Download PTU (I.K.Gujral Punjab Technical University (IKGPTU)) B-Tech (Bachelor of Technology) Mechanical Engineering 2020 December 4th Sem 77547 Fluid Machines Previous Question Paper
Total No. of Pages : 02
Total No. of Questions : 18
B.Tech (ME) (2018 Batch) (Sem.?4)
FLUID MACHINES
Subject Code : BTME-402-18
M.Code : 77547
Time : 3 Hrs. Max. Marks : 60
INST RUCT IONS T O CANDIDAT ES :
1 .
SECT ION-A is COMPU LSORY cons isting of T EN Multip le Cho ic e question s
carry ing T WO marks each.
2 .
SECT ION-B c ontains F IVE questions c arrying FIVE marks eac h and s tud ents
have to atte mpt any FOUR q ues tions.
3 .
SECT ION-C contains THREE questions carrying T EN marks e ach and s tudents
have to atte mpt any T WO questio ns.
SECTION-A
Write briefly :
Q1. What is the meaning of degree of reaction?
Q2. What is draft tube?
Q3. What is need of priming of a pump?
Q4. What is effect of cavitation?
Q5. What is scale effect?
Q6. What is fluid coupling?
Q7. What do you understand by governing of a Pelton turbine?
Q8. Define Negative Slip in reciprocating pump.
Q9. What is hydraulic accumulator?
Q10. What are vane pumps?
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SECTION-B
Q11. A turbine is to operate under a head of 25 m at 200 r.p.m. The discharge is 9 m3/s. If the
overall efficiency is 90 percent. Determine :
a) Power generated
b) Specific speed of the turbine
c) Type of turbine.
Q12. With the aid of a sketch explain the working of a Hydraulic Accumulator.
Q13. Derive the expression for maximum hydraulic efficiency of a Pelton wheel.
Q14. Explain why the suction lift of a pump cannot exceed certain limit?
Q15. The impeller of a centrifugal pump is 1m in diameter and rotates at 1500 rpm. The blades
are curved backward and make an angle of 30? to the tangent at the periphery. Calculate the
power required if the velocity of the flow at outlet is 20m/s. Determine the head to which
water can be lifted when a diffuser casing reduces the outlet velocity to 60%.
SECTION-C
Q16. Derive expression for the force exerted by the jet of water on a series moving flat plate
placed on the periphery of a wheel. Also find the maximum efficiency?
Q17. A Pelton turbine is required to produce 6MW power when working under a head of 300m.
The turbine r.p.m. is 550 and the overall efficiency is 0.85. The turbine works with three
jets. Determine :
a) The diameter of the runner
b) Discharge per second
c) Diameter of the jet
d) Number of buckets.
Q18. Explain the principle of operation, construction and working of a centrifugal compressor
with necessary sketches.
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on
any page of Answer Sheet will lead to UMC against the Student.
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This post was last modified on 13 February 2021