Engineering Thermodynamics SPPU Endsem Question Paper Nov 2023

Questions

1. Q1

   1. a)

      Give the following statements of second law of thermodynamics. i) Clausius statement ii) Kelvin-Plank statement

      Also asked:Oct 2023

      [7]
   2. b)

      This part has equations that don’t show as text. Open the PDF to read it.

      [10]
   OR

2. Q2

   1. a)

      A system at 500 K receives 7200 KJ/min from a source at 1000 K. The temperature of atmosphere is 300 K. Assuming that the temperature of system and source remain constant during heat transfer, Determine: i) The entropy produced during heat transfer ii) The decrease in available energy after heat transfer.

      Also asked:May 2023

      [8]
   2. b)

      State Boyle’s law and Charle’s law and derive an equation of the state for a perfect gas?

      Also asked:May 2023

      [9]

3. Q3

   1. a)

      Explain the following terms: (i) Saturated steam, (ii) Dry saturated steam, (iii) Wet steam, (iv) Superheated steam, (v) Dryness fraction of steam, (vi) Specific volume of steam, and (vii) Saturated water.

      Also asked:May 2023

      [8]
   2. b)

      0.025 m 3 of steam at 3.5 bar and dryness fraction 0.8 is converted into dry saturated steam at 11 bar. By how much are the enthalpy and internal energy changed?

      [10]
   OR

4. Q4

   1. a)

      This part has equations that don’t show as text. Open the PDF to read it.

      [12]
   2. b)

      Explain the constructional details & working of Throttling calorimeter?

      Also asked:Nov 2025 ·May 2023

      [6]

5. Q5

   1. a)

      How the analysis of exhaust and flue gas carried out? Explain in details with neat sketch?

      [6]
   2. b)

      This part has equations that don’t show as text. Open the PDF to read it.

      [11]
   OR

6. Q6

   1. a)

      What do you mean by Higher Calorific value of fuel (HCV) and lower calorific value of fuel (LCV)? Name the apparatus used for the determination of HCV of the fuel.

      [6]
   2. b)

      A fuel C 10 H 22 was burnt using an air fuel ratio of 13:1 by weight. Determine the complete gravimetric analysis of the products of combustion, assuming that the whole amount of hydrogen burns to form water vapour and there is neither any free oxygen nor any free carbon. The carbon burns to CO 2 and CO . Air contains 77% of nitrogen and 23% of oxygen by weight.

      [11]

7. Q7

   1. a)

      What is the function of Boiler Accessories? Explain with neat sketches any two of the accessories?

      [8]
   2. b)

      In a boiler test 1250 Kg of coal are consumed in 24 hours. The mass of water evaporated is 13000 Kg and the mean effective pressure is 7 bar. The feed water temperature was 40°C, heating value of coal is 30000 KJ/Kg. The enthalpy of 1 Kg of steam at 7 bar is 2570.7 KJ. Determine: i) Equivalent Evaporation per Kg of coal; ii) Efficiency of the Boiler.

      [10]
   OR

8. Q8

   1. a)

      What do you mean by Boiler Draught and how are they classified. Enumerate the advantages of Mechanical Draught? The following observations were made during the trial of a boiler plant consisting of a battery of 6 Lancashire boilers and an economizer: Calorific value of fuel/coal per Kg .................................29915 KJ Mass of feed water per Kg of dry coal ...............................9.1 Kg Equivalent Evaporation from and at 100°C per Kg of dry coal .... .9.6 Kg Temperature of feed water to economizer .................. 12°C Temperature of feed water to boiler ................ 105°C

      [6]
   2. b)

      This part has equations that don’t show as text. Open the PDF to read it.

      [12]