GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- V(OLD) EXAMINATION - SUMMER 2019
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Subject Code:151903 Date:31/05/2019
Subject Name:Fluid Power Engineering
Time:02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
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2. Make suitable assumptions wherever necessary.3. Figures to the right indicate full marks.
Q.1 (a) Derive an expression of power transmission through pipe. Also find condition for maximum power transmission and corresponding efficiency of transmission. [07]
(b) Derive Darcy- Weisbach formula for head loss due to friction in pipe flow. [07]
Q.2 (a) Show that the efficiency of a free jet striking normally on a series of flat plates mounted on the periphery of a wheel can never exceed 50%. [07]
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(b) Write brief note on hydraulic ram. [07]OR
(b) Prove that the efficiency of propulsion when the inlet orifices face the direction of motion of the ship is given by
2u / (V+2u) [07]
Q.3 (a) What is degree of reaction? Prove that for Francis turbine degree of reaction is 50%. [07]
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(b) The following data relates to a Pelton wheel turbine [07](1) Head of base of nozzle=75m
(i1) speed of the wheel = 250 rpm
(ii1) speed ratio =0.46
(iv) Power at the shaft=120 kw
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(v) Coefficient of velocity = 0.98(vi) Overall efficiency =86%. Design the Pelton wheel to find the wheel diameter, diameter of jet, size of buckets and number of buckets on the wheel.
OR
Q.3 (a) Write short note on: [07]
(1) Priming in centrifugal pump
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(i) Pre-whirl in centrifugal compressor(b) Explain the governing of Kaplan turbine with neat sketch. [07]
Q.4 (a) Define specific speed of pump. Derive an expression for specific speed for centrifugal Pump. [07]
(b) A single acting reciprocating pump, running at 60 rpm delivers 0.54 m3 of water per minute. The diameter of the piston is 200mm and stroke length 300mm. the suction and delivery heads are 4m and 12m respectively. Determine: (i) Theoretical discharge, (i1) co-efficient of discharge, (iii) percentage slip of pump, (iv) power required to drive the pump. [07]
OR
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Q.4 (a) Derive an expression of work done per cycle for reciprocating compressor by considering clearance volume. [07]
(b) A centrifugal compressor delivers 16 kg/sec of air with a total head pressure ratio of 4:1, when running at 15000 rpm. Inlet total head temperature is 25°C, slip factor 0.9, power input factor 1.04 and isentropic efficiency 82%, calculate: (i) Outlet diameter of the impeller, (i1) Power input. Take Cp = 1.005 kJ/kgK. [07]
Q.5 (a) With neat sketch explain construction and working of hydraulic intensifier [07]
(b) Explain following terms: Draftube, Cavitation and Air vessel [07]
OR
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Q.5 (a) With neat sketch explain construction and working of hydraulic intensifier [07]
(b) Explain the phenomenon of surging and stalling in an axial flow compressor [07]
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