Given below are two statements Statement... | Irrigation & Drainage Engineering

ICAR JRF Irrigation And Drainage Engineering 29 Jun 2024Shift 1

Statement Based +4 −1

Given below are two statements

Statement (I) : The top of the piston heats much more than does the lower skirt

Statement (II) : The pistons are made larger at the top to absorb excessive heat released during compression stroke, and are said to have skirt taper.

In light of the above statements, choose the most appropriate answer from the options given below.

Both Statement (I) and Statement (II) are correct Both Statement (|) and Statement (II) are incorrect Statement (I) is correct but Statement (II) is incorrect. Correct Statement (I) is incorrect but Statement (II) is correct.

Internal Combustion Engine Piston Thermal Expansion:
Statement (I): The top of the piston heats much more than does the lower skirt. $\implies$ Correct.
The piston crown/top directly absorbs combustion flame temperatures exceeding 1500°C–2000°C, operating at 250°C–300°C, while the lower skirt remains much cooler (100°C–120°C).
Statement (II): The pistons are made larger at the top to absorb excessive heat released during compression stroke, and are said to have skirt taper. $\implies$ Incorrect.
Because the piston crown expands significantly more than the skirt, cold pistons are manufactured smaller at the top (tapered) so that at operating temperatures, thermal expansion brings the piston to a uniform cylindrical shape.
Conclusion: Statement (I) is correct but Statement (II) is incorrect (Option 3).

Explanation not matching this question? क्या व्याख्या इस प्रश्न से मेल नहीं खा रही? Report

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