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Quiz 6
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Q.1
If Blausius or Darcey friction factor is 'f₁' then the Fanning friction factor is equal to
f₁/4
4F₂
2f₁
f₁/2
Q.2
Nature of fluid flow during the opening of a valve in a pipeline is
Laminar
Unsteady
Steady
Uniform
Q.3
The equivalent diameter for pressure drop calculation for a fluid flowing through a rectangular cross-section channels having sides 'x' & 'y' is given by
2xy/(x+y)
xy/(x+y)
(x+y)/2xy
(x+y)/xy
Q.4
Pick out the wrong statement.
The eddy viscosity is a function of the type of turbulence involved
The eddy viscosity is a fluid property
The viscosity of gas increases with increase in temperature
The viscosity of a liquid increases with decrease in temperature
Q.5
Correction for capillary effect in manometers (used for pressure measurement) need not be applied, if diameter of the manometer tube is __________ mm.
< 4
> 4
> 12.5
< 10
Q.6
Turbulent flow generally occurs for cases involving
Highly viscous fluid
Very narrow passages
Very slow motion
None of these
Q.7
Where does the maximum stress occur in case of laminar flow of incompressible fluid in a closed conduit of diameter 'd'?
At the centre
At d/4 from the wall
At the wall
At d/8 from the wall
Q.8
For the laminar flow of a fluid in a circular pipe of radius R, the Hagen-Poisseule equation predicts the volumetric flow rate to be proportional to
R
R
2
R
4
R
0.5
Q.9
When a fluid flows over a solid surface, the
Velocity is uniform at any cross-section
Velocity gradient is zero at the solid surface
Resistance between the surface & the fluid is lesser as compared to that between the fluid layers themselves
Velocity is not zero at the solid surface
Q.10
N. second/m² is
The S.I. unit of dynamic viscosity
The S.I. unit of kinematic viscosity
Equivalent to one poise
Equivalent to one stoke
Q.11
Discharge in laminar flow through a pipe varies
As the square of the radius
Inversely as the pressure drop
Inversely as the viscosity
As the square of the diameter
Q.12
In the complete turbulence zone (in rough pipes), the
Rough and smooth pipes have the same friction factor
Laminar film covers the roughness projections
Friction factor depends upon NRe only
Friction factor is independent of the relative roughness
Q.13
The ratio of maximum to average velocity in case of streamline flow between parallel plates is
1
1.5
2
2.5
Q.14
Pick out the wrong statement.
The shear stress at the pipe (dia = D, length = L) wall in case of laminar flow of Newtonion fluids is #####
In the equation, the value of
Shear stress for Newtonion fluid is proportional to the rate of shear in the direction perpendicular to motion
With increase in the Mach number >0.6, the drag co-efficient decreases in case of compressible fluids
Q.15
Which of the following can be used for the direct measurement of volumetric flow rate of slurry?
Venturimeter
Orificemeter
Rotameter
Pitot tube
Q.16
In case of a pipe of constant cross-sectional area, the maximum fluid velocity obtainable is
The velocity of sound
Dependent on its cross-sectional area
Dependent on fluid viscosity
Dependent on fluid density
Q.17
Minimum porosity for fluidisation is
That corresponding to static bed
That corresponding to completely fluidised bed
The porosity of the bed when true fluidisation begins
Less than that of the' static bed
Q.18
What is the speed of sound (m/sec) in ordinary water?
