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?

A) Piston crown, piston rings, and piston skirt

C) Fuel injector, turbocharger, and intake valve

B) Camshaft, crankshaft, and connecting rod

D) Exhaust valve, rocker arm, and valve spring

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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?

A) To expel exhaust gases from the cylinder

C) To compress the air in the cylinder

B) To ignite the air-fuel mixture

D) To draw fresh air into the cylinder

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9. Scavenge Systems

Question: What is the purpose of the scavenging system in a two-stroke marine diesel engine?

A) To increase fuel injection pressure

B) To remove exhaust gases and fill the cylinder with fresh air

D) To lubricate the piston rings

C) To cool the cylinder head

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8. Common Issues During Compression Stroke

Question: What could be a possible cause of reduced compression in a marine diesel engine?

A) Faulty fuel injectors

B) Clogged air filters

D) Low coolant level

C) Worn piston rings or cylinder liner

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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

C) Fuel viscosity and piston speed

D) Combustion chamber design and exhaust temperature

B) Engine speed and air-fuel ratio

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2. Valve Operation During Exhaust Stroke

Question: During the exhaust stroke of a four-stroke marine diesel engine, which valve is open?

C) Both intake and exhaust valves

A) Intake valve

D) Neither valve

B) Exhaust valve

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6. Compression Ratio in Diesel Engines

Question: Why is the compression ratio typically higher in diesel engines compared to gasoline engines?

D) To reduce engine noise

C) To ensure the air is hot enough to ignite the fuel

B) To improve fuel atomization

A) To increase engine speed

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7. Engine Governors

Question: What is the primary function of the governor in a marine diesel engine?

B) To control the engine’s speed

C) To increase fuel efficiency

A) To adjust the engine’s fuel-to-air ratio

D) To reduce engine noise

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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

B) To ignite the air-fuel mixture

C) To draw fresh air into the cylinder

D) To expel exhaust gases from the cylinder

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4. Effect on Air Temperature During Compression Stroke

Question: What happens to the temperature of the air inside the cylinder during the compression stroke in a marine diesel engine?

D) It fluctuates

A) It decreases

B) It remains the same

C) It increases

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2. Piston Movement During Power Stroke

Question: In which direction does the piston move during the power stroke of a four-stroke marine diesel engine?

C) Remains stationary

D) Moves sideways within the cylinder

A) Upward toward the cylinder head

B) Downward away from the cylinder head

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8. Exhaust System in Diesel Engines

Question: What is the role of the exhaust system connected to the cylinder during the exhaust stroke?

B) It filters the air entering the cylinder

D) It injects fuel into the cylinder

C) It channels the exhaust gases out of the engine

A) It cools down the intake air

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