# Small Engine Parts And Functions Quiz! Trivia

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| By Dabartl1
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Dabartl1
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Quizzes Created: 3 | Total Attempts: 11,973
Questions: 10 | Attempts: 8,593

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• 1.

### How many revolutions of the crankshaft are in a complete cycle for a 4-stroke-cycle engine?

• A.

1

• B.

2

• C.

3

• D.

4

B. 2
Explanation
In a 4-stroke-cycle engine, there are two revolutions of the crankshaft in a complete cycle. During the first revolution, the piston moves downward (intake stroke) and then upward (compression stroke). The second revolution involves the downward movement of the piston (power stroke) and then the upward movement again (exhaust stroke). This completes one cycle of the engine, and therefore, there are two revolutions of the crankshaft.

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• 2.

### How many revolutions of the crank shaft are in a complete cycle for a 2-stroke-cycle engine?

• A.

0

• B.

1

• C.

4

• D.

12

B. 1
Explanation
In a 2-stroke-cycle engine, the crankshaft completes one revolution in a complete cycle. This is because the 2-stroke-cycle engine only requires two strokes of the piston - the intake/compression stroke and the power/exhaust stroke - to complete a full cycle. Therefore, the crankshaft only needs to rotate once to complete the cycle.

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• 3.

### The crankshaft has large lobes that act as counterweights, continuing centrifugal force to keep the crank turning after the explosion of the fuel.

• A.

True

• B.

False

• C.

Not enough information given

A. True
Explanation
The statement is true because the crankshaft does indeed have large lobes that act as counterweights. These counterweights help to balance the rotating mass of the crankshaft and the reciprocating mass of the pistons and connecting rods. Additionally, the centrifugal force generated by these counterweights helps to keep the crankshaft rotating smoothly after the explosion of the fuel in the engine.

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• 4.

### Three key differences between the diesel and the gasoline 4-stroke-cycle engines are: Diesel is heavier construction, Diesel has a higher compression ratio, and _______

• A.

Diesel always uses a carburetor

• B.

Diesel combustion occurs because of intense heat and pressure added to the fuel and air

• C.

Gasoline combustion requires a fuel injector to create the spark

• D.

Diesel engines have oversized spark plugs

B. Diesel combustion occurs because of intense heat and pressure added to the fuel and air
Explanation
The third key difference between diesel and gasoline 4-stroke-cycle engines is that diesel combustion occurs because of intense heat and pressure added to the fuel and air. This is in contrast to gasoline engines, which require a fuel injector to create the spark for combustion.

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• 5.

### Air-cooled small gas engines are cooled by:

• A.

Oil

• B.

Fins

• C.

Flywheel

• D.

Air

• E.

All of the above

E. All of the above
Explanation
Air-cooled small gas engines are cooled by a combination of oil, fins, flywheel, and air. Oil helps to lubricate the moving parts of the engine and also aids in dissipating heat. Fins are designed to increase the surface area of the engine, allowing for better heat dissipation. The flywheel, which is attached to the engine's crankshaft, helps to circulate air and cool the engine. Lastly, air plays a crucial role in cooling the engine by carrying away heat from the engine's components. Therefore, all of the mentioned options contribute to the cooling process of air-cooled small gas engines.

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• 6.

### The four strokes in order for a 4-stroke-cycle engine are:

• A.

Intake, compression, power, exhaust

• B.

Intake, exhaust, power, compression

• C.

Exhaust exhaust intake power

• D.

None of the above

A. Intake, compression, power, exhaust
Explanation
In a 4-stroke-cycle engine, the intake stroke is the first stroke where the piston moves downward, drawing in a mixture of fuel and air into the combustion chamber. The compression stroke follows, where the piston moves upward, compressing the fuel-air mixture. Next is the power stroke, where the compressed mixture is ignited by a spark plug, causing an explosion that forces the piston downward with great force. Finally, the exhaust stroke occurs, where the piston moves upward again, pushing the burned gases out of the combustion chamber and through the exhaust valve.

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• 7.

### A 2-stoke-cycle engine is likely to be found on:

• A.

Subcompact cars built in Greenland

• B.

Chainsaws and weed trimmers

• C.

Mazda RX-9

• D.

Most lawnmowers and snowblowers

B. Chainsaws and weed trimmers
Explanation
A 2-stroke-cycle engine is likely to be found on chainsaws and weed trimmers because these tools require a lightweight and compact engine that can provide high power-to-weight ratio. 2-stroke-cycle engines are known for their simplicity, low weight, and high power output, making them suitable for handheld tools like chainsaws and weed trimmers. They are less likely to be found on subcompact cars, Mazda RX-9, lawnmowers, or snowblowers, as these require larger and more complex engines.

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• 8.

### To describe a 2-stoke-cycle engine function, understand that:

• A.

The piston lowers allowing exhaust to exit the exhaust port just prior to intake port opening to allow air/fuel/oil into the cylinder.

• B.

The piston raises to the top allowing exhaust to exit the exhaust port just prior to intake port opening to allow air/fuel/oil into the cylinder.

• C.

Blue and Yellow make Green.

• D.

The piston is attached to the head by the valve keeper.

A. The piston lowers allowing exhaust to exit the exhaust port just prior to intake port opening to allow air/fuel/oil into the cylinder.
Explanation
The correct answer describes the function of a 2-stroke cycle engine. It states that the piston lowers, allowing the exhaust to exit the exhaust port just before the intake port opens. This creates a space for air/fuel/oil mixture to enter the cylinder. This explanation accurately describes the process of the intake and exhaust cycle in a 2-stroke engine.

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• 9.

### Two parts of the camshaft are:  timing gear and ________________________.

cam lobes
Explanation
The two parts of the camshaft are the timing gear and cam lobes. The timing gear is responsible for synchronizing the rotation of the camshaft with the crankshaft, ensuring proper timing of the engine's valves. On the other hand, the cam lobes are the raised, egg-shaped sections on the camshaft that interact with the engine's valves. As the camshaft rotates, the cam lobes push against the valves, opening and closing them at the correct intervals to allow fuel and air into the cylinders and exhaust gases out.

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• 10.

### A _____________________________ or supercharger uses the exhaust to blow in more air into the cylinder.

turbo
turbo charger
Explanation
A turbocharger or supercharger is a device that utilizes the exhaust gases to force more air into the cylinder. This process increases the amount of oxygen available for combustion, resulting in improved engine performance and power output. The turbocharger specifically operates by utilizing a turbine to harness the exhaust gas energy and drive a compressor, which then pressurizes the intake air. Similarly, a supercharger also increases air intake by using a belt-driven compressor. Both turbochargers and superchargers are commonly used in automotive engines to enhance their efficiency and overall performance.

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• Current Version
• Mar 22, 2023
Quiz Edited by
ProProfs Editorial Team
• Sep 21, 2009
Quiz Created by
Dabartl1

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