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Which among the following happens at the first half of NPSH?

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in Fluid Mechanics by (118k points)
Which among the following happens at the first half of NPSH?

(a) Vapour pressure

(b) Atmospheric pressure

(c) Suction pressure

(d) Discharge pressure

I had been asked this question in a job interview.

This intriguing question comes from Effect of Acceleration in  Suction and Delivery Pipes on Indicator Diagrams in chapter Indicator Diagrams of Fluid Mechanics

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Correct answer is (c) Suction pressure

Easiest explanation: During the first half of the NPSH, the suction of air takes place. For the suction of an air, a strong suction pressure is required. Sometimes, the elevation of gauge must also be added. But, most of the times it is considered negligible.

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