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Question

What would happen if the intake valve in a diesel engine is too small?

This question was previously asked in
RRB NTPC 2025 Graduate Level CBT 1 Question Paper (25-Mar-2026) (Shift 3)
The correct answer is

Less air would enter the cylinder

The intake valve controls how much air can flow into the cylinder during the induction stroke, and its opening size limits that flow.

A smaller intake valve restricts the passage, so the volume of air that can enter the cylinder in the available time is reduced.

With less air drawn in, the cylinder is poorly filled, which lowers the oxygen available for combustion and hurts engine performance.

A small valve does not admit more fuel, raise exhaust, or cool the engine, so those effects do not follow.

Hence, the answer is Less air would enter the cylinder.

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