DEPARTMENT OF MECHANICAL ENGINEERING
INTERNAL TEST – I
th
Semester: 6
Session: Feb- June 2022
Course Name: Turbomachines
Course Code: 1 8 M E 6 1
Date: 18.04.2022
Max Marks: 45
Time: 9.30 am to 11.00 am
Duration: 90 minutes
Note: Answer all questions as per choice. Each question carries 15 Marks.
Q#
Questions
a
1.
b
a
2.
b
a
3.
b
a
4.
5.
6.
b
a
b
a
(15×3 = 45 Marks)
Classify the various types of Turbomachine. Differentiate between
turbomachines and positive displacement machines.
With a neat sketch explain the working principle of a Turbomachine.
OR
Describe the effect of Reynolds number on turbomachines with a neat
sketch.
Define the following terms with equations: a) Unit speed, b) Unit
Discharge, c) Unit Power and d) Specific speed
Four turbines of specific speed 890 (metric) each is installed in a
hydel station each of turbine runs at 60 rpm and share equally a total
discharge of 280 m3/s available under a head of 1.73 meter. Assuming
each turbine as an efficiency of 82.5%. Find the power of each turbine
in kW.
One fifth scale model of a pump was tested in a laboratory at 1200
rpm. The head developed and the power input at the best efficiency
point were found to be 8 meters at 32 kW, respectively. If the Prototype
Pump has to work against a head of 25 meter, determine its working
speed, the power required to drive it and the ratio of the flow rates
handled by the two pumps
OR
Write the first law of thermodynamics equation for a turbomachine and
explain it with a neat sketch.
Performance of a turbomachine depends on the variables discharge
(Q), speed (N), rotar diameter (D), energy per unit mass flow (gH),
power (P), density of fluid (ρ), dynamic viscosity of fluid (μ). Using
the dimensional analysis obtain the π-terms.
Explain the degree of reaction with suitable equations
With usual notations and velocity triangles derive the Alternative form
of Euler Turbine Equation and identify the components of energy
transfer.
OR
Sketch velocity diagrams for R=0 & R=0.5 and label.
Marks
CO’s
Bloom’s
Level
7
1
L2
8
1
L2
7
1
L2
8
1
L2
7
2
L3
8
2
L3
7
2
L3
8
2
L3
5
2
L3
10
2
L3
5
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b
Air enters in an axial flow turbine with a tangential component of the
absolute velocity equal to 600 m/s in the direction of rotation. At the
rotor exit, the tangential component of the absolute velocity is 100 m/s
in a direction opposite to that of rotational speed. The tangential blade
speed is 250 m/s. evaluate
i) The changes in total enthalpy of air between the inlet and outlet of
the rotor.
ii) The power in kW if the mass flow rate is 10 kg/s
iii) The change in total temperature across the rotor.
10
2
L3
Course Outcomes:
CO 1. Understand the basics of turbomachinery and to identify the various types of Turbomachinery and its operations.
CO 2. Analyze the energy exchange process in turbomachines.
CO 3. Calculate the performance of radial flow compressor and pump.
CO 4. Perform the characteristics studies of centrifugal pump.
CO 5. Analyze the energy conversion efficiencies of hydraulic turbines.
CO 6. Solve practical problems related to hydraulic machines.
Programme Outcome (POs)
PO-1: Knowledge, PO-2: Analyze, PO-3: Design, PO-4: Conduct, PO-5: Tools, PO-6: Societal Problems,
PO-7: Sustainability, PO-8: Team work and leadership qualities, PO-9: Ethics, PO-10: Communication,
PO-11: Project and finance management, PO-12: Life time Learning
CO/PO: Mapping
(3/2/1 indicates strength of correlation) 3-High, 2-Medium, 1-Low
(POs)
(COs)
PO1 PO2 PO3 PO4 PO5 PO6
PO7 PO8 PO9
PO10 PO11 PO12
CO1
CO2
CO3
CO4
CO5
CO6
3
3
3
3
3
3
2
3
3
2
3
3
L1
Remembering
1
2
3
2
3
2
1
2
3
2
2
3
L2
Understanding
L3
L4
Applying
Analyzing
L5
Evaluating
L6
Creating
*---------All the Best---------*
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