MDE 1 End of Unit Quiz

MDE 1 End Of Unit Quiz

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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?

B) Camshaft, crankshaft, and connecting rod

D) Exhaust valve, rocker arm, and valve spring

A) Piston crown, piston rings, and piston skirt

C) Fuel injector, turbocharger, and intake valve

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Factors Influencing Atomization

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

D) Combustion chamber design and exhaust temperature

C) Fuel viscosity and piston speed

A) Fuel temperature and injection pressure

B) Engine speed and air-fuel ratio

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8. Intake Stroke in Diesel vs. Gasoline Engines

Question: How does the intake stroke in a marine diesel engine differ from that in a gasoline engine?

A) Diesel engines intake pure air, while gasoline engines intake an air-fuel mixture

B) Diesel engines intake an air-fuel mixture, while gasoline engines intake pure air

C) Both engines intake an air-fuel mixture

D) Both engines intake pure air

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1. Purpose of the Compression Stroke

Question: What is the primary purpose of the compression stroke in a four-stroke marine diesel engine?

D) To draw fresh air into the cylinder

A) To expel exhaust gases from the cylinder

B) To ignite the air-fuel mixture

C) To compress the air in the cylinder

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1. Purpose of the Intake Stroke

Question: What is the primary purpose of the intake stroke in a four-stroke marine diesel engine?

A) To compress the air-fuel mixture

C) To draw fresh air into the cylinder

B) To ignite the air-fuel mixture

D) To expel exhaust gases from the cylinder

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5. Pressure Changes During Exhaust Stroke

Question: What happens to the pressure inside the cylinder during the exhaust stroke of a four-stroke marine diesel engine?

D) It fluctuates randomly

A) It increases significantly

B) It remains constant

C) It decreases as the piston moves upward

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5. Exhaust Systems

Question: What is the primary purpose of the exhaust valve in a marine diesel engine?

D) To control the engine speed

B) To intake fresh air into the cylinder

C) To mix fuel with air

A) To release burned gases from the combustion chamber

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Working Principle of the Four-Stroke Cycle

Question: Which of the following correctly describes the working principle of the four-stroke cycle in a marine diesel engine?

B) Compression, Power, Exhaust, Intake

A) Intake, Compression, Ignition, Exhaust

D) Power, Exhaust, Compression, Intake

C) Intake, Compression, Power, Exhaust

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6. Pressure in the Cylinder During Intake

Question: What happens to the pressure inside the cylinder during the intake stroke of a four-stroke marine diesel engine?

A) It increases significantly

C) It remains constant

D) It becomes higher than the atmospheric pressure

B) It decreases slightly

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7. Significance of the Intake Stroke

Question: Why is the intake stroke crucial for the operation of a four-stroke marine diesel engine?

D) It determines the engine’s fuel efficiency

B) It ensures the cylinder is filled with a fresh charge of air for combustion

C) It controls the engine speed

A) It initiates the ignition process

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8. Temperature Changes During Power Stroke

Question: What happens to the temperature inside the cylinder during the power stroke of a four-stroke marine diesel engine?

B) It remains constant

A) It decreases significantly

D) It starts high and decreases as the piston moves downward

C) It increases slightly

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8. Fuel Systems

Question: Which of the following is a common cause of fuel injection pump failure in marine diesel engines?

C) Insufficient air intake

B) Contaminated fuel

A) High exhaust back pressure

D) Excessive lubricating oil

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