Allied & ICAR Exam Bank • ALLIED_0843 MCQ • 1 Mark

Section 3: Farm Power

Farm Power

Subtopic: I.C. engine systems – fuel, cooling, lubrication, ignition, electrical, intake and exhaust

Question Statement:

The ignition delay period (ignition lag) in a diesel engine consists of two distinct phases:

Options:

  • (A) Physical delay (fuel atomization, vaporization, and mixing) followed by chemical delay (pre-flame oxidation reactions)
  • (B) Mechanical delay and hydraulic delay
  • (C) Thermal expansion and electrical spark delay
  • (D) Compression delay and expansion delay

Answer Key:

A

Step-by-Step Solution & Explanation

Physical delay involves droplets breaking up and vaporizing; chemical delay involves free radical build-up leading to auto-ignition.
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