Exam Question
Describe following terms with respect to Diesel Engine with suitable diagram:
(a) Natural Aspiration. (4)
(b) Scavenging. (4)
(c) Supercharging. (4)
(d) Types of Super charging in two stroke engine. (4)
Class 4 (4th Engineer)
MEKM
📅 Mar 2026
Reference Answer
### (a) Natural Aspiration
**Concept:**
Natural Aspiration is an engine air induction method where the intake of air into the cylinders is solely dependent on the atmospheric pressure. The process relies on the pressure differential created when the piston moves downwards during the intake stroke, creating a partial vacuum within the cylinder. This pressure difference (P_atmospheric > P_cylinder) forces air to flow into the combustion space.
**Mechanism (in a 4-Stroke Cycle):**
**Concept:**
Natural Aspiration is an engine air induction method where the intake of air into the cylinders is solely dependent on the atmospheric pressure. The process relies on the pressure differential created when the piston moves downwards during the intake stroke, creating a partial vacuum within the cylinder. This pressure difference (P_atmospheric > P_cylinder) forces air to flow into the combustion space.
**Mechanism (in a 4-Stroke Cycle):**
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