Automotive Climate Control Systems
Study Guide Questions
Course Introduction
Automotive Climate Control Systems covers the principles, design, and operation of systems that regulate the temperature, humidity, and air quality within vehicles. Students will explore key components such as compressors, condensers, evaporators, refrigerants, sensors, and control units, along with different types of climate control technologies like manual, automatic, and dual-zone systems. The course examines thermal comfort requirements, environmental considerations, system diagnostics, maintenance procedures, and current advances in energy efficiency and eco-friendly refrigerants. Practical sessions may include troubleshooting, servicing, and repairs of real-world automotive climate control systems.
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
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Chapter 1: Heating and Air Conditioning - History and the Environment
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Sample Questions
Q1) Name some effects of ultraviolet radiation.
Answer: Ultraviolet radiation can be damaging to living organisms,causing sunburn; skin cancer; damage to eyes,including cataracts; and premature aging and wrinkling of the skin.UV radiation can also break down the food chain by destroying plankton in the ocean and depriving certain species of their natural food.Plant life and crops can also be harmed or destroyed by excessive radiation.
Q2) 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
Q3) Explain why carbon dioxide in the atmosphere is necessary for life on earth.
Answer: Carbon dioxide absorbs infrared radiation from the sun,preventing it from reradiating out of the earth's atmosphere and,thus,warming the atmosphere.This process is called the greenhouse effect.
Q4) How many ozone molecules can be destroyed by a single molecule of chlorine?
Answer: 100,000
Page 3
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Chapter 2: Temperature and Pressure Fundamentals
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Sample Questions
Q1) <i>Technician A</i> says convection is the process of heat moving to cold.<i>Technician B</i> says convection also involves the movement of heat upwards.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Answer: C
Q2) The acceptable comfort range for the human body is:
A) 45-50 percent relative humidity
B) 72°F-80°F
C) Both A and B
D) Neither A nor B
Answer: C
Q3) 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
Q4) What unit of measurement is resistance in an electrical circuit meased in?
Answer: Ohm's
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Chapter 3: Engine Cooling and Comfort Heating
Systemsdiagnosis and Service of Engine Cooling and Comfort Heating Systems
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57 Flashcards
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Sample Questions
Q1) If a thermostat fails in the open position,all of the following will occur,EXCEPT:
A) A loss of engine coolant.
B) A longer than normal warm-up period.
C) Poor heater performance.
D) A vehicle may fail emissions test.
Answer: A
Q2) <i>Technician A </i> says one should always follow OEM specifications for a radiator pressure cap rating.<i>Technician B </i> says a defective radiator pressure cap could cause overcooling.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Answer: A
Q3) Many electric cooling fans are ultimately controlled by what device?
Answer: power train control module (PCM)
Q4) Name the common engine antifreezes in use today.
Answer: Standard ethylene glycol,extended life ethylene glycol,propylene glycol
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Chapter 4: Air-Conditioning System Operating
Principlesthe Manifold and Gauge Set
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Sample Questions
Q1) The condenser is on the low-pressure side of the system.
A)True
B)False
Q2) All of the following statements about the hand valves in an air conditioning gauge manifold are true,EXCEPT:
A) When both hand valves are closed, both the low- and high-side hose ports are connected only to the low- and high-side gauges.
B) If either hand valve is cracked open and the center hose is opened, refrigerant pressure will equalize across the system.
C) The gauges show respective system pressures when the manifold hand valves are closed.
D) If both manifold hand valves are cracked, the pressures will equalize in the manifold and neither of the gauges will accurately indicate system pressure.
Q3) What is the function of the refrigerant condenser?
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Chapter 5: Refrigerant System Componentsservicing
System Components
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Sample Questions
Q1) If the evaporator is starved,superheat is very high.
A)True
B)False
Q2) If the refrigerant system is suspected of being contaminated with moisture what component should also be replaced?
Q3) O-rings will not usually leak if they are reused.
A)True
B)False
Q4) <i>Technician A</i> says a receiver-drier is used in systems with a fixed orifice tube.<i>Technician B</i> says the receiver-drier stores reserve refrigerant.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Q5) What is a barrier hose and when must one be used?
Q6) What is the function of the evaporator case drain vent?
Q7) Why must the condenser outlet be at the bottom?
Q8) What is the purpose of the evaporator?
Q9) Describe what happens to the refrigerant within the evaporator. Page 7
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Chapter 6: Refrigerant System Servicing and
Testingair-Conditioning System Servicing and Testing
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Sample Questions
Q1) <i>Technician A</i> says any kind of refrigerant can be added to the system for leak testing.<i>Technician B</i> says it is not necessary to purge the hose between the refrigerant container and gauge manifold when adding refrigerant for leak testing.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 a refrigerant is considered contaminated if the refrigerant contains greater than 2 percent of foreign material(s).<i>Technician B</i> says moisture and air reduce the system's efficiency and are considered foreign material or contaminants.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Q3) R-134a is more likely to absorb moisture than R-12.
