Engineering Sciences
2017 · Paper 1
Take it one question at a time. Try an answer, then check your understanding.
Complete GATE XE 2017 Paper 1 overview, original pages and practice · Timed previous-paper practice
Questions 94–96 of 175. Imported answers require review unless explicitly marked reviewed.
Question 94
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An ideal gas having a mass of 0.5 kg is initially at 300 kPa, 80°C and occupies a volume of 0.14 m³. The gas undergoes an adiabatic process, where 50 kJ of work is transferred to the gas. The pressure and volume at the final state are 300 kPa and 0.20 m³. The change in the entropy of the gas in J/K is
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The van der Waals equation of state is given as,
where p in bar, v in m³/kmol and T is in K.
For air, the constants, a and b, are 1.368 bar.(m³/kmol)² and 0.0367 m³/kmol, respectively. Air is contained in a system at 160 K and 0.08 m³/kmol. If p₁ is the pressure calculated using ideal gas equation of state and p₂ is pressure calculated using van der Waals equation of state, then p₁/p₂ is equal to
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 96
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The values of specific volume of H₂O at 100°C for saturated liquid and saturated vapor states are 0.00104 m³/kg and 1.673 m³/kg, respectively. The slope of saturation pressure versus temperature curve, i.e.,
is 3570 Pa/K. The change in enthalpy in kJ/kg between the two saturation states is _________.Log in to check the answer
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