SSC JE Mechanical Engineering 27 Oct 2020 Shift 2 Papers

Question : 110 of 200

Marks: +1, -0

The internal and external diameter of the impeller of a centrifugal pump are 200 mm and 400 mm respectively. The pump is running at 1200 rpm. Find the velocity of flow if the vane angle at inlet 20°.
Given tan 20° = 0.363

7.42 m/s
3.34 m/s
4.57 m/s
6.67 m/s

Validate

Solution:

N = 1200 rpm, Inner Diameter = 200 mm = 0.2 m, Outer Diameter = 250 mm
Now,
Tangential velocity at inlet

u_{1}={\πD_{1} N}/{60}

={\π\×0.2 \×1200}/{60}=12.56 {m} \/ {s}

Now,

\∴

Vane angle at inlet

(\tan \θ)={{V}_{{f1}}}/{{u}_{1}}={{V}_{{f} 1}}/{10.47}

\∴\tan 20° \×12.56={V}_{{f} 1}

\∴{V}_{{f1}}=4.57 {m} \/ {s}

Go to Question:

Prev Question

Next Question