Allied & ICAR Exam Bank • ALLIED_1144 MCQ • 1 Mark

Section 3: Farm Power

Farm Power

Subtopic: Engine Valves

Question Statement:

Valve overlap in an internal combustion engine refers to the period of crankshaft rotation during which:

Options:

  • (A) Both intake and exhaust valves remain open simultaneously near Top Dead Center (TDC)
  • (B) Both intake and exhaust valves are fully closed
  • (C) The spark plug fires twice per cycle
  • (D) The fuel injector and intake valve operate together

Answer Key:

A

Step-by-Step Solution & Explanation

Valve overlap occurs around end of exhaust stroke and beginning of intake stroke, where exhaust scavenging momentum aids in inducting fresh air charge into the combustion chamber.
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