Download PTU B.Tech 2020 March ME 6th Sem Fluid Machinery Question Paper

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Roll No. Total No. of Pages : 02

Total No. of Questions : 09

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B.Tech. (Marine Engg.) (2013 Onwards) (Sem.-6)

FLUID MACHINERY

Subject Code : BTME-603

M.Code : 72851

Time : 3 Hrs. Max. Marks : 60

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INSTRUCTIONS TO CANDIDATES :

1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt ANY FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt ANY TWO questions.

SECTION-A

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1. Answer briefly :
   1. How turbo-machines are classified?
   2. What do you understand by mixed flow pump?
   3. What is a draft tube?
   4. Name different priming device.
   5. Explain cavitation.

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   6. Define specific speed of a turbine.
   7. Define degree of reaction.
   8. What is negative-slip?
   9. What is priming of a centrifugal pump?
   10. What is the function of a hydraulic accumulator?

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SECTION-B

2. A 75 mm diameter water jet having a velocity of 12 m/s impinges on a plane smooth plate at an angle of 60° to the normal to the plate. What will be the impact when
   1. The plate is stationary and
   2. The plate is moving in the direction of the jet at 6 m/s? Estimate the work done per unit time by the jet on the plate in each case. Take the density of water as 998 kg/m³.

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3. Discuss the function and brief description of commonly used surge tanks.
4. A centrifugal pump having impeller diameter of 1 m has backward curved vanes which make an angle of 25° with the wheel tangent at the blade tip. At the operational speed of 1440 r.p.m, the radial velocity of flow at the tip is 10 m/s and the slip coefficient is 0.85. Determine
   1. Actual work input/ kg of water flow
   2. Absolute velocity of fluid at the impeller tip
   3. Hydraulic efficiency considering that kinetic energy at the outlet is wasted.

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5. Discuss in general the main and operating characteristics of a centrifugal pump.
6. A single acting reciprocating pump has a plunger diameter 20 cm and the stroke length 30 cm. It draws water from a sump 3.5 m below the centre of pump cylinder. Find the least diameter of suction pipe if it is 6 m long. The pump runs at 50 rpm with simple harmonic motion and separation occurs at 2.5 m of water absolute pressure. Barometric pressure = 10.3 m of water.

SECTION-C

8. A reaction turbine works at 450 r.p.m under a heads of 120 m. Its diameter at inlet is 120 cm and the flow area is 0.4 m². The angles made by the absolute and relative velocities at inlet are 20° and 60° respectively with the tangential velocity. Determine
   1. The volume flow rate
   2. The hydraulic power developed

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   3. The efficiency
   Assume whirl at outlet to be zero.
9. Explain the function of air vessel fitted to suction and delivery pipes of a reciprocating pump.
10. Write a note on Hydraulic intensifier.

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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