Thermodynamics
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This document contains 5 assignments for a Thermodynamics course at Maharishi University of Information Technology. The assignments cover various topics in thermodynamics including the basic concepts and definitions, the laws of thermodynamics, availability and irreversibility, properties of pure substances and steam, psychrometrics, refrigeration cycles, and more. Students are asked to define key terms, derive important equations, explain fundamental concepts and processes, and solve related problems. The assignments provide a comprehensive review of the essential principles and applications of thermodynamics.
Thermodynamics
- 1. MAHARISHI UNIVERSITY OF INFORMATION TECHNLOGY MECHANICAL ENGINEERING DEPRTMENT Thermodynamics (MME-401) ASSIGNMENT NO. 1 Date ofrelease: - 29-01-2020 Date ofsubmission: - 05-02-2020 1. Define a thermodynamic system. Differentiate between open system, closed system and an isolated system. 2. How does a homogeneous system differ from a heterogeneous system? 3. Explain the following terms : (i) State,(ii) Process,and (iii) Cycle. 4. Explain briefly zeroth law of thermodynamics. 5. What is a quasi-static process? 6. What do you mean by reversible work? 7. Define internal energy and prove that it is a property of a system. 8. Explain the First Law of Thermodynamics as referred to closed systems undergoing a cyclic change. 9. State the First Law of Thermodynamics and prove that for a non-flow process, it leads to the energy equation Q = U + W. 10. What is the mechanical equivalent of heat? Write down its value when heat is expressed in kJ and work is expressed in N-m. 11. What do you mean by Perpetual motion machine of first kind-PMM 1? Why only in constant pressure non-flow process, 12. Write down the general energy equation for steady flow system and simplify when applied for the following systems : (i) Centrifugal water pump (ii) Reciprocating air compressor (iii) Steam nozzle (iv) Steam turbine (v) Gas turbine. 13. Explain clearly the difference between a non-flow and a steady flow process. Good Luck
- 2. MAHARISHI UNIVERSITY OF INFORMATION TECHNLOGY MECHANICAL ENGINEERING DEPRTMENT Thermodynamics (MME-401) ASSIGNMENT NO. 2 Date ofrelease: - 10-02-2020 Date ofsubmission: - 17-02-2020 1. State the limitations of first law of thermodynamics. What is the difference between a heat engine and a reversed heat engine? 2. Enumerate the conditions which must be fulfilled by a reversible process. Give some examples of ideal reversible processes. 3. What is an irreversible process? Give some examples of irreversible processes. 4. Give the following statements of second law of thermodynamics. (i) Clausius statement (ii) Kelvin-Planck statement. 5. Define heat engine, refrigerator and heat pump. What is the perpetual motion machine of the second kind? 6. What do you mean by Clausius inequality? 7. Describe the working of a Carnot cycle. Derive an expression for the efficiency of the reversible heat engine. 8. What do you mean by the term Entropy? What are the characteristics of entropy? 9. Prove that entropy is a property of a system. Derive an expression for the change in entropy of the universe. What is a temperature-entropy diagram? 10. . Derive expressions for entropy changes for a closed system in the following cases : (i) General case for change of entropy of a gas (ii) Heating a gas at constant volume (iii) Heating a gas at constant pressure (iv) Polytrophic process. 11. Give an expression for entropy changes for an open system. Good Luck
- 3. MAHARISHI UNIVERSITY OF INFORMATION TECHNLOGY MECHANICAL ENGINEERING DEPRTMENT Thermodynamics (MME-401) ASSIGNMENT NO. 3 Date ofrelease: - 24-02-2020 Date ofsubmission: - 16-03-2020 1. Define the term availability. Is the availability function same for a non-flow and a flow process? 2. Derive an expression for availability in non-flow systems. 3. Derive an expression for availability in steady flow systems. 4. Differentiate between availability function, Helmholtz and Gibbs energy function 5. Derive an expression for decrease in available energy when heat is transferred through a finite temperature difference. 6. Derive a general expression for irreversibility in (i) non-flow process, (ii) steady flow process. 7. What is the effectiveness of a system and how does it differ from efficiency? Define Second law efficiency. 8. Define the co-efficient of : (i) Volume expansion (ii) Isothermal compressibility (iii) Adiabatic compressibility. 9. Derive the Maxwell relations and explain their importance in thermodynamics. 10. For a perfect gas, show that the difference in specific heats is 駒 駒 = 11. For the following given differential equations, du = Tds pdv and dh = Tds + vdp Prove that for perfect gas equation, 12. Explain Joule-Thompson coefficient and Inversion curve? 13. What are the Conditions for exact differentials? Explain. Good Luck
- 4. MAHARISHI UNIVERSITY OF INFORMATION TECHNLOGY MECHANICAL ENGINEERING DEPRTMENT Thermodynamics (MME-401) ASSIGNMENT NO. 4 Date ofrelease:- 23-03-2020 Date ofsubmission:- 30-03-2020 1. What is a pure substance? Draw and explain a p-T (pressure-temperature) diagram for a pure substance. 2. What is a triple point? Explain with a neat diagram p-V-T surface. 3. Does wet steam obey laws of perfect gases? Describe the process of formation of steam and give its graphical representation also. 4. Explain the following terms relating to steam formation : (i) Sensible heat of water,(ii) Latent heat of steam, (iii) Dryness fraction of steam,(iv) Enthalpy of wet steam,and (v) Superheated steam. 5. What advantages are obtained if superheated steam is used in steam prime movers? 6. What do you mean by the following : (i) Internal latent heat (ii) Internal energy of steam (iii) External work of evaporation (iv) Entropy of evaporation (v) Entropy of wet steam (vi) Entropy of superheated steam 7. Define the following terms : (i) Saturated air (ii) Dry bulb temperature (iii) Dew point temperature (iv) Relative humidity (v) Specific humidity. 8. Describe briefly any two of the following processes : (i) Sensible heating (ii) Cooling and dehumidification (iii) Heating and humidification (iv) Heating and dehumidification. 9. Describe the different operations of Rankine cycle. Derive also the expression for its efficiency. Good Luck
- 5. MAHARISHI UNIVERSITY OF INFORMATION TECHNLOGY MECHANICAL ENGINEERING DEPRTMENT Thermodynamics (MME-401) ASSIGNMENT NO. 5 Date ofrelease:- 06-04-2020 Date ofsubmission:- 13-04-2020 1. Explain in brief the necessity of Refrigeration and define Refrigeration effect 2. Sketch Reversed Carnot cycle on P-V and T-S. List process involved. Refrigerating machine working between the temperature limits of 13属C and 37属C and has 90% relative COP. It consumes 4.8 kW power. Determine TR capacity. For same TR capacity, how much power will be consumed by carnot refrigerator? Also for the same power consumption, determine TR capacity of carnot refrigerator operating between same temperature limits. 3. Define Refrigeration. State types of refrigeration systems 4. Discussed various methods of producing cooling. 5. Define and explain below terms: a. Ton of refrigeration (TR) b. COP of refrigerator 6. Explain the working of Vapour compression refrigeration system with the help of a neat sketch. 7. Explain effect of sub cooling. Mention the limitations of Simple vapour compression refrigeration cycle. 8. Explain the effect of sub-cooling and superheating on saturated vapour compression cycle with necessary diagram