MDE 2 End of Unit Quiz

MDE 2 End Of Unit Quiz

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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

C) Notched, grooved, and slotted

D) Straight, stepped, and curved

B) Flat, rounded, and serrated

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6. Timing Chain Guide Purpose

Question: What is the purpose of the timing chain guide?

C) To regulate the engine’s exhaust emissions

D) To monitor the engine’s fuel consumption

B) To guide the timing chain and prevent it from deviating from its path

A) To control the flow of coolant to the engine

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Components of a Timing Chain Link

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

A) Chain links, rollers, and side plates

D) Camshafts, crankshafts, and valves

B) Gears, sprockets, and tensioners

C) Pulleys, belts, and idlers

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3. Function of Side Plates in a Timing Chain

Question: What is the function of the side plates in a timing chain?

B) To adjust the tension of the timing chain

D) To support the engine’s pistons

C) To lubricate the chain links

A) To keep the chain aligned and secure

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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

C) It increases the engine's horsepower output

A) It improves fuel efficiency by reducing friction

D) It enhances the performance of the turbocharger

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1. Sources of Thermal Efficiency Losses

Question: In a diesel engine, where may thermal efficiency losses commonly occur?

B) In the combustion chamber and exhaust system

D) In the electrical system and battery

C) In the cooling system and lubrication system

A) In the fuel injection system and turbocharger

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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

C) To enhance the engine’s power output

D) To adjust the engine’s idle speed

A) To regulate the engine’s fuel intake

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2. Role of Rollers in a Timing Chain

Question: What role do rollers play in a timing chain system?

C) They adjust the tension of the timing chain

B) They reduce friction and wear between the chain and sprockets

D) They support the camshaft alignment

A) They enhance the lubrication of the timing chain

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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

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

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

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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?

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

D) To confirm the chain’s color and condition

A) To ensure the chain is properly lubricated

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

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5. Chain Lubrication Inspection

Question: What should be checked regarding chain lubrication during a camshaft drive inspection?

C) The brand of the lubricant

A) The amount of chain lubrication and its distribution

B) The color of the lubricant used

D) The level of coolant in the engine

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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?

D) It reduces the power needed for engine accessories

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

C) It increases the mechanical friction in the engine

A) It directly improves the fuel atomization process

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