Understanding Intake Systems and Components

Which of the following is a type of intake system commonly used in internal combustion engines?

• Turbocharged intake system

• Hydraulic intake system

• Pneumatic brake system

• Exhaust gas recirculation system

What is the primary function of an air filter in an intake system?

• To cool the engine

• To remove contaminants from incoming air

• To increase fuel pressure

• To lubricate engine parts

Which component is responsible for delivering fuel into the intake manifold in a modern fuel-injected engine?

• Carburetor

• Fuel injector

• Throttle body

• Air filter

Which of the following is NOT a component of a typical intake system?

• Intake manifold

• Air filter

• Fuel tank

• Throttle body

What is the main purpose of the intake manifold in an engine?

• To distribute air-fuel mixture to the cylinders

• To store fuel

• To cool the engine

• To expel exhaust gases

A student observes that an engine’s performance drops on a hot day. Using your knowledge of intake temperature effects, explain why this occurs and suggest a modification to the intake system to mitigate this issue.

• Hot air is denser, so less oxygen enters the engine; installing a larger air filter will help.

• Hot air is less dense, so less oxygen enters the engine; using a cold air intake can help increase performance.

• Hot air is less dense, so more oxygen enters the engine; using a smaller intake manifold will help.

• Hot air is denser, so more oxygen enters the engine; using a turbocharger will help.

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Given two intake manifold designs—one with long, narrow runners and one with short, wide runners—analyze which design would be more suitable for low-end torque and justify your answer.

• Short, wide runners are better for low-end torque because they increase air velocity.

• Long, narrow runners are better for low-end torque because they increase air velocity and improve cylinder filling at low RPM.

• Short, wide runners are better for high-end power because they decrease air velocity.

• Long, narrow runners are better for high-end power because they decrease air velocity.

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A vehicle is experiencing poor fuel economy and increased emissions. Using your understanding of intake system components, reason which component is most likely malfunctioning and explain why.

• Air filter, because a clogged filter restricts airflow, causing rich fuel mixtures.

• Intake manifold, because a cracked manifold increases fuel pressure.

• Fuel injector, because a leaking injector causes lean mixtures.

• Throttle body, because a stuck throttle increases air intake.

A technician wants to increase the engine’s power output at high RPM. Which intake system modification should they consider, and what is the reasoning behind it?

• Use longer intake runners to increase air velocity at high RPM.

• Use shorter, wider intake runners to reduce air resistance and increase airflow at high RPM.

• Install a more restrictive air filter to increase air pressure.

• Reduce the size of the throttle body to limit airflow.

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A car’s engine is running rough and misfiring. After inspection, the fuel injectors are found to be clogged. Explain how this affects the intake system’s function and engine performance.

• Clogged injectors reduce fuel delivery, causing a lean mixture and misfires.

• Clogged injectors increase air intake, causing a rich mixture and smooth running.

• Clogged injectors increase fuel delivery, causing a rich mixture and misfires.

• Clogged injectors have no effect on engine performance.