Subject Code: 3130507
BE - SEMESTER- III (New) EXAMINATION — WINTER 2019
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Subject Name: Chemical Engineering Thermodynamics I
Date: 30/11/2019
Time: 02:30 PM TO 05:00 PM
Total Marks: 70
Instructions:
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- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
Q.1 (a) Write short note on “Gibb’s phase rule”. [03]
(b) Distinguish between intensive and extensive properties with suitable example. [04]
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(c) Explain the P-V-T behavior of pure fluids with the help of neat diagram. [07]
OR
Q.1 (a) Distinguish between state function and path function. [03]
(b) Explain about principle of corresponding states. [04]
(c) State first law of thermodynamics? Derive the expressions for 1st law of thermodynamics for non-flow process. [07]
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Q.2 (a) Heat is transferred to 10 kg of air which is initially at 100 kPa and 300 K until its temperature reaches 600 K. Determine the change in internal energy and change in enthalpy, amount of heat supplied and the work done for a Constant volume process. Assume air as an ideal gas. Given that: R=8.314 kJ / kmol K, Cp=29.099 kJ / kmol K, Cv =20.785 kJ / kmol K and molecular weight of air =29 [03]
(b) State various equations of state for real gases. [04]
(c) Define the following [07]
- Sensible heat
- Latent heat
- Standard heat of combustion
- Standard heat of formation
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OR
Q.2 (a) Explain about Van-Der-Waals equation of state. [03]
(b) Discuss Virial equations and their applications. [04]
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(c) Define the statements for the second law of thermodynamics [07]
- Clausius Statement
- Kelvin — Planck Statement
Q.3 (a) Discuss effect of temperature on heat of reaction and derive necessary equation. [03]
(b) Write a short note on Third law of thermodynamics. [04]
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(c) Describe absorption refrigeration cycle. [07]
OR
Q.3 (a) Explain and prove Carnot’s principle with neat sketch. [03]
(b) Write a short note on Jet ejector. [04]
(c) Using Maxwell’s equation prove that : dH = CpdT + V(1 - BT)dP Where B is coefficient of volume expansion [07]
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Q.4 (a) Express entropy change when any ideal gas changes its state from (P1, V1, T1) to (P2, V2, T2) for following process- [03]
- Constant volume process.
- Constant pressure process.
- Isothermal process.
(b) Assuming air is mixture of 21 % oxygen and 79% nitrogen by volume calculate entropy of 1 kmol air relative to pure oxygen and nitrogen, all at the same temperature and pressure. [04]
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(c) Discuss briefly about single and multistage compressors. [07]
OR
Q.4 (a) What is the criterion of exactness? Using the criterion of exactness derive the Maxwell equation. [03]
(b) Discuss any three major desirable properties of good refrigerant. [04]
(c) Write a short note on Thermodynamic Diagrams. [07]
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Q.5 (a) A refrigeration machine operating at a condenser temperature at 290 K needs 1 kW of power per ton of refrigeration. [03]
(b) Determine: [04]
- Coefficient Of Performance(COP)
- Heat rejected to the condenser
- The lowest temperature that can be maintained.
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(c) Given that: 1 Ton of refrigeration = 12660 kJ/h=3516.67 W [07]
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