MDE 2 End of Unit Quiz

MDE 2 End Of Unit Quiz

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3. Impact of Incomplete Combustion on Efficiency

Question: How does incomplete combustion affect the thermal efficiency of a diesel engine?

C) It improves fuel economy by reducing fuel consumption

D) It enhances the power output of the engine

B) It results in a loss of energy and increases exhaust gas temperature

A) It increases the overall engine temperature

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4. Effects of Engine Friction on Mechanical Efficiency

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

A) It increases the engine’s thermal efficiency

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

C) It reduces fuel consumption

D) It improves the performance of the turbocharger

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3. Alignment of the Camshaft and Crankshaft

Question: Why is it important to check the alignment of the camshaft and crankshaft during a drive inspection?

A) To ensure the engine’s visual appearance

B) To confirm the alignment of the engine's accessories

C) To ensure proper timing and efficient engine operation

D) To verify the lubrication system’s effectiveness

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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?

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

A) To ensure the chain is properly lubricated

D) To confirm the chain’s color and condition

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

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5. Timing Chain Tensioner Function

Question: What is the role of the timing chain tensioner in the timing chain system?

B) To maintain the correct tension in the timing chain

D) To adjust the engine’s idle speed

A) To regulate the engine’s fuel intake

C) To enhance the engine’s power output

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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

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

D) In the lubrication system and fuel quality

C) In the exhaust gas temperature and turbocharger performance

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Types of Piston Ring Ends

Question: Which of the following are THREE different types of piston ring ends used in marine diesel engines?

A) Butt, tapered, and bevel

D) Straight, stepped, and curved

B) Flat, rounded, and serrated

C) Notched, grooved, and slotted

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Components of a Timing Chain Link

Question: What components are typically found in a timing chain link?

C) Pulleys, belts, and idlers

B) Gears, sprockets, and tensioners

A) Chain links, rollers, and side plates

D) Camshafts, crankshafts, and valves

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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

D) It reduces the power needed for engine accessories

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

A) It directly improves the fuel atomization process

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Desirable Properties of Piston Rings

Question: Which of the following are THREE desirable properties of piston rings in a marine diesel engine?

B) Low density, high expansion, and flexibility

A) High thermal conductivity, low wear rate, and effective sealing

C) High lubricity, low cost, and ease of replacement

D) High corrosion resistance, low thermal expansion, and high compressibility

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Correcting Slight Loss of Timing Drive Tension

Question: How can slight loss of tension in engine timing belts or chains be corrected?

B) By adjusting the tensioner or idler pulleys to restore proper tension

D) By adding extra lubrication to the timing components

C) By increasing the engine's operating temperature

A) By replacing the timing belt or chain with a new one

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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?

D) To transmit rotational motion between the sprockets

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

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