GATE XE year:2025 PYQs & Answers — Page 10

Questions 91–100 of 175. Imported answers require independent review unless marked reviewed.

The inlet and outlet temperatures of the flowing fluid during a steady state flow process are the same as that of the surroundings. If the changes in kinetic and potential energies are neglected, the maximum power that can be obtained is equal to

Your answerChoose one option.

the rate of increase in enthalpy of the flowing fluid

the rate of decrease in Helmholtz energy of the flowing fluid

the rate of decrease in Gibbs free energy of the flowing fluid

the rate of decrease in internal energy of the flowing fluid

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refers to the ratio of specific heats, the air-standard efficiency of an Otto cycle is

Your answerChoose one option.

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Let

and

denote the absolute temperatures of high and low temperature reservoirs, respectively. The coefficient of performance of a reversible refrigerator operating between these two reservoirs is

Your answerChoose one option.

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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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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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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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For an ideal gas turbine cycle,

and

are the compressor inlet temperature and turbine inlet temperature respectively. The ratio

is denoted by

and the ratio of specific heats is denoted by

. For any given

, the optimum pressure ratio for the maximum specific work output is

Your answerChoose one option.

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For a pure substance that expands on freezing, which of the following statement(s) is/are CORRECT

Your answerSelect all correct options. You can choose more than one.

Temperature of the liquid phase can be lower than the temperature at the triple point

Critical pressure is equal to the pressure at the triple point

Highest pressure at which the vapour phase can exist is the pressure at the triple point

Highest temperature at which solid-liquid phase change can happen is the temperature at the triple point

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Consider a gas obeying the relation

, where b and R are constants. Which of the following statement(s) is/are CORRECT about the specific heat capacity at constant pressure?

Your answerSelect all correct options. You can choose more than one.

It is independent of temperature

It is a function of pressure

It is a function of temperature

It is independent of both specific volume and pressure

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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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GATE XE year:2025 PYQs

Question 91

Question 92

Question 93

Question 94

Question 95

Question 96

Question 97

Question 98

Question 99

Question 100