Uni. Roll No. Please check that this question paper contains 09 questions and 02 printed pages within first ten minutes. [Total No. of Questions: 09] [Total No. of Pages: 02] Program/ Course: B. Tech. (Sem. - 4%) ‘Name of Subject: Applied Thermodynamic Subject Code: PCME-107 Paper ID: 16196 Time Allowed: 03 Hours Max. Marks: 60 NOTE: 1) Section -A and Section-B compulsory. 2) Section-C has Two Questions Q8 and Q9, Both are compulsory, but with intemal choice. 3) Any missing data may be assumed appropriately. 4) Use of steam table is allowed. SECTION- A [Marks: 2 each] a. a) Ina three-stage reciprocating compressor, air is compressed from 98kPa to 20bar. Calculate the ideal power input to compressor for 1m’/s of air when n=1.3 b) Enlist any four differences between steam turbine and ges turbine, ©) What are the losses in axial flow compressor? 4) Enlist elements of a condensing plant. ©) Enlist any two types of positive displacement compressors ) Draw a schematic diagram of closed cycle gas turbine along with reheater and intercooler. Also represent it on PV and TS coordinates. SECTION- B [Marks: 4 each] Q2. Drive an expression for the maximum efficiency of a single stage impulse steam turbine. Q3. A centrifugal compressor delivers 16.5kg/s of air with a total head pressure ratio of 4:1. The speed of the compressor is 15000rpm. Inlet total head temperature is 20°C, slip factor 0.9, power input factor 1.04 and 80% isentropic efficiency. Calculate: i) overall diameter of the impeller and ii) Power input, Q4. A single stage steam turbine is supplied with steam at 5 bar, 200°C at the rate of 50 kg/min. It expands into a condenser at a pressure of 0.2 bar. The blade speed is 400 m/s. The nozzles are inclined at an angle of 20° to the plane of the wheel and the outlet blade angle is 30°. Neglecting friction losses, determine the power developed and blade efficiency. QS. Explain working of vane blower compressor with neat diagram. How its efficiency can be calculated? Q6. Find the required air-fuel ratio in a gas turbine whose turbine and compressor efficiencies are 85% and 80% respectively. Maximum cycle temperature is 875°C. The working fluid can be taken as air (¢, =1.00KI/kgK, y= 1.4) which enters the compressor at 1 bar and 27°C. The pressure ratio is 4, The fuel used has calorific value of 42000 ki/kg, There is a loss of 10% of calorific value in the ‘combustion chamber. Q7. Discuss in, detail the working of parallel flow type jet condenser with neat diagram. pT.0SECTION- C [Marks: 12 each] Q8. Write a note on following with neat diagram. if Ram jet ii, Turbo prop. OR ‘What is compounding of steam turbines? Classify them and explain one method of compounding with neat sketch. Q9. A two stage air compressor with complete intercooling delivers air to the mains at a pressure of 30 bar, the suction conditions being 1 bar and 15°C. If both cylinders have the same stroke, find the ratio of oylinders diameters, for the efficiency of compression to be a maximum. Assume the index of compression to be 1.3. OR Air enters the compressor of an ideal air-standard Brayton cycle at 100kPa, 300K. and is ‘compressed to 1000kPa. The temperature at the inlet to the first turbine is 1400K. The expansion takes place isentropically in two stages with reheat to 1400K between the two stages at a constant pressure do 300kPa. A regenerator having an effectiveness of 100% is also incorporated in the cycle. Determine the thermal efficiency of the cycle. Jes ii