Anna University,Chennai Nov/Dec 2012 Examinations
Rejinpaul.com Important Questions
Mechanics of Fluids CE2202Â
UNIT I-V
1.    What are the different types of fluids? Explain each type
2.    State Newton’s law of viscosity and also define the coefficient of viscosity.
3.    An oil film of thickness 1.5 mm is used for lubrication between a square plate ofsize 0.9m *0.9m and an inclined plane having an angle of inclination 200 .The weight of square plate is 392.4 N and its slides down the plane with a uniform velocity of 0.2 m/s. find the dynamic viscosity of the oil.?
4.    A U-tube differential manometer is connected two pressure pipes A and B. Pipe A contains Carbon tetrachloride having a specific gravity 1.594 under a  pressure of 11.772N/ Cm2 and pipe B contain oil of specific gravity 0.8 under pressure 11.72 N/ Cm2 . The pipe A lies 2.5 m above pipe B. Find the difference of pressure measured by mercury as a fluid filling U-tube
5.    A horizontal pipe of 400 mm diameter is suddenly contracted to a diameter of  200 mm. The pressure intensities in the large and small pipe is given as 15  N/cm² and 10 N/cm² respectively. Find the loss of head due to contraction, if Cc=0.62, determine also the rate of flow of water
6.    Obtain an expression for Hagen- Poisulle flow. Deduce the condition of maximum velocity The rate of flow of water through a horizontal pipe is 0.3 m³/s. The diameter of the pipe is suddenly enlarged from 25 cm to 50 cm. The pressure intensity in the smaller pipe is 14N/m². Determine (i) Loss of head due to sudden enlargement. (ii)Pressure intensity in the large pipe and iii)Power lost due to enlargement.
7.     A pipe line carrying oil of specific gravity 0.85, changes in diameter from 350 mm at position 1 to 550 mm diameter to a position 2, which is at 6 m at a higher level. If the pressure at position 1 and 2 are taken as 20 N/cm2 and 15 N/ cm2 respectively and discharge through the pipe is 0.2 m³/s. determine the loss of head.
8.    Derive continuity equation o f differential form. Discuss whether the equation is valid for a steady or unsteady flow, viscous or in viscid flow, compressible or incompressible flow
9.    State the Bernoulli’s  theorem for steady flow  of an  incompressible fluid. Derive
an expression for Bernoulli’s equation
10.A pipe line carrying oil of specific gravity 0.87, changes in diameter from 200 mm
diameter at a position A to 500 mm diameter at a position B which is 4 meters at a higher level. If the pressure at A and B which is 4 m at a higher level. If the pressures at A and B are 9.81 N/Cm 2 and 5.886 N/Cm2 respectively and the  discharge is 20 litres/s determine the loss of head and direction of flow
11.Water is flowing through a pipe having diameter 300 mm and 200 mm at the bottom
end is 24.525 N/cm2Â Â and the pressure at the upper end is 9.81 N/Cm2 . Determine the difference in datum head if the rate of flow through pipe is 40 lit/s
12.Obtain en expression for the work done per second by water on the runner of a â€"pelton wheel. Hence derive an expression for maximum efficiency of the pelton wheel giving the relationship between the jet speed and bucket speed
13.The Nozzle of a pelton Wheel gives a jet of 9 cm diameter and velocity 75 m/s.  Coefficient of velocity is 0.978. The pitch circle diameter is 1.5 m and the deflection angle of the bucket is 170º. The wheel velocity is 0.46 times the jet velocity. Estimate the speed of the pelton wheel turbine in rpm, theoretical power developed and also the efficiency of the turbine
14.A pelton turbine is required to develop 9000 KW when working under a head of  300 m the impeller may rotate at 500 rpm. Assuming a jet ratio of 10 And an  overall efficiency of 85% calculate (1) Quantity of water required. (2) Diameter of  the wheel (3) Number of jets (4) Number and size of the bucket vanes on the runner
15.Draw a neat sketch of centrifugal pump and explain the working principle of the centrifugal
Pump
16.Draw a neat sketch of Reciprocating pump and explain the working principle of single acing and double acting Reciprocating pump.
17.Write short notes on the following (1) Cavitations in hydraulic machines their causes, effects and remedies. (2) Type of rotary pumps
18.The diameter and stroke of a single acting reciprocating pump are 200 mm and 400 mm respectively, the pump runs at 60 rpm and lifts 12 liters of water per second through a height of 25 m. The delivery pipe is 20m long and 150mm in diameter. Find (i) Theoretical power required to run the pump. (ii) Percentage of slip. (iii) Acceleration head at the beginning and middle of the delivery stroke
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