Q10 The impeller of a centrifugal pump has an outer diameter of (35.5 cm) and runs at (1000 rpm). The blade are making (150°) to the direction of motion at discharge and the radial velocity of flow is constant through the impeller at (2.4 m/sec). The measured head across the pump is (21.7 m) and the frictional resistance of the impeller is estimated to be (2m). Find the manometric efficiency, the volute casing losses, and the fraction of the kinetic energy of the water leaving the impeller which is converted to a pressure head in the casing. (79.35%, 3.64 m, 66.6%)

Q10 The impeller of a centrifugal pump has an outer diameter of (35.5 cm) and runs at (1000 rpm). The blade are making (150°) to the direction of motion at discharge and the radial velocity of flow is constant through the impeller at (2.4 m/sec). The measured head across the pump is (21.7 m) and the frictional resistance of the impeller is estimated to be (2m). Find the manometric efficiency, the volute casing losses, and the fraction of the kinetic energy of the water leaving the impeller which is converted to a pressure head in the casing. (79.35%, 3.64 m, 66.6%)

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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QIO The impeller of a centrifugal pump has an outer diameter of (35.5 cm) and runs
at (1000 rpm). The blade are making (150°) to the direction of motion at discharge
and the radial velocity of flow is constant through the impeller at (2.4 m/sec). The
measured head across the pump is (21.7 m) and the frictional resistance of the
impeller is estimated to be (2m). Find the manometric efficiency, the volute casing
losses, and the fraction of the kinetic energy of the water leaving the impeller which
is converted to a pressure head in the casing.
(79.35%, 3.64 m, 66.6%)
Q11 A multi-stage centrifugal pump is required to lift (8000 l/sec) of water against a
total (effective) head of (512 m). The speed of the pump is (3000 rpm) and the
specific speed is (50). Find the least number of stages required.
If the whole assembly is replaced by another unit consisting of ten-stages and
running at the same speed, find the specific speed if the new pump. (9 stage, 57.22)

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