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Fluid Mechanics
Quiz 9
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Q.1
Fluid resistance to shear depends upon its
Rate of transfer of molecular momentum
Cohesion
Both A and B
Neither A nor B
Q.2
Gradually varied flow in open channel is a/an __________ flow.
Steady uniform
Steady non-uniform
Unsteady uniform
Unsteady non-uniform
Q.3
In centrifugal pumps, cavitation occurs, when pressure of the impeller eye or vane becomes
Less than atmospheric pressure
More than liquid vapor pressure
Less than liquid vapor pressure
More than atmospheric pressure
Q.4
A compressor that takes suction at a pressure below atmospheric and discharge against atmospheric pressure is called a __________ pump.
Sump
Volute
Vacuum
Submerged
Q.5
Prandtl number is a measure of the
Heat conduction to viscosity of a fluid
C
p
/C
v
of a fluid
Elastic force to pressure force in the fluid flow
Inertial force to elastic force in the fluid flow
Q.6
Mass velocity is independent of temperature & pressure, when the flow is
Unsteady through unchanged cross-section
Steady through changing cross-section
Steady and the cross-section is unchanged
Unsteady and the cross-section is changed
Q.7
In case of laminar flow of fluid through a circular pipe, the
Shear stress over the cross-section is proportional to the distance from the surface of the pipe
Surface of velocity distribution is a paraboloid of revolution, whose volume equals half the volume of circumscribing cylinder
Velocity profile varies hyperbolically and the shear stress remains constant over the cross-section
Average flow occurs at a radial distance of 0.5 r from the centre of the pipe (r = pipe radius)
Q.8
Normal depth in open channel flow is the depth of flow in the channel
Corresponding to uniform flow
Measured normal to the channel bed
Corresponding to steady flow
None of these
Q.9
Which of the following is not concerned with the fluid-particle interaction?
Drag co-efficient
Froude number
Galileo number
Weber number
Q.10
The buoyant force acting on a floating body is dependent on the
Viscosity of the liquid
Weight of the liquid displaced
Depth of immersion of the body
Surface tension of the liquid
Q.11
Piezometric head is the sum of the __________ heads.
Elevation & kinetic energy
Elevation & pressure
Kinetic energy & pressure
None of these
Q.12
The ratio of the hydraulic radius to the diameter of the channel, for maximum mean velocity of flow in a circular channel, in open channel flow is
0.3
0.9
0.03
0.66
Q.13
The fluid jet discharging from a 2" diameter orifice has a diameter of 1.75" at its vena-contracta. The co-efficient of contraction is
1.3
0.766
0.87
None of these
Q.14
What is the normal range of exit cone angle of a venturimeter?
2 to 5
7 to 15
15 to 25
>25
Q.15
The excess of the sum of pressure & velocity heads over the vapor pressure of the liquid at the suction is called the
Static submergence
Net positive suction head (NPSH)
Cavitation sensitivity
Priming
Q.16
The vent valve provided in a liquid handling centrifugal pump is
Generally a needle valve
Used to release any gases that might be vapour locking the pump
Helpful in easy removal of samples
All of the above
Q.17
Check valve is used for __________ flow.
Very precise control of
Unidirectional
Multidirectional
None of these
Q.18
What causes convective acceleration in fluid flow?
Steep slope in flow
Unsteady nature of flow
Non-uniformity of flow
Turbulence in flow
Q.19
Centrifugal compressors compared to reciprocating compressors
Require less space
Have quieter operation
Have lower operating costs
All of the above
Q.20
For flow of fluids through packed bed, the superficial velocity is
Less than the average velocity through channels
More than the average velocity through channels
Dependent on the pressure drop across the bed
Same as the average velocity through channels
Q.21
Which of the following is dimensionless?
Angular velocity
Fanning friction factor
Specific volume
None of these
Q.22
The pressure co-efficient is the ratio of pressure forces to __________ forces.
Viscous
Inertial
Gravity
Surface tension
Q.23
Upto what value of 'Mach number', a fluid may be considered as incompressible?
0.03
0.3
3
10
Q.24
The head loss due to sudden contraction is proportional to
Velocity
Velocity head
Turbulence
None of these
Q.25
Stoke's equation is valid in the Reynolds number range
0.01 to 0.1
0.1 to 2
2 to 10
10 to 100
Q.26
Air vessel fitted to a reciprocating pump
Increases the work done
Decreases the work done
Causes cavitation
Results in non-uniform discharge
Q.27
A liquid is pumped at the rate of 600 litres using 1000 rpm. If the rpm is changed to 1100, the liquid pumped is __________ litres.
