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Difficulty: EasyEngine Principles and Internal Components

As a gasoline engine operates, fresh air and fuel enter the cylinder while the piston travels downward from top dead center. Which phase of the engine cycle is taking place during this action?

  1. A
    Compression stroke
  2. Intake strokeAnswer
  3. C
    Power stroke
  4. D
    Exhaust stroke

Answer

The intake stroke is the phase where the intake valve opens and downward piston motion draws the air-fuel mixture into the cylinder.
The correct answer describes the intake stroke. During the intake stroke, the intake valve opens while the exhaust valve remains closed. As the piston travels downward from top dead center toward bottom dead center, it creates a low-pressure area inside the cylinder that draws in the fresh air-fuel mixture.

Step-by-Step Solution

1
Identify the valve and piston positions described in the question.
The piston is moving downward from top dead center and drawing fresh air and fuel into the cylinder.
Understanding the physical motion and fluid flow defines which stroke is active.
2
Match these conditions to the corresponding phase of the four-stroke cycle.
The intake stroke is specifically responsible for drawing in the combustible air-fuel charge.
The four strokes occur in sequence: intake (draw in mixture), compression (squeeze mixture), power (combustion expansion), and exhaust (expel spent gases).

Key Concept

Four-stroke engine operating cycle and the specific function of the intake stroke.
Estimated Time:45s
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Topics

Engine Principles and Internal Components

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