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Quiz 4
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Q.1
A spherical particle is falling slow in a viscous liquid such that Reynolds number is less than 1. Which statement is correct for this situation?
Inertial and drag forces are important
Drag, gravitational and buoyancy forces are impportant
Drag force and gravitational forces are important
None of the above
Q.2
The pressure head on sudden contraction in a horizontal pipe is converted into the __________ head.
Elevation
Velocity
Both A and B
Neither A nor B
Q.3
A 0.5 m high bed made up of a 1 mm dia glass sphere (density 2500 kg/m³ ) is to be fluidised by water (density 1000 kg/m³ ). If at the point of incipient fluidisation, the bed voidage is 40%, the pressure drop across the bed is
4.4 KPa
2.94 KPa
3.7 KPa
None of these
Q.4
A pressure of 10 m head of water is equivalent to __________ kN/m².
98
147
196
49
Q.5
Differential manometer measures the
Atmospheric pressure
Sub-atmospheric pressure
Pressure difference between two points
None of these
Q.6
Horsepower requirement for given pump capacity depends upon the
Specific gravity of the liquid
Suction lift
Discharge head
All of the above
Q.7
Working of a __________ pump characterises mixed flow.
Turbine
Piston
Diaphragm
None of these
Q.8
The co-efficient of drag and lift for an incompressible fluid depends on the
Reynolds number
Froude number
Mach number
All of the above
Q.9
__________ flow means the flow of incompressible fluid with no shear.
Potential
Streamline
Creep
Boundary layer
Q.10
Mach number is defined as the ratio of the local flow velocity to the sonic velocity in the fluid. For what value of Mach number, the gases are considered incompressible?
< 0.3
> 3
50
1
Q.11
The fluid velocity varies as the square of the cylindrical pipe diameter, in case of steady state laminar flow at constant pressure drop, for __________ fluid.
Newtonion
Dilatant
Pseudoplastic
Non-Newtonion
Q.12
Enamels and paints are generally __________ fluid.
Reheopectic
Pseudo-plastic
Thixotropic
Dilatant
Q.13
Major loss in sudden contraction in pipe flow is due to
Boundary friction
Flow contraction
Expansion of flow after sudden contraction
None of these
Q.14
The Prandtl pitot tube measures the
Velocity at a point in the flow
Pressure at a point
Average flow velocity
Pressure difference in pipe flow
Q.15
Viscosity of water at 40°C lies in the range of
1 x 10⁻³ to 2 x 10⁻³ kg/m.s
0.5 x 10⁻³ to 1 x 10⁻³ kg/m.s
1 to 2 kg/m.s
0.5 to 1 kg/m.s
Q.16
Which of the following conditions must be satisfied for lift force to be developed?
The body should be bluff body
The body should be stream lined
Circulation around the body is essentially required
The main stream velocity must approach the velocity of sound in that fluid medium
Q.17
Power number is the ratio of
Drag stress to inertial stress
Inertial stress to drag stress
Inertial stress to gravitational stress
Gravitational stress to drag stress
Q.18
Prandtl mixing length is
Applicable to laminar flow problems
A universal constant
Zero at the pipe wall
None of these
Q.19
Which is the correct relationship for a centrifugal pump? (where, D = Impeller diameter, inches H = Head developed, ft of liquid pumped N = Speed of pump, rpm)
D = 1840 H
0.5
/N
D = 1840 N/H
0.5
H = 1840 D
0.5
/N
D = 1840 H/N
Q.20
Purpose of air lift pump is to
Compress air
Lift compressed air
Lift water from a well by using compressed air
Lift air under negative pressure
Q.21
Pressure gradient in the pipe flow is influenced by the
Diameter of pipe
Velocity of the fluid
Density & viscosity of the fluid
All of the above
Q.22
For the same flow rate of a fluid, the pressure drop is the least for
Venturimeter
Orificemeter
Flow-nozzle
Δp is same for all
Q.23
Isothermal turbulent flow of a fluid results in decrease of its pressure, which depends on the
Wall roughness
Reynolds number
Both A and B
Neither A nor B
Q.24
Venturimeters, orificemeters and nozzles are used to measure the fluid discharge from a pipeline. The average fluid velocity in a pipeline can be measured by a/an
Weir
Hot wire anemometer
Cup and vane aneometer
None of these
Q.25
Pick out the correct statement.
