Allied & ICAR Exam Bank • ALLIED_0845
MCQ • 1 Mark
Section 3: Farm Power
Farm Power
Subtopic: I.C. engine systems – fuel, cooling, lubrication, ignition, electrical, intake and exhaust
Question Statement:
Diesel knock differs fundamentally from petrol engine knock because diesel knock occurs:
Options:
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(A) At the beginning of combustion due to excessive fuel accumulation during a prolonged ignition delay period
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(B) At the end of combustion due to auto-ignition of the unburned end-gas
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(C) Due to pre-ignition from hot spark plugs
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(D) Only during engine deceleration
Step-by-Step Solution & Explanation
In diesel engines, a long delay allows large fuel mass to vaporize and ignite simultaneously, causing sudden violent pressure rise at ignition onset.
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