Allied & ICAR Exam Bank • ALLIED_1209 NAT • 2 Marks

Section 5: Irrigation and Drainage Engineering

Centrifugal Pumps and Cavitation

Subtopic: NPSH Available

Question Statement:

A centrifugal irrigation pump is installed at an elevation where atmospheric pressure head is $H_{atm} = 10.1\text{ m}$. Water vapor pressure head is $H_{vap} = 0.3\text{ m}$. The suction lift is $h_s = 3.5\text{ m}$ and friction head loss in the suction pipe is $h_{fs} = 0.8\text{ m}$. The Net Positive Suction Head Available ($NPSH_A = H_{atm} - H_{vap} - h_s - h_{fs}$) in meters is:

Answer Key:

5.5

Step-by-Step Solution & Explanation

$NPSH_A = 10.1 - 0.3 - 3.5 - 0.8 = 9.8 - 4.3 = 5.5\text{ m}$.
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