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Fluid Mechanics
Quiz 11
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Q.1
What is the co-efficient of contraction, if a fluid jet discharging from a 50 mm diameter orifice has a 40 mm diameter at its vena-contracta?
0.64
1.65
0.32
0.94
Q.2
Two liquids manometer is used for measuring small pressure differences in
Liquids
Gases
Mixture of hydrocarbons
None of these
Q.3
Pick out the wrong statement about a streamline.
It is always parallel to the main direction of the fluid flow
It is a line across which there is no flow and it is equivalent to a rigid boundary
Streamlines intersect at isolated point of zero velocity and infintie velocity
The fluid lying between any two streamlines can be considered to be in isolation and the streamline spacing varies inversely as the velocity
Q.4
The equivalent diameter for fluid flow through square cross section channel of side 'x', for pressure drop calculation purpose is given by
4x
2x
x
√x
Q.5
Which of the following two quantities when same, makes one pipe system equivalent to another pipe system?
Head & discharge
Length & discharge
Length & diameter
Friction factor & diameter
Q.6
Which of the following quantities are computed by using the hydraulic radius for non-circular ducts?
Velocity and relative roughness
Head loss and velocity
Reynold number, relative roughness and head loss
Reynolds number and friction factor
Q.7
The ratio of wall drag to total drag in the Stoke's law range is
0.5
1
1/3
2/3
Q.8
A venturimeter measures the
Velocity head
Pressure
Point velocity
None of these
Q.9
Potential function is applicable only for __________ flow.
Irrotational
Turbulent
Steady
None of these
Q.10
Drag co-efficient for flow past immersed body is the ratio of __________ to the product of velocity head and density.
Shear stress
Shear force
Average drag per unit projected area
None of these
Q.11
The co-efficient of discharge of an orificemeter is a function of
Reynolds number at the orifice
Ratio of orifice dia to pipe dia
Both A and B
None of the above parameters, and has a constant value of 0.61
Q.12
Net positive suction head (NPSH) of a centrifugal pump must be
Greater than the vapour pressure of the liquid
Less than the vapour pressure of the liquid
Equal to the vapour pressure of the liquid
Less than barometric pressure
Q.13
An ideal fluid is
Non-viscous
Incompressible
Both A & B
Neither A & B
Q.14
Sewage sludge is an example of the __________ fluid.
Bingham plastic
Newtonion
Pseudoplastic
Dilatent
Q.15
f = 16/N
Re
, is valid for
Turbulent flow
Laminar flow through an open channel
Steady flow
None of these
Q.16
A fluid is a substance, that
Has to be kept in a closed container
Is almost incompressible
Has zero shear stress
Flows when even a small shear is applied to it
Q.17
A fluid is the one, which
Cannot remain at rest under the action of shear force
Continuously expands till it fills any container
Is incompressible
Permanently resists distortion
Q.18
A relief valve
Provides back pressure for a cylinder
Unloads a pump
Is a directional control valve
None of these
Q.19
A streamline is
The line connecting the mid-points of flow cross-sections
Defined for uniform flow only
Drawn normal to the velocity vector at every point
Always the path of a particle
Q.20
A mixed flow centrifugal pump
Employs such an impeller, through which the flow is a combination of radial & axial flow
Mixes the two fluids before pumping them
Pumps the two fluids separately and then mixes them
Employs impellers in both the radial & axial directions
Q.21
A Newtonion fluid is that
Which follows Newton
Which needs a minimum shear, before it starts deforming
For which shear & deformation are related as T = μ ∂u/∂y
None of these
Q.22
The component of acceleration resulting due to unsteady nature of flow is called __________ acceleration.
Normal
Local
Convective
Tangential
Q.23
The most serious disadvantage of an orificemeter is that
It is not very accurate
It is very costly
Most of the pressure drop is not recoverable
It is not suitable for measuring gas flow
Q.24
For a reciprocating pump, the indicator diagram is the graph between the
Discharge and overall efficiency
Volume swept by piston for one complete revolution and the pressure in the cylinder
Angle swept by the crank pin at any instant and the discharge
None of these
Q.25
A floating/submerged body is always stable, if its centre of gravity
Lies above its centre of buoyancy
And centre of buoyancy coincide
Lies below its centre of buoyancy
Lies above its meta centre
Q.26
The fluid property which matters for fall-ing rain drops to acquire spherical shape is its
Pressure
Height of descend
Viscosity
Surface tension
Q.27
Pump used for the transportation of molten sodium in a fast breader reactor is a/an __________ pump.
