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?

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

C) Enhanced fuel injection timing and reduced engine noise

D) Increased power output and better acceleration

A) Improved valve sealing and increased engine efficiency

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

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

A) To improve fuel atomization and reduce exhaust emissions

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

A) Increased engine power and improved fuel efficiency

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

D) Quieter engine operation and reduced oil consumption

C) Enhanced cooling of the engine and reduced exhaust emissions

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