Download Calicut University MBBS 2007 August Gynaecology Paper I Previous Question Paper

2.a) Discuss about thermodynamic equilibrium.

b) A gas of mass 1.5 kg undergoes a quasi-static expansion which follows a relationship p = a + bV, where a and b are constants. The initial and final pressures are 1000 kPa and 200 kPa respectively and the corresponding volumes are 0.20 m³ and 1.20 m³. Calculate the work done by the gas.

OR

3.a) Explain about displacement work.

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b) A fluid is contained in a cylinder by a spring-loaded, frictionless piston so that the pressure in the fluid is a linear function of the volume (p = a + bV). The internal energy of the fluid is given by U = (34 + 3.15p V) where U is in kJ, p in kPa and V in m³. If the fluid changes from an initial state of 170 kPa, 0.03 m³ to a final state of 400 kPa, 0.06 m³, with no work other than that done on the piston, find the direction and magnitude of the work and heat transfer.

4.a) State and prove Clausius inequality.

b) Two kg of water at 80^oC is mixed adiabatically with 3 kg of water at 30^oC in a constant pressure process of 1 atmosphere. Find the increase in the entropy of the total mass of water due to the mixing process (C_p for water = 4.187 kJ/kg K).

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OR

5.a) Explain the working of heat pump, refrigerator and heat engine with schematic diagrams.

b) A reversible heat engine operates between two reservoirs at temperatures of 600^oC and 40^oC. The engine drives a refrigerator which operates between reservoirs at temperatures of 40^oC and -20^oC. The heat transfer to the heat engine is 2000 kJ and the net work output of the combined engine refrigerator plant is 360 kJ.
i) Determine the heat transfer to the refrigerant and the net heat transfer to the reservoir at 40^oC.

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6.a) Draw p-T diagram for water and explain.

b) Steam initially at 1.5 MPa, 300^oC expands reversibly and adiabatically in a steam turbine to 40^oC. Determine the ideal work output of the turbine per kg of steam.

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OR

7.a) Explain how the dryness fraction of steam is determined with a throttling calorimeter.

b) A vessel of volume 0.04 m³ contains a mixture of saturated water and saturated steam at a temperature of 250^oC. The mass of the liquid present is 9 kg. Find the pressure, the mass of the vapor, the specific volume and the enthalpy.

8.a) Write short notes on the following:

i) Avogadro's Law ii) Law of corresponding states.

b) A vessel of capacity 0.3 m³ contains 2 kg of CO₂ at 27^oC. Calculate the pressure exerted by CO₂ by using:

i) Perfect gas equation ii) Vander Waal's equation.

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OR

9.a) Define the terms:

i) Dry bulb temperature ii) Wet bulb temperature iii) Dew point temperature.

b) Atmospheric air at 30^oC and 75% relative humidity enters a cooling coil at a rate of 200 m³/min. The coil dew point temperature is 10^oC. Determine the rate of heat and moisture removal from the air.

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10.a) Derive an expression for the air standard efficiency of the Otto cycle.

b) An air standard Diesel cycle has a compression ratio of 16. At the beginning of the compression stroke the air is at 100 kPa and 27^oC. The maximum temperature in the cycle is 1477^oC. Determine:

i) the cut-off ratio ii) the heat supplied per kg of air iii) the cycle efficiency.

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OR

11.a) Explain briefly the various methods to improve the performance of Rankine cycle.

b) A steam power plant operates on the Rankine cycle. Steam enters the turbine at 4 MPa and 400^oC and is condensed in the condenser at a pressure of 10 kPa. Determine:

i) the thermal efficiency of the cycle ii) the mass flow rate of steam if the net power output is 100 MW.

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