Automotive Heating and Air Conditioning Final Exam
Course Introduction
This course provides a comprehensive overview of automotive heating and air conditioning systems, covering the principles, components, and operation of climate control technologies used in vehicles. Students will learn about heat transfer, refrigerants, system diagnostics, and service procedures related to heating, ventilation, and air conditioning (HVAC) in both modern and older automobile models. Emphasis is placed on safety practices, troubleshooting common problems, and performing maintenance and repairs using industry-standard tools and techniques. The course prepares students for practical work in automotive HVAC servicing and includes hands-on experience with current equipment.
Recommended Textbook
Todays Technician Automotive Heating Air Conditioning Classroom Manual and Shop Manual 5th
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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
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48 Verified Questions
48 Flashcards
Source URL: https://quizplus.com/quiz/44057
Sample Questions
Q1) The EPA is a federal regulatory agency.
A)True
B)False
Answer: True
Q2) What has NASA determined to be a potential major threat to ozone layer depletion besides CFCs?
Answer: Recent studies by NASA indicate that by 2030 climate change may surpass chlorofluorocarbons as the main cause of ozone depletion.
Q3) Most ozone is formed over the earth's equator.
A)True
B)False
Answer: True
Q4) The odor of a gas is not an indication of its toxicity.
A)True
B)False
Answer: True
Q5) What does the word toxicity mean?
Answer: poisonous quality
Q6) What does SNAP stand for?
Answer: Significant New Alternatives Policy Page 3
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Page 4
Chapter 2: Temperature and Pressure Fundamentals
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43 Verified Questions
43 Flashcards
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Sample Questions
Q1) A change in pressure can affect the ________ of a substance.
A) vaporization
B) toxicity
C) condensation
D) Both A & C
Answer: D
Q2) The word latent means
A) hot.
B) cold.
C) transfer.
D) hidden.
Answer: D
Q3) What is the unit of measurement used to measure latent heat?
Answer: The unit of measurement used to measure latent heat is the British thermal unit (Btu).
Q4) List some air conditioning service equipment that is usually supplied by the shop.
Answer: Refrigerant recovery/recycle system,electronic leak detector,electronic thermometer,charging station,ATC testers,compressor repair tools
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Page 5
Chapter 3: Engine Cooling and Comfort Heating
Systemsdiagnosis and Service of Engine Cooling and Comfort Heating Systems
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57 Verified Questions
57 Flashcards
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Sample Questions
Q1) Engine overcooling is being discussed: <i>Technician A </i> says that a missing thermostat could be the cause of this condition.<i>Technician B </i> says that a thermostat stuck open could be the cause of this condition.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Answer: C
Q2) An engine coolant temperature switch or air conditioner select switch is used to energize the
A) blower motor.
B) radiator fan motor relay.
C) compressor clutch.
D) dashboard warning light.
Answer: B
Q3) Some radiator fan motors will start and run without warning.
A)True
B)False
Answer: True
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Chapter 4: Air-Conditioning System Operating
Principlesthe Manifold and Gauge Set
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50 Verified Questions
50 Flashcards
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Sample Questions
Q1) <i>Technician A </i> says the Schrader-type service valve is automatically opened when the service hose is installed.<i>Technician B </i> says the Schrader-type service valve is automatically closed when the service hose is removed.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 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
Q3) What does the term relative <i>humidity mean</i>?
Q4) The accumulator contains low-pressure vapor.
A)True
B)False
Page 7
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Chapter 5: Refrigerant System Componentsservicing
System Components
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44 Verified Questions
44 Flashcards
Source URL: https://quizplus.com/quiz/44061
Sample Questions
Q1) Once the refrigerant from the air conditioning system has been recovered,which of the following should the technician do?
A) Check the purity of the refrigerant in the recovery tank.
B) Change the recovery unit fiters.
C) Record the amount of refrigerant oil removed from the system.
D) Change the receiver-drier.
Q2) What is a barrier hose and when must one be used?
Q3) What is a flooded evaporator and how does it occur? What are the results of this condition?
Q4) <i>Technician A</i> says in an H-block valve the temperature sensing sleeve (bulb)is internally located in the outlet port of the valve.<i>Technician B</i> says the operation and function of the H-valve,or block valve,are essentially the same as the thermostatic expansion valve (TXV).Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Q5) Define <i>heat load</i>.
Q6) Define <i>desiccant</i>.
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Chapter 6: Refrigerant System Servicing and
Testingair-Conditioning System Servicing and Testing
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51 Verified Questions
51 Flashcards
Source URL: https://quizplus.com/quiz/44062
Sample Questions
Q1) A technician is checking the evaporator for leaks on an R-134a refrigerant system.<i>Technician A</i> says that it is acceptable to use shop air to pressurize the system and use an electrnic microphone to listen for leakage.<i>Technician B</i> says that it is acceptable to charge the system with R-134a and then insert the elctronic leak detector probe in the evaporator drain.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 performance test is a way of measuring system pressures.<i>Technician B</i> says the performance test is a way of measuring the outside humidity.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Q3) Explain the difference between refrigerant recovery,reclaiming,and recycling.
Q4) What is the most efficient device for removing moisture from a refrigerant system?
