MDE 2 Q2

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4. Inspection for Chain Slippage

Question: How does checking for chain slippage contribute to the maintenance of a chain-driven camshaft system?

A) It helps identify excessive fuel consumption

B) It ensures the engine is running at the correct temperature

C) It detects if the chain has skipped teeth, affecting engine timing

D) It confirms the cleanliness of the engine components

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2. Chain Wear Examination

Question: What is the purpose of examining the wear of a chain in a chain-driven camshaft system?

B) To assess the overall color of the chain

A) To check for signs of overheating

C) To determine if the chain has stretched or elongated, affecting timing

D) To inspect the chain for corrosion

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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

B) The color of the lubricant used

A) The amount of chain lubrication and its distribution

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?

C) It increases the mechanical friction in the engine

D) It reduces the power needed for engine accessories

A) It directly improves the fuel atomization process

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

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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?

A) It improves fuel efficiency by reducing friction

C) It increases the engine's horsepower output

D) It enhances the performance of the turbocharger

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

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3. Impact of Incomplete Combustion on Efficiency

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

A) It increases the overall engine temperature

D) It enhances the power output of the engine

C) It improves fuel economy by reducing fuel consumption

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

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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

C) By increasing the engine's operating temperature

D) By adding extra lubrication to the timing components

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

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6. Influence of Turbocharger on Efficiency

Question: How does a turbocharger impact the thermal and mechanical efficiency of a diesel engine?

B) It increases the engine’s intake air pressure, leading to improved combustion efficiency and power output

D) It primarily affects the lubrication system

A) It reduces the engine’s overall power output

C) It decreases engine noise and vibrations

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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?

A) To ensure the chain is properly lubricated

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

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

D) To confirm the chain’s color and condition

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1. Sources of Thermal Efficiency Losses

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

C) In the cooling system and lubrication system

A) In the fuel injection system and turbocharger

D) In the electrical system and battery

B) In the combustion chamber and exhaust system

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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?

D) To inspect the gear for signs of rust

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

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

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2. Mechanical Efficiency Losses

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

C) In the exhaust gas temperature and turbocharger performance

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

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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?

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

A) To ensure the engine’s visual appearance

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4. Effects of Engine Friction on Mechanical Efficiency

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

C) It reduces fuel consumption

D) It improves the performance of the turbocharger

A) It increases the engine’s thermal efficiency

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

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