600
660
1.1
60
Q.28
In case of turbulent flow of fluid through a circular pipe, the
Mean flow velocity is about 0.5 times the maximum velocity
Velocity profile becomes flatter and flatter with increasing Reynolds number
Point of maximum instability exists at a distance of 2r/3 from the pipe wall (r = pipe radius)
Skin friction drag, shear stresses, random orientation of fluid particles and slope of velocity profile at the wall are more
Q.29
Boundary layer separation is characterised by one of the conditions given below, where 'Re' is the Reynolds number for the flow. Select the appropriate conditions.
Re << 1, accelerating flow
Re >> 1, accelerating flow
Re << 1, decelerating flow
Re >>1, decelerating flow
Q.30
For the same terminal conditions and fitting size, the least friction loss is incurred in a/an
T-joint
Union
45° elbow
90°bend
Q.31
Bernoulli's equation for fluid flow is derived following certain assumptions. Out of the assumptions listed below, which set of assumptions is used in derivation of Bernoulli's equation ?
1. Fluid flow is frictionless & irrotational.
2. Fluid flow is steady.
3. Fluid flow is uniform & turbulent.
4. Fluid is compressible.
5. Fluid is incompressible.
1, 3, 3
2, 3, 4
1, 2, 4
1, 3, 4
Q.32
For turbulent flow of an incompressible fluid through a pipe, the flow rate Q is proportional to (Δ P)n, where ΔP is the pressure drop. The value of exponent 'n' is
1
0
< 1
> 1
Q.33
The energy loss over a length of pipeline according to Darcy-Weisbach equation for pipe flow is _________ the mean velocity of flow.
Directly proportional to
Directly proportional to square of
Inversely proportional to
Inversely proportional to square of
Q.34
A pitched-blade turbine draws __________ a straight blade turbine.
Less power than
More power than
Same power as
Data insufficient to predict
Q.35
Assuming flow to be laminar, if the diameter of the pipe is halved, then the pressure drop will
Increase
Decrease
Remain same
Be quadrupled
Q.36
Buckingham-π theorem states that in any physical problem including 'n' quantities having 'm' diamensions, the quantities can be arranged into __________ independent dimensionless parameters.
M
N
N-m
N/m
Q.37
Pressure co-efficient is the ratio of pressure forces to __________ forces.
Gravity
Inertial
Viscous
None of these
Q.38
Pascal's law is valid, only when the fluid is
Frictionless and at rest
At rest
At rest and when the frictionless fluid is in motion
None of these
Q.39
Friction factor for a hydraulically smooth pipe at N
Re
= 2100 is f₁. If the pipe is further smoothened (i.e., roughness is reduced), the friction factor at the same value of N
Re
, will
Increase
Decrease
Remain unchanged
Increase or decrease depending on the pipe material
Q.40
A particle A of diameter 10 microns settles in an oil of specific gravity 0.9 and viscosity 10 poise under Stoke's law. A particle B with diameter 20 microns settling in the same oil will have a settling velocity
Same as that of A
One fourth as that of A
Twice as that of A
Four times as that of A
Q.41
A rectangular surface 3' x 4', has the lower 3 edge horizontal and 6' below a free oil surface (sp. gr. 0.8). The surface inclination is 300 with the horizontal. The force on one side of the surface is(where, y = specific weight of water)
39.6y
48y
49.2y
58y
Q.42
With increase in the shear rate, the apparent viscosity of pseudoplastic fluids
Increases
Decreases
Remains same
May increase or decrease; depends on the magnitude of shear rate
Q.43
The ratio of the depth of flow to the hydraulic radius for the most economical trapezoidal section, in open channel flow is
0.5
1
1.5
2
Q.44
The fluid property, due to which, mercury does not wet the glass is
Surface tension
Viscosity
Cohesion
Adhesion
Q.45
Sewage sludge is __________ type of non-Newtonion fluid.
Dilatant
Bingham plastic
Pseudo plastic
None of these
Q.46
__________ pumps are axial flow pumps.
Turbine
Propeller
Diffuser
None of these
Q.47
Horsepower increase of a centrifugal gas compressor without altering the volumetric flow rate will __________ the gas discharge pressure.
Increase
Decrease
Not change
Exponentially decrease
Q.48
Viscosity of a liquid decreases __________ with rise in temperature.
Exponentially
Linearly
Logarithmically
None of these
Q.49
In isotropic turbulence, the __________ are equal to each other.
Temporal velocity components
Mean square of velocity fluctuations in the three co-ordinate directions
Root mean square of velocity fluctuations in the three co-ordinate directions
None of these
Q.50
Two piping system are said to be equivalent, when the __________ are same.
Length & friction factor
Fluid flow rate & friction loss
Diameter & friction factor
Length & diameter
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