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Quiz 10
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Q.1
The pressure at a point in a fluid is not the same in all directions, when the fluid is viscous and
Moving
Static
Cold
Hot
Q.2
In fluid flow, the stagnation point is defined as a point, where the __________ is zero.
Flow velocity
Pressure
Total energy
All of the above
Q.3
Dimension of surface tension is(where, F = force, L = length)
FL⁻¹
F⁻¹ . L
F.L⁻²
F⁻² . L
Q.4
In fluid flow, cavitation is caused, if the
Fluid velocity decreases to zero
Total energy decreases
Both A and B
Flow pressure approaches its vapor pressure at the prevailing temperature
Q.5
Mach number is the ratio of the speed of the
Fluid to that of the light
Light to that of the fluid
Fluid to that of the sound
Sound to that of the fluid
Q.6
Which of the following valves will incur maximum pressure drop for the same discharge of water?
Globe valve
Gate valve
Needle valve
Butterfly valve
Q.7
When larger particles e.g., grains are subjected to fluidisation, the corresponding bed produced is termed as the __________ bed.
Spouted
Sluggish
Boiling
Teeter
Q.8
Co-efficient of velocity is __________ the coefficient of discharge.
Less than
More than
Equal to
Not related to
Q.9
Kinetic energy of fluid per unit weight represented by the velocity head is given by
2v²/gc
v²/2gc
ρv²/gc
ρ.v²/2gc
Q.10
The net positive suction head (NPSH) of a centrifugal pump is defined as the sum of the velocity head and the pressure head at the
Discharge
Suction
Suction minus vapor pressure of the liquid at suction temperature
Discharge minus vapor pressure of the liquid at the discharge temperature
Q.11
Bernoulli's equation for steady, frictionless, continuous flow states that the __________ at all sections is same.
Total pressure
Total energy
Velocity head
None of these
Q.12
If in a flow field, between any two points, then the flow must be
Steady, incompressible, irrotational
Steady, compressible, irrotational
Steady, compressible and along a streamline
Unsteady, incompressible, irrotational
Q.13
Which of the following factors does not contribute to the pressure drop in a pipeline ?
Velocity of fluid
Size of pipe
Length of pipe and number of bends
None of these
Q.14
Maintenance cost of a __________ pump for a particular duty is the least.
Centrifugal
Reciprocating
Volute
Gear
Q.15
For a given Reynold number as d/D for an orifice increases, Cd will (where, d & D are orifice & pipe diameters respectively).
Increase
Decrease
Remain constant
Either A or B; depends on other factors
Q.16
When the momentum of one fluid is used for moving another fluid, such a device is called a/an
Jet pump
Blower
Acid egg
None of these
Q.17
If more than two branches of pipes are to be connected at the same point, then use a/an
Elbow
Union
Tee
None of these
Q.18
Which law is followed by the velocity distribution in the turbulent boundary layer?
Parabolic law
Linear law
Logarithmic law
None of these
Q.19
With increase in temperature, the vapor pressure of liquids
Increases
Increases linearly
Decreases
Remains constant
Q.20
Hydraulic mean depth (D
m
) for a circular pipe of diameter 'D' flowing full is 0.25 D. For a circular channel, at D
m
= 0.3 D, gives the condition for the maximum
Flow rate
Mean velocity
Both A & B
Neither A nor B
Q.21
A bed consists of particles of density 2000 kg/m³. If the height of the bed is 1.5 metres and its porosity 0.6, the pressure drop required to fluidise the bed by air is
25.61 kPa
11.77 kPa
14.86 kPa
21.13 kPa
Q.22
Which of the following is most prone to pulsating discharge flow ?
Centrifugal pump
Reciprocating pump
Gear pump
Axial flow pump
Q.23
Fanning friction factor equation applies to the __________ fluid flow.
