Take This Gas Engine Trivia Quiz!

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Quizzes Created: 19 | Total Attempts: 53,876
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  • 1/17 Questions

    Name the four strokes of a four-cycle engine in proper order.

    • Compression, power, exhaust, intake
    • Intake, compression, exhaust and power
    • Intake, compression, power and exhaust
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About This Quiz

Do you think you know everything there is to know about gas engines? The "Gas Engine Trivia Quiz" is here to put your knowledge to the test! This quiz is perfect for car enthusiasts, engineering students, and anyone fascinated by the mechanics of gas engines. This quiz will challenge your understanding of automotive engineering.

How familiar are you with See morethe differences between two-stroke and four-stroke engines? Can you name the key components that make gas engines so powerful? The "Gas Engine Trivia Quiz" will push your knowledge to its limits and provide a fun, engaging way to learn more. Take the quiz now, share your score, and challenge your friends to see who knows the most about gas engines!

Take This Gas Engine Trivia Quiz! - Quiz

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  • 2. 

    Name three important intake valve functions.

    • Open, close, open again

    • Must open at correct instant to permit intake of air-fuel mixture; must close at correct time and seal during compression; its shape must be streamlined so flow of gases into combustion chamber will not be obstructed.

    • Must open at the correct time and close when the airflow is diminished

    Correct Answer
    A. Must open at correct instant to permit intake of air-fuel mixture; must close at correct time and seal during compression; its shape must be streamlined so flow of gases into combustion chamber will not be obstructed.
    Explanation
    The three important intake valve functions are:
    1. Opening at the correct instant to allow the intake of air-fuel mixture.
    2. Closing at the correct time and sealing during compression.
    3. Having a streamlined shape to ensure smooth flow of gases into the combustion chamber without obstruction.

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  • 3. 

    Explain why a 4-cycle engine runs cooler than a 2-cycle engine.

    • There are half as many power strokes, and the valves dissipate heat through seats and guides.

    • Burned gases are also removed before a fresh charge is introduced.

    • There are half as many power strokes, and the valves dissipate heat through seats and guides. Burned gases are also removed before a fresh charge is introduced.

    Correct Answer
    A. There are half as many power strokes, and the valves dissipate heat through seats and guides. Burned gases are also removed before a fresh charge is introduced.
    Explanation
    A 4-cycle engine runs cooler than a 2-cycle engine because it has half as many power strokes. In a 4-cycle engine, the valves dissipate heat through seats and guides, which helps in cooling the engine. Additionally, in a 4-cycle engine, the burned gases are removed before a fresh charge is introduced, further aiding in cooling the engine.

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  • 4. 

    Why is there a difference in temperature between the intake and exhaust valves?

    • Outgoing air-fuel mixture tends to heat intake valve during operation

    • Incoming air-fuel mixture tends to cool intake valve during operation

    • Incoming air-fuel mixture tends to heat intake valve during operation

    Correct Answer
    A. Incoming air-fuel mixture tends to cool intake valve during operation
    Explanation
    During operation, the incoming air-fuel mixture tends to cool the intake valve. This is because the air-fuel mixture is at a lower temperature compared to the hot exhaust gases that are expelled from the engine through the exhaust valve. As the cooler air-fuel mixture flows into the intake valve, it absorbs some of the heat from the valve, causing a temperature difference between the intake and exhaust valves.

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  • 5. 

    The exhaust valve is cooled mainly by _____________.

    • Radiation

    • Conduction

    • Convection

    Correct Answer
    A. Conduction
    Explanation
    The exhaust valve is cooled mainly by conduction. Conduction is the transfer of heat through direct contact between two objects. In the case of the exhaust valve, it comes into contact with the cooler engine components, such as the cylinder head or coolant passages, which helps to dissipate heat. This direct transfer of heat through conduction allows the exhaust valve to cool down efficiently and prevent overheating.

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  • 6. 

    How does compression increase engine power?

    • When atoms that make up molecules of air and fuel are squeezed close together, heat energy is created. Then, tightly packed molecules try to move apart. This energy, combined with the expanding energy of combustion, provides power.

