STUPIDSID
Solve any one question from Q.1(a,b) &Q.2(a,b)
1(a)
Prove that the force exerted by jet of water on semi-circular curve plate is two times the force exerted by the jet of water on the vertical plate.
4 M
1(b)
The mean velocity of the bucket of the Pelton wheel is 10 m/s. The jet supplies the water at 0.7 m3/s under the head of 30m The jet is deflected through an angle of 160° by the bucket. Find the Power developed by the Pelton wheel and Hydraulic efficiency. Take Cv = 0.98 & neglect the losses in the bucket.
6 M
2(a)
How do you classify water turbines? What is the difference between the impulse & reaction turbine?
4 M
2(b)
The external and internal diameters of an inward flow reaction turbine are 100 cm and 50 cm respectively. The head available is 45 m and velocity of the flow through the runner 3.5 m/s and it is constant. The guide vane angle at inlet is 10° and runner vanes are radial are inlet. Assuming the discharge at the outlet of the runner is radial,
Determine:-
i) Speed of the turbine
ii) Power developed
iii) Hydraulic Efficiency.
Determine:-
i) Speed of the turbine
ii) Power developed
iii) Hydraulic Efficiency.
6 M
Solve any one question from Q.3(a,b) &Q.4(a,b)
3(a)
Explain the necessity of draft tube in reaction turbines?
2 M
3(b)
Steam isuues from the nozzle of an impulse steam turbine with a velocity of 1200 m/s. The nozzle angle is 20° The mean blade speed is 400m/s and inlet & outlet angles of moving blades are equal. The mass of steam flowing through the turbine is 900 kg/hr. Assume friction factor = 0.8 Determine:
i) Blade angles
ii) Power developed
iii) Blade efficiency
i) Blade angles
ii) Power developed
iii) Blade efficiency
8 M
4(a)
Derive an expression of Specific speed of hydraulic turbines.
6 M
4(b)
Explain:
i) Blade efficiency
ii) Stage efficiency
i) Blade efficiency
ii) Stage efficiency
4 M
Solve any one question from Q.5(a,b,c) &Q.6(a,b)
5(a)
Explain the different types of casing used for centrifugal pump.
6 M
5(b)
Derive an expression of minimum starting speed of centrifugal pump.
6 M
5(c)
Discuss the influence of blade angle on the performance of centrifugal pump.
6 M
6(a)
An impeller of inside diameter 15 cm and outside diameter 40 cm having a width at inlet 4 cm and width at outlet 2 cm is running at 1440 rpm. The inlet and outlet blade angles are 25° and 15° respectively. The whirl velocity at inlet is zero. Determine:
i) Flow rate in LPM
ii) Power of impeller
iii) Absolute velocity at outlet.
i) Flow rate in LPM
ii) Power of impeller
iii) Absolute velocity at outlet.
10 M
6(b)
Write a short note on Priming & Cavitation of Centrifugal pump.
8 M
Solve any one question from Q.7(a,b) & Q.8(a,b)
7(a)
Represent and explain the process involved in a centrifugal compressor on (T-S) and Derive an expression for isentropic efficiency based on total values.
8 M
7(b)
Write a short note on Surging & Choking of Centrifugal compressor.
8 M
8(a)
Discuss the dimensionless parameters used to predict the performance of centrifugal compressor.
6 M
8(b)
A centrifugal compressor delivers 10m3/s of air when running at 9000 rpm. The air drawn at 1 bar and 300 k and delivered at 4 bars. The isentropic efficiency is 80% . Blades are radial at outlet and constant velocity of flow is 64 m/s. The outer diameter of impeller is twice the inner diameter and slip factor may be taken as 0.9. Determine:
i) Temperature of air at outlet
Power required to drive the compressor
iii) Impeller diameter at inlet & outlet
iv) Impeller blade angle at inlet
v) Diffuser blade angle at inlet
i) Temperature of air at outlet
Power required to drive the compressor
iii) Impeller diameter at inlet & outlet
iv) Impeller blade angle at inlet
v) Diffuser blade angle at inlet
10 M
Solve any one question from Q.9(a,b,c) & Q.10(a,b,c)
9(a)
Write a short note on:
i) Fan
ii) Blower
i) Fan
ii) Blower
4 M
9(b)
Explain the construction and working of an axial flow compressor.
6 M
9(c)
Define slip coefficient, work factor and pressure coefficient.
6 M
10(a)
Compare axial flow compressor & centrifugal compressor.
4 M
10(b)
Write a short note on losses in axial flow compressor.
4 M
10(c)
An axial compressor has a mean diameter of 60 cm and runs at 15000 rpm. If the actual temperature rise and pressure ratio developed are 30°C and 1.3 respectively, Determine:
i) Power required to drive the compressor while delivering 57 kg/s of air, assuming mechanical efficiency 86% and initial temperature of 35°C
ii) The degree of reaction if the temperature at rotor exit is 55°C
iii) Stage efficiency
i) Power required to drive the compressor while delivering 57 kg/s of air, assuming mechanical efficiency 86% and initial temperature of 35°C
ii) The degree of reaction if the temperature at rotor exit is 55°C
iii) Stage efficiency
8 M
More question papers from Turbo Machines