SSC JE Mechanical Engineering 27 Oct 2020 Shift 2 Papers

Question : 186 of 200

Marks: +1, -0

The ratio of clearance volume to the displacement volume of an R12 reciprocating compressor is 0.06. specific volume an inlet and outlet compressors are 0.03 and 0.01 m

^3

/kg respectively. Volumetric efficiency of the compressor is:

82%
95%
76.4%
88%

Validate

Solution:

Given:

{C}=0.06, {v}_{1}=0.03 {m}^{3} \/ {kg}, {v}_{2}=0.01 {m}^{3} \/ {kg}

\η_{{V}}=1+{C}-{C}({{p}_{2}}/{{p}_{1}})

=1+{C}-{C} {{v}_{1}}/{{v}_{2}}

=1+0.06-0.06 \×{0.03}/{0.01}

\η_{{V}}=0.88

\∴\η_{{v}}=0.88

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