Subtopic: Thermodynamic principles of I.C. engines
Question Statement:
The pump used in high pressure orchard sprayer is
Options:
(A) Centrifugal pump
(B) Rotary pump
(C) Plunger type positive displacement pump
(D) Turbine pump
Official Answer Key:
C
Step-by-Step Solution & Explanation
• Orchard sprayers must deliver a fine, high-velocity spray to reach tall canopies, which requires high discharge pressure (commonly 20–40 kg/cm² or more).
• Centrifugal, rotary and turbine pumps are low-to-medium pressure, high-volume devices — pressure output is limited by impeller tip speed and cannot economically reach the high pressures orchard sprayers need.
• A plunger-type (piston) positive-displacement pump generates high pressure nearly independent of flow rate, which is why it is the standard choice for high-pressure orchard/air-blast sprayers.
• Final Answer: (C) Plunger type positive displacement pump
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