Quiz 2 - Lubricating And Cooling Systems
Review questions on lubricating systems
Questions and Answers
- 1.
Which of the following is a function of the engine's lubrication system?
- A.
Holds an adequate supply of oil
- B.
Removes contaminates from the oil
- C.
Delivers oil to all necessary areas of the engine
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
The engine's lubrication system performs multiple functions. It holds an adequate supply of oil to ensure proper lubrication of the engine's moving parts. It also removes contaminants from the oil, preventing them from causing damage to the engine. Additionally, the lubrication system delivers oil to all necessary areas of the engine, ensuring that all components receive proper lubrication. Therefore, all of the options mentioned in the question are correct functions of the engine's lubrication system.Rate this question:
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- 2.
Technician A says that the 'S' service rating system (SA,SB,SC,etc.) rates oil for gasoline engines and refers to the level of additives and other characteristics of the oil's makeup. Technician B says that an SL rated oil can be used in place of an SH rated oil. Who is correct?
- A.
A only
- B.
B only
- C.
Both A and B
- D.
Neither A nor B
Correct Answer
C. Both A and BExplanation
Both Technician A and Technician B are correct. The 'S' service rating system does indeed rate oil for gasoline engines and refers to the level of additives and other characteristics of the oil's makeup. Additionally, an SL rated oil can be used in place of an SH rated oil, as SL is a more recent and improved rating.Rate this question:
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- 3.
Engine oil viscosity ratings are being discussed. Technician A says a low-weight oil works best in high-temperature regions. Technician B says all multi-viscosity oils are interchangeable. Who is correct?
- A.
A only
- B.
B only
- C.
Both A and B
- D.
Neither A nor B
Correct Answer
D. Neither A nor BExplanation
Neither Technician A nor Technician B is correct. Engine oil viscosity ratings are determined by the Society of Automotive Engineers (SAE) and are represented by a numerical code. The first number in the code indicates the oil's viscosity at low temperatures, and the second number represents its viscosity at high temperatures. Therefore, a low-weight oil may not necessarily work best in high-temperature regions, as other factors such as the engine's design and operating conditions also play a role. Additionally, not all multi-viscosity oils are interchangeable, as different engines may require specific viscosity grades for optimal performance and protection.Rate this question:
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- 4.
Technician A says that engine oil is used to clean, cool, and lubricate the engine. Technician B says engine oil helps seal some internal engine parts. Who is correct?
- A.
A only
- B.
B only
- C.
Both A and B
- D.
Neither A nor B
Correct Answer
C. Both A and BExplanation
Both Technician A and Technician B are correct. Engine oil is indeed used to clean, cool, and lubricate the engine. It helps to remove dirt and debris from the engine components, absorbs heat generated by the engine, and reduces friction between moving parts. Additionally, engine oil also helps to seal some internal engine parts, such as the piston rings, preventing oil leakage and maintaining proper compression.Rate this question:
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- 5.
Engine oil pressure is being discussed. Technician A says low pressure may be caused by worn engine bearings. Technician B says oil viscosity, temperature, and contamination can affect oil pressure. Who is correct?
- A.
A only
- B.
B only
- C.
Both A and B
- D.
Neither A nor B
Correct Answer
C. Both A and BExplanation
Both technicians A and B are correct. Technician A is correct in stating that low engine oil pressure can be caused by worn engine bearings. Worn engine bearings can lead to excessive clearance, which can result in a decrease in oil pressure. Technician B is also correct in mentioning that oil viscosity, temperature, and contamination can affect oil pressure. The viscosity of the oil can impact its ability to flow and maintain pressure, while temperature changes can also affect the oil's viscosity. Additionally, contamination, such as dirt or debris, can restrict the flow of oil and result in lower pressure.Rate this question:
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- 6.
When an engine experiences decreased oil pressure, Technician A says that piston slap is a likely initial symptom. Technician B says that valvetrain noise is common with decreased oil pressure. Who is correct?
- A.
A onl;y
- B.
B only
- C.
Both A and B
- D.
Neither A nor B
Correct Answer
B. B onlyExplanation
Technician B is correct. When an engine experiences decreased oil pressure, valvetrain noise is a common symptom. This is because the valves and lifters rely on proper lubrication from the oil to function smoothly. Decreased oil pressure can cause the valves and lifters to become noisy and potentially lead to further engine damage if not addressed. Piston slap, on the other hand, is a separate issue that is not directly related to decreased oil pressure.Rate this question:
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- 7.
Which of the following would not cause low oil pressure?
- A.
Plugged oil pickup screen
- B.
