STUPIDSID
1(a)
Draw general layout mentioning essential components of hydro power plant. Explain the function of each components.
7 M
1(b)
Classify the Hydro-Electric power plants according to availability of head, quantity of water and nature of load.
7 M
2(a)
A Pelton wheel is to be designed for the following specifications:
Power = 9560 kW, Head =350m, Speed =750 rpm, Overall efficiency =85 % and Jet ratio =6. Determine (i) The wheel diameter (ii) Diameter of Jet (iii) The number of Jets required. Take C v =0.985& speed ratio K u = 0.45.
Power = 9560 kW, Head =350m, Speed =750 rpm, Overall efficiency =85 % and Jet ratio =6. Determine (i) The wheel diameter (ii) Diameter of Jet (iii) The number of Jets required. Take C v =0.985& speed ratio K u = 0.45.
7 M
Solved any one question from Q.2(b) & Q.2(c)
2(b)
Explain necessity of governing of hydraulic turbine. Describe governing of Francis turbine with neat sketch.
7 M
2(c)
Explain the function of Draft tube. State and sketch types of Draft tube and explain the importance of cone angle in Draft tube.
7 M
Solved any one question from Q.3 & Q.4
3(a)
Derive expression for minimum speed for starting a centrifugal pump.
7 M
3(b)
The impeller of a centrifugal pump has an external diameter of 450 mm and internal diameter of 200 mm and it runs at 1440 rpm. Assuming a constant flow
velocity through the impeller at 2.5 m/s and that the vanes at the exit are set back at angle of 25 ° . Determine (i) Inlet vane angle (ii) The angle, absolute velocity of water makes with the tangent at the exit and (iii) The work done per unit weight of water.
7 M
4(a)
What is cavitation? What are its causes? How it can be prevented in centrifugal pump.
7 M
4(b)1
Define and derive specific speed relation for pump.
3 M
Solved any one question from Q.5 & Q.6
4(b)2
Model power P = 30 kW, Head H = 8m and speed N = 1000 rpm. If the
prototype pump has to work against a head of 25 m, Calculate the speed, the power required and ratio of flow rates handled by the two pumps. Model to prototype scale ratio is 1/5.
4 M
5(a)
Explain the effect of Pre-whirl in centrifugal compressor. State types of impeller vanes used in centrifugal compressor and show their characteristic curves.
7 M
5(b)
A centrifugal compressor running at 12000 rpm delivers 1.3 m 3 /s of free air. 07
The pressure and temperature at inlet are 1 bar and 25 ° C. The compression ratio
is 5, blades are radial at outlet, the velocity of flow is 58 m/s and is constant
throughout. Assume slip factor is 0.9 and isentropic efficiency is 84 % . Determine (i) temperature of air at outlet, (ii) impeller diameter and blade angle at inlet and (iii) power required. Assume inlet diameter of impeller half of outlet diameter of impeller.
7 M
6(a)
Explain phenomenon of surging and choking in centrifugal compressor with neat sketch.
7 M
Solved any one question from Q.7 & Q.8
6(b)
Explain in detail working of a Scroll compressor with neat sketch.
7 M
7(a)1
Draw stage velocity diagram of an axial flow compressor.
3 M
7(a)2
Give comparison between axial flow and centrifugal compressor.
4 M
7(b)
Explain with the help of a neat sketch the principle and operation of
(i) Differential hydraulic accumulator and (ii) Fluid coupling.
(i) Differential hydraulic accumulator and (ii) Fluid coupling.
7 M
8(a)
A single acting single cylinder reciprocating air compressor is driven by 25 kW electric motor. It takes air at 1.013 bar and 18 ° C and delivers it at 8 bar.
Compressor runs at 300 RPM. The index of compression and expansion is 1.32 and the clearance volume is 6 % of the swept volume. Assuming the mechanical efficiency as 85 % and bore is equal to stroke, calculate the free air delivery in m 3 /min, the volumetric efficiency and the bore and stroke of the compressor.
7 M
8(b)
Explain with the help of a neat sketch the principle and operation of
(i) Hydraulic ram and (ii) Hydraulic intensifier.
(i) Hydraulic ram and (ii) Hydraulic intensifier.
7 M
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