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Home » Engineering » Chemical Engineering » Aptitude Test - 19
1.The discharge of a depressed nappe is 6 to 7 percent __________ that of a free nappe.
A. Less than
B. More than
C. Equal to
D. Less than
2. The line of action of the buoyant force acts through the Centroid of the
A. Submerged body
B. Volume of the floating body
C. Volume of the fluid vertically above the body
D. Submerged body
3.The intensity of pressure at any point, in a liquid, is
A. Directly proportional to the area of the vessel containing liquid
B. Directly proportional to the depth of liquid from the surface
C. Directly proportional to the length of the vessel containing liquid
D. Directly proportional to the area of the vessel containing liquid
4.During the opening of a valve in a pipe line, the flow is
A. Steady
B. Unsteady
C. Uniform
D. Steady
5.A manometer is used to measure
A. Atmospheric pressure
B. Pressure in pipes and channels
C. Pressure in Venturimeter
D. Atmospheric pressure
6. For hypersonic flow, the Mach number is
A. Unity
B. Greater than unity
C. Greater than 2
D. Unity
7.The theoretical velocity of jet at vena contracta is (where H = Head of water at vena contracta)
A. 2gH
B. H × √(2g)
C. 2g × √H
D. 2gH
8. For pipes, laminar flow occurs when Reynolds number is
A. Less than 2000
B. Between 2000 and 4000
C. More than 4000
D. Less than 2000
9.When the flow in an open channel is gradually varied, the flow is said to be
A. Steady uniform flow
B. Steady non-uniform flow
C. Unsteady uniform flow
D. Steady uniform flow
10. Property of a fluid by which molecules of different kinds of fluids are attracted to each other is called
A. Adhesion
B. Cohesion
C. Viscosity
D. Adhesion
11.A fluid which obeys the Newton's law of viscosity is termed as
A. Real fluid
B. Ideal fluid
C. Newtonian fluid
D. Real fluid
12. In order that flow takes place between two points in a pipeline, the differential pressure between these points must be more than
A. Frictional force
B. Viscosity
C. Surface friction
D. Frictional force
13.The error in discharge (dQ/Q) to the error in measurement of head (dH/H) over a triangular notch is given by
A. dQ/Q = 3/2 × (dH/H)
B. dQ/Q = 2 × (dH/H)
C. dQ/Q = 5/2 × (dH/H)
D. dQ/Q = 3/2 × (dH/H)
14. For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal
A. Ratio of inertial force to force due to viscosity
B. Ratio of inertial force to force due to gravitation
C. Ratio of inertial force to force due to surface tension
D. Ratio of inertial force to force due to viscosity
15.The value of coefficient of velocity for a sharp edged orifice __________ with the head of water.
A. Decreases
B. Increases
C. Remain same
D. Decreases
16.If cohesion between molecules of a fluid is greater than adhesion between fluid and glass, then the free level of fluid in a dipped glass tube will be
A. Higher than the surface of liquid
B. The same as the surface of liquid
C. Lower than the surface of liquid
D. Higher than the surface of liquid
17.The ratio of the inertia force to the __________ is called Euler's number.
A. Pressure force
B. Elastic force
C. Surface tension force
D. Pressure force
18.A one dimensional flow is one which
A. Is uniform flow
B. Is steady uniform flow
C. Takes place in straight lines
D. Is uniform flow
19.According to Manning's formula, the discharge through an open channel is (where M = Manning's constant)
A. A × M × m1/2 × i2/3
B. A × M × m2/3 × i1/2
C. A1/2 × M2/3 × m × i
D. A × M × m1/2 × i2/3
20.Pascal-second is the unit of
A. pressure
B. kinematic viscosity
C. dynamic viscosity
D. pressure
21.An ideal fluid is
A. one which obeys Newton's law of viscosity
B. frictionless and incompressible
C. very viscous
D. one which obeys Newton's law of viscosity
22.The unit of kinematic viscosity is
A. gm/cm-sec2
B. dyne-sec/cm2
C. gm/cm2-sec
D. gm/cm-sec2
23.If the dynamic viscosity of a fluid is 0.5 poise and specific gravity is 0.5, then the kinematic viscosity of that fluid in stokes is
A. 0.25
B. 0.50
C. 1.0
D. 0.25
24. The viscosity of a gas
A. decreases with increase in temperature
B. increases with increase in temperature
C. is independent of temperature
D. decreases with increase in temperature
25. Newton's law of viscosity relates
A. intensity of pressure and rate of angular deformation
B. shear stress and rate of angular de¬formation
C. shear stress, viscosity and tempe¬rature
D. intensity of pressure and rate of angular deformation
26.An open tank contains 1 m deep water with 50 cm depth of oil of specific gravity 0.8 above it. The intensity of pressure at the bottom of tank will be
A. 4 kN/m2
B. 10 kN/m2
C. 12 kN/m2
D. 4 kN/m2
27.The position of centre of pressure on a plane surface immersed vertically in a static mass of fluid is
A. at the centroid of the submerged area
B. always above the centroid of the area
C. always below the centroid of the area
D. at the centroid of the submerged area
28.The total pressure on a plane surface inclined at an angle 9 with the horizontal is equal to
A. PA
B. pA sin 9
C. pA cos 9
D. PA
29.A vertical rectangular plane surface is submerged in water such that its top and bottom surfaces are 1.5 m and 6.0 m res-pectively below the free surface. The position of centre of pressure below the
A. 3.75 m
B. 4.0 m
C. 4.2m
D. 3.75 m
30.Centre of buoyancy always
A. coincides with the centre of gravity
B. coincides with the centroid of the volume of fluid displaced
C. remains above the centre of gravity
D. coincides with the centre of gravity
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