Engine

Which component of the engine management system is primarily responsible for controlling fuel injection timing and quantity?

• Oxygen sensor

• Engine Control Unit (ECU)

• Throttle body

• Fuel pump

What distinguishes Direct Injection from Port Injection in fuel delivery systems?

• Direct Injection delivers fuel directly into the combustion chamber, while Port Injection delivers it into the intake manifold

• Port Injection is more fuel-efficient than Direct Injection

• Direct Injection is only used in diesel engines

• Port Injection uses higher pressure than Direct Injection

Why is it important for an Engine Control Unit (ECU) to monitor and adjust the air-to-fuel ratio?

• To ensure the vehicle can reach maximum speeds

• To maintain optimal engine temperature

• To optimize engine performance and fuel efficiency

• To increase the loudness of the exhaust system

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What is the effect of a fouled spark plug on engine performance?

• It improves engine performance

• It has no effect

• It can cause the engine to run rough or misfire

• It increases the engine's horsepower

How does an Engine Control Unit (ECU) adjust ignition timing based on driving conditions?

• By changing the fuel type used in the engine

• By mechanically adjusting the distributor

• By altering the spark plug gap

• By processing data from various sensors and adjusting the timing electronically

What is the primary purpose of a turbocharger in an engine?

• To increase fuel efficiency by reducing engine size

• To reduce emissions by controlling exhaust flow

• To increase engine power by forcing more air into the combustion chamber

• To cool the engine by circulating extra air

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What is the primary function of a heat engine?

• To convert thermal energy into mechanical work.

• To transfer heat from a cooler reservoir to a warmer one without doing work.

• To decrease the entropy of a system to zero.

• To convert all absorbed heat into work without any losses.

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What is the main advantage of using an Engine Control Unit (ECU) in modern vehicles?

• It allows for manual control of the engine's functions

• It increases the vehicle's top speed

• It optimizes engine performance and fuel efficiency

• It reduces the need for regular maintenance

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Which type of fuel injection system uses a common rail to supply fuel to the injectors?

• Direct Injection

• Port Injection

• Sequential Fuel Injection

• Common Rail Direct Injection (CRDI)

A four-stroke cycle engine is an internal combustion engine that utilizes four distinct piston strokes to complete one operating cycle. What are the 4 basic steps in the correct order?

• Intake, Power , Compression, Exhaust

• Compression, Power, Intake, Exhaust

• Intake, Exhaust, Compression, Power

• Intake, Compression, Power, Exhaust