STUPIDSID
1 (a)
Define Nozzle. Also describe the effects of friction on performance of the steam nozzle with h-s diagram.
7 M
1 (b)
Write detailed classification of Steam Turbines.
7 M
2 (a)
What are assumptions are to be made while analyzing the Brayton cycle. Also derive the equation of Thermal Efficiency for it.
7 M
Answer any two question from Q2 (b) or Q2 (c)
2 (b)
A nozzle is supplied with steam at 15 bar and 250°C with negligible velocity and it leaves the nozzle at 1.2 bar pressure. There are 10 % friction losses throughout the passage of the nozzle. Determine the maximum mass flow rate and the exit diameter if the throat diameter is 0.8 cm.
7 M
2 (c)
In a reaction turbine, the fixed blades and moving blades are of same shape but reverse in direction. The angles of the receiving tips are 35° and of the discharging tips 20°. Find the power developed per pair of blades for a steam consumption of 2.5 kg/s, when the blade speed is 50 m/s. If the heat drop per pair is 10.04 kJ/kg, find the efficiency of the pair.
7 M
Answer any two question from Q3 (a), (b) or Q3 (c), (d)
3 (a)
Draw the diagrammatic arrangement of velocity compounded impulse turbine. Also write merits and demerits of velocity compounding of it.
7 M
3 (b)
Derive condition of maximum blade efficiency in case of 50% reaction turbine.
7 M
3 (c)
Explain working of Back pressure turbine with figure. Also give its economic assessment.
7 M
3 (d)
Describe various requirements of a typical combustion chamber of the gas turbine plant.
7 M
Answer any two question from Q4 (a), (b), (c) or Q4 (d), (e), (f)
4 (a)
Explain Thrust, Thrust Power and Propulsive Power in context to jet propulsion.
7 M
4 (b)
A gas turbine installations works on Brayton cycle between the temperature limits of 35°C and 715°C. For the maximum work to be developed, calculate temperature at the end of compression, pressure ratio and thermal efficiency.
7 M
4 (c)
Explain different methods to improve the thermal efficiency of a Gas Turbine plant with T-s diagram.
7 M
4 (d)
A turbojet engine propels at a speed of 880 km/hr and draws air at the rate of 50 kg/s. isentropic enthalpy drop in the nozzle is 190 kJ/kg and its velocity coefficient is 0.96. Fuel air ratio used is 0.010. The C.V. of fuel used is 46000 kJ/kg and the combustion efficiency is 95 %. Find Thrust, Thrust Power, Thrust SFC and Propulsive Power.
7 M
Answer any two question from Q5 (a), (b) or Q5 (c), (d)
5 (a)
List different methods of governing of steam turbines. Explain any one of them.
7 M
5 (b)
Derive equation for maximum mass flow rate of steam through nozzle.
7 M
5 (c)
Draw schematic diagram of Pulse Jet. Also write merits and demerits of it.
7 M
5 (d)
Explain construction and working of typical combined cycle power plant with figure.
7 M
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