Engineering Sciences
GATE XE Properties of Pure Substances PYQs
Build your understanding with focused practice from past exam papers.
Questions 31–40 of 44. Imported answers require independent review unless marked reviewed.
Question 12
Open questionXE-EMCQ2 marksNeeds review
A 4-m
reservoir contains 10 kg of a real gas at 200 K. If this gas follows the van der Waal’s equation of state with
m
.kPa/kg
,
m
/kg and
kJ/kg.K, then the reservoir pressure (in kPa) isYour answerChoose one option.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 3
Open questionXE-EMCQ1 markNeeds review
A thermodynamic process for a substance is represented as a constant pressure process on a
-
diagram, and a constant temperature process on a
-
diagram. Which of the following statements is TRUE?Your answerChoose one option.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 6
Open questionXE-EMCQ1 markNeeds review
The “degrees of freedom” for a pure substance at its triple point is
Your answerChoose one option.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 9
Open questionXE-ENAT1 markNeeds review
A closed vessel contains a pure substance with 0.1 m
of saturated liquid and 0.9 m
of saturated vapor. The specific volume of the liquid and vapor phases are 0.00843 m
/kg and 0.02671 m
/kg respectively. The percentage of vapor in the mixture on mass basis (rounded off to two decimal places) is ________.Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 10
Open questionXE-EMCQ2 marksNeeds review
A gas obeys the van der Waals equation of state
, where
and
are van der Waals constants. The compressibility factor
in the limit of high specific volume (
) isYour answerChoose one option.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 22
Open questionXE-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 |
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 5
Open questionXE-EMCQ1 markNeeds review
The value of the compressibility factor at the critical point evaluated using the van der Waals equation of state is
Your answerChoose one option.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 6
Open questionXE-EMCQ1 markNeeds review
The vapour pressure of a liquid at 8 °C is 2.7 kPa. Its enthalpy of vaporization is constant and equal to 4700 kJ/kmol. Take R = 8.314 kJ/kmol.K. The temperature (in °C) at a vapour pressure of 13.5 kPa is
Your answerChoose one option.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 9
Open questionXE-ENAT1 markNeeds review
An ideal gas has a molar mass of 40 kg/kmol. Take R = 8.314 kJ/kmol.K. At a pressure of 2 bar and a temperature of 300 K, the volume (in m
) of 1 kg of this gas (up to 2 decimal places) is ________.Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 15
Open questionXE-EMCQ2 marksNeeds review
Methane has compressibility factor value of 0.9 at reduced pressure of 1.0 and reduced temperature of 1.5. For propane, the critical temperature and pressure are 369.8 K and 42.48 bar, respectively. Take R = 8.314 kJ/kmol.K. Applying the principle of corresponding states, the molar volume of propane (in m
/kmol) at the same reduced pressure and temperature isYour answerChoose one option.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer