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Engineering Exams RRB-JE Civil and Allied Engineering Technical Abilities 2025 20.04.25 Paper-2 Shift-1 Medium +1 -0.33
What is the primary mechanism by which a hydraulic pump moves fluid?
Correct Answer: C. By creating a vacuum to draw fluid in and then pressurising it
Explanation: The correct answer is by creating a vacuum to draw fluid in and then pressurising it. Hydraulic pumps function by generating a vacuum at the pump inlet, which allows atmospheric pressure to force liquid from the reservoir into the pump's inlet line. Once inside, the mechanical action of the pump traps the fluid and delivers it to the outlet, forcing it into the hydraulic system under pressure. This process converts mechanical energy from a motor or engine into hydraulic energy, enabling the movement and control of fluid within the system.
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