Dr. A.P.J. Abdul Kalam University

Bachelor of Engineering

Fourth Semester Main Examination, June-2021

Fluid Mechanics [CE405T]

Branch-Civil

Time: 3:00 Hrs Max Marks 70

Note : (i) Attempt any five questions.

(ii) All question carry equal marks.

Q.1 (a) Expalin Newton’s Law of Visocity?

(b) What are the type of Fluids?

Q.2 (a) State the Pascal’s Law & its Application?

(b) Distinguish Between Steady Flow and Unsteady Flow?

Q.3 (a) State the Bernoulli’s Equation of fluid flow? Find the Kinematic

Visocity of an oil having Density 981kg/m 3 The Shear Stress at a Point in oil is 0.2452N/m

and Velocity Gradient at that Point is 0.2 per second?

(b) The Velocity distribution for flow over a flat plate is given by u=3/4 y-y 2

in which u is the velocity in metre per second at a distance y metre above the plate. Determine the shear Stress at y=0.15m. Take a dynamic Visocity of fluid as 8.6 poise? by Chezy’s Formula?

Q.4 (a) Find the Velocity of Flow and rate of flow of Water through a

rectangular channel of 6m wide and 3m deep, when it is Running full.

the channel is having bed as 1 in 2000. Take chezy’s Constant c=55

(b) Find the discharge through a retangular channel of width 2m

having a bed slope of 4 in 8000. the Depth of flow is 1.5m and take

the value of N in Manning’s formula as 0.012?

Q.5 (a) The pressure outside the Droplet of water of Diameter 0.04m is

10.32N/cm2

(Atmospheric Pressure). Calculate the pressure within the

droplet if surface Tension is Given as 0.0725N/m of water?

(b) Explain Kinematic Visocity?

Q.6 (a) What are the properties of Fluid? Explain one, Two and Threedimensional Flow?

(b) A plate 0.025mm Distant from a fixed plate moves at 60cm/s and

Requires a force of 2N per unit Area i.e. 2N/m2 to maintain this

Speed. Determines the fluid Visocity Between the Plates?

Q.7 (a) What is Continuity Equation? Explain Rate of Flow or Discharge (Q)?

(b) Explain the terms Meta-Centre & Metacentric Height? Explain

Manometers?

Q.8 (a) Explain Mechanical Guages and Simple Manometers?

(b) Determine the total Pressure on a circular Plate of diameter 1.5m

which is placed Vertically in water in Such a way that the centre of

the plate is below the free surface of Water. Find the position of

Centre of Pressure also?

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