Question:

Which of the following components is/are NOT found in a two-stroke marine diesel engine?

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In two-stroke marine diesel engines, combustion occurs via compression, eliminating the need for spark plugs. Air-inlet valves are also absent because diesel engines use scavenging to intake air.
Updated On: Apr 25, 2025
  • Crankshaft
  • Piston
  • Spark plug
  • Air-inlet valve
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The Correct Option is C, D

Solution and Explanation

In a two-stroke marine diesel engine, the process of combustion occurs through compression, which is a key feature of diesel engines. Unlike gasoline engines, diesel engines do not use spark plugs because they rely on compression ignition. Let's break down each component in relation to a two-stroke diesel engine:

Components in a two-stroke engine:
Crankshaft: Present in two-stroke engines. It is used to convert the linear motion of the piston into rotary motion.
Piston: Present in two-stroke engines, where it moves up and down in the cylinder, compressing the air-fuel mixture.
Air-inlet valve: Not typically found in two-stroke marine diesel engines. Diesel engines rely on scavenging and do not require air-inlet valves.
Spark plug: Not used in diesel engines. Diesel engines rely on the high compression of the air-fuel mixture, causing it to ignite spontaneously without the need for a spark plug.

Conclusion: The spark plug and air-inlet valve are not typically present in two-stroke marine diesel engines.
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