GATE Mechanical Engineering (ME) 2020 Shift 1 Solved Paper

Question : 45 of 65

Marks: +1, -0

For an ideal Rankine cycle operating between pressures of 30 bar and

0.04

bar, the work output from the turbine is

903 {kJ} {\/} {kg}

and the work input to the feed pump is

3 {kJ} {/} {kg}

. The specific steam consumption is _____________ kg/kW.h (round off to 2 decimal places).

Solution:

specific steam consumption (ssc)

=\;{3600}/{W_{\;\text "net "\;}}

Net work

( {W}_{\text "net "})=

Turbine work - Pump work

=903-3=900 {KJ} {/} {Kg}

specific steam consumption

=\;{3600}/{W_{\text "net "\;}}

=\;{3600}/{900}

=4 {Kg} {/} {Kwh}

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