Take This Gas Engine Trivia Quiz!
The world today is undergoing a big threat all these thanks to the carbon print that we are leaving every day. Some of this is due to the dangerous chemicals we let out to the world that is destroying the ozone layer. One of the best inventions to combat this is the gas engines. Take this gas engine trivia quiz and get to see just how much you understand how it works.
- 1.
Name the four strokes of a four-cycle engine in proper order.
- A.
Compression, power, exhaust, intake
- B.
Intake, compression, exhaust and power
- C.
Intake, compression, power and exhaust
Correct Answer
C. Intake, compression, power and exhaustExplanation
The four strokes of a four-cycle engine are intake, compression, power, and exhaust. During the intake stroke, the fuel-air mixture is drawn into the cylinder. In the compression stroke, the mixture is compressed by the upward movement of the piston. The power stroke is when the spark plug ignites the compressed mixture, causing an explosion and pushing the piston downward. Finally, in the exhaust stroke, the burned gases are expelled from the cylinder.Rate this question:
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- 2.
Name three important intake valve functions.
- A.
Open, close, open again
- B.
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.
- C.
Must open at the correct time and close when the airflow is diminished
Correct Answer
B. 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.Rate this question:
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- 3.
Explain why a 4-cycle engine runs cooler than a 2-cycle engine.
- A.
There are half as many power strokes, and the valves dissipate heat through seats and guides.
- B.
Burned gases are also removed before a fresh charge is introduced.
- C.
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
C. 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.Rate this question:
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- 4.
Why is there a difference in temperature between the intake and exhaust valves.
- A.
Outgoing air-fuel mixture tends to heat intake valve during operation
- B.
Incoming air-fuel mixture tends to cool intake valve during operation
- C.
Incoming air-fuel mixture tends to heat intake valve during operation
Correct Answer
B. Incoming air-fuel mixture tends to cool intake valve during operationExplanation
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.Rate this question:
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- 5.
The exhaust valve is cooled mainly by _____________.
- A.
Radiation
- B.
Conduction
- C.
Convection
Correct Answer
B. ConductionExplanation
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.Rate this question:
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- 6.
How does compression increase engine power?
- 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.
- B.
Compression adds more pressure to the crankshaft, thus increasing power.
- C.
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.Rate this question:
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- 7.
The compression ratio must be limited in gasoline spark ignition engines, because__________
- A.
The engine becomes too difficult to start.
- B.
There is no power advantage after compressing the fuel to a certain point.
- C.
The heat of compression will ignite the air-fuel mixture too soon.
Correct Answer
C. 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.Rate this question:
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- 8.
What are the two methods employed for lubricating four-cycle engines?
- A.
The fuel and pump system
- B.
The splash system and the pump system
- C.
The splash system and the electronic system
Correct Answer
B. The splash system and the pump systemExplanation
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.Rate this question:
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- 9.
What are the two types of scavenging systems used in two-cycle engines?
- A.
The cross-scavenged and the loop-scavenged
- B.
The cross-splash and the loop cylinder
- C.
The sound wave and valve overlap
Correct Answer
A. The cross-scavenged and the loop-scavengedExplanation
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.Rate this question:
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- 10.
Why can two-cycle engines be run in any position?
- A.
Because there is no oil in the fuel that passes through the engine.
- B.
Because they get adequate lubrication as fuel mixed with oil is passed through the engine.
- C.
Because the is no fuel mixed with the oil that passed through the engine.
Correct Answer
B. 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.Rate this question:
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- 11.
Name three valving systems employed in two-cycle engines.
- A.
Fuel mixture, valve overlap
- B.
Intake system, output system and conduction system
- C.
Rotary valve system, reed valve system, the loop-scavenged system
Correct Answer
C. Rotary valve system, reed valve system, the loop-scavenged systemExplanation
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.Rate this question:
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- 12.
The baffle on the contoured piston is for ____________.
- A.
Directing the flow of air-fuel mixture upward in the cylinder.
- B.
Slowing the air-fuel mixture entering the combustion chamber.
- C.
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.Rate this question:
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- 13.
The ___________ ___________ type of 2-cycle engines requires a contoured piston.
- A.
Air flow
- B.
Piston engine
- C.
Cross-scavanged
Correct Answer
C. Cross-scavangedExplanation
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.Rate this question:
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- 14.
In a properly tuned exhaust system, ________ _______ prevent the air-fuel mixture from leaving with the exhaust.
- A.
Cross-scavanged
- B.
Sound waves
- C.
Air flow
Correct Answer
B. Sound wavesExplanation
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.Rate this question:
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- 15.
What advantage is there in having the intake port lead directly into the crankshaft?
- A.
Charge of fuel and oil lubricates ball and needle bearings until piston opens transfer ports on down-stroke.
- B.
Charge of oil lubricates ball and needle bearings until piston opens transfer ports on down-stroke.
- C.
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.Rate this question:
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- 16.
Time during the four-stroke cycle when both valves are open is called __________________.
- A.
Piston overlap
- B.
Valve overlap
- C.
Fuel overlap
Correct Answer
B. Valve overlapExplanation
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.Rate this question:
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- 17.
A four-cycle engine accerlerates slower than a two-cycle engine because___________________/
- A.
There is only one power stroke in four
- B.
The flywheel is heavier to carry the engine through three nonpower strokes
- C.
There are more moving parts to be driven by the engine
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
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.Rate this question:
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Mar 20, 2023Quiz Edited by
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Nov 10, 2011Quiz Created by
Tkblaylock