Thermodynamics Question Bank
Unit 1
- Explain the following terms: System, Surrounding, Control volume, Universe, and Types of System
- Explain about the concept of continuum with diagram
- Define the following terms: State, Property, Process, Cycle
- Explain about Thermodynamic Equilibrium, its types along with suitable examples
- Explain quasi-static process. State its salient features
- Distinguish between macroscopic and microscopic views
- Explain reversible and irreversible processes, and causes of irreversibility
- Explain Zeroth law of thermodynamics and concept of temperature
- Explain work and heat, its types and sign conventions
- Identify whether the system is open or closed:
- i) A tube of a bicycle filled with air
- ii) A jet engine in flight
- iii) A household refrigerator in operation
- iv) Water pump
- v) Pressure cooker without whistling
- vi) Steam turbine
- vii) Car battery
- viii) An electric geyser
UNIT-2
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State and explain the First Law of Thermodynamics for a closed system undergoing a cyclic process.
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Define the following terms i) Joule’s Experiment, ii) Energy in State and iii) Energy in Transition.
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Explain the following terms i) Point function, ii) Path function, iii) Enthalpy, and iv) Specific heat at constant pressure.
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a) Explain about PMM-I. Why such a machine is considered impossible according to the First Law of Thermodynamics, explain with details.
b) During a certain process, the specific heat capacity of a system is given by C = (0.4 + 0.004 T) kJ/kg°C. Find the heat transferred and mean specific heat of gas, when the temperature changes from 25°C to 125°C. The mass of the system is 5 kg.
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Derive the steady-flow energy equation along with its assumptions.
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Discuss the applications of steady-flow energy equation in devices such as nozzles, diffusers, turbines, compressors, and throttling along with its assumptions.
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a) A fluid at a pressure of 3 bar, and with specific volume of 0.18 m3 /kg, contained in a cylinder behind a piston expands reversibly to a pressure of 0.6 bar according to a law, p = Cv2 where C is a constant. Calculate the work done by the fluid on the piston.
b) Discuss the limitations of the First Law of Thermodynamics.
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Air flows steadily at the rate of 0.5 kg/s through an air compressor, entering at 7m/s velocity, 100 kPa pressure, and 0.95 m3 /kg volume, and leaving at 5 m/s, 700 kPa, and 0.19 m3 /kg. The internal energy of the air leaving is 90 kJ/kg greater than that of the air entering. Cooling water in the compressor jackets absorbs heat from the air at the rate of 58 kW.
(a) Compute the rate of shaft work input to the air in kW.
(b) Find the ratio of the inlet pipe diameter to outlet pipe diameter.