Allied & ICAR Exam Bank • ALLIED_1107 MCQ • 1 Mark

Section 3: Farm Power

Farm Power

Subtopic: Fuel Injection and Combustion

Question Statement:

In a Compression Ignition (CI) tractor engine, the delay period (ignition lag) is defined as the time interval between:

Options:

  • (A) Start of fuel injection and the start of actual combustion (pressure rise departure)
  • (B) Start of air induction and end of compression stroke
  • (C) Opening of intake valve and closing of exhaust valve
  • (D) Injection pump delivery and nozzle needle seating

Answer Key:

A

Step-by-Step Solution & Explanation

Ignition delay in diesel engines consists of physical delay (atomization, vaporization, mixing) and chemical delay (pre-flame chemical reactions) spanning start of injection to the point of perceptible pressure rise.
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