Fluid Mechanics and Fluid Power Model Question Paper : www.nptc.ac.in Nachimuthu Polytechnic College

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8203 FLUID MECHANICS & FLUID POWER
Model Question Paper

NOTE : 1. Answer all questions . Choosing any one from Part - A (5marks) and one from Part - B (10marks)
2. All Questions carry equal marks.
I. A i) Explain the following properties of the fluid and state their units.
(a) Density (b) specific weight (c) specific gravity
ii) Describe the working of a bourdon tube pressure gauge.
B i) A circular ring of 2.5m external and 1.5 m internal diameters is vertically immersed in water such that the center of the plate is 3.6 m deep from the free surface of water. Determine the total pressure and depth of the center of pressure.

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ii) A left limb of an U – tube manometer is opened to atmosphere and right limb is connected to the pipe carrying water pressure. The center of the pipe is at the level of free surface of mercury. Find the difference in the level of mercury in the limbs, if the absolute pressure of water in the pipe is 15 m of water.

II. A i) Define hydraulics co efficient.
ii) Define hydraulic gradient line and wetted perimeter.
B i) State and prove Bernoulli’s theorem.
ii) A venturimeter of size 300 x 100 mm is fitted to the horizontal pipe. Mercury the manometer is connected to the venturimeter reads 100 mm. Find the discharge of through the pipe, if co efficient of venturimeter is 0.98

III. A i) Derive an expression for the force exerted by the jet on a moving flat plate
ii) Explain the function of following
(a) surge tank b) draft tube
B i) A jet of water 80 mm dia with a velocity of 15 m/sec and strikes a series of vanes moving with a velocity of 10 m/sec. Find (a) force exerted by the jet. (b) Work done by the jet.
ii) Explain with neat sketch the working principle of kaplan turbine.

IVA i) Explain any four common troubles in centrifugal pumps with their remedies
ii) Draw a neat sketch of piston type reciprocating pump and name its parts.
B i) Draw a neat sketch and illustrate the parts of a centrifugal pump and explain its working principle.
ii) A single reciprocating pump has a plunger diameter of 250 mm and a stroke of 350 mm .If the speed of the pump is 60 rpm and delivers 16.5 lps. Find (a) theoretical discharge (b) coefficient of discharge (c) slip and (d) percentage of slip.

V. A i) Write short notes on FRL unit..
ii) Explain with neat sketch the working of bladder type accumulator.
B i) Explain the working of 4/3 DC valve with neat sketch.
ii) Explain the working of an external gear pump with a neat sketch.