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APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
THIRD SEMESTER B.TECH DEGREE EXAMINATION, DECEMBER 2017
Course Code: ME200
Course Name: FLUID MECHANICS AND MACHINERY (IE, PE, MP, AN, AU)

Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any three questions, each carries 10 marks.
1 2) Explain gauge, absolute, and vacuum pressure. Show the relationship between (2)
them.
b) With neat sketch explain the types of fluids. (3)
c) A vertical gap 2.2 cm wide of infinite extent contains a fluid of viscosity 2Ns/m? (5)
and specific gravity 0.9. A metallic plate 1.2m x 1.2m x 0.2cm is to be lifted up
with a constant velocity of 0.15m/sec, through the gap. If the plate is in the middle
of the gap, find the force required. The weight of the plate is 40N.

2 ஐ Definethe following terms : (4)
i) compressibility and bulk modulus 1) vapour pressure
iii) kinematic viscosity iv) specific gravity

b) The dynamic viscosity of an oil, used for lubrication between a shaft and sleeve is (6)
6poise. The shaft is of diameter 0.4m and rotates at 190 r.p.m. Calculate the
power lost in the bearing for a sleeve length of 90mm. the thickness of the oil film
is 1.5mm.

3 a) With neat sketch explain types of equilibrium of floating and submerged bodies. (4)

b) A solid cylinder of diameter 4 m has a height of 3 m. Find the meta-centric height
of the cylinder when it is floating in water with its axis vertical. The specific

gravity of the cylinder = 0.6. State whether it is stable or unstable equilibrium. (6)
4 a) Derive an expression for the force exerted on ೩ sub-merged vertical plane surface
by the static liquid and locate the position of centre of pressure. (4)

b) A rectangular plane surface 2m wide and 3m deep lies in water in such a way that
its plane makes an angle 30° with the free surface of water. Determine the total (6)
pressure and position of center of pressure when the upper edge is 1.5m below the
free water surface.
PART B
Answer any three questions, each carries 10 marks.
5 9) The velocity potential function (©) is given by an expression (5)

(0) = — - + ‏ترج ماگ‎
(a) Find the velocity component in x and y direction.
(b) Show that (©) represents a possible case of flow.
b) Derive the expression for continuity equation in three dimensional flow. (5)
6 2) 1) ^ pipe of diameter 300mm and length 3500m is used for the transmission of
power by water. The total head at the inlet of the pipe is 500m. Find the maximum
power available at the out let of the pipe, if the value of / 6 (5)
b) Derive the expression for power transmission through pipes and prove that

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