Excessive oil dilution
- C.
Excessive engine valve lifter wear
- D.
Excessive engine bearing wear
Correct Answer
C. Excessive engine valve lifter wearExplanation
Excessive engine valve lifter wear would not cause low oil pressure because the valve lifters are not directly related to oil pressure. The valve lifters are responsible for opening and closing the engine valves, while oil pressure is primarily affected by factors such as the oil pump, oil viscosity, and any blockages in the oil passages. Therefore, excessive engine valve lifter wear would not directly impact oil pressure.Rate this question:
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- 8.
Which of the following would be a likely cause excessive oil consumption?
- A.
Faulty PCV system
- B.
Worn piston rings
- C.
Neither A nor B
- D.
Both A and B
Correct Answer
D. Both A and BExplanation
Both a faulty PCV system and worn piston rings can contribute to excessive oil consumption. The PCV (Positive Crankcase Ventilation) system is responsible for removing blow-by gases from the engine's crankcase. If the PCV system is faulty, it may not be able to properly regulate the pressure and flow of these gases, leading to increased oil consumption. Worn piston rings, on the other hand, can allow oil to leak into the combustion chamber, where it is burned and consumed. Therefore, both A (faulty PCV system) and B (worn piston rings) can be likely causes of excessive oil consumption.Rate this question:
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- 9.
Technician A says high oil pressure wil cause valve cover gasket leaks. Technician B says low oil pressure can be caused by a faulty PCV system. Who is correct?
- A.
A only
- B.
B only
- C.
Both A and B
- D.
Neither A nor B
Correct Answer
D. Neither A nor BExplanation
Neither Technician A nor Technician B is correct. High oil pressure does not cause valve cover gasket leaks. Valve cover gasket leaks are typically caused by worn or damaged gaskets. Similarly, low oil pressure is not caused by a faulty PCV (Positive Crankcase Ventilation) system. Low oil pressure can be caused by a variety of issues such as a malfunctioning oil pump or a leak in the oil system.Rate this question:
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- 10.
Technician A says that extended life coolant is more environmentaly friendly. Technician B says two year coolant (green) can be used to top off all automotive cooling systems. Who is correct?
- A.
A only
- B.
B only
- C.
Both A and B
- D.
Neither A nor B
Correct Answer
D. Neither A nor BExplanation
Technician A is not correct because extended life coolant may not necessarily be more environmentally friendly. Technician B is also not correct because two year coolant (green) cannot be used to top off all automotive cooling systems, as different vehicles may require different types of coolant. Therefore, neither Technician A nor Technician B is correct.Rate this question:
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- 11.
In most automotive applications, the water pump is driven by the:
- A.
Flywheel
- B.
Camshaft
- C.
Crankshaft
- D.
Impeller
Correct Answer
C. CrankshaftExplanation
The water pump in most automotive applications is driven by the crankshaft. The crankshaft is a vital component of the engine that converts the reciprocating motion of the pistons into rotational motion. It is directly connected to the water pump through a pulley and belt system. As the crankshaft rotates, it transfers its power to the water pump, which circulates coolant throughout the engine to prevent overheating.Rate this question:
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- 12.
Why are modern cooling systems pressurized?
- A.
To raise coolant's boiling point
- B.
To prevent leaks
- C.
To move the coolant through the system
- D.
To prevent corrosion in the system
Correct Answer
A. To raise coolant's boiling pointExplanation
Modern cooling systems are pressurized to raise the coolant's boiling point. By increasing the pressure, the boiling point of the coolant also increases, allowing it to absorb more heat from the engine without evaporating. This helps prevent the coolant from boiling and potentially causing engine damage or overheating.Rate this question:
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- 13.
What is the most likely symptom of a vehicle with a non-operational electric cooling fan?
- A.
Overheating at highway speeds
- B.
Overheating at low speeds
- C.
Overheating at all speeds
- D.
Lack of heat from the heater core
Correct Answer
B. Overheating at low speedsExplanation
A non-operational electric cooling fan in a vehicle is responsible for cooling the engine and preventing it from overheating. At high speeds, the airflow created by the movement of the vehicle can provide some cooling effect, compensating for the non-functional fan. However, at low speeds, there is less airflow, and the engine relies heavily on the cooling fan. Therefore, if the electric cooling fan is not working, the most likely symptom would be overheating at low speeds when there is insufficient airflow to cool the engine effectively.Rate this question:
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- 14.
The typical recommended mixture of water and antifreeze to form engine coolant is:
- A.
30/70
- B.
50/50
- C.
40/60
- D.