Non-isothermal condition of
Compressible
Both A and B
Neither A nor B
Q.24
A piezometer provided in the pipe measures
Friction factor
Static pressure
Dynamic pressure
None of these
Q.25
Air vessel of a reciprocating pump is initially filled with
Atmospheric air
Compressed air
Water
None of these
Q.26
Vena-contracta pressure tapping is at a distance __________ from the position of an orificemeter fitted in a pipe of internal diameter 'd'
D
0.5d
2d
4d
Q.27
I.D. of 1/4" schedule 40 pipe is 0.364". I.D. of a 1/2" schedule 40 pipe would be __________ inch
4.728
0.5
0.622
0.474
Q.28
A centrifugal pump loses prime after starting. The reason of this trouble may be
Incomplete priming
Too high a suction lift
Low available NPSH and air leaks in the suction pipe
All of the above
Q.29
In a fully turbulent flow (Re > 10
5
) in a pipe of diameter 'd', for a constant pressure gradient, the dependence of volumetric flow rate of an incompressible fluid is
d
d
2
d
2.5
d
4
Q.30
Foot valves are provided in the suction line of a centrifugal pump to
Avoid priming, every time we start the pump
Remove the contaminant present in the liquid
Minimise the fluctuation in discharge
Control the liquid discharge
Q.31
Pumping of a corrosive liquid is generally preferred to be done by a __________ pump, as it can be made of a variety of materials including plastics.
Piston
Gear
Positive displacement
Sump
Q.32
C
d
for the orifice plate varies from
0.58 to 0.8
0.93 to 0.98
0.2 to 0.3
0.02 to 0.03
Q.33
Most commonly used joint in the underground pipe lines is the
Sleevejoint
Coupling
Flange
Expansion joint
Q.34
The hydraulic diameter of an annulus of inner and outer radii R
i
and R
o
respectively is
4(R
o
-R
i
)
√(R
o
-R
i
)
2(R
o
-R
i
)
R
o
+ R
i
Q.35
The valve commonly used in pipes larger than 2" dia is a
Globe valve
Plug-cock
Gate valve
Check valve
Q.36
Non-colloidal solution is an example of the __________ fluid.
Non-Newtonion
Newtonion
Dilatent
Pseudoplastic
Q.37
Fluid flow at increasing rate through a diverging pipe is an example of __________ flow.
Steady uniform
Non-steady uniform
Steady non-uniform
Non-steady non-uniform
Q.38
The equation relating friction factor to Reynold number, f
-0.5
= 4 log
e
(N
Re
/√f)
-0.4
, is called the __________ equation.
Nikuradse
Von-Karman
Blausius
Colebrook
Q.39
Friction produced by the formation of wakes is called the __________ friction.
Disk
Skin
Form
None of these
Q.40
For a specific centrifugal air blower operating at constant speed & capacity, the power requirement and pressure vary
Directly as square of gas density
Directly as gas density
Directly as square root of gas density
Inversely as gas density
Q.41
The range of a particular rotameter can be increased by
Use of floats of different densities
No means
Increasing the diameter of the float
Decreasing the diameter of the float
Q.42
Propeller type centrifugal pumps are most suitable for
High capacity at high heads
High capacity at low heads
Low capacity at high heads
Low capacity at low heads
Q.43
The pipe wall thickness is minimum for a pipe of given nominal size having schedule number
160
120
80
40
Q.44
A pressure head of 320 metres of water in meters of CCl₄ (sp.gr = 1.6) will be
100
200
320
160
Q.45
A fluidis (μ/ρ = 0.01 cm²/sec) moving at critical flow condition (N
Re
= 2100) through a pipe of dia 3 cms. Velocity of flow is __________ cm/sec.
7
700
7000
630
Q.46
Lower BWG means __________ of the tube.
Lower thickness
Lower cross-section
Outer diameter
Inner diameter
Q.47
In magnetic flow meters, voltage generation is
Due to the motion of conducting fluid through an externally generated uniform field
Proportional to the fluid velocity
Both A and B
Neither A nor B
Q.48
The flow of a liquid through tapering pipe at a constant rate is an example of __________ flow.
Steady uniform
Steady non uniform
Unsteady uniform
Unsteady non uniform
Q.49
Gradually varying fluid flow is an example of __________ flow.
Non-steady uniform
Non-steady non-uniform
Steady uniform
Steady non-uniform
Q.50
Centre of pressure of a plane surface of arbitrary shape immersed vertically in a static mass of fluid
Lies above the centroid of the plane surface
Is independent of the specific weight of the fluid
Is different for different fluids
Is at the centroid of the plane surface
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