    • Compression adds more pressure to the crankshaft, thus increasing power.

    • Compression adds more power to the camshaft, thus increasing torque and power.

    Correct Answer
    A. When atoms that make up molecules of air and fuel are squeezed close together, heat energy is created. Then, tightly packed molecules try to move apart. This energy, combined with the expanding energy of combustion, provides power.
    Explanation
    Compression increases engine power by squeezing the atoms that make up molecules of air and fuel close together, creating heat energy. As a result, the tightly packed molecules try to move apart, generating energy. This energy, combined with the expanding energy of combustion, ultimately provides power to the engine.

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  • 7. 

    The compression ratio must be limited in gasoline spark ignition engines, because__________

    • The engine becomes too difficult to start.

    • There is no power advantage after compressing the fuel to a certain point.

    • The heat of compression will ignite the air-fuel mixture too soon.

    Correct Answer
    A. The heat of compression will ignite the air-fuel mixture too soon.
    Explanation
    The compression ratio must be limited in gasoline spark ignition engines because the heat generated during compression can cause the air-fuel mixture to ignite prematurely. This can lead to knocking or pinging, which can damage the engine and decrease its efficiency. By limiting the compression ratio, the heat of compression is kept at a level where the air-fuel mixture ignites at the optimal time, resulting in smoother combustion and improved engine performance.

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  • 8. 

    What are the two methods employed for lubricating four-cycle engines?

    • The fuel and pump system

    • The splash system and the pump system

    • The splash system and the electronic system

    Correct Answer
    A. The splash system and the pump system
    Explanation
    The correct answer is the splash system and the pump system. In four-cycle engines, lubrication is essential to reduce friction and wear between moving parts. The splash system involves the use of oil that is splashed or sprayed onto the various engine components, such as the crankshaft and cylinder walls, by the rotating parts. This ensures that the moving parts are adequately lubricated. On the other hand, the pump system uses an oil pump to circulate oil throughout the engine, ensuring a constant supply of lubrication to all necessary areas. Both methods work together to provide effective lubrication in four-cycle engines.

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  • 9. 

    What are the two types of scavenging systems used in two-cycle engines?

    • The cross-scavenged and the loop-scavenged

    • The cross-splash and the loop cylinder

    • The sound wave and valve overlap

    Correct Answer
    A. The cross-scavenged and the loop-scavenged
    Explanation
    The two types of scavenging systems used in two-cycle engines are the cross-scavenged and the loop-scavenged. These systems refer to the way in which air and fuel are circulated within the engine. In a cross-scavenged system, the incoming air-fuel mixture flows across the cylinder and exits through ports on the opposite side. In a loop-scavenged system, the mixture enters the cylinder from one side and exits through ports on the same side. These different scavenging systems have implications for the engine's performance, efficiency, and emissions.

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  • 10. 

    Why can two-cycle engines be run in any position?

    • Because there is no oil in the fuel that passes through the engine.

    • Because they get adequate lubrication as fuel mixed with oil is passed through the engine.

    • Because the is no fuel mixed with the oil that passed through the engine.

    Correct Answer
    A. Because they get adequate lubrication as fuel mixed with oil is passed through the engine.
    Explanation
    Two-cycle engines can be run in any position because they get adequate lubrication as fuel mixed with oil is passed through the engine. Unlike four-cycle engines, two-cycle engines do not have a separate oil reservoir. Instead, the oil is mixed with the fuel, and as the fuel passes through the engine, it provides lubrication to the moving parts. This design allows the engine to operate in different positions without compromising its lubrication system.

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  • 11. 

    Name three valving systems employed in two-cycle engines.

    • Fuel mixture, valve overlap

    • Intake system, output system and conduction system

    • Rotary valve system, reed valve system, the loop-scavenged system

    Correct Answer
    A. Rotary valve system, reed valve system, the loop-scavenged system
    Explanation
    The correct answer is the rotary valve system, reed valve system, and the loop-scavenged system. These are three valving systems commonly used in two-cycle engines. The rotary valve system uses a rotating valve to control the intake and exhaust of gases. The reed valve system uses thin, flexible reeds to regulate the flow of air and fuel mixture. The loop-scavenged system uses the motion of the piston to create a loop of fresh air and fuel mixture for efficient combustion. These systems play a crucial role in the operation and performance of two-cycle engines.

