MDE 3 Q6

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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

C) Enhanced fuel injection timing and reduced engine noise

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

D) Increased power output and better acceleration

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

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

C) Enhanced cooling of the engine and reduced exhaust emissions

D) Quieter engine operation and reduced oil consumption

A) Increased engine power and improved fuel efficiency

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Question: Why might double (nested) valve springs be fitted in a four-stroke diesel engine?

A) To improve fuel atomization and reduce exhaust emissions

B) To increase the engine's compression ratio and power output

D) To reduce the overall weight of the engine and improve fuel efficiency

C) To prevent valve float at high engine speeds and ensure consistent valve operation

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