Turbomachinery SPPU Endsem Question Paper Nov 2024
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
- Nov 2024
- Max. marks
- 50
- Time
- 2 Hours
- Semester
- VII
- Paper code
- [6354]-614
Printed for: B.E. (Mechanical)
Instructions to the candidates
- Answer Q.1 or Q.2, Q.3 or Q.4, Q.5 or Q.6, Q.7 or Q.8.
- Neat diagram must be drawn wherever necessary.
- Figures to the right indicate full marks.
- Assume suitable data wherever necessary.
- Use of steam table/Mollier chart is allowed.
Questions
Q1
- a)[6]
Give classification of turbomachines with suitable example.
- b)[8]
A Pelton wheel is having a mean bucket diameter of 1 m and is running at 1000 rpm. The net head on pelton wheel is 700m. If the side clearance angle is 15º and discharge through the nozzle is 0.1 m 3 /s. Determine i) Power available at the nozzle. ii) Hydraulic efficiency of the turbine.
OR- a)
Q2
- a)[6]
Explain construction and working of Kaplan Turbine with neat sketch.
Also asked:Nov 2022
- b)[8]
The external and internal diameters of inward flow reaction turbines are 1.20 m and 0.6 m respectively. The head on the turbine is 22 m and velocity of flow through the runner is constant and equal to 2.5 m/s. The guide blade is given as 10° and runner vanes are radial at inlet. If the discharge at outlet is radial, determine i) The speed of the turbine ii) The vane angle at the outlet of the runner iii) Hydraulic efficiency of the turbine. 2
- a)
Q3
- a)[6]
What is compounding? Explain the need of compounding. Explain any one method of compounding in steam turbines.
Also asked:Nov 2023
- b)[6]
In De Laval turbine, steam is issued from the nozzle with a velocity of 1500 m/s whereas the mean blade velocity is 500m/s. The nozzle angle is 20° and the inlet and outlet angles of blades are equal. The mass of steam flowing through the turbine is at the rate of 1200kg/hr. Assuming blade velocity coefficient k=0.8, Draw velocity diagram and determine i) The Blade angles ii) The power developed by turbine iii) The Blade Efficiency
OR- a)
Q4
- a)[6]
Explain governing of steam turbine with any one method.
Also asked:Nov 2022
- b)[6]
In Parson’s reaction turbine running at 500rpm with 50% reaction develops 75 kW per kg per second of steam. The exit angle of blades is 20º and steam velocity is 1.5 times the blade velocity. Determine i) Blade Velocity ii) Inlet angle of moving blade.
- a)
Q5
- a)[6]
State & explain: i) Unit Speed ii) Unit Discharge iii) Unit Power
Also asked:Nov 2022
- b)[6]
The outer diameter of an impeller of a centrifugal pump is 400mm and outlet width is 50mm. The pump is running at 800 rpm and is working against a total head of 15 m. The vane angle at outlet is 40° and manometric efficiency is 75% Determine i) Velocity of flow at outlet iii) Velocity of water leaving the vane iii) Angle made by absolute velocity at outlet 3
Also asked:Nov 2023
OR- a)
Q6
- a)[6]
- b)[6]
A centrifugal pump delivers 1565 LPS against a manometric head of 6.1m. When the impeller rotates at 200 rpm. The impeller diameter is 1.22 m and area at outer periphery is 6450 cm 2 . If the vanes are set back at angle of 26° at the outlet , Determine i) Manometric Efficiency ii) Power required to drive the pump iii) Minimum starting speed if ratio of external to internal is 2.
Q7
- a)[4]
Explain Construction and working of axial flow compressor with a neat sketch.
- b)[8]
A rotary air compressor working between 1 bar and 2.5 bar has internal and external diameter of impeller as 300 mm and 600 mm respectively. The vane angle at inlet and outlet are 30° and 45° respectively. If air enters impeller at 15 m/s, Find i) Speed of impeller in rpm ii) Work done by compressor per kg of air.
OR- a)
Q8
- a)[4]
Differentiate between centrifugal compressor and axial flow compressor.
- 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 angle is 75°. The speed is 10000 rpm and velocity of flow is constant at 120 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 0.7.
- a)