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Which among the following parameter is low for CI engine comparatively to SI engine?

  • A.Noise
  • B.Cranking effort
  • C.Weight per unit power
  • D.Exhaust gas temperature

Answer: D

The parameter that is low for a CI engine compared with an SI engine is the exhaust gas temperature. A CI engine has a high expansion ratio and works with lean mixture, so the gases leave at a lower temperature. A CI engine has more noise, needs more cranking effort because of the high compression ratio, and is heavier per unit of power, so the other three parameters are higher.

The exhaust is cooler because the gases expand through a higher ratio, so more of their heat has been turned into work before they leave.

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