GATE XE · 2019 · XE-E
Question 22: Second Law of Thermodynamics
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Question 22
XE-ENAT2 marksNeeds review
In a steady flow process, superheated steam at 70 bar and 450°C, is throttled to 30 bar in an insulated valve, at a rate of 2 kg/s. The changes in the kinetic energy and potential energy during the process are assumed to be zero. The rate of entropy generation (kJ/s.K rounded off to three decimal places) during the throttling process is _____________.
The thermodynamic property data for superheated steam at 70 bar and 450°C:
kJ/kg,
kJ/kg.K
The thermodynamic property data for superheated steam at 30 bar are given in the following table.T (°C) | h (kJ/kg) | s (kJ/kg.K) |
|---|---|---|
400 | 3231.7 | 6.9235 |
450 | 3344.9 | 7.0856 |
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2019XE-E
GATE XE 2019 · Paper 1
Engineering Sciences · Original paper archive
- Section
- Section XE-E
- Question type
- Numerical answer (NAT)
- Marks
- 2 marks
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