Page 9
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Chapter 7: Diagnosis of the Refrigeration System
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53 Verified Questions
53 Flashcards
Source URL: https://quizplus.com/quiz/44063
Sample Questions
Q1) A pressure gauge reading of 26 psig (179 kPa)inside the evaporator of a system using R-134a means the evaporating temperature of the refrigerant is about
A) 25°F (-3.9°C).
B) 30°F (-1.1°C).
C) 35°F (1.7°C).
D) 40°F (4.4°C).
Q2) While a technician is performing an A/C system performance test,it is determined that the low pressure gauge is reading in the vacuum range.This reading could be caused by:
A) an overcharged refrigerant system.
B) a flooded evaporator
C) a restricted expansion valve
D) service hoses are connected to the incorrect system ports.
Q3) The outlet of the metering device is usually the coolest part of the system under normal operating conditions.
A)True
B)False
Q4) What can a defective compressor cause systems pressures to be?
Q5) What should you do first before condemning a refrigerant system component?
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Chapter 8: Compressors and Clutches
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50 Verified Questions
50 Flashcards
Source URL: https://quizplus.com/quiz/44064
Sample Questions
Q1) Broken compressor discharge valves are a rare defect.
A)True
B)False
Q2) Replacement compressors are being discussed.<i>Technician A</i> says after installing a replacement compressor the receiver drier/accumulator should also be replced.<i>Technician B</i> says the replacement compressor is supplied with oil,and checking the level is not necessary.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Q3) Why is it very important that the proper amount of oil be added after any service to a compressor?
Q4) If a bearing shows signs of excessive noise,binding,or looseness,it should be regreased.
A)True
B)False
Q5) Explain what happens in a single cylinder of a reciprocating piston compressor during the intake stroke.
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Chapter 9: Case and Duct Systems
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52 Verified Questions
52 Flashcards
Source URL: https://quizplus.com/quiz/44065
Sample Questions
Q1) How does the blend door create the desired in-vehicle temperature?
Q2) It is necessary to drain the engine coolant before replacing A) the blower motor.
B) the heater core.
C) the vacuum diaphragm.
D) all of the above.
Q3) The BILEVEL mode is being discussed.<i>Technician A</i> says air may be directed to the panel and floor in the cooling mode.<i>Technician B</i> says air may be directed to the panel and floor in the heating mode.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Q4) <i>Technician A</i> says a check valve allows flow in one direction only.<i>Technician B</i> says a check valve blocks flow in one direction only.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Page 12
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Chapter 10: System Controlsdiagnosis and Service of
System Controls
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49 Verified Questions
49 Flashcards
Source URL: https://quizplus.com/quiz/44066
Sample Questions
Q1) What causes a thermistor to change resistance value?
Q2) A blower motor is being tested for resistance.<i>Technician A</i> says a higher than specified resistance would cause slower blower operation.<i>Technician B</i> says trash or other items could restrict the blower,causing motor resistance to go up during operation.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Q3) When will a compressor discharge pressure switch disengage the compressor clutch?
Q4) A rattling noise is heard when the engine is running and the air conditioning is off.<i>Technician A</i> says this may be caused by a too narrow gap between the compressor's armature and rotor.<i>Technician B</i> says a quick accurate test is to switch on the air conditioning to see if the noise stops.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Page 13
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Chapter 11: Retrofit and Future Trends
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45 Verified Questions
45 Flashcards
Source URL: https://quizplus.com/quiz/44067
Sample Questions
Q1) <i>Technician A</i> says that the shop that performed the A/C system retrofit must be identified on the retrofit label.<i>Technician B</i>says that the new refrigerant installed must be identified on the retrofit label.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Q2) Vacuum measurement is being discussed.<i>Technician A</i> says the best method is to use an electronic thermistor vacuum gauge.<i>Technician B</i>B says a thermistor may use an analog gauge to display vacuum readings.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Q3) A purity test should be held any time there is a concern about the quality of the refrigerant in the system.
A)True
B)False
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Chapter 12: Extenssion 1: Shop Safety
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54 Verified Questions
54 Flashcards
Source URL: https://quizplus.com/quiz/44068
Sample Questions
Q1) <i>Technician A</i> says shop ventilation is not needed when working on new vehicles because new-vehicle emissions are low.<i>Technician B</i> says the shop's ventilation system should be connected to the exhaust pipe if the engine is running.Who is correct?
A) A only
B) B only
C) Both A and B
D) Neither A or B
Q2) Refrigerant R-134a is a flammable refrigerant.
A)True
B)False
Q3) Describe what is contained in a Material Safety Data Sheet (MSDS).
Q4) When working on electric fan motors,what should you do first?
Q5) The use of makeshift tools is one of the major causes of hand-tool accidents.
A)True
B)False
Q6) Ethylene glycol in even small quantities can be hazardous to small children if ingested.
A)True
B)False
Page 15
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Chapter 13: Extenssion 2: Typical Shop Procedures and Tools
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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 a refrigerant identifier will display R-12 if the refrigerant is 90% CFC-12 by weight.<i>Technician B </i> says a refrigerant identifier will display R-134a if the refrigerant is 98% HFC-134a by weight.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Q2) A vacuum pump is used to remove refrigerant from the system.
A)True
B)False
Q3) What are the four basicemployee obligations?
Q4) <i>Technician A </i> says the high-side gauge on the manifold gauge set is on the left and has a red housing.<i>Technician B </i> says the low-side gauge on the manifold gauge set is on the left and has a green housing.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Page 16
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