Engineering Sciences
2025 · Paper 1
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Complete GATE XE 2025 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 103
Open questionXE-ENAT2 marksNeeds review
A stream of superheated steam (2 MPa, 300 °C) mixes with another stream of superheated steam (2 MPa, 400 °C) through a steady-state adiabatic process. The flow rates of the streams are 3 kg/min and 2 kg/min, respectively. This mixture then expands in an adiabatic nozzle to a saturated mixture with a quality of 0.77 and 1 kPa. Neglect the velocity at the nozzle entrance and the change in potential energies. The velocity at the nozzle exit (in m/s) is __________ (rounded off to two decimal places).
Use the following data:
At 2 MPa, 300 °C: Specific enthalpy of superheated steam = 3024.2 kJ/kg
At 2 MPa, 400 °C: Specific enthalpy of superheated steam = 3248.4 kJ/kg
At 1 kPa: Specific enthalpy of saturated water = 29.3 kJ/kg
At 1 kPa: Specific enthalpy of saturated vapour = 2513.7 kJ/kg
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Open questionXE-ENAT2 marksNeeds review
A piston-cylinder assembly having 250 mm diameter contains 0.01 kg of water vapor at 1 MPa and 200 °C. The specific volume of the vapor is 0.20602 m
/kg. The system expands as per the relation
= constant, where p is pressure and V is volume. If the final pressure is 0.35 MPa, the value of the exponent (n) is __________ (rounded off to two decimal places).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 105
Open questionXE-ENAT2 marksNeeds review
Air enters a air dryer at 22 °C and 100 kPa with a velocity of 3.7 m/s, and leaves the dryer at 83 °C and 100 kPa with a velocity of 9.1 m/s. The exit area of the dryer is 18.7 cm
, and the ambient temperature is 22 °C. The air is an ideal gas with gas constant
= 0.287 kJ/kg-K and isobaric specific heat
= 1.005 kJ/kg-K. If the change in potential energy is neglected, the second law efficiency (in %) of the dryer is __________ (rounded off to one decimal place).Log in to check the answer
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