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  • 12. 

    The baffle on the contoured piston is for ____________.

    • Directing the flow of air-fuel mixture upward in the cylinder.

    • Slowing the air-fuel mixture entering the combustion chamber.

    • Directing oil evenly to the cylinder walls.

    Correct Answer
    A. Directing the flow of air-fuel mixture upward in the cylinder.
    Explanation
    The baffle on the contoured piston is designed to direct the flow of the air-fuel mixture upward in the cylinder. This helps to improve the combustion process by ensuring that the mixture is evenly distributed and properly mixed before ignition. By directing the flow upward, the baffle helps to create a more efficient and effective combustion, resulting in better engine performance and fuel efficiency.

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  • 13. 

    The ___________  ___________  type of 2-cycle engines requires a contoured piston.

    • Air flow

    • Piston engine

    • Cross-scavanged

    Correct Answer
    A. Cross-scavanged
    Explanation
    Cross-scavenged is the correct answer because in a cross-scavenged type of 2-cycle engine, the air-fuel mixture flows across the cylinder horizontally, rather than vertically. This requires a contoured piston to effectively control the flow of the mixture and optimize combustion.

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  • 14. 

    In a properly tuned exhaust system, ________ _______ prevent the air-fuel mixture from leaving with the exhaust.

    • Cross-scavanged

    • Sound waves

    • Air flow

    Correct Answer
    A. Sound waves
    Explanation
    In a properly tuned exhaust system, sound waves are used to prevent the air-fuel mixture from leaving with the exhaust. This is achieved through the design and positioning of the exhaust pipes and mufflers. The sound waves created by the engine's combustion process are reflected and redirected within the exhaust system, creating pressure waves that help to push the exhaust gases out while preventing the air-fuel mixture from escaping.

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  • 15. 

    What advantage is there in having the intake port lead directly into the crankshaft?

    • Charge of fuel and oil lubricates ball and needle bearings until piston opens transfer ports on down-stroke.

    • Charge of oil lubricates ball and needle bearings until piston opens transfer ports on down-stroke.

    • Charge of fuel ball and needle bearings until piston opens transfer ports on down-stroke.

    Correct Answer
    A. Charge of fuel and oil lubricates ball and needle bearings until piston opens transfer ports on down-stroke.
    Explanation
    Having the intake port lead directly into the crankshaft allows for the charge of fuel and oil to lubricate the ball and needle bearings until the piston opens the transfer ports on the down-stroke. This ensures that the bearings are properly lubricated, reducing friction and wear, and improving the overall efficiency and performance of the engine.

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  • 16. 

    Time during the four-stroke cycle when both valves are open is called __________________.

    • Piston overlap

    • Valve overlap

    • Fuel overlap

    Correct Answer
    A. Valve overlap
    Explanation
    Valve overlap refers to the period during the four-stroke cycle of an engine when both the intake and exhaust valves are open simultaneously. This allows for the smooth transition of the exhaust gases out of the cylinder and the intake of the fresh air-fuel mixture. It helps in improving engine efficiency and performance by maximizing the scavenging effect and ensuring proper combustion.

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  • 17. 

    A four-cycle engine accelerates slower than a two-cycle engine because ___________________.

    • There is only one power stroke in four

    • The flywheel is heavier to carry the engine through three nonpower strokes

    • There are more moving parts to be driven by the engine

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    The correct answer is "All of the above." A four-cycle engine accelerates slower than a two-cycle engine because there is only one power stroke in four, the flywheel is heavier to carry the engine through three nonpower strokes, and there are more moving parts to be driven by the engine.

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  • Current Version
  • Sep 16, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Nov 10, 2011
    Quiz Created by
    Tkblaylock

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