Reciprocating
Plunger
Electromagnetic
Gear
Q.28
Mach number is important in a fluid flow problem, when the inertia and __________ forces predominate.
Elastic
Viscous
Gravity
None of these
Q.29
The contraction co-efficient for Borda's mouthpiece (for frictionless fluid) is
0.1
0.5
0.94
1
Q.30
In case of venturimeters, friction losses are about __________ percent of maximum velocity head.
2
8
12
20
Q.31
The curve of metacentre for a floating body __________ the curve of buoyancy.
Is always below
Is the evolute of
Intersects at right angle
Is tangential to
Q.32
At a constant speed of the centrifugal pump . it __________ the impeller diameter.
Capacity varies directly with
Head varies as the square of
Horsepower varies as the cube of
All of the above
Q.33
Slugging occurs in a fluidised bed, if the bed is
Narrow
Deep
Both A & B
Neither A nor B
Q.34
A gas
Signifies absence of density
Can resist shearing action
Is incompressible
Is a supercritical vapor
Q.35
A tube is specified by its
Thickness only
Outer diameter only
Thickness & outer diameter both
Inner diameter
Q.36
The specific speed of a pump is defined as the speed of a unit of such a size, that it
Delivers unit discharge at unit head
Requires unit power for unit head
Delivers unit discharge at unit power
None of these
Q.37
With increase in the schedule number of a pipe of a particular nominal size, the
Wall thickness also increases
I.D. of the pipe decreases
O.D. of the pipe remains constant
All of the above
Q.38
A perfect gas
Does not satisfy PV = nRT
Is incompressible and has zero viscosity
Has constant specific heat
Can't develop shear stresses
Q.39
The schedule number of a pipe is an indication of its
Size
Roughness
Material density
Wall thickness
Q.40
Reciprocating pumps are not able to compete with the centrifugal pump for industrial use, mainly because these pumps have
Very low speeds
Smaller discharge
Higher capital &maintenance cost
High vibrations
Q.41
Nominal Pipe Size (NPS) of a pipe less than 12 inches in diameter indicates its
Inner diameter
Outer diameter
Thickness
Neither inner nor outer diameter
Q.42
In case of isentropic flow, the speed of sound in an ideal gas is proportional to (where M = molecular weight of the gas)
1/√M
√M
1/M
M
Q.43
Fanning friction factor is equal to(where, f
B
= Blassius friction factor).
f
B
/4
f
B
/2
4f
B
2f
B
Q.44
Erosion and pits formation on the impeller of a centrifugal pump may be due to
Cavitation
Low speed of impeller
Its operation with delivery valve closed for considerable time after starting the pump
Off centering of pump with motor
Q.45
Check in a centrifugal pump is
Provided in the discharge line
Generally a globe valve
Provided to prevent liquid from backing up through the pump when the pump is turned off or accidently stops running
All of the above
Q.46
Navier-Stokes equation is useful in the analysis of __________ fluid flow problems.
Non-viscous
Viscous
Turbulent
Rotational
Q.47
In the Newton's law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass is __________ the fluid viscosity.
Directly proportional to
Inversely proportional to
Inversely proportional to the square root of
Independent of
Q.48
Which of the following may be termed as a variable orifice flowmeter?
Rotameter
Pitot tube
V-notch
All of the above
Q.49
An isentropic process is the one, in which
pv = constant
pv
r
= constant
pv
r
= constant, and process is reversible
None of these
Q.50
Actual lift of a pump is always less than the theoretical lift and is limited by the
Specific gravity & temperature of the liquid
Leakage & pressure decreasing at higher elevations
Frictional resistance through pipes, fittings & passages
All of the above
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