerant type?
Q5) The air conditioning system is purged of refrigerant if the manifold gauges show a vacuum.
A)True
B)False
To view all questions and flashcards with answers, click on the resource link above. Page 13
Chapter 12: Extenssion 1: Shop Safety
Available Study Resources on Quizplus for this Chatper
54 Verified Questions
54 Flashcards
Source URL: https://quizplus.com/quiz/44068
Sample Questions
Q1) What do the right-to-know laws ensure?
Q2) What should you do if battery acid gets into your eyes?
A) Blink fast to start tears.
B) Rub salve in your eyes.
C) Flush your eyes with water and go to a doctor.
D) All of the above
Q3) What should you do before turning on a battery charger?
A) Check the polarity of the battery
B) Clean the battery cables
C) Connect the leads
D) All of the above
Q4) Explain the safety precautions that should be taken when running an engine in a shop.
Q5) Any hazardous materials that strike the skin should be washed off
A) immediately.
B) within 24 hours.
C) after work.
D) none of the above.
Q6) Name three pieces of information that must be listed on an MSDS.
Q7) What are the characteristics of carbon monoxide gas.
To view all questions and flashcards with answers, click on the resource link above. Page 14
Chapter 13: Extenssion 2: Typical Shop Procedures and Tools
Available Study Resources on Quizplus for this Chatper
35 Verified Questions
35 Flashcards
Source URL: https://quizplus.com/quiz/44069
Sample Questions
Q1) Refrigerant identifiers are being discussed.<i>Technician A </i> says the identifier will only identify CFC-12 (R-12)and HFC-134a (R-134a)by name.<i>Technician B </i>says the identifier will not indicate the presence of flameable gases.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Q2) Service procedures generally provide information in a step-by-step sequence based on manufacturer recommendations.
A)True
B)False
Q3) <i>Technician A </i> says a manifold and gauge sets is a manifold block complete with gauges and charging hoses.<i>Technician B </i> says a can tap is a device used to pierce,dispense,and seal small cans of refrigerant.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
To view all questions and flashcards with answers, click on the resource link above. Page 15