# Dr. A.P.J. Abdul Kalam University BE IV SEM (ME) Fluid Mechanics [ME225T] June 2021 Question Paper

Dr. A.P.J. Abdul Kalam University

Bachelor of Engineering

Fourth Semester Main Examination, June-2021

Fluid Mechanics [ME225T]

Branch- ME

Time: 3:00 Hrs Max Marks 70

Note: (i) Attempt any five questions.

(ii) All question carry equal marks. Assume suitable data if necessary.

Q.1 (a) A wooden cylinder of specific gravity 0.6 and circular in cross-section is

required to float in oil(specific gravity 0.90).Find the L/D ratio for the cylinder

to float with it’s longitudinal axis vertical in oil. Find L/D ratio for the cylinder.

(b) An orifice meter with orifice diameter 10cm is inserted in a pipe of 20cm

diameter. The pressure gauges fitted upstream and downstream of the orifice

meter gives readings of 19.62 N/cm2 and 9.81N/cm2respectively.coefficient of

discharge is given as 0.6.Find the discharge of water through pipe.

Q.2 (a) Discuss the condition of equilibrium of a floating body.

(b) A rectangular plate 0.6mx1.2m is submerged in an oil bath of specific

gravity 0.8. The maximum and minimum depth of the plate are 1.6m and 0.75m

from the free surface. Calculate the hydrostatic face on the plate and depth of

center of pressure.

Q.3 (a) What is venturi meter? State the expression of discharge through

venturimeter.

(b) Define moment of momentum equation. Where this equation is used? \

Q.4 (a) Explain dimensionless numbers?

Q.5 (a) State and derive Pascal’s law.

(b) What is meant by centre of pressure? How does it vary with depth of fluid?

Q.6 (a) Define velocity potential function and stream function.

(b) Explain uniform flow with source and sink.

Q.7 (a) Define fundamental units and derived units.

(b) Define Reynold’s number and Froude’s number.

Q.8 (a)Derive Bernoulli’s theorem for steady flow of an incompressible fluid from

consideration of Momentum.

(b). Explain following laws:- (i) What is Euler’s Law? (ii) What is Stoke’s law?

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