Automotive Systems, Quiz Yourself 5

2.

Does a two-stroke-cycle engine produce more power than a four-stroke-cycle engine?

Yes
No
Maybe

Correct Answer

A. Yes

Explanation

A two-stroke-cycle engine does produce more power than a four-stroke-cycle engine. This is because a two-stroke engine completes a power cycle in just two strokes of the piston (one upstroke and one downstroke), while a four-stroke engine requires four strokes (intake, compression, power, and exhaust). The shorter time required for the power cycle in a two-stroke engine allows it to produce power more frequently, resulting in higher power output compared to a four-stroke engine.

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3.

How many events does a diesel engine have to complete one cycle of operation?

Six
Eight
Three

Correct Answer

A. Six

Explanation

A diesel engine completes one cycle of operation in six events. These events include intake, compression, combustion, expansion, exhaust, and scavenging. During the intake event, air is drawn into the engine. In the compression event, the air is compressed. Combustion occurs when fuel is injected and ignited, leading to the expansion event. The exhaust event involves the expulsion of waste gases. Finally, in the scavenging event, fresh air is introduced to clear out any remaining exhaust gases. Therefore, a diesel engine requires six events to complete one cycle of operation.

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4.

What does the two-stroke-cycle engine require that the four-stroke-cycle engine does not?

Exhaust valve
Boiler
Blower

Correct Answer

A. Blower

Explanation

The two-stroke-cycle engine requires a blower, which is not needed in a four-stroke-cycle engine. The blower helps in the process of scavenging, where fresh air-fuel mixture is forced into the combustion chamber and exhaust gases are expelled. This is necessary because in a two-stroke-cycle engine, the intake and exhaust processes occur simultaneously, while in a four-stroke-cycle engine, they occur in separate strokes. Therefore, the blower is essential for the proper functioning of a two-stroke-cycle engine.

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5.

How many power strokes are produced by one revolution of the crankshaft in a two-stroke-cycle engine?

Four
Two
One

Correct Answer

A. One

Explanation

In a two-stroke-cycle engine, one revolution of the crankshaft produces only one power stroke. This is because the two-stroke-cycle engine completes both the intake and exhaust strokes in the same revolution as the compression and power strokes. Therefore, the piston fires and generates power only once per revolution of the crankshaft.

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1

6.

A two-stroke-cycle engine produces less power per stroke than a four-stroke-cycle engine because it has less ---

Air
Fuel
Volume

Correct Answer

A. Air

Explanation

A two-stroke-cycle engine produces less power per stroke than a four-stroke-cycle engine because it has less air. In a two-stroke engine, the air-fuel mixture is compressed and ignited in every revolution of the engine, resulting in a quicker combustion process. This means that there is less time for the air to enter the cylinder, resulting in a lower volume of air available for combustion. As a result, the engine produces less power per stroke compared to a four-stroke engine, which allows more time for the air to enter the cylinder and achieve a higher volume of air for combustion.

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2

Automotive Systems, Quiz Yourself 5

The four events in a two-stroke-cycle engine are:

Quiz Preview

Does a two-stroke-cycle engine produce more power than a four-stroke-cycle engine?

How many events does a diesel engine have to complete one cycle of operation?

What does the two-stroke-cycle engine require that the four-stroke-cycle engine does not?

How many power strokes are produced by one revolution of the crankshaft in a two-stroke-cycle engine?

A two-stroke-cycle engine produces less power per stroke than a four-stroke-cycle engine because it has less ---