# PTU B.Tech Marine Engineering 6th Semester May 2019 72851 FLUID MACHINERY Question Papers

PTU Punjab Technical University B-Tech May 2019 Question Papers 6th Semester Marine Engineering

Roll No.
Total No. of Pages : 02
Total No. of Questions : 09
B.Tech. (Marine Engg.) (2013 Batch) (Sem.?6)
FLUID MACHINERY
Subject Code : BTME-603
M.Code : 72851
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1.
SECTION-A is COMPULSORY consisting of TEN questions carrying T WO marks
each.
2.
SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt ANY FOUR questions.
3.
SECTION-C contains T HREE questions carrying T EN marks each and students
have to attempt ANY T WO questions.

SECTION-A

a. What are the advantages of multistage pumps?

b. Why the vanes are made curved?

c. What is function of surge tank?

d. What is cavitation?

e. What are the basic components of a turbomachine?

f. Why the number of blades in Kaplan turbine is less?

g. How is the number of buckets decided in a Pelton turbine?

i. Make an inlet velocity triangle for Pelton wheel.

j. Explain impulse momentum principle.

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SECTION-B
Q2. Derive expression for model relationships in case of centrifugal pump.
Q3. Show from the first principles that work saved in a single- acting reciprocating pump by
fitting an air vessel is 84.8 per cent.
Q4. Explain multistage pumps. What are the advantages of multistage pumps?
Q5. What is governing and how it is accomplished for different types of turbine?
Q6. State and explain Euler's equation for energy transfer in a turbomachine and energy
transfer in terms of fluid and rotor kinetic energy changes.

SECTION-C
Q7. Discuss the phenomenon of cavitation in reaction turbines. How we can reduce
cavitation? Discuss with the help of Thoma's Cavitation factor.
Q8. A 4-stage centrifugal pump supplying water is to be designed for a total lift of 120 m
when running at 1450 rpm ; its discharge under these conditions is 0.24 m3/s . The vanes
are set back at an angle of 30? with the tangent to the wheel at outlet and the impeller is
surrounded by guide vanes. The water enters the vane passage in a radial direction, the
velocity of flow through the impeller is 0.3 of the outlet peripheral velocity and the losses
in the pump amount to one-third of the velocity head at discharge from the impeller. Find
the diameter and width of impeller at outlet the monometric efficiency and the angle of
the guide vanes.
Q9. A Kaplan turbine operating under a head of 7.5 m develops 1835 kW with an overall
efficiency of 87%. The turbine is set 2.5 m above the tail water level and vacuum gauge
inserted at turbine outlet records a suction head of 3.15 m. Calculate the efficiency of 3 m
and the loss of head due to friction in the draft tube equals 25% of kinetic at outlet.

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