Mechanical Biomedical Equipment (10-points)Lab. Test
XXXXX XX, XXXX Time: 60 minutes Marks
3 3 3 3 3
1 10 10 , 1000 /waterliter m cm kg m
Q. 1 For flow rate 600 /Q liter h : (3)
(a) If the Cylindrical throat of the Venturi tube has the area 85 mm2 and static pressure from manometers (throat region) h = 55 mm
Calculate (i) velocity (ii) dynamic pressure (iii) total pressure for the throat (Write all details)
(b) For a Venturi tube (lying horizontally) the cylindrical throat has the cross-sectional area 100 mm2 and the cross-sectional area of the inlet portion is 500 mm2 . The speed of water in the throat is 6 m / s and pressure there is 200 kPa. Calculate the speed, rate of flow and pressure of water in the inlet portion.
(Write all details)
(c) For the following data calculate the average value of discharge coefficient dC for Venturi tube.
Flow rate
actualV
/liters h
1h
mm
throath
mm
Flow rate 4
13.87 10theory throatV h h
3 /m s dC
500 291 149
450 285 161
Average value of discharge coefficient ________________dC
Q. 2 (1.5) (a) If mass of the metal bar in air is 48.98m g , and its apparent mass is (while immersed in water)
42.35m g . Calculate the density of the metal bar. (Write all details)
(b) Using the following data
Mass of wood cylinder = 10.193 g,
Length wood cylinder = 60.2 mm
Diameter wood cylinder = 21.6 mm
Volume of water in graduated cylinder 350iV ml .
Volume of water with immerse wood cylinder in graduated cylinder 362fV ml .
Determine (a) the Buoyant force BF on the object, (b) the weight of the displaced water and (c) density of
the wood wood
. (Write all details)
Q. 3 Using the parameters (system in balance) shown in the Pascal apparatus: (1)
(a) Find the total force of water on the sealing pad
(b) Calculate the pressure if the diameter of the tube is 26 mm.
Q. 4Graph for Al tensile test: (2)
Figure Aluminum (Al) tensile test
(a) If the diameter of Al wire used for theses measurements is 4 mm and its length is 6 cm. Using graph and given parameter of the material
Estimate (i) ultimate stress (ii) ultimate strain
(b) Young’ modulus for a wire is 4
7 10 .MPa Calculate the force needed to stretch the wire by 1 mm.
The length and diameter of the wire is 80 cm and 2 mm respectively. (Write all details)
(c) The table below shows by how much a metal rod 120 cm long whose cross sectional area is 16 mm2 stretches when various loads are applied. From the data draw a sress strain curve for the metal and find its Young’s modulus.
L (mm) 0 0.63 1.25 1.88 2.50 3.13
Load (kN) 0 1 2 3 4 5
Q. 5. Calibration of a Bourdon-type pressure gusage:
If the diameter of the piston = 13.64 mm. Calculate the pressure (in Kilo Newton / m2 ) for the load mass (including piston) 850 grams. (Write all details) (0.75)
Q. 6. (1.75)(a) Calculate the Reynolds number for the following parameters, when a steel ball is dropped in water using viscometer apparatus. (Write all details)
Diameter of the steel ball = 30 mm
Distance travelled by the ball in the water tube = y = 1200 mm
Time taken by the ball to cover the distance = t= 1.16 second
Kinematic viscosity for water =
2
6
1.006 10 m
s
(b) After terminal velocity is reached, the acceleration of a body falling through a fluid is:
(i) zero (ii) equal to g (iii) less than g (iv) greater than g
(v) maximum (vi) None of the five (**g = acceleration due to gravity=9.8 m/s2 )
(c) When a ball is dropped in vegetable oil using graduated cylinder:
(i) Write the names of forces acting on the ball
(ii) Write the equation of motion of the system
