This is CE6451 fluid mechanics and machinery university 16 marks question bank.
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ANNA UNIVERSITY CHENNAI
REGULATION 2013
REGULATION 2013
DEPARTMENT : MECHANICAL
YEAR/SEMESTER : II/III
SUBJECT CODE: CE6451
SUBJECT NAME: FLUID MECHANICS
AND MACHINERY
PART-B ( 16 Marks )
UNIT I- INTRODUCTION
01. Find the height through which water rises by capillary action in a 2mm bore, if surface tension at the prevailing temp is 0.075g/cm (APR-03)
02. Calculate the capillary rise in glass tube of 3mm dia when immersed in mercury take the surface tension and angle of contact of mercury as 0.52N/m and 130⁰ respectively .Also determine the minimum size of the glass tube, if it is immersed in water, given that the surface tension of water is 0.0725N/m and the capillary rise in the tube is not to exceed 0.5mm. (NOV-03)
03. Calculate the capillary effect in the glass tube 5mm dia, when immersed in 1)WATER 2)MERCURY .The surface tension of water and the mercury in contact with air are 0.0725N/m and 0.51N/m respectively. The angle of contact of mercury is 130⁰.
(NOV-04)
04. A 1.9mm dia tube is inserted in to an unknown liquid whose density is 960 kg/m^3 and it is observed that the liquid is rises 5mm in the tube, making a contact angle of 15⁰. Determine the surface tension of the liquid. (APR-08)
05. A capillary tube having inside dia 6mm is dipped in CCl4 at 20⁰c. Find the rise of CCl4 in the tube, if surface tension is 2.67N/m and the specific gravity is 1.594 and contact angle ɵ=60⁰ and specific weight of water at 20⁰c is 9981N/m^3 (DEC-08)
06. An oil film of thickness 10mm is used for lubrication between the two square parallel plates of size 0.9m×0.9m each, in which the upper plate moves at 2m/s required a force of 100N to maintain this speed. Determine, 1. Dynamic viscosity of oil 2. Kinematic viscosity of oil If the specific gravity of the oil is 0.95 (NOV-03)
07. The space between two square parallel plate is filled with oil. Each side of the plate is 75cm. The thickness of the oil film is 10mm. The upper plate which moves at 3M/s requires a force of 100N to maintain the speed. Determine 1. Dynamic viscosity of oil, 2. Kinematic viscosity of oil. If the specific gravity of oil is 0.9 (NOV-04)
08. If the velocity distribution of over a plate is given by u = (2/3)Y – Y2 in which ‘U’ is the velocity in meter per second at a distance ‘Y’ meter above the plate , determine the shear stress at Y=0 and Y=0.15m the dynamic viscosity of fluid is 8.63 poises. (DEC-11)
09. The velocity distribution over a plate is given by U = (3/4) Y – Y2 where U is the velocity in M/S and at the depth Y in m above the plate. Determine the shear stress at a distance of 0.3m from the top of plate. Assume dynamic viscosity of the fluid is taken as 0.95Ns/m^2.
(APR-12)
10. A fluid of specific velocity 0.9 flows along the surface with a velocity U=4Y-8Y^3 M/s where Y is in m, what is the velocity gradient at the boundary? If the kinematic viscosity is 0.36 S^. What is the shear stress at the boundary? (Nov-13)
11.An orifice meter consisting of 10cm orifice in a 25cm dia of pipe has a co-efficient 0.65. The pipe delivers oil of Specific gravity 0.8. The pressure difference between two sides of the orifice meter is 80cm of mercury column. Calculate flow rate in lit/sec. (APR-11)
12. A 250mm pipe carries oil (specific gravity= 0.8) at a velocity of 20m/s. At point A and B of measurement of pressure and elevation were respectively 100KN/m^2 and 60KN/m^2 , 5m and 8m respectively for steady flow .Find the loss of head between A and B and the direction of flow. (NOV 10)
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