Rajasthan Technical University 2010 B.Tech Mechanical Engineering Stream Turbines & Steam power plants - Question Paper
Rajasthan tech. University
B.tech seven sem (Main)
January 2010
Stream Turbines & Steam power plants
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ToM : | 2 | | |
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7E4063 | ||
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B.TacK.(Sm.VI)(IMEiaMinilion,Jam)iry*201d | |
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Machanical Cnginawing | ||
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(7MC4 SmTUiWw 4 tU>m Naw Wwf) | ||
Tim* r 3 Hours] [Total Marfcs: 00
(Min. Paaaing Warts: 34
Attempt overall the queston*. AM tjueehont cerry fwaf marks. (Schematic diagrams must be shown iiftwwr necessary. Any data you tael missing may suitably be assumed and sped dearly Units of Quantities used/calculated must be stated dearly.)
Use of fodowtng supporting material is permitted during examination.
(Mentioned in form No. 205)
1. Stm Tables 4 Hottler diagram 2._NH--_
1 What is the need .of compounding of impulse turbines? Explain velocity and pressure compounding. Show that in a 2-row velocity compounding, the ratio of work done by first row and second row is 3 : 1.
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1 What do you understand by term reaction? Define degree of reaction and derive the following expression for maximum efficiency in 50% reaction turbine..
_ Zcos2 a, l+cosJa,
where a, is nozzle angle at inlet. 16
2 With the help of diagram explain throttle governing.* Show tha't throttling losses increase with drop in pressure in throttle valve, also discuss the reduction in throttling loss in nozzle governing.
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7E4063) iimiraniu 1 (Contd...
2 Compare steam to blade speed ratio, maximum efficiency, enthalpy drop in a stage for simple impulse, 2-row cartis and 50% reaction turbine. Discuss the length of rotor or no. of stages and diameter of rotor for same output by the above three turbines.
3 Explain ideal regenerative feed heating cycle. Show that the efficiency of this cycle is equal to carnot cycle operating betwrrn same temperature reservoirs. Why this cycle is not being used in practice ? Draw T-S diagram for this cycle.
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3 Steam at* 150 bar and 550C enters into a steam turbine. After expansion to 45 bar. the steam is reheated to 550C and sent to another turKine. Two open heaters are placed optimally. The
condenser pressure is 0.1 bar. Determine efficiency.
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4 With the help of diagram explain mixed pressure turbine and derive expression for its efficiency.
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4 Explain the criterion used for selection of site for a coal based power plant and a hydro power plant.
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7E4063] igRfflfMlimiV 2 r 25.00 1
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