Allied & ICAR Exam Bank • ALLIED_0257 MCQ • 1 Mark

Section 3: Farm Power

Farm Power

Subtopic: I.C. engine cycles

Question Statement:

In a 4-stroke CI engine, valve overlap is the period when:

Options:

  • (A) Both intake and exhaust valves remain open simultaneously around top dead center between exhaust and intake strokes
  • (B) Both valves are fully closed during power stroke
  • (C) Fuel injector needle is open
  • (D) Piston is at BDC

Answer Key:

A

Step-by-Step Solution & Explanation

Valve overlap utilizes exhaust gas outgoing momentum to draw in fresh air charge and scavenge combustion chamber.
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