Applied Thermodynamics important questionsMost repeated in SPPU papers
These 9 questions appeared in more than one SPPU Applied Thermodynamics paper we have: 7 papers, from Mar 2023 to Mar 2026. The most-asked come first. Each one links to the papers it was asked in.
Repeated questions
Endsem questions (9)
- 3×asked
- 2×asked
A single stage single acting air compressor delivers 0.6 kg of air per minute at 6 bar. The temperature and pressure at the end of suction stroke are 30ºC and 1 bar respectively. The bore and stroke of the compressor are 100 mm and 150 mm respectively. The clearance is 3% of the swept volume. Assuming the index of compression and expansion to be n = 1.3. Find the following: i) Volumetric efficiency ii) Power required in mechanical efficiency is 85% and iii) Speed of the compressor.
- 2×asked
- 2×asked
- 2×asked
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.
- 2×asked
- 2×asked
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.
- 2×asked
- 2×asked
Questions count as repeated when their wording matches closely across papers. Numericals that depend on a figure are left out, since the figure changes from paper to paper.