Rajiv Gandhi Proudyogiki Vishwavidyalaya 2010 B.E Mechanical Engineering MODEL - , , Bhopal, Thermo fluid - Question Paper

(1) A frictionless piston cylinder device initially contains 200L of saturated liquid refrigerant-134-a. The piston is free to move and its mass is such that it maintains a constant pressure of 800kPa on the refrigerant. The refrigerant is now heated until its temperature rises to 500C. compute work done during the process.
(2) A steam power plant receives heat from the furnace at a rate of 280GJ/h. Heat losses to the surrounding air from the steam as it passes through the components of the power plant is 8GJ/h. The waste heat transferred to the cooling water is 145 GJ/h. (GJ = 109J)
Determine (a) The net power output of the plant.
(b) The thermal efficiency of the plant.
(3) Air enters an adiabatic nozzle steadily at 300 kPa, 200oC and 30 m/s. It leaves at 100 kPa and 180 m/s. The inlet area of the nozzle is 80 cm2.
obtain (a) The mass flow rate through the nozzle.
(b) Temperature at the exit of the nozzle.
(c) The area of the nozzle at its exit.
(4) Steam enters an adiabatic turbine at 10MPa and 5000C at a rate of three kg/s and leaves at 200kPa. The power output of the turbine is 2MW. Neglect the modifications in kinetic and potential energy
(a) Determine the temperature of the steam at the exit.
(b) Draw P-v and T-v diagram of the process showing the inlet and the exit states.

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