Human blood is a Newtonion fluid
A Newtonion fluid obeys Newton's law of cooling
For a non-Newtonion fluid, a straight line passes through the origin in a plot between shear stress and shear gradient
Thin lubricating oil is an example of a non-Newtonion fluid
Q.26
Pipes having diameter 14 inches or more are designated by their
Outside diameter
Inside diameter
Schedule number
None of these
Q.27
For flow past a flat plate, if x is the distance along the plate in the direction of flow, the boundary layer thickness is proportional to
√x
1/√x
X
1/x
Q.28
Unsteady uniform flow is represented by flow through a/an
Long pipe at constant rate
Long pipe at decreasing rate
Expanding tube at increasing rate
Expanding tube at constant rate
Q.29
Unsteady non-uniform flow is represented by flow through a/an
Long pipe at constant rate
Long pipe at decreasing rate
Expanding tube at increasing rate
Expanding tube at constant rate
Q.30
A pump operating under specific conditions delivers insufficient quantity of liquid. This may be set right by
Decreasing the size of the inlet pipe
Increasing the size of the inlet pipe
Lowering the pump position
Both B and C
Q.31
In case of supersonic flow of a fluid through pipeline, the 'Mach number' is
0
1
< 1
> 1
Q.32
Plunger pumps are used for
Higher pressure
Slurries
Viscous mass
None of these
Q.33
Bernoull's equation does not apply to the functioning of a/an
Venturimeter
Orificem
Pitot tube
None of these
Q.34
For turbulent flow in smooth circular pipe, the velocity distribution is a function of the distance 'd' measured from the wall of the pipe and the friction velocity 'v', and it follows a __________ relationship.
Logarithmic
Linear
Hyperbolic
Parabolic
Q.35
The head developed by a centrifugal pump is largely determined by the
Power of the pump
Nature of the liquid being pumped
Angle of the vanes and the speed of the tip of the impeller
Vapour pressure of the liquid
Q.36
Propellers are
Axial flow mixers
Low speed impeller
Used for mixingliquids of high viscosity
Radial flow mixers
Q.37
With diminishing cross-sectional area in case of subsonic flow in a converging nozzle, the
Velocity increases
Pressure decreases
Both A and B
Neither A nor B
Q.38
The velocity distribution in direction normal to the direction of flow in plane Poiseuille flow is
Hyperbolic
Parabolic
Linear
None of these
Q.39
Which of the following is an undesirable property of a manometric liquid?
Non-sticky & non-corrosive nature
High vapour pressure
Low viscosity & surface tension
Low co-efficient of thermal expansion
Q.40
Pick out the wrong statement.
Momentum transfer in laminar flow results from veclocity gradient
A fluid in equilibrium is not free from shear stress
The viscosity of a non-Newtonion fluid is a function of temperature only
Both B and C
Q.41
Steady uniform flow is represented by flow through a/an
Long pipe at constant rate
Long pipe at decreasing rate
Expanding tube at constant rate
None of these
Q.42
Potential flow is the flow of
Compressible fluids with shear
Compressible fluids with no shear
Incompressible fluids with shear
Incompressible fluids with no shear
Q.43
Cavitation occurs in a centrifugal pump when the suction pressure is
Less than the vapour pressure of the liquid at that temperature
Greater than the vapour pressure of the liquid at that temperature
Equal to the vapour pressure
Equal to the developed head
Q.44
Draining of shallow pits or sump is done by a sump pump, which is a __________ pump.
Single stage vertical
Centrifugal
Plunger
Diffuser
Q.45
In which of the following cases, it is possible for flow to occur from low pressure to high pressure?
Flow of liquid upward in a vertical pipe
Flow through a converging section
Flow of air downward in a pipe
Impossible in a constant cross-section conduit
Q.46
The velocity profile for turbulent flow through a closed conduit is
Logarithmic
Parabolic
Hyperbolic
Linear
Q.47
Flow rate of high velocity flue gas discharged through a stack to the atmosphere can be most conveniently measured by a
Pitot tube
Manometer
Rotameter
None of these
Q.48
A fluid element has a velocity V = -y² . xi + 2yx² . j. The motion at (x, y) = (l/√2, 1) is
Rotational and incompressible
Rotational and compressible
Irrotational and compressible
Irrotational and incompressible
Q.49
The velocity for subsonic flow in a pipeline
Increases in the downstream direction
Is constant
Decreases in the downstream direction
Is independent of the area of flow
Q.50
What is the value of co-efficient of discharge for square edged circular orifice (for β = 0.3 to 0.5)?
0.61 - 0.63
0.5 - 0.75
0.75 - 0.90
0.35 - 0.55
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