Advanced Automotive Diagnostics
Textbook Exam Questions
Course Introduction
Advanced Automotive Diagnostics delves into the theories, principles, and practical applications essential for accurately diagnosing complex automotive systems. Through hands-on experience and advanced diagnostic tools, students learn to identify, analyze, and resolve issues in modern vehicle electronics, engine management, transmission, and emission systems. The course emphasizes systematic troubleshooting techniques, proper use of diagnostic equipment, and interpretation of data from onboard vehicle networks. By exploring real-world case studies, students refine their critical thinking and problem-solving skills, preparing them for industry demands in automotive service and repair.
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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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48 Verified Questions
48 Flashcards
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Sample Questions
Q1) <i>Technician A</i> says CFC-12 (R-12)is no longer being manufactured in the United States.<i>Technician B</i> says CFC-12 (R-12)refrigerant can still be sold.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Answer: C
Q2) What are some of the factors that contribute to the greenhouse effect and climate change?
Answer: The greenhouse effect or global warming,is the result of the release of increasing amounts of so-called 'greenhouse gases' into the atmosphere,gases such as CO ,CH4,and manmade gases such as CFC's and HFC's.These greenhouse gases act as a blanket around the earth retaining heat.
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.
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Page 3
Chapter 2: Temperature and Pressure Fundamentals
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43 Flashcards
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Sample Questions
Q1) Heat is the absence of cold.
A)True
B)False
Answer: False
Q2) Briefly define the term voltage.
Answer: Voltage (V)or electromotive force (EMF)is the electrical pressure and is measured in volts (V); it may be either direct current (DC)or alternating current (AC)
Q3) Identify the components of a molecule of water.Explain why the water molecule differs from its component elements.
Answer: A water molecule consists of two atoms of hydrogen and one atom of oxygen.The combination of two elements,both gas ions in their natural state,produces a liquid that is unlike either.
Q4) Heat is removed from the body by the process of evaporation.
A)True
B)False
Answer: True
Q5) 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) All of the following conditions could cause poor passenger compartment heating system performance EXCEPT:
A) An air pocket in the heater core.
B) Thermostat stuck in the closed position.
C) A heater control valve stuck in the closed position.
D) A restricted heater core.
Answer: B
Q2) List common cooling fan designs used.
Answer: engine-driven fan,declutching fan,flex fans,electric-driven coolant fan motors
Q3) The most common cooling system problems are the result of leaks.
A)True
B)False
Answer: True
Q4) Many electric cooling fans are ultimately controlled by what device?
Answer: power train control module (PCM)
Q5) What is the purpose of the overflow tank?
Answer: The overflow tank helps prevent the loss of coolant and prevents air from entering the system.
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Chapter 4: Air-Conditioning System Operating
Principlesthe Manifold and Gauge Set
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50 Flashcards
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Sample Questions
Q1) 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.
Q2) What component is used and how does liquid refrigerant lower passenger compartment temperature?
Q3) What is the main chemical advantage of R-134a refrigerant over R-12 refrigerant?
Q4) An air conditioning system with an expansion valve will also have a ______.
Page 6
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Chapter 5: Refrigerant System Componentsservicing
System Components
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44 Flashcards
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Sample Questions
Q1) Refrigerant leaves the evaporator as a
A) high-pressure vapor.
B) low-pressure vapor.
C) low-pressure liquid.
D) high-pressure liquid.
Q2) The term purge an air-conditioning system in general terms means to:
A) Add sealant to the refrigerant system
B) Recharge the refrigerant system
C) Flush the refrigerant system.
D) Remove the refrigerant from the system.
Q3) What effect will bent cooling fins on the condenser have on the refrigerant system?
Q4) Before attempting to service an automotive air-conditioning system consider all of the following Except:
A) Can customer afford the repair?
B) Do you have the proper tools and equipment to service the system?
C) Listen to customer complaint.
D) Does your diagnosis make sense based on customer complaint.
Q5) What is the function of the orifice tube?
Q6) Describe what happens to the refrigerant within the evaporator.
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Chapter 6: Refrigerant System Servicing and
Testingair-Conditioning System Servicing and Testing
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Sample Questions
Q1) What are the sources of refrigerant system contamination?
Q2) <i>Technician A</i> says that the recommended oil for most R-134a systems is PAG oil.<i>Technician B</i> says that the recommended oil for R-12 systems is mineral-based oil.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 that the A/C system may be charge through the LOW side when the system is operating.<i>Technician B</i> says that the A/C system may be charged through the HIGH side when the system is off .Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B
Q4) Explain why leaks at the service ports are often missed.
Q5) Refrigerant vapors are lighter than air.
