Important RGPV Question
ME-601, Thermal Engineering and Gas Dynamics
VI Sem, ME
UNIT 1 – Steam Generators and Boilers
Q.1) Draw a neat sketch of Lamont Boiler, slow flue gas and water path on it and have important path on the sketch. (RGPV MAY 2024)
Q.2) Define and explain followings. (RGPV MAY 2024)
i) Heat balance sheet ii) Equivalent evaporation
Q.3) A steam turbine plant is supplied with steam at pressure of 17 bar and superheated to 100°C. The exhaust pressure is 0.06 bar. The temperature of condensate in the hot well is actually 33°C (Vf =0.001 m³/kg) if the measured steam condensate is 5 kg/kWh and if generator efficiency is 96%, what is overall thermal efficiency of the whole plant? (RGPV MAY 2024)
Q.4) Describe high pressure boiler ‘Lamont’ with neat sketch. (RGPV MAY 2023)
Q.5) Explain three boiler mountings and accessories. (RGPV MAY 2023)
Q.6) Express the overall efficiency of a steam plant as the product of boiler, turbine, generator and cycle efficiencies. (RGPV MAY 2023)
Q.7) A steam power station uses the following cycle:
Steam at boiler outlet-150 bar, 550°C Reheat at 40 bar to 550°C Condenser at 0.1 bar. Using the Mollier chart and assuming ideal processes, find the a) Quality at turbine exhaust b) Cycle efficiency c) Steam rate (RGPV MAY 2023)
Q.8) What is the fundamental difference between the operation of impulse and reaction steam turbines? (RGPV MAY 2022)
Q.9) What is Steam Turbine? Explain boiler efficiency and equivalent evaporation in detail. (RGPV MAY 2022)
Q.10) Explain the need of compounding in steam turbines. (RGPV MAY 2022)
UNIT 2 – Vapour Cycles
Q.1) Explain with diagram the effect of boiler and condenser pressure on the efficiency of ranking cycle. (RGPV MAY 2023)
Q.2) Draw and explain vapor Carnot cycle what are its limitations. (RGPV MAY 2023)
Q.3) Describe Rankine cycle in detail. (RGPV MAY 2022)
Q.4) Find out the expression for Rankine cycle efficiency. (RGPV MAY 2022)
Q.5) Differentiate between regenerative and reheat Rankine cycle with TS diagram. (RGPV MAY 2022)
Q.6) Explain binary vapour cycle in detail. (RGPV MAY 2022)
Q.7) How the condition of steam will effect the efficiency of Rankine Cycle? (RGPV MAY 2022)
UNIT 3 – Gas Dynamics
Q.1) Explain the following. i) Mach Number ii) Mach Cone iii) Zone of action iv) Zone of silence. (RGPV MAY 2024)
Q.2) Derive the conditions for maximum output of a using a reheater and regenerator in a gas turbine. (RGPV MAY 2023)
Q.3) Explain the effect of clearance on volumetric efficiency of compressor with diagram. (RGPV MAY 2023)
Q.4) What is Mach number? (RGPV MAY 2022)
Q.5) Describe its (Mach Number) different values for which body is said to be supersonic and hypersonic speed. (RGPV MAY 2022)
UNIT 4 – Air Compressors
Q.1) Explain working of reciprocating air compressors. (RGPV MAY 2024)
Q.2) Deduce an equation of work input to reciprocating Air compressor without considering clearance. (RGPV MAY 2024)
Q.3) A single stage reciprocating air compressor takes in 8m³/min of air at 1 bar and 30°C and delivers it at 6 bar. The clearance is 5% of the stroke, the expansion and compression are polytrophic with the value of n = 1.3. Calculate a) Temperature of delivered air b) Volumetric efficiency c) Power absorbed by the compressor (RGPV MAY 2024)
Q.4) A two-stage air compressor with perfect intercooling takes in air at 1 bar pressure and 27°C. The law of compression in both the stages is pv1.3 constant, the compressed air is delivered at 9 bar from the H.P. cylinder to an air receiver. Calculate, per kilogram of air, i) the minimum work done ii) the heat rejected to the intercooler. (RGPV MAY 2023)
Q.5) Derive the condition for minimum work done in a multistage compressor. (RGPV MAY 2023)
Q.6) Define the following terms related to compressor. i) Isentropic efficiency ii) Isothermal efficiency iii) Mechanical efficiency. (RGPV MAY 2023)
Q.7) Classify the various types of air compressors. (RGPV MAY 2022)
Q.8) What are the advantages of multi stage compression with internal cooling over single stage compression for the same pressure ratio? (RGPV MAY 2022)
Q.9) Explain double acting compressor. (RGPV MAY 2022)
UNIT 5 – Nozzles and Condensers
Q.1) Discuss types of condensers. (RGPV MAY 2024)
Q.2) Discuss effect of friction on flow through nozzles define nozzle efficiency. (RGPV MAY 2024)
Q.3) Dry saturated steam at 6.5 bar with negligible velocity expands isentropically in a convergent divergent nozzle to 1.4 bar and dryness fraction of 0.95. Determine the final velocity of steam from the nozzle if 13% heat is lost in friction, find the % reduction in final velocity. (RGPV MAY 2024)
Q.4) A vessel of volume 0.04 m³ contains a mixture of saturated water and saturated steam at a temperature of 250°C The mass of the liquid present is 9 kg. Find the pressure, the mass, the specific volume, the enthalpy, the entropy, and the internal energy. (RGPV MAY 2023)
Q.5) Calculate the velocity of sound in super-heated steam at a pressure of 4 bar and temperature of 300°C. The specific volume of steam is 0.338 m³/kg. (RGPV MAY 2023)
Q.6) Derive the conditions for maximum discharge in nozzles. (RGPV MAY 2023)
Q.7) Define nozzle efficiency and critical pressure ratio. (RGPV MAY 2022)
Q.8) What are the differences between supersaturated flow and isentropic flow through steam nozzles? (RGPV MAY 2022)
Q.9) What are the conditions that produce super saturation of steam in nozzles? (RGPV MAY 2022)
— Best of Luck for Exam —
