MDE 1 Q1 Intake stroke

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3. Piston Movement in Intake Stroke

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

A) Upward toward the cylinder head

D) Moves sideways within the cylinder

B) Downward away from the cylinder head

C) Remains stationary

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2. Valve Operation During Intake Stroke

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

B) Intake valve

D) Neither intake nor exhaust valve

C) Both intake and exhaust valves

A) Exhaust valve

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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

B) It decreases slightly

C) It remains constant

D) It becomes higher than the atmospheric pressure

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4. Air-Fuel Mixture in Intake Stroke

Question: What is drawn into the cylinder during the intake stroke in a marine diesel engine?

A) A mixture of air and fuel

B) Pure fuel

D) Exhaust gases

C) Pure air

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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?

C) To draw fresh air into the cylinder

A) To compress the air-fuel mixture

B) To ignite the air-fuel mixture

D) To expel exhaust gases from the cylinder

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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?

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

C) Both engines intake an air-fuel mixture

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

D) Both engines intake pure air

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5. Timing of the Intake Stroke

Question: When does the intake stroke begin in the four-stroke cycle of a marine diesel engine?

A) Immediately after the compression stroke

C) Immediately after the exhaust stroke

D) Immediately after the intake valve closes

B) Immediately after the power stroke

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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?

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

D) It determines the engine’s fuel efficiency

A) It initiates the ignition process

C) It controls the engine speed

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