60/40
Correct Answer
B. 50/50Explanation
The recommended mixture of water and antifreeze to form engine coolant is 50/50. This means that the coolant should be a 50% mixture of water and a 50% mixture of antifreeze. This mixture provides the optimal balance of cooling and freeze protection for the engine. Too much water can lead to overheating, while too much antifreeze can reduce the coolant's ability to dissipate heat. Therefore, a 50/50 mixture is the most commonly recommended ratio for engine coolant.Rate this question:
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- 15.
Most manufacturers recommend that cooling systems with conventional (green) antifreeze should be drained, flushed, and filled every:
- A.
Six months
- B.
Yearly
- C.
Two years
- D.
Five years
Correct Answer
C. Two yearsExplanation
Manufacturers recommend that cooling systems with conventional (green) antifreeze should be drained, flushed, and filled every two years. This is because over time, antifreeze can break down and become less effective at preventing corrosion and maintaining proper engine temperature. Regular maintenance of the cooling system helps ensure optimal performance and longevity of the engine.Rate this question:
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- 16.
When pressure testing a cooling system, the pressure applied should be:
- A.
Pumped up as high as possible
- B.
Pumped up to the pressure cap rating
- C.
Pumped up to 10 psi
- D.
Released quickly
Correct Answer
B. Pumped up to the pressure cap ratingExplanation
The correct answer is to pump up the pressure to the pressure cap rating. This is because the pressure cap rating indicates the maximum pressure that the cooling system can handle without causing any damage. Pumping the pressure up to this rating ensures that the system is tested under the conditions it is designed to withstand, without exceeding its limits. Pumping the pressure higher than the pressure cap rating could potentially cause damage to the cooling system.Rate this question:
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- 17.
Technician a says a leaking head gasket could explain the presence of coolant in the eingine's crankcase. Technician B says that coolant that is a milky brown color has been contaminated with either engine or automatic transmission oil. Who is correct?
- A.
A only
- B.
B only
- C.
Both A and B
- D.
Neither A nor B
Correct Answer
C. Both A and BExplanation
Both Technician A and Technician B are correct. Technician A is correct in stating that a leaking head gasket could explain the presence of coolant in the engine's crankcase. A leaking head gasket can cause coolant to mix with the oil, leading to coolant contamination in the crankcase. Technician B is correct in stating that coolant that is a milky brown color indicates contamination with either engine or automatic transmission oil. The milky brown color is a result of the coolant and oil mixing together. Therefore, both technicians are correct in their statements.Rate this question:
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- 18.
Technician A says an electric cooling fan may come on without the ignition being turned on. Technician B says an electric cooling fan may be controlled by the engine control computer. Who is correct?
- A.
A only
- B.
B only
- C.
Both A and B
- D.
Neither A nor B
Correct Answer
C. Both A and BExplanation
Both Technician A and Technician B are correct. An electric cooling fan may come on without the ignition being turned on because it can be controlled by the engine control computer. The engine control computer monitors the engine temperature and activates the cooling fan as needed to prevent overheating, even if the ignition is not turned on. Therefore, both technicians are correct in their statements.Rate this question:
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- 19.
What is a likely harmful effect of engine overheating?
- A.
Damage to combustion chamber parts
- B.
Damage in the crankcase
- C.
Poor gas mileage
- D.
High tailpipe emissions
Correct Answer
A. Damage to combustion chamber partsExplanation
When an engine overheats, the intense heat can cause damage to the combustion chamber parts. The excessive heat can cause warping or cracking of the cylinder head, pistons, and valves. This can lead to a loss of compression, misfires, and ultimately engine failure. Therefore, damage to combustion chamber parts is a likely harmful effect of engine overheating.Rate this question:
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- 20.
What is a likely harmful effect of engine underheating?
- A.
High tailpipe emissions
- B.
Sludge builup in the oil
- C.
Poor gas mileage
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
Underheating of an engine can lead to several harmful effects. Firstly, it can cause high tailpipe emissions as the engine operates inefficiently, resulting in incomplete combustion of fuel and increased production of pollutants. Secondly, underheating can lead to sludge buildup in the oil, as the engine does not reach its optimal operating temperature to burn off impurities. This can reduce the engine's performance and potentially lead to damage. Lastly, underheating can result in poor gas mileage as the engine struggles to reach its optimal efficiency, requiring more fuel to produce the same amount of power.Rate this question:
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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.
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Current Version
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Mar 22, 2023Quiz Edited by
ProProfs Editorial Team -
May 02, 2009Quiz Created by
Ozzzmann
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