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# ME8595 Question Bank THERMAL ENGINEERING II Regulation 2017 Anna University

## ME8595 Question Bank THERMAL ENGINEERING II

### Sample ME8595 Question Bank THERMAL ENGINEERING II

Dry saturated steam at a pressure of 8 bar enters a convergent divergent nozzle and leaves it at a pressure of 1.5 bar. If the flow is isentropic and if the corresponding expansion index is 1.33, find the ratio of cross-sectional area at exit and throat for maximum discharge. ME8595 Question Bank THERMAL ENGINEERING II

Air at a pressure of 20 bar and at a temperature of 18°C is supplied to a convergent divergent nozzle having a throat diameter of 1.25 cm and discharging to atmosphere. The adiabatic index for air is 1.4 and the characteristic constant is 287. Find the weight of air discharged per minute. ME8595 Question Bank Thermal Engineering II

Derive an expression for maximum discharge through convergent divergent nozzle for steam.

Steam enters a group of CD nozzles at 21 bars and 270℃. The discharge pressure of the nozzle is 0.07 bars. The expansion is equilibrium throughout and the loss of friction in convergent portion of the nozzle is negligible, but the loss by friction in the divergent section of the nozzle is equivalent to 10% of the enthalpy drop available in that section. Calculate the throat and exit area to discharge 14 kg/sec of steam. ME8595 Question Bank THERMAL ENGINEERING II

Steam initially dry and saturated is expanded in a nozzle from 15 bar 300°C at 1 bar. if the friction loss in the nozzle is 12% of the total head drop calculate the mass of steam discharged when exit diameter of the nozzle is 15 mm.

(a) Define critical pressure ratio of a nozzle and discuss why attainment of sonic velocity determines the maximum mass rate of flow through steam nozzle. ME8595 Question Bank THERMAL ENGINEERING II

(b) Air enters a frictionless adiabatic converging nozzle at 10 bar 500 K with negligible velocity. The nozzle discharges to a region at 2 bar. If the exit area of the nozzle is 2.5 cm2, find the flow rate of air through the nozzle. Assume for air Cp = 1005 J/kg K and Cv= 718 J/kg K. ME8595 Question Bank Thermal Engineering II

 Subject name THERMAL ENGINEERING 2 Short Name TE 2 Semester 5 Subject Code ME8595 Regulation 2017 regulation

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