3000
1500
330
1000
Q.19
The effect of solid boundary on the fluid flow is confined to the boundary layer, except for fluids
Having high viscosities
Moving at low velocities
Both A and B
Neither A nor B
Q.20
The pressure head of a flow meter remains constant for
Venturimeter
Orificemeter
Rotameter
Pitot tube
Q.21
Existence of boundary layer in fluid flow is because of the
Surface tension
Fluid density
Fluid viscosity
Gravity forces
Q.22
Acceleration head in a reciprocating pump
Increases the work done during delivery stroke
Decreases the work done during suction stroke
Does not change the work requirement of the pump
Increases the work done during suction stroke
Q.23
The continuity equation in ideal fluid flow states that
Net rate of inflow into any small volume must be zero
Energy is not constant along a streamline
Energy is constant along a streamline
There exists a velocity potential
Q.24
Baffles in mixing tanks are provided to
Reduce swirling and vortex formation
Increase the structural strength of the tank
Aid in rotational flow
None of these
Q.25
Deformation drag, which is caused by widespread deformation of fluid around the immersed body
Occurs when N
Re
is very small
Is primarily a friction drag
Is independent of body length
Depends mainly on cross-sectional shape
Q.26
For an ideal fluid flow, Reynolds number is
2100
100
0
∞
Q.27
For ideally incompressible fluid, the Mach number will be
1.5
1
0
5
Q.28
Centrifugal pump can't be used to pump
Molten sodium (used as a coolant in Fast Breeder Reactor)
Moderately viscous vegetable oil used in soap industry
Thick molten soap at 80°C
None of the above
Q.29
The general relationship between speed N, head H, power P and discharge Q for a centrifugal pump is
Q∝N : H∝N² : P∝N³
Q∝N² : H∝N³ : P∝N
Q∝N : H∝N³ : P∝N²
Q∝N³ : H∝N : P∝N²
Q.30
Which of the following assumptions enables the Euler's equation of motion to be integrated?
The fluid is incompressible
The fluid is non-viscous
The continuity equation is satisfied
The flow is rotational and incompressible
Q.31
Flow measurement in an open channel is done by a/an
Venturimeter
Orificemeter
Weir
Rotameter
Q.32
Dean number is concerned with the
Fluid-particle interaction
Fluid flow through helical pipes
Power consumption in agitated vessels
Psychrometry
Q.33
Ratio of pressure and inertia force gives __________ number.
Weber
Mach
Euler
Froude
Q.34
Froude number is not a factor
For Reynolds number greater than 300
When there is no vortex formation
For unbaffled tank
None of these
Q.35
The percentage slip in a reciprocating pump set is given by the % of (where, Q₁ = actual discharge Q₂ = theoretical discharge)
Q₁/Q₂
Q₂/Q₁
(Q₂ - Q₁)/Q₁
(Q₂ - Q₁)/Q₂
Q.36
What is the shear rate at the pipe wall, in case of laminar flow of Newtonion fluids in a pipe of diameter 'D' & length 'L' incurring a pressure drop 'Δp' with average velocity 'V
avg
'?
D Δp/8L
D Δp/4L
8 . V
avg
/D
4 . V
avg
/D
Q.37
Foot valves provided in pumps are __________ valves.
Relief
Three/four way
Pressure reducing
Directional control
Q.38
Theoretical head developed by a centrifugal pump does not depend upon the __________ the impeller.
Radius of
Speed of
Fluid velocity leaving
None of these
Q.39
The exit cone angle in case of a standard venturimeter is __________ the entrance cone angle.
Smaller than
Greater than
Equal to
Either A or B
Q.40
Transition length for a turbulent fluid entering into a pipe is around __________ times the pipe diameter.
5
50
500
1000
Q.41
Gear pump
Is a positive displacement pump
Is a centrifugal pump
Is a non-positive displacement pump
Can be started with delivery valve closed
Q.42
In case of a centrifugal pump, the theoretical head developed is dependent on the __________ the impeller.
Speed of
Diameter of
Fluid velocity leaving
All of the above
Q.43
Power loss in an orificemeter is __________ that in a venturimeter.
Less than
Same as
More than
Data insufficient, cannot be predicted
Q.44
The terminal velocity of a particle moving through a fluid varies as d
p
n
. The value of n is equal to __________ in Stoke's law regime.
1
0.5
2
1.5
Q.45
Froude number is the ratio of
Shear stress to gravitational stress
Drag stress to shear stress
Inertial stress to shear stress
Inertial stress to gravitational stress
Q.46
Applicability of Bernoulli's equation is limited to a/an __________ fluid, that does not exchange shaft work with the surroundings.
Incompressible
Non-viscous
Both A and B
Neither A nor B
Q.47
The maximum discharge through a circular channel takes place, when the depth of the fluid flow is __________ times the pipe diameter.
0.25
0.5
0.66
0.95
Q.48
Transition length for turbulent flow in smooth pipe is equal to __________ times the pipe diameter.
0.5
5
50
100
Q.49
The fluid in which the shearing stress within it is proportional to the velocity gradient across the sheared section, is called a __________ fluid.
Bingham
Newtonion
Perfect
None of these
Q.50
The distance between metacentre and __________ is called metacentric height.
Water surface
Centre of gravity
Centre of buoyancy
None of these
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