Allied & ICAR Exam Bank • ALLIED_0871
MCQ • 1 Mark
Section 3: Farm Power
Farm Power
Subtopic: I.C. engine systems – fuel, cooling, lubrication, ignition, electrical, intake and exhaust
Question Statement:
In a forced-feed engine lubrication system, the oil pressure relief valve prevents:
Options:
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(A) Excessive oil pressure spike during cold starts with high-viscosity oil that could rupture the oil filter or blow oil seals
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(B) Oil from entering the oil sump
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(C) Air from entering the intake manifold
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(D) Engine overheating
Step-by-Step Solution & Explanation
A spring-loaded ball or plunger relief valve diverts surplus high-pressure oil back to the sump when cold viscous oil threatens filter integrity.
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