MDE 3 End of Unit Quiz

MDE 3 End Of Unit Quiz

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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?

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

A) It helps identify excessive fuel consumption

D) It confirms the cleanliness of the engine components

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

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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

A) To ensure the chain is properly lubricated

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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6. Timing Chain Guide Purpose

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

A) To control the flow of coolant to the engine

D) To monitor the engine’s fuel consumption

C) To regulate the engine’s exhaust emissions

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

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Meaning and Purpose of Valve Overlap

Question: What does the term "valve overlap" refer to, and what is its purpose in an engine?

B) Valve overlap refers to the period when both the intake and exhaust valves are open simultaneously. Its purpose is to enhance the engine’s performance by improving the scavenging of exhaust gases and increasing the intake of fresh air.

C) Valve overlap refers to the period when the intake valve opens before the exhaust valve closes. Its purpose is to reduce engine noise and vibration.

A) Valve overlap refers to the period when both the intake and exhaust valves are closed to maximize compression. Its purpose is to prevent exhaust gases from entering the intake manifold.

D) Valve overlap refers to the time when only the exhaust valve is open. Its purpose is to decrease the engine's fuel consumption.

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Four-Stroke Timing Diagram

Question: What does a four-stroke timing diagram illustrate?

A) The sequence of fuel injection and ignition events

B) The synchronization of valve openings and closings with the piston positions during the four-stroke cycle

D) The temperature variations of the engine during operation

C) The fuel consumption rate at different engine speeds

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Effects of Too Large Tappet Clearance

Question: What are the effects of having too large a tappet clearance on the exhaust valves of a four-stroke diesel engine?

D) Quieter engine operation and reduced oil consumption

C) Enhanced cooling of the engine and reduced exhaust emissions

B) Poor engine performance, increased valve train wear, and potential for valve damage

A) Increased engine power and improved fuel efficiency

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6. Timing of Valve Openings and Closings

Question: How is the timing of the valve openings and closings shown in a four-stroke timing diagram?

D) As a sequence of numbers representing engine RPM

B) As overlapping lines representing the duration each valve is open or closed relative to the piston position

C) As numerical values indicating the temperature of the exhaust gases

A) As a series of graphs showing fuel consumption rates

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2. Role of Rollers in a Timing Chain

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

A) They enhance the lubrication of the timing chain

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

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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?

D) To inspect the chain for corrosion

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

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4. Valve Operation during the Exhaust Stroke

Question: What is the position of the valves during the exhaust stroke in a four-stroke engine timing diagram?

B) The intake valve remains closed, and the exhaust valve opens

C) Both the intake and exhaust valves are open

D) Both the intake and exhaust valves are closed

A) The intake valve opens, and the exhaust valve closes

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Effects of Too Small Tappet Clearance

Question: What are the effects of having too small a tappet clearance on the exhaust valves of a four-stroke diesel engine?

A) Improved valve sealing and increased engine efficiency

B) Overheating of the valves, potential for incomplete valve closure, and increased wear on the valve train

D) Increased power output and better acceleration

C) Enhanced fuel injection timing and reduced engine noise

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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?

C) By increasing the engine's operating temperature

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

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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