GATE XE 2025 Paper 1 — page 34

Complete GATE XE 2025 Paper 1 overview, original pages and practice · Timed previous-paper practice

Questions 100–102 of 175. Imported answers require review unless explicitly marked reviewed.

Paper practice 175 questionsPage 34 of 59

A piston-cylinder arrangement contains an ideal gas mixture of 4 kg of hydrogen and 13 kg of nitrogen at 250 K and atmospheric pressure. On heat addition, the mixture expands at constant pressure until the temperature rises to 350 K. The average isobaric specific heats (

) for hydrogen and nitrogen are 14.239 kJ/kg-K and 1.040 kJ/kg-K, respectively. The amount of heat (in MJ) added to the cylinder is __________________ (rounded off to three decimal places).

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Air in an ideal Diesel cycle is compressed from 3 litre to 0.15 litre. It then expands during a constant pressure heat addition process to 0.3 litre. If the ratio of specific heats,

, the thermal efficiency (in %) of the cycle is ____________ (rounded to one decimal place).

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Air at 101 kPa, 15 °C and 50% relative humidity is first heated to 20 °C in a heating coil, and then humidified by spraying water on it. In the final state, the air has temperature of 25 °C and relative humidity of 85%. The amount of water sprayed (in gm per kg of dry air is _________________ (rounded off to two decimal places).

Use the following data:

The saturation pressure of water at 15 °C = 1.7057 kPa

The saturation pressure of water at 25 °C = 3.1698 kPa

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2025 · Paper 1

Question 100

Question 101

Question 102