Download GTU BE/B.Tech 2019 Summer 4th Sem New 2140106 Basic Engineering Thermodynamics Question Paper

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Subject Code: 2140106

GUJARAT TECHNOLOGICAL UNIVERSITY

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SEMESTER-IV(NEW) — EXAMINATION — SUMMER 2019

Subject Name: Basic Engineering Thermodynamics

Time: 02:30 PM TO 05:00 PM

Instructions:

1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q.1

1. Define availability, unavailability and irreversibility. (MARKS 03)
2. With an example explain an open system and closed system. (MARKS 04)

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3. List the Engineering Application of SFEE and explain any two. (MARKS 07)

Q.2

1. Discuss limitations of a Carnot cycle. (MARKS 03)
2. Draw and explain Rankine cycle. (MARKS 04)
3. With usual notations prove that ?dQ/T <=0. (MARKS 07)

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OR

1. Derive the expression for efficiency and mean effective pressure for diesel cycle. (MARKS 07)

Q.3

1. Draw P-V and T-S diagram of Brayton cycle. (MARKS 03)
2. Explain the available energy referred to finite heat source. (MARKS 04)

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3. List the thermodynamic processes involved in ideal Otto cycle. Derive the expression of efficiency of Otto cycle. (MARKS 07)

OR

1. State the principle of increase of entropy. List the four application of entropy principle. (MARKS 03)
2. Write a note on PMMI1. (MARKS 04)
3. State and explain Dalton’s law of partial pressure and Avogadro’s law. (MARKS 07)

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Q.4

1. Justify that energy is property of the system. (MARKS 03)
2. What are the causes of irreversibility? (MARKS 04)
3. State Kelvin-Plank Statement of Second Law of thermodynamics and show that violation of Kelvin-Plank statement leading to violation of Clausius statement. (MARKS 07)

OR

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1. List applications of various components of a Rankine cycle. (MARKS 03)
2. Prove that, C_p-C_v = TR*v/k_T (MARKS 04)
3. Dry and saturated steam at pressure of 10.5 bar is supplied to a turbine and expanded isentropically to a pressure 0.075 bar. Calculate Thermal efficiency of Rankine cycle. (MARKS 07)

Q.5

1. Explain in brief the characteristics of entropy. (MARKS 03)

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2. Explain the effect of superheating of steam on the performance of Rankine cycle. (MARKS 04)
3. Why Carnot cycle is a hypothetical cycle? Enlist the assumptions considered for Carnot cycle and prove the expression of efficiency of a cycle following Carnot cycle. What are the relative modifications done in Ranking cycle? (MARKS 07)

OR

1. Define cut off ratio, mean effective pressure and steam rate. (MARKS 03)
2. Prove that all reversible engines working between the two constant temperatures Reservoirs have the same efficiency. (MARKS 04)

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3. Define property. What is meant by intensive and extensive property? State the differences between Microscopic approach and macroscopic approach. (MARKS 07)

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Date: 17/05/2019

Total Marks: 70

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