Download GTU BE/B.Tech 2018 Winter 4th Sem New 2142004 Engineering Thermodynamics Question Paper

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Subject Code: 2142004

BE - SEMESTER-IV (NEW) EXAMINATION - WINTER 2018

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Subject Name: Engineering Thermodynamics

Time: 02:30 PM TO 05:00 PM

Date: 10/12/2018

Total Marks: 70

Instructions:

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1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q.1

1. Define following terms: (1) Isolated system, (2) Intensive property (3) Extensive property [03]

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2. Explain Quasi-static Process with diagram. [04]
3. Prove the equivalency of Kelvin-Plank and Clausius statements. [07]

Q.2

1. Explain what is meant by PMM1. Why is such a device not possible? [03]
2. What do you mean by Thermal equilibrium? Explain it with suitable examples. [04]

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3. Write steady flow energy equation in case of diffuser, boiler, turbine, nozzle, pump, heat exchanger and condenser. [07]

OR

1. Derive expression for air standard efficiency of diesel cycle. [07]

Q.3

1. Explain. Discuss limitations of first law of thermodynamics. [03]

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2. Define Entropy and show that it is a property of the system. [04]
3. Write note on reversibility and irreversibility. [07]

OR

1. Give statements for second law of thermodynamics. [03]
2. State and prove Carnot's theorem. [04]

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3. Explain briefly Otto cycle with help of p-v and T-s diagram and derive an expression for ideal efficiency of Otto cycle. [07]

Q.4

1. What do you understand by Joule-Thomson coefficient? [03]
2. Derive the two T- ds equation starting from the basics. [04]
3. A heat engine is operated between 700° C and 30° C. It drive a heat pump which works between 100° C and 30° C. Efficiency and COP of the heat engine and the heat pump are half of that of corresponding Carnot values. Calculate amount of heat rejected by heat pump at 100° C when 100 KJ is absorbed by heat engine at 700° C. [07]

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OR

1. Explain Zeroth law of thermodynamic. [03]
2. Write comparison of Carnot and Rankine cycle. [04]
3. Compare otto, diesel and dual cycle for:
   1. (1) Constant maximum pressure and heat input.
   2. (2) Same maximum pressure and temperature. [07]

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Q.5

1. State and explain law of corresponding states. [03]
2. State and explain Dalton’s law of partial pressure. [04]
3. In an air standard Otto cycle, the maximum and minimum temperatures are 1600°C and 20°C. The heat supplied per kg of air is 900 kJ. Determine the compression ratio, the cycle efficiency and the ratio of maximum to minimum pressure in the cycle. Take Cv = 0.718kJ/kgK and ? = 1.4 [07]

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OR

1. Define heat engine. Also explain the need for a sink in a heat engine. [03]
2. State and explain Avogadro’s law [04]
3. In an ideal Diesel cycle, the temperature at the beginning and at the end of compression are 57°C and 603°C respectively. The temperature at the beginning and end of expansion are 1950°C and 870°C respectively. Determine the ideal efficiency of the cycle. If the pressure at the beginning is 1 bar, calculate the maximum pressure in the cycle. [07]

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