Engineering Sciences
2025 · Paper 1
Take it one question at a time. Try an answer, then check your understanding.
Complete GATE XE 2025 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
Open questionXE-ENAT1 markNeeds review
A tank of 4 m
contains an ideal gas mixture of 60% hydrogen and 40% nitrogen by volume at 100 kPa and 300 K. Nitrogen is added to the tank such that the composition changes to 50% nitrogen by volume, with a final temperature of 300 K. The amount of nitrogen (in kmol) to be added is __________ (rounded off to three decimal places).Use: Universal gas constant (Rᵤ) = 8.314 kJ/kmol-K
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Open questionXE-ENAT1 markNeeds review
A heat engine having thermal efficiency of 40% receives heat from a source at 600 K and rejects heat to a sink at 300 K. The second-law efficiency (in %) of this engine is __________ (answer in integer).
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Open questionXE-ENAT1 markNeeds review
A rigid tank of 300 litre capacity contains 3 kg of oxygen (molar mass = 32 kg/kmol) at 25 °C. If oxygen behaves as an ideal gas, the pressure (in kPa) inside the tank is __________ (rounded off to two decimal places).
Use: Universal gas constant (Rᵤ) = 8.314 kJ/kmol-K
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