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Quiz 5
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Q.1
Which of the following properties of a fluid is responsible for offering resistance to shear?
Surface tension
Viscosity
Specific gravity
All of the above
Q.2
Which of the following is a Newtonian fluid?
Rubber latex
Sewage sludge
Quicksand
Non-colloidal solution
Q.3
Which of the following is used for pumping crude oil from oil well?
Single stage centrifugal pump
Gear pump
Screw pump
Duplex/triplex reciprocating pump
Q.4
When the head pumped against is less than the head of the fluid used for pumping, the usual device is a/an
Ejector
Blower
Injector
Airlift
Q.5
Specific speed for a centrifugal pump is
N√Q/H
3/4
N√Q/H
2/3
N√Q/H
1/4
N√Q/H
Q.6
For laminar flow of Newtonion fluid in a circular pipe, the velocity distribution is a function of the distance 'd' measured from the centre line of the pipe, and it follows a __________ relationship.
Logarithmic
Parabolic
Hyperbolic
Linear
Q.7
For liquid flow through a packed bed, the superficial velocity as compared to average velocity through the channel in the bed is
More
Less
Equal
Independent of porosity
Q.8
Bernoulli's equation describes the
Mechanical energy balance in potential flow
Kinetic energy balance in laminar flow
Mechanical energy balance in turbulent flow
Mechanical energy balance in boundary layer
Q.9
The pump used for irrigation purposes is generally designed for
Large capacity & high head
Large capacity & low head
Small capacity & high head
Small capacity & low head
Q.10
Out of the following flow measuring devices, which one incurs the maximum installation cost as well as pressure loss?
Flow nozzle
Venturimeter
Rotameter
Orificemeter
Q.11
An ideal plastic substance indicates no deformation, when stressed upto yield stress, but behaves like a Newtonion fluid beyond yield stress. Which of the following is an ideal plastic?
Sewage sludge
Rubber latex
Blood
Sugar solution
Q.12
Nominal size of the discharge pipe of a pump is usually __________ the nominal size of the inlet pipe.
Smaller than
Larger than
Same as
Twice
Q.13
Power required for mixing Newtonion fluids is a function of the
Speed of impeller, diameter of impeller & viscosity
Density & viscosity of fluid only
Density of fluid, viscosity of fluid & impeller dia only
None of these
Q.14
In which of the following body shapes, the pressure drag is large compared to the friction drag?
Stream line body
Two dimensional body
Bluff body
None of these
Q.15
A mono pump is a __________ pump.
Centrifugal
Piston
Positive acting rotary
A group of vacuum
Q.16
Air vessel provided in a reciprocating pump
Smoothens the flow by avoiding pulsations
Increases the volumetric efficiency of the pump
Saves the pump from the danger of cavitation
None of these
Q.17
Open channel liquid flow is most conveniently measured by a
Hot wire anemometer
Notch
Rotameter
Segmental orifice
Q.18
Centrifugal pumps as compared to reciprocating pumps
Run at a lower speed for the same discharge
Do not need priming
Deliver fluid with pulsating/fluctuating discharge
Can be run with discharge line valve closed for a short interval
Q.19
Nominal size of a pipe is an indication of its __________ diameter.
Inner
Outer
Approximate
None of these
Q.20
For pumping slurry, one can use a __________ pump.
Reciprocating
Diaphargm
Centrifugal
Pneumatic
Q.21
Which of the following denotes the effect of compressibility in fluid flow?
Weber number
Mach number
Euler number
Reynolds number
Q.22
In the low Reynolds number region, the drag force on a sphere is proportional to
V
V
2
V
4
V
0.5
Q.23
Pick out the wrong statement:
The vacuum pressure is always the negative gauge pressure
The pressure of the liquid measured by a piezometer tube is the gauge pressure
Manometric liquid should have high surface tension
The point at which the resultant pressure on an immersed surface acts, is known as the centre of gravity
Q.24
Which of the following equations is valid for laminar flow of a fluid through packed bed?
Fanning equation
Kozney - Karman equation
Hagen - Poiseuille equation
Blake - Plummer equation
Q.25
Co-efficient of discharge (C
d
) is defined as actual discharge/theoretical discharge and is equal to C
c
. C
v
; where C
c
= Co-efficient of contraction and C
v
= co-efficient of velocity. C
d
of an orifice is usually about
0.42
0.62
0.82
0.98
Q.26
For one dimensional flow of an incompressible fluid in unsteady state in x-direction, the continuity equation is given by
∂u/∂x = 0
∂(ρu)/∂x = 0
∂u/∂x = - ∂ρ/∂t
∂ρ/∂t = 0
Q.27
Velocity head on sudden enlargement in a horizontal pipe is converted into __________ head.