A)True
B)False
Q4) What is meant by purging an air conditioning system?
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Chapter 7: Diagnosis of the Refrigeration System
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Sample Questions
Q1) Which of the following could cause very low pressures on the low side of a system equipped with an expansion valve?
A) expansion valve stuck open
B) expansion valve stuck closed
C) compressor valves not sealing
D) compressor clutch inoperative
Q2) A refrigerant system with air contamination will still operate properly.
A)True
B)False
Q3) On a cycling-clutch system,the desired average temperature of the evaporator should be about 35°F (1.7°C).
A)True
B)False
Q4) What is the real hazard of excessive concentrations of refrigerants in the service area,whether or not they have contacted an open flame?
Q5) High-side restrictions can cause extremely high temperatures.
A)True
B)False
Q6) How is a baseline used in a refrigerant system diagnosis test?
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Chapter 8: Compressors and Clutches
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Sample Questions
Q1) What are the two basic methods of temperature control for automotive air conditioning systems?
Q2) Explain what happens in a single cylinder of a reciprocating piston compressor during the intake stroke.
Q3) <i>Technician A</i> says most compressor clutches are driven from the engine crankshaft by a belt.<i>Technician B</i> says late model hybrid electric vehicles use an integrated electric motor to drive the compressor.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Q4) To measure and adjust compressor clutch air gap,a ____ feeler gauge should be used.
A) carbon steel
B) soft steel
C) nonmetallic
D) none of the above
Q5) Explain the difference in operation between the reciprocating compressor crankshaft and the automobile engine crankshaft.
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Chapter 9: Case and Duct Systems
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Sample Questions
Q1) In the case and duct system the air distribution mode doors may be operated by all of the following Except:
A) Potentiometers
B) Electrically powered motors
C) Cable
D) Vacuum motors
Q2) Why may the air conditioning compressor be on in the defrost (DEF)position?
Q3) Due to the radiant heat of the sun,the temperature of the interior surfaces can range from 50°-100°F above ambient air temperatures.
A)True
B)False
Q4) The blower can be installed upstream or downstream of the other components. A)True
B)False
Q5) If a vacuum reserve tank holds a vacuum for five minutes,the tank is probably good. A)True
B)False
Q6) From where does recirculated air come?
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Chapter 10: System Controlsdiagnosis and Service of
System Controls
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Sample Questions
Q1) <i>Technician A</i> says the pressure cycling switch directly opens and closes the electrical circuit to the compressor clutch coil.<i>Technician B</i> says the pressure cycling switch sends a signal to the microprocessor to turn the compressor on and off.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 relationship of the aspirator to the in-car temperature sensor?
Q3) <i>Technician A</i> says to always recover the refrigerant before removing a pressure switch.<i>Technician B</i> says a different pressure range switch may be installed to compensate for a worn but serviceable compressor.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Q4) What could happen if the reservoir fails to hold vacuum.
Q5) Why can the high- and low-side temperature switches be used to measure system pressures?
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Chapter 11: Retrofit and Future Trends
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Sample Questions
Q1) The air conditioning system is purged of refrigerant if the manifold gauges show a vacuum.
A)True B)False
Q2) R-744 systems require about half the refrigerant capacity of current R-134a systems.
A)True
B)False
Q3) R-744 is an acceptable substitute for both R-12 and R-134a in a refrigerant system retrofit.
A)True
B)False
Q4) <i>Technician A</i> says mixing two different refrigerants in an air conditioning system is not considered contamination.<i>Technician B</i> says air in an air conditioning system will cause contamination.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
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Chapter 12: Extenssion 1: Shop Safety
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Sample Questions
Q1) What does the word toxicity mean?
Q2) Explain,in the proper sequence,the steps performed to remove a battery from a vehicle.
Q3) Technicians working in the automotive repair industry are rarely exposed to hazards.
A)True
B)False
Q4) Refrigerant R-134a is a flammable refrigerant.
A)True
B)False
Q5) The EPA is a state regulatory agency.
A)True
B)False
Q6) The use of makeshift tools is one of the major causes of hand-tool accidents.
A)True
B)False
Q7) Carbon monoxide may cause vomiting,headaches,and/or dizziness.
A)True
B)False
Page 15
Q8) What are the characteristics of carbon monoxide gas.
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Chapter 13: Extenssion 2: Typical Shop Procedures and Tools
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Sample Questions
Q1) All of the following are basic employee obligations that must be adhered to EXCEPT:
A) Positive attitute
B) Responcibility and pride
C) Dependability
D) Tardiness
Q2) <i>Technician A </i> says a vacuum pump is an essential piece of equipment for servicing a refrigerant system.<i>Technician B </i> says that you only need one manifold gauge set and it may be used for any type of refrigerant you need to service.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Q3) What is a manifold and gauge set?
Q4) What are the four basicemployee obligations?
Q5) A halide leak detector is the best type to use to locate hard to find refrigerant leaks.
A)True
B)False
16
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