SSC JE Mechanical Engineering 2017 Set 2 Paper

Question : 136 of 200

Marks: +1, -0

Medium specific speed of a pump implies that it is _______.

Solution:

● The specific speed for the pump is calculated from the following for the given values

n_s={n√Q}/{H^{3/4}}

={1450√0.0833}/50^{3\/4} =22.3

● After finding the specific speed the shape of the impeller can be decided using the following table.

\table \text"Shape No. Range" ,\text"Shape of the Impeller";10 < n_s < 50 ,\text"Radial Type";50 < n_s < 150 ,\text"Mixed Type";150 < n_s < 400 ,\text"Axial Type"

The specific speed is in the radial type pump range

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