Turbomachinery SPPU Endsem Question Paper May 2023
All 8 questions from this SPPU endsem paper, as printed. Read them here or open the PDF.
- Subject code
- 402043
- Pattern
- 2019 pattern
- Exam
- Endsem
- Session
- May 2023
- Max. marks
- 50
- Time
- 2 Hours
- Paper code
- [6004]-721
Printed for: B.E. (Mechanical) (Semester - VII)
Instructions to the candidates
- Answer Q.1 or Q.2, Q.3 or Q.4, Q.5 or Q.6, Q.7or Q.8.
- Neat diagrams must be drawn wherever necessary.
- Figures to the right of each question indicate full marks.
- Assume suitable data wherever necessary and mention the same clearly.
- Use of steam tables, Mollier chart and calculator is allowed.
Questions
Q1
- a)[6]
Sketch Pelton wheel bucket and explain the effect of its size, shape and number on its function.
- b)[8]
The external and internal diameters of an inward flow reaction turbine are 2m and lm respectively. The head on the turbine is 65 m. the width of the vane at inlet and outlet are same and equal to 0.25 m. The runner vanes are radial at inlet and discharge is radial at outlet. The speed is 220 rpm and the discharge is 6 m 3 /sec. Determine : i) The vane angle at outlet of the runner and guide blade angle at inlet. ii) The hydraulic efficiency.
OR- a)
Q2
- a)[6]
Explain the following terms. i) Specific speed ii) Run away speed iii) Degree of reaction 2
- b)[8]
This part has equations that don’t show as text. Open the PDF to read it.
- a)
Q3
- a)[5]
What is compounding of steam turbine? Explain any one of the following. i) Velocity compounding ii) Pressure compounding
- b)[7]
Steam enters an impulse wheel having a nozzle angle of 20 º at a velocity of 450 m/s. The exit angle of moving blades is 20 º and relative velocity of steam may be assumed to remain constant over the moving blades. If the blade speed is 185 m/s, determine: i) Blade angle at inlet ii) Work done/kg of steam iii) Power developed when the turbine is supplied with 1.8 kg/s of steam iv) Diagram efficiency
OR- a)
Q4
- a)[5]
Show that for Parson ’ s Reaction turbine, the degree of reaction is 50%.
- b)[7]
Following data refer to the single row of impulse steam turbine mean diameter of the blade ring = 1.1 m, Speed = 3000rpm, Nozzle 3 angle = 17deg., ratio of blade velocity to the steam velocity = 0.45, blade friction factor = 0.82, Blade angle at exit is less by 3 deg to that at inlet, steam mass flow rate = 10.2 kg/s. Draw a velocity diagram and find the following. i) Blade angles at inlet and outlet ii) Tangential force iii) Axial force iv) Power developed.
Also asked:May 2024
- a)
Q5
- a)[4]
Explain NPSH in centrifugal pump.
Also asked:Nov 2023
- b)[8]
A Centrifugal pump running at 950 rpm is working against a head 20 m. The external diameter of the impeller is 460 mm and outlet width is 50 mm. If the vane angles at outlet is 40 ° and manometric efficiency is 75 %. Determine the following : i) Flow velocity at outlet ii) Absolute velocity of water leaving the vane iii) Angle made by the absolute at outlet with the direction of motion at outlet iv) Rate of flow through the pump v) Specific speed.
OR- a)
Q6
- a)[4]
- b)[8]
A Centrifugal pump having outer diameter equal to two times inner diameter and running at 1250 rpm works against a total head of 80 m.The velocity of flow through the impeller is constant and is equal to 3 m/s. 4 The vanes are set back at width at an angle of 30 º at outlet. If the outer diameter of the impeller is 600 mm and width at outlet is 50 mm. Determine the following: i) Vane angle at inlet ii) Work done per second by iii) Manometric efficiency
Q7
- a)[4]
Differentiate between centrifugal compressor and axial flow compressor.
- b)[8]
Air at a temperature of 300 K flows in a centrifugal compressor running at 18500 rpm. The other data is given as follows : i) Isentropic total head efficiency = 75% ii) The temperature rise of air passing through the compressor iii) The static pressure ratio Assume that the absolute velocities of air at inlet and exit of compressor are same. Take Cp = 1.005 kJ/kg K.
OR- a)
Q8
- a)[4]
Explain Construction and working of centrifugal compressor with neat diagram.
Also asked:May 2024
- b)[8]
The impeller of the centrifugal compressor has the inlet and outlet diameter of 0.3 and 0.6 m respectively. The intake is from the atmosphere at 100 kPa and 300 K, without any whirl component. The outlet blade speed is 11000 rpm and velocity of flow is constant at 125 m/s. If the blade width at inlet is 6 cm, determine the following : i) Specific work ii) Exit pressure iii) Mass flow rate iv) Power required to compressor if the overall efficiency is assumed to be 75%.
- a)