Engineering Sciences
2021 · Paper 1
Take it one question at a time. Try an answer, then check your understanding.
Complete GATE XE 2021 Paper 1 overview, original pages and practice · Timed previous-paper practice
Questions 103–105 of 175. Imported answers require review unless explicitly marked reviewed.
Question 16
Open questionXE-ENAT2 marksNeeds review
A mixture of air and water vapour enters a steady-flow adiabatic saturator at 50°C and 100 kPa. It leaves the saturator in a completely saturated state at temperature of 25°C and pressure of 100 kPa. Liquid water enters the saturator at 25°C. If air is considered to be an ideal gas, with constant specific heat capacity, the relative humidity of the air entering the saturator is __________ % (1 decimal place).
Use the following data:
at 25°C
kJ/kg,
kJ/kg,
kPaat 50°C
kJ/kg,
kJ/kg,
kPaSpecific heat capacity of air at constant pressure
kJ/(kgK)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 17
Open questionXE-ENAT2 marksNeeds review
Air at a pressure of 1 MPa and 300 K is flowing in a pipe. An insulated evacuated rigid tank is connected to this pipe through an insulated valve. The volume of the tank is 1 m³. The valve is opened and the tank is filled with air until the pressure in the tank is 1 MPa. Subsequently, the valve is closed. Consider air to be an ideal gas and neglect bulk kinetic and potential energy. The final temperature of air in the tank is __________ K (1 decimal place).
Specific heat capacity of air at constant pressure
kJ/(kgK) and characteristic gas constant for air = 0.287 kJ/(kgK)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 18
Open questionXE-ENAT2 marksNeeds review
A cylinder of volume 0.1 m³ is filled with 100 mol of propane (C₃H₈) at 2 MPa. If propane is assumed to obey the van der Waals equation of state, then its temperature is ______ K (1 decimal place).
The van der Waals constants for propane are: a = 939.2 kPa (m³/kmol)² and b = 0.095 m³/kmol. The universal gas constant is 8.3145 J/(mol K).
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