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Civil Engineering
Hydraulics And Fluid Mechanics
Quiz 6
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Q.1
A piece weighing 3 kg in air was found to weigh 2.5 kg when submerged in water. Its specific gravity is
1
5
7
6
Q.2
The horizontal component of force on a curved surface is equal to the
product of pressure intensity at its centroid and area
force on a vertical projection of the curved surface
weight of liquid vertically above the curved surface
force on the horizontal projection of the curved surface
Q.3
The distance from pipe boundary, at which the turbulent shear stress is one-third die wall shear stress, is (where R is the radius of pipe)
1/3 R
1/2 R
2/3 R
3/4 R
Q.4
For measuring flow by a venturimeter, if should be installed in
vertical line
horizontal line
inclined line with upward flow
in any direction and in any location.
Q.5
Which of the following instrument can be used for measuring speed of an aeroplane
Venturimeter
Orifice plate
rotameter
pitot tube
Q.6
The increase in meta centric height
i) increases stability
ii) decreases stability
iii) increases comfort for passengers
iv) decreases comfort for passengers
The correct answer is
(i) and (iii)
(i) and (iv)
(ii) and (iii)
(ii) and (iv)
Q.7
Select the correct statement
Local atmospheric pressure depends upon elevation of locality only
Standard atmospheric pressure is the mean local atmospheric pressure a* sea level
Local atmospheric pressure is always below standard atmospheric pressure
A barometer reads the difference be-tween local and standard atmospheric pressure
Q.8
Least possible value of correction factor for
i) kinetic energy is zero
ii) kinetic energy is 1
iii) momentum is zero
iv) momentum is 1
The correct statements are
(i) and (iii)
(ii) and (iii)
(i) and (iv)
(ii) and (iv)
Q.9
The discharge over a broad crested weir is maximum when the depth of flow is (where H is the available head)
H/3
H/2
2 H/5
2 H/3
Q.10
The line of action of the buoyant force acts through the centroid of the
submerged body
volume of the floating body
volume of the fluid vertically above the body
displaced volume of the fluid
Q.11
Two pipes of same length and diameters d and 2d respectively are connected in series. The diameter of an equivalent pipe of same length is
less than d
between d and 1.5 d
between 1.5 d and 2d
greater than 2d
Q.12
The flow in which conditions do not change with time at any point, is known as
one dimensional flow
uniform flow
steady flow
turbulent flow
Q.13
The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as
center of gravity
center of buoyancy
center of pressure
metacentre
Q.14
The fluid forces considered in the Navier Stokes equation are
gravity, pressure and viscous
gravity, pressure and turbulent
pressure, viscous and turbulent
gravity, viscous and turbulent
Q.15
The tendency of a liquid surface to contract is due to the following property
cohesion
adhesion
viscosity
surface tension
Q.16
The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as
meta center
center of pressure
center of buoyancy
center of gravity
Q.17
When time of closure tc = L/v0 (where L is length of pipe and v0 is speed of pressure wave), the portion of pipe length subjected to maximum head is
L/4
L/3
L/2
L
Q.18
Cavitation will begin when
the pressure at any location reaches an absolute pressure equal to the saturated vapour pressure of the liquid
pressure becomes more than critical pressure
flow is increased
pressure is increased
Q.19
Pascal-second is the unit of
pressure
kinematic viscosity
dynamic viscosity
surface tension
Q.20
Which of the following statements is correct?
Lower critical Reynolds number is of no practical significance in pipe flow problems.
Upper critical Reynolds number is significant in pipe flow problems.
Lower critical Reynolds number has the value 2000 in pipe flow
Upper critical Reynolds number is the number at which turbulent flow changes to laminar flow.
Q.21
Centre of pressure compared to e.g. is
above it
below it
at same point
above or below depending on area of body
Q.22
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
0.25
0.50
1.0
none of the above
Q.23
An ideal flow of any fluid must satisfy
Pascal law
Newton’s law of viscosity
boundary layer theory
continuity equation
Q.24
If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.2 kg/cm”, the pressure at a depth of 50 m below the oil surface will be
2 meters of water column
3 meters of water column
5 meters of water column
6 meters of water Column
Q.25
The pressure in the air space above an oil (sp. gr. 0.8) surface in a tank is 0.1 kg/cm”. The pressure at 2.5 m below the oil surface will be
2 meters of water column
3 meters of water column
3.5 meters of water column
4 m of water column
Q.26
In case of an airfoil, the separation of flow occurs
at the extreme rear of body
at the extreme front of body
midway between rear and front of body
any where between rear and front of body depending upon Reynolds number
Q.27
The property of fluid by virtue of which it offers resistance to shear is called
surface tension
adhesion
cohesion
viscosity
Q.28
Falling drops of water become spheres due to the property of
adhesion
cohesion
surface tension
viscosity
Q.29
Which of the following is the unit of kinematic viscosity
pascal
poise
stoke
faraday
Q.30
Ratio of inertia force to surface Jension is known as
Mach number
Froude number
Reynold’s number
Weber’s number
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