A)True B)False
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Chapter 7: Diagnosis of the Refrigeration System
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53 Verified Questions
53 Flashcards
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Sample Questions
Q1) How does the technician determine whether an excessively low gauge reading is caused by a clogged screen or by moisture in the system?
Q2) <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
Q3) High-side restrictions can cause extremely high temperatures. A)True
B)False
Q4) Moisture in a refrigerant system may cause intermittent poor system performance. A)True
B)False
Q5) What is the symptom of a refrigerant system that is overcharges with refrigerant?
Q6) What can a defective compressor cause systems pressures to be?
Q7) What are most restrictions in a refrigerant system are caused by?
Page 9
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Chapter 8: Compressors and Clutches
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Sample Questions
Q1) 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
Q2) There are signs of oil spray on the compressor clutch hub and nearby underhood areas.<i>Technician A</i> says that a faulty compressor clutch bearing could be the cause.<i>Technician B</i> says that a leaking compressor shaft seal 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
Q3) Explain what happens in a single cylinder of a reciprocating piston compressor during the intake stroke.
Q4) Why is it important that the compressor seals not be touched with the fingers?
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Chapter 9: Case and Duct Systems
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52 Verified Questions
52 Flashcards
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Sample Questions
Q1) During normal air conditioning system operation,system mode doors are
A) fully opened.
B) fully closed.
C) partially closed.
D) all of the above, depending on the mode selected.
Q2) Even in the MAX A/C mode,some systems provide for up to 50 percent fresh air.
A)True
B)False
Q3) An odor emitting from the case and duct system may be caused by all of the following,Except:
A) Refrigerant gas leak.
B) Mold and mildew.
C) Refrigerant oil leak.
D) A leaking heater core.
Q4) 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
Q5) From where does recirculated air come?
Q6) How does the blend door create the desired in-vehicle temperature?
Page 11
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Chapter 10: System Controlsdiagnosis and Service of
System Controls
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49 Verified Questions
49 Flashcards
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Sample Questions
Q1) The vacuum system is used to ____ the heater coolant valve and mode doors to achieve a desired preselected temperature and humidity level.
A) open
B) close
C) position
D) all of the above
Q2) What causes a thermistor to change resistance value?
Q3) What is a blower motor power module?
Q4) The temperature fluctuates between hot and cold on a vehicle equipped with an automatic temperature control system.Which of the following is the most likely cause?
A) A open blower motor control relay.
B) A low refrigerant charge level.
C) A faulty coolant temperature sensor.
D) A disconnected in-car temperature sensor aspirator tube.
Q5) How does the automatic temperature control regulate temperature?
Q6) When will a compressor discharge pressure switch disengage the compressor clutch?
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Q7) Name the components in the simplest type of heater/air conditioner control system.
Chapter 11: Retrofit and Future Trends
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45 Flashcards
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Sample Questions
Q1) R-12 with greater than 2 percent of R-134a is considered contaminated.
A)True
B)False
Q2) A refrigerant retro fit label must contain all of the following,Except:
A) The refrigerant charge amount installed.
B) The amount of R-12 removed from the system.
C) The type of refrigerant oil installed and the part number.
D) Name and address of the installer who performed the retrofit.
Q3) 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
Q4) What questions should the technician ask the customer if there is a possibility that the refrigerant is contaminated?
Q5) Discuss the use of conversion service fittings for conversions of R-12 to R-134a refrigerant.
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Chapter 12: Extenssion 1: Shop Safety
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54 Flashcards
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Sample Questions
Q1) There are basically two types of antifreeze,those based on propylene glycol and those based on ethylene glycol.
A)True
B)False
Q2) What do the right-to-know laws ensure?
Q3) The use of makeshift tools is one of the major causes of hand-tool accidents.
A)True
B)False
Q4) What action must be taken immediately when a chemical gets in the eyes.
Q5) Ingestion of as little as 2 ounces of ethylene glycol can kill a dog.
A)True B)False
Q6) What type of injury is caused by improper lifting techniques.
Q7) Explain the safety precautions that should be taken when running an engine in a shop.
Q8) Explain,in the proper sequence,the steps performed to remove a battery from a vehicle.
Q10) What are the characteristics of carbon monoxide gas. Page 14
Q9) Describe some of the procedures that should be followed when working with gasoline.
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Page 15
Chapter 13: Extenssion 2: Typical Shop Procedures and Tools
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35 Verified Questions
35 Flashcards
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Sample Questions
Q1) What must a shop have for tools in addition to technician's tools for refrigerant service?
Q2) What does the acronym VIN stands for?
Q3) 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
Q4) 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
Q5) OSHA was established to improve workers wages.
A)True
B)False
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