Download PTU B-Tech ME 2020 Dec 4th Sem 77547 Fluid Machines Question Paper

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Roll No.                                    Total No. of Pages : 02

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Total No. of Questions: 18

B.Tech (ME) (2018 Batch) (Sem.-4)

FLUID MACHINES

Subject Code: BTME-402-18

M.Code: 77547

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Time: 3 Hrs. Max. Marks : 60

INSTRUCTIONS TO CANDIDATES :

1. SECTION-A is COMPULSORY consisting of TEN Multiple Choice 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.

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SECTION-A

Write briefly :

1. What is the meaning of degree of reaction?
2. What is draft tube?
3. What is need of priming of a pump?

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4. What is effect of cavitation?
5. What is scale effect?
6. What is fluid coupling?
7. What do you understand by governing of a Pelton turbine?
8. Define Negative Slip in reciprocating pump.

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9. What is hydraulic accumulator?
10. What are vane pumps?

SECTION-B

11. 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 :
    1. Power generated
    2. Specific speed of the turbine

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    3. Type of turbine.
12. With the aid of a sketch explain the working of a Hydraulic Accumulator.
13. Derive the expression for maximum hydraulic efficiency of a Pelton wheel.
14. Explain why the suction lift of a pump cannot exceed certain limit?

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15. 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

16. 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?
17. 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 :
    1. The diameter of the runner
    2. Discharge per second

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    3. Diameter of the jet
    4. Number of buckets.
18. 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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