UNIT 2 SHIP ENGINE ROOM

What equipment in the engine room generates power?

• Generator

• Pump

• Compressor

• Fuel Tank

Answer explanation

The generator in the engine room is responsible for generating power, while pumps and compressors serve different functions, and the fuel tank stores fuel rather than generating power.

What is the primary function of a marine engine's crankshaft?

• To increase fuel efficiency.

• To regulate engine temperature.

• To control the intake of water.

• To convert linear motion into rotational motion.

Answer explanation

The primary function of a marine engine's crankshaft is to convert linear motion from the pistons into rotational motion, which ultimately drives the engine's output. This is essential for the engine's operation.

What is the component shown in the picture?

• Air Filter

• Oil Pump

• Spark Plug

• Fuel Injector

Answer explanation

The component is the Fuel Injector, which is responsible for delivering fuel into the engine's combustion chamber. It is crucial for the engine's performance, unlike the other options listed.

Explain the role of the turbocharger in a marine engine.

• The turbocharger enhances engine efficiency and power by compressing intake air using exhaust gases.

• The turbocharger reduces engine noise by muffling exhaust sounds.

• The turbocharger increases fuel consumption by requiring more fuel for operation.

• The turbocharger cools the engine by circulating coolant through the intake manifold.

Answer explanation

The turbocharger enhances engine efficiency and power by compressing intake air using exhaust gases, allowing for better combustion and increased performance in marine engines.

What does the term 'scavenge' refer to in engine operation?

• The technique of igniting the fuel-air mixture.

• The method of cooling the engine components.

• The process of removing exhaust gases from the combustion chamber.

• The process of increasing fuel intake in the engine.

Answer explanation

In engine operation, 'scavenge' refers to the process of removing exhaust gases from the combustion chamber. This is crucial for efficient engine performance, allowing fresh air-fuel mixture to enter for the next cycle.

The ____ controls the air pressure needed for engine functions.

Answer explanation

The cooling system is responsible for regulating the engine's temperature, preventing it from overheating during operation. This system circulates coolant to absorb and dissipate heat effectively.

List three main components of a marine propulsion system.

• Battery, Steering Wheel, Rudder

• Generator, Fuel Tank, Deck

• Sail, Hull, Anchor

• Engine, Transmission System, Propeller

Answer explanation

The main components of a marine propulsion system are the Engine, which provides power; the Transmission System, which transfers that power; and the Propeller, which converts it into thrust to move the vessel.

How does the cooling system in a marine engine function?

• The cooling system relies solely on air circulation to maintain engine temperature.

• The cooling system operates by injecting coolant directly into the fuel system.

• The cooling system in a marine engine circulates coolant to absorb heat and releases it through a heat exchanger or radiator.

• The cooling system uses seawater to directly cool the engine without any heat exchange.

Answer explanation

The correct choice explains that the cooling system in a marine engine circulates coolant to absorb heat, which is then released through a heat exchanger or radiator, ensuring efficient temperature regulation.

What is the purpose of the engine's oil pump?

• To filter out impurities from the fuel.

• To control the engine's temperature directly.

• To increase engine speed and power.

• To circulate oil for lubrication and cooling of engine components.

Answer explanation

The engine's oil pump is essential for circulating oil, which lubricates and cools engine components, preventing wear and overheating. This function is crucial for maintaining engine performance and longevity.

Interpret the flow diagram of the fuel system in the marine engine.

• The flow diagram represents the exhaust system routing and components.

• The fuel system diagram shows the path of fuel from the tank to the engine, including the pump, filter, injectors, and rail.

• It details the electrical wiring layout for the ignition system.

• The diagram illustrates the cooling system components of the engine.

Answer explanation

The correct choice explains that the fuel system diagram illustrates the journey of fuel from the tank to the engine, detailing components like the pump, filter, injectors, and rail, which is essential for engine operation.