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Thermodynamics Practice Test: First Law Applied to Flow Processes
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First Law Applied to Flow Processes topics include: Steady and variable flow processes, polytropic process. The first law of thermodynamics, also known as the law of energy conservation, states that energy can't be created or destroyed, but it can be converted from one form to another. In mechanical engineering, this law is applied to flow processes to analyze the energy transfer and transformation within a system.  The first law of thermodynamics for a flow process states that the increase in the internal energy of a system is equal to the amount of energy added to the system by matter... Show more
Thermodynamics Practice Test: First Law Applied to Flow Processes
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25 Questions

1. A cylinder/piston contains 1kg methane gas at 100 kPa, 20°C. The gas is compressed reversibly to a pressure of 800 kPa. Calculate the work required if the process is isothermal.
2. A balloon behaves such that pressure inside it is proportional to the diameter squared. It contains 2kg of ammonia at 0°C, 60% quality. They are now heated so that the final pressure is 600 kPa. Find the work done in the process.
3. A piston-cylinder contains water at 3 MPa, 500°C. It is cooled in a polytropic process to 1 MPa, 200°C. Find the specific work in the process.
4. Helium gas expands from 350 K, 125 kPa and 0.25 m^3 to 100 kPa in a polytropic process with n = 1.667. How much work does it give out?
5. A gas initially at 500°C, 1 MPa is contained in a piston-cylinder arrangement with an initial volume of 0.1 m^3. It is then slowly expanded according to the relation PV = constant until a final pressure of 100 kPa is attained. Determine the work for this process.
6. Which of the following is true for steady flow?
7. Turbines and engines ____ positive power output, and compressors and pumps ____ power input.
8. Neon at 400 kPa, 20°C is brought to 100°C in a polytropic process with n = 1.4. Find the work done.
9. Variable flow processes include
10. A cylinder/piston contains carbon dioxide at 300°C, 1 MPa with a volume of 200L. The total external force acting on the piston is proportional to V3. This system is allowed to cool to room temperature, 20°C. Find the work.
11. Fluid flow through which of the following throttles the flow?
12. Which of the following is true for a discharging tank?
13. For charging a tank,
14. Variable flow processes can be analysed by
15. A piston/cylinder contains carbon dioxide at 300 kPa, 100°C with a volume of 0.2 m^3. Weights are added at such a rate that the gas compresses according to the relation PV^1.2 = constant to a final temperature of 200°C. Determine the work done during the process.
16. Both the techniques for analysing variable flow processes gives same result.
17. A piston/cylinder contains air at 100 kPa, 300 K. A reversible polytropic process with n = 1.3 brings the air to 500 K. Any heat transfer if it comes in is from a 325°C reservoir and if it goes out it is to the ambient at 300 K. Find the specific work.
18. R-12 in a piston-cylinder arrangement is initially at 50°C, x = 1. It is then expanded in a process so that P = Cv^(−1) to a pressure of 100 kPa. Find the work.
19. For an inviscid frictionless fluid flowing through a pipe, Euler equation is given by
20. What does a nozzle do?
21. The Bernoulli equation is restricted to _____ fluids but the SFEE is valid for _____ fluids as well.
22. In a throttling device, what do we get as SFEE when changes in PE and KE are taken zero?
23. For an adiabatic compressor or pump,
24. A cylinder/piston contains 100L of air at 25°C, 110 kPa. The air is compressed in a reversible polytropic process to a final state of 200°C, 800 kPa. Assume the heat transfer is with the ambient at 25°C. Find the work done by the air.
25. A cylinder/piston contains air at 100 kPa and 20°C with a V=0.3 m^3. The air is compressed to 800 kPa in a reversible polytropic process with n = 1.2, after which it is expanded back to 100 kPa in a reversible adiabatic process. Find the net work.

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