SSC JE Mechanical Engineering 2018 Set 3 Paper

Question : 147 of 200

Marks: +1, -0

What is the velocity of steam (in m/sec) at exit across a steam whistle which is perfectly insulated and does not perform any work and undergoes a drop of 0.2 kJ/kg in enthalpy from entry to exit?

Validate

Solution:

Given drop in enthalpy

h_1 -h_2 = 0.2

KJ/kg
From S.F.E.E. (Steady flow energy equation in case of nozzel

h_1+v_1^2/2=h_2+v_2^2/2

inlet velocity

v_1

= 0 (neglect)

2(h_1-h_2)=v_2^2

v_2=√{2((h_1-h_2)}

=√{2(0.2×10^3)}=20

m / s

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