JNTUA B.Tech III Year 1st Sem Thermal Engineering-II 2022 Question Paper

 Jawaharlal Nehru Technological University, Anantapur Question Paper

Subject Code: 15A03501 

B Tech III Year I Semester (R15) Supplementary Examinations February 2022 

THERMAL ENGINEERING - II 

(Mechanical Engineering) 

Time: 3 hours 

Max. Marks: 70 

PART — A (Compulsory Question) 

1 Answer the following (10 X 02 = 20 Marks) 

(a) Explain the Rankine cycle with neat sketch 

(b) Explain the reheating cycle with neat sketch 

(c) Explain the function of low pressure boiler 

(d) What is artificial draught? 

(e) Define critical pressure ratio 

(f) Explain condenser efficiency 

(g) Explain significance of velocity diagram 

(h) What is the principle of reaction turbine? 

(i) What is the principle of combustion chamber in gas turbine plant? 

(j) Define thrust power. 

PART — B (Answer all the questions. 05 X 10 = 50 Marks) 

2 (a) Explain the effect of maximum pressure and mean temperature heat addition on thermal efficiency. (b) A steam turbine receives steam at pressure 20 bar and superheated to 88 6°C The exhaust pressure is 0.07 bar and the expansion of steam takes place isentropically. Using steam table only, calculate the following (i) Heat supplied, assuming that the feed pump supplies water to the boiler at 20 bar (ii) Heat rejected (iii) Net work done (iv) Work done by the turbine. (v) Thermal efficiency (vi) Theoretical steam consumption. 

OR 3. (a) Explain the Reheat cycle with PV and TS diagrams. 

(b) In a steam power cycle, the steam supply is at 15 bar and dry and saturated. The condenser pressure is 0.4 bar. Calculate the Carnot and Rankine efficiencies of the cycle. Neglect pump work. 

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