MDE 2 End of Unit Quiz

MDE 2 End Of Unit Quiz

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6. Camshaft Gear Teeth Condition

Question: During a drive inspection, why should the condition of the camshaft gear teeth be examined?

A) To check for cracks or damage that might affect the gear's engagement with the chain

B) To verify the gear's color consistency

C) To ensure the gear matches the engine’s original specifications

D) To inspect the gear for signs of rust

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5. Role of the Cooling System in Efficiency

Question: How does the cooling system impact the thermal efficiency of a diesel engine?

C) It increases the mechanical friction in the engine

B) It prevents overheating, which helps maintain optimal combustion temperatures and efficiency

D) It reduces the power needed for engine accessories

A) It directly improves the fuel atomization process

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Effects of Loss of Timing Drive Tension

Question: How does a loss of tension in engine timing belts or chains affect the engine?

B) It can lead to incorrect valve timing, causing engine misfires and potential damage

D) It enhances the performance of the turbocharger

A) It improves fuel efficiency by reducing friction

C) It increases the engine's horsepower output

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Materials Used for Piston Rings

Question: Which of the following materials are commonly used for manufacturing piston rings in marine diesel engines?

A) Cast iron, chrome-plated steel, and high-carbon steel

B) Aluminum alloy, copper, and plastic

D) Magnesium alloy, lead, and graphite

C) Stainless steel, bronze, and titanium

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1. Chain Tension Check

Question: During a drive inspection of a chain-driven camshaft, why is it important to check the chain tension?

D) To confirm the chain’s color and condition

B) To verify that the chain is aligned with the crankshaft

C) To prevent excessive wear and noise, and to ensure proper timing

A) To ensure the chain is properly lubricated

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Importance of Clearances for Piston Rings

Question: Why are the clearances necessary for efficient piston ring functioning in a marine diesel engine?

B) To increase the friction between the piston rings and the cylinder wall

D) To reduce the overall size and weight of the engine components

C) To enhance the cooling of the engine

A) To allow for thermal expansion, prevent binding, and ensure smooth operation

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1. Function of Timing Chain Links

Question: What is the primary function of the chain links in a timing chain system?

B) To adjust the timing of the engine

C) To maintain the proper tension in the timing belt

A) To connect the camshaft to the crankshaft

D) To transmit rotational motion between the sprockets

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Clearances for Efficient Piston Ring Functioning

Question: Which of the following THREE clearances are necessary for efficient piston ring functioning in a marine diesel engine?

A) End clearance, radial clearance, and side clearance

B) Compression clearance, thermal clearance, and axial clearance

D) End clearance, side clearance, and oil clearance

C) Radial clearance, axial clearance, and lateral clearance

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4. Effects of Engine Friction on Mechanical Efficiency

Question: What effect does engine friction have on mechanical efficiency?

D) It improves the performance of the turbocharger

B) It decreases the engine’s power output and mechanical efficiency

A) It increases the engine’s thermal efficiency

C) It reduces fuel consumption

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4. Purpose of Timing Chain Sprockets

Question: What is the purpose of the sprockets in a timing chain system?

A) To provide additional tension to the timing chain

B) To guide and drive the timing chain, synchronizing engine components

D) To filter impurities from the engine oil

C) To cool the engine during operation

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Piston Ring End Clearance

Question: Why is piston ring end clearance necessary in a marine diesel engine?

D) To reduce the piston ring's contact area with the cylinder wall

C) To enhance the lubrication of the piston rings

A) To allow for thermal expansion and prevent the rings from binding in the cylinder

B) To increase the friction between the piston rings and the cylinder wall

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2. Mechanical Efficiency Losses

Question: What are common sources of mechanical efficiency losses in a diesel engine?

B) In the friction between engine components and parasitic losses from accessories

D) In the lubrication system and fuel quality

A) In the fuel injection timing and air-fuel ratio

C) In the exhaust gas temperature and turbocharger performance

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