MDE 1 Q2,3

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Penetration in Fuel Combustion

Question: What does the term "penetration" refer to in the context of fuel combustion in a marine diesel engine?

D) The amount of fuel that evaporates before reaching the combustion chamber

A) The ability of the fuel to mix with air before combustion

C) The process of breaking down fuel into smaller droplets for better combustion

B) The distance fuel droplets travel into the combustion chamber before igniting

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Atomization in Fuel Combustion

Question: What is meant by the term "atomization" in the context of fuel combustion in a marine diesel engine?

D) The cooling of fuel before it enters the combustion chamber

A) The process of mixing fuel with air to create a combustible mixture

B) The conversion of fuel into fine droplets to enhance combustion efficiency

C) The compression of fuel to increase its energy density

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Components in a Cross-Section of a Four-Stroke Diesel Engine Piston

Question: In a cross-section view of a four-stroke diesel engine piston, which of the following components are typically visible?

A) Piston crown, piston rings, and piston skirt

D) Exhaust valve, rocker arm, and valve spring

C) Fuel injector, turbocharger, and intake valve

B) Camshaft, crankshaft, and connecting rod

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Factors Influencing Atomization

Question: Which of the following factors influence the atomization of fuel in a marine diesel engine?

A) Fuel temperature and injection pressure

D) Combustion chamber design and exhaust temperature

C) Fuel viscosity and piston speed

B) Engine speed and air-fuel ratio

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Factors Influencing Compression Ratio

Question: Which of the following factors primarily influence the compression ratio in a marine diesel engine?

A) Cylinder volume and piston design

C) Engine speed and fuel injection timing

B) Fuel type and turbocharger pressure

D) Air temperature and exhaust manifold design

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Transfer of Gas Force from Piston Crown to Crankshaft

Question: How is the force generated by the combustion gases transferred from the piston crown to the crankshaft in a four-stroke diesel engine?

B) Directly through the piston rings which transfer force to the crankshaft

C) Via the camshaft which then drives the crankshaft

A) Through the connecting rod which converts the linear motion of the piston into rotational motion

D) Through the exhaust valves which push the crankshaft

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Factors Influencing Penetration

Question: Which of the following factors primarily influence the penetration of fuel in the combustion chamber of a marine diesel engine?

B) Engine speed and intake air temperature

A) Fuel temperature and injector nozzle design

D) Compression ratio and turbocharger boost

C) Fuel density and exhaust pressure

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Compression Ratio in Fuel Combustion

Question: What does the term "compression ratio" refer to in the context of fuel combustion in a marine diesel engine?

B) The ratio of the engine's power output to the fuel consumption rate

D) The ratio of the amount of fuel injected to the amount of air compressed

A) The ratio of the volume of fuel to the volume of air in the combustion chamber

C) The ratio of the maximum to the minimum volume of the combustion chamber during the engine cycle

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