GATE XE concept:internal-energy PYQs & Answers

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Questions 1–4 of 4. Imported answers require independent review unless marked reviewed.

Topic practice 4 questionsPage 1 of 1

The figure shows four different processes labeled 1, 2, 3, and 4 for the same closed system containing an ideal gas. The curves labeled

, and

are isotherms. For which one of the four processes, the magnitude of internal energy change is the highest?

Diagram for Engineering Sciences question 91

Your answerChoose one option.

Process 1

Process 2

Process 3

Process 4

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Air in a closed system undergoes a thermodynamic process from an initial temperature of 300 K to the final temperature of 400 K. The specific heat of air at constant volume,

varies linearly with the temperature,

(in K) as

Change in the specific internal energy of the air in the system is ______ kJ/kg (round off to 2 decimal places).

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An insulated rigid tank of volume 10 m³ contains air initially at 1 MPa and 600 K. A valve connected to the tank is opened, and air is allowed to escape until the temperature inside the tank drops to 400 K. The temperature of the discharged air can be approximated as the average of the initial and final temperatures of the air in the tank. Neglect kinetic and potential energies of the discharged air. Assume that air behaves as an ideal gas with constant specific heat so that internal energy

and enthalpy

. Then, the final pressure of the air in the tank is ______ MPa (round off to 2 decimal places).

Assume

kJ/(kg K),

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A closed system containing 8 kg of gas undergoes an expansion process following the relation

. The initial and final pressures are 1 MPa and 5 kPa, respectively, while the initial volume is 1 m

. If the specific internal energy of the gas decreases by 40 kJ/kg during the process, the heat transfer (in kJ) associated with the process (rounded off to 1 decimal place) is ________.

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GATE XE concept:internal-energy PYQs

How to practice concept:internal-energy

Question 91

Question 93

Question 103

Question 18