Elevation
Pressure
Both A and B
Neither A nor B
Q.28
Diaphragm valves are used for handling __________ fluids.
Corrosive
Viscous
Non-Newtonion
Solid suspended
Q.29
Equivalent length of a pipe fitting is
Dependent on Reynolds number
Independent of Reynolds number
Dependent on the length of the pipe
None of these
Q.30
Pick out the correct statement pertaining to venturimeter.
A venturimeter with a fixed pressure drop discharges more, when the flow is vertically downward, than when the flow is vertically upward
The co-efficient of contraction of a venturimeter is always unity
For a fixed pressure drop, the discharge of a gas through a venturimeter is greater, when compressibility is taken into account, than when it is neglected
None of these
Q.31
One dimensional flow implies
Flow in a straight line
Steady uniform flow
Unsteady uniform flow
A flow which does not account for changes in transverse direction
Q.32
One horsepower is equal to
550 lbf.ft/second
550 kgf.m/second
Both A and B
550 lbf.ft./hr
Q.33
The ratio of average fluid velocity to the maximum velocity in case of laminar flow of a Newtonion fluid in a circular pipe is
0.5
1
2
0.66
Q.34
Fanning friction factor for laminar flow of fluid in a circular pipe is
Not a function of the roughness of pipe wall
Inversely proportional to Reynolds number
Both A and B
Neither A nor B
Q.35
The distribution of shear stress in a stream of fluid in a circular tube is
Linear with radius for turbulent flow only
Linear with radius for laminar flow only
Linear with radius for both laminar & turbulent flow
Parabolic with radius for both laminar & turbulent flow
Q.36
Pick out the wrong statement:
Greater is the kinematic viscosity of the liquid, greater is the thickness of the boundary layer
Blowers develop a maximum pressure of 2 atmospheres
Friction losses in pipe fittings are generally expressed in terms of velocity heads
Fanning friction factor in case of turbulent flow of liquids in pipe depends upon relative roughness & Reynolds number
Q.37
__________ forces do not act in case of fluid flow.
Elastic
Tensile
Vibratory
Centrifugal
Q.38
Which of the following is not an advantage of fluidisation from transfer operation point of view?
Intimate contact of the fluid with all parts of the solid particles
Lower fluid pumping power requirement
Minimisation of temperature variation
Prevention of particle seggregation
Q.39
With increase in the ratio of orifice diameter to pipe diameter, the fraction of the orifice pressure differential that is permanently lost
Increases
Decreases
Remains unchanged
Increases exponentially
Q.40
Self-priming centrifugal pump can be used for
Booster service
Pumping liquid fertilisers (e.g. liquid NH₃)
Pumping industrial wastes
All of the above
Q.41
Pick out the wrong statement about cavitation.
Sudden reduction of pressure in a fluid flow system caused by flow separation, vortex formation or abrupt closing of valve leads to cavitation
Cavitation may be caused due to boiling of liquid by decreasing the pressure resulting in formation & collapse of vapor cavities
Cavitation begins at higher static pressure and lower velocity in larger diameter pipelines resulting in audible noise
Large scale cavitation can not damage pipeline, restrict fluid flow and damage steam turbine blades
Q.42
The losses in open channel flow generally vary as the
Inverse of the roughness
First power of the roughness
Square of the velocity
Inverse square of hydraulic radius
Q.43
What is the unit of kinematic viscosity in SI unit?
m²/sec
N/m² . sec
Kg . sec/m
None of these
Q.44
Purpose of hydraulic accumulator is to
Ensure intermittant supply of hydraulic pressure
Increase the pressure and store/ accumulate it
Accumulate pressure to increase force
Generate high pressure to operate hydraulic machines like cranes, lifts, presses etc
Q.45
Dimension of absolute viscosity is
ML⁻¹T⁻¹
MLT⁻¹
ML⁻¹T
MLT
Q.46
One dimensional fluid flow implies the
Flow in straight lines only
Uniform flow
Steady uniform flow
Flow in which transverse components are zero
Q.47
Molten soap mass is transported by a __________ pump.
Diaphragm
Reciprocating
Gear
Centrifugal
Q.48
For laminar flow of Newtonion fluids through a circular pipe, for a given pressure drop and length & diameter of pipe, the velocity of fluid is proportional to(where, μ = fluid viscosity )
μ
1/μ
√μ
1/√μ
Q.49
__________ forces act on a particle moving through a stationary fluid.
Gravity
Drag
Buoyant
All of the above
Q.50
Stoke's law is valid, when NN
Re,p
is less than
2
100
2100
700
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