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Hydraulics And Fluid Mechanics
Quiz 3
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Q.1
The discharge through a V- notch varies as
H1/2
H3’2
H5/2
H5’4 where H is head.
Q.2
The units of viscosity are
metre
2
/sec
kg sec/metre
newton-sec/metre
2
newton-sec/metre
Q.3
Operation of McLeod gauge used for low pressure measurement is based on the principle of
gas law
Boyle’s law
Charle’s law
Pascal’s law
Q.4
The pressure in Pascals at a depth of 1 m below the free surface of a body of water will be equal to
1 Pa
91 Pa
981 Pa
9810 Pa
Q.5
Which of the following is demensionless
specific weight
specific volume
specific speed
specific gravity
Q.6
A large Roynold number is indication of
smooth and streamline flow
laminar flow
turbulent flow
highly turbulent flow.
Q.7
Separation of flow occurs when
the pressure intensity reaches a minimum
the cross-section of a channel is reduced
the boundary layer comes to rest
all of the above
Q.8
Two dimensional flow occurs when
the direction and magnitude of the velocity at all points are identical
the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time
the magnitude and direction of the velocity do not change from point to point in the fluid
the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane
Q.9
Ay between two stream lines represents
velocity
discharge
head
pressure
Q.10
The continuity equation pi V,A,= p2V2A2 is based on the following assumption regarding flow of fluid (where pi and p2 are mass densities.)
steady flow
uniform flow
incompressible flow
frictionless flow
Q.11
The position of center of pressure on a plane surface immersed vertically in a static mass of fluid is
at the centroid of the submerged area
always above the centroid of the area
always below the centroid of the area
none of the above
Q.12
If a sphere of diameter 1 cm falls in castor oil of kinematic viscosity 10 stokes, with a terminal velocity of 1.5 cm/sec, the coefficient of drag on the sphere is
less than 1
between 1 and 100
160
200
Q.13
When a body floating in a liquid, is displaced slightly, it oscillates about
e.g. of body
center of pressure
center of buoyancy
metacentre
Q.14
Uniform flow occurs when
the flow is steady
the flow is streamline
size and shape of the cross section in a particular length remain constant
size and cross section change uniformly along length
Q.15
Surface tension has the units of
newtons/m
2
newtons/cm
newtons/m
newtons
Q.16
The horse power transmitted through a pipe is maximum when the ratio of loss of head due to friction and total head supplied is
1/3
1/4
1/2
2/3
Q.17
Thee horizontal component of buoyant force is
negligible
same as buoyant force
zero
none of the above
Q.18
Normal depth in open channel flow is the depth of flow corresponding to
steady flow
unsteady flow
laminar flow
uniform flow
Q.19
Choose the wrong statement
any weight, floating or immersed in a liquid, is acted upon by a buoyant force
Buoyant force is equal to the weight of the liquid displaced
The point through which buoyant force acts, is called the center of buoyancy
Center of buoyancy is located above the center of gravity of the displaced liquid v
Q.20
When an ideal fluid flows past a sphere
highest intensity of pressure occurs around the circumference at right angles to flow
lowest pressure intensity occurs at front stagnation point
lowest pressure intensity occurs at rear stagnation point
total drag is zero
Q.21
The value of friction factor ‘f’ for smooth pipes for Reynolds number 106 is approximately equal to
0.1
0.01
0.001
0.0001
Q.22
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 center of pressure below the free surface will be at a distance of
3.75 m
4.0 m
4.2m
4.5m
Q.23
An object having 10 kg mass weighs 9.81kg on a spring balance. The value of ‘g’ at this place is
10m/sec²
9.81 m/sec²
10.2/m sec
9.75 m/sec²
Q.24
In a two dimensional incompressible steady flow around an airfoil, the stream lines are 2 cm apart at a great distance from the airfoil, where the velocity is 30 m/sec. The velocity near the airfoil, where the stream lines are 1.5 cm apart, is
22.5 m/sec.
33 m/sec.
40 m/sec.
90 m/sec.
Q.25
According to the principle of buoyancy a body totally or partially immersed in a fluid will be lifted up by a force equal to
the weight of the body
more than the weight of the body
less than the weight of the body
weight of the fluid displaced by the body
Q.26
Metacentric height is given as the distance between
the center of gravity of the body andthe meta center
the center of gravity of the body and the center of buoyancy
the center of gravity of the body and the center of pressure
center of buoyancy and metacentre
Q.27
The theoretical value of coefficient of contraction of a sharp edged orifice is
0.611
0.85
0.98
1.00
Q.28
Coefficient of velocity of venturimeter
is independent of Reynolds number
decreases with higher Reynolds number
is equal to the coefficient of discharge of venturimeter
none of the above
Q.29
A model of a reservior is drained in 4 mts by opening the sluice gate. The model scale is 1: 225. How long should it take to empty the prototype ?
4 minutes
4 x (225)3/2 minutes
4 (225)1/3 minutes
4 x (225)1/2 minutes
Q.30
The region between the separation streamline and the boundary surface of the solid body is known as
wake
drag
lift
boundary layer
0 h : 0 m : 1 s
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