Applied Thermodynamics SPPU Endsem Question Paper May 2024

Questions

1. Q1

   1. a)

      Explain the various engine variables influences abnormal combustion in SI engines.

      [8]
   2. b)

      Classify fuel injection system used in CI Engines and explain working of Bosch fuel pump with neat sketch.

      [9]
   OR

2. Q2

   1. a)

      Draw p-  diagram and explain the different stages of combustion in SI engine.

      Also asked:May 2023

      [8]
   2. b)

      What is ignition delay in CI engines? Explain any three factors affecting the ignition delay.

      Also asked:May 2023

      [9]

3. Q3

   1. a)

      During the trial of a single cylinder, four stroke oil engine, the following results were obtained: Cylinder diameter = 20cm, stroke = 40cm, mean effective pressure = 6bar,Torque = 407 Nm, Speed = 250 rpm, Fuel consumption = 4 kg/hr., C.V. of fuel = 43 MJ/kg, Cooling water flow rate = 4.5 kg/min, Air used per kg of fuel =30 kg of air / kg of fuel, rise in cooling water temperature = 45 °C, Temperature of exhaust gases = 420 °C, Room temperature = 20 °C, Mean specific heat of exhaustgas = 1 kJ/kg-K, Specific heat of water = 4.18 kJ/kg-K.Calculate, IP, BP and draw heat balance sheet for the test.

      Also asked:May 2023

      [10]
   2. b)

      Write short note on Indian Driving Cycle and European Driving Cycle.

      [8]
   OR

4. Q4

   1. a)

      In a test of a four-cylinder petrol engine of 75mm bore and 100mm stroke, the following results were obtained at full throttle at a constant speed and with a fixedsetting of the fuel supply of 0.082 Kg/min. BP with all cylinder working = 15.24 kW, BP with cylinder I is cut-off = 10.45 kW, BP with cylinder 2 is cut-off = 10.38 kW, BP with cylinder 3 is cut-off = 10.23 kW, BP with cylinder 4 is cut-off = 10.35 kW, Find, i) Total indicated power of the engine, ii) Total friction power and iii) Indicated thermal efficiency of the engine if the CV of the fliel is 44MJ/Kg.

      Also asked:Nov 2023

      [10]
   2. b)

      Define IP, BP and FP. Explain Willan’s Line Method to find Friction Power.

      [8]

5. Q5

   1. a)

      Explain with neat sketch pump assisted thermo-syphon water-cooling systems. Differentiate between air-cooling and water-cooling system.

      Also asked:May 2023

      [9]
   2. b)

      Explain with neat sketch wet sump lubrication system. Enlist the required property of a good lubricant.

      [8]
   OR

6. Q6

   1. a)

      Explain battery ignition system and state its advantages and disadvantages.

      Also asked:Nov 2023 ·May 2023

      [9]
   2. b)

      What is turbocharging? Explain with neat sketch any one turbocharger.

      [8]

7. Q7

   1. a)

      A single stage, single cylinder reciprocating air compressor delivers air at 6 bars. The rate of air taken in during suction is 12 kg/min. at 1.013 bar and 27°C. the compression take place with the index of 1.25. Calculate, i) Work required for delivering 1 kg of air. ii) Actual power required to run the compressor if  mech = 80%.

      [9]
   2. b)

      What is multi-stage compression? Justify it save power required for compression as compared to single stage compression.

      Also asked:May 2023

      [9]
   OR

8. Q8

   1. a)

      A single acting single cylinder reciprocating air compressor has stroke volume 0.012 m 3 at 111rpm. The suction pressure and temperature are 1.013 bar and 27 °C respectively. The delivery pressure is 8 bar. Calculate, i) Temperature after compression ii) Compression work done required if compression is with index 1.4. iii) Isothermal efficiency.

      [9]
   2. b)

      Give the classification of compressor? Differentiate between reciprocating and rotary compressor. 

      [9]