Question Bank • QB_FP_ADV_021 MCQ • 1 Mark

Section 3: Farm Power

Farm Power

Subtopic: Engine components

Question Statement:

In a tractor diesel engine piston assembly, the bottom-most ring located below the compression rings on the piston skirt is the:

Options:

  • (A) Scraper / oil control ring
  • (B) Top fire ring
  • (C) Taper-faced compression ring
  • (D) Torsional twist ring

Answer Key:

A

Step-by-Step Solution & Explanation

- **Piston Ring Configuration:** - Top rings: Compression rings (maintain gas-tight seal against blow-by of combustion gases into crankcase). - Bottom ring: Oil control (scraper) ring with slotted drainage ports that scrapes excess lubricating oil from the cylinder wall on downstrokes and returns it to the crankcase sump.
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