Fluid Mechanics MCQs Competitive – Chemical Engineering MCQs
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Latest Chemical Engineering MCQs
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Latest Fluid Mechanics Mcqs
The most occurred mcqs of Fluid Mechanics in past papers. Past papers of Fluid Mechanics Mcqs. Past papers of Fluid Mechanics Mcqs . Mcqs are the necessary part of any competitive / job related exams. The Mcqs having specific numbers in any written test. It is therefore everyone have to learn / remember the related Fluid Mechanics Mcqs. The Important series of Fluid Mechanics Mcqs are given below:
A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun’s equation for the above fluid-particle system (in SI units) is given below : Δ P/L = 375 × 103 VOM + 10.94 × 106 V2 OM (SI units) If water is to be used as the fluidising medium, the minimum fluidisation velocity, VOM is_________________?
A. 24 mm/s
B. 16 mm/s
C. 12 mm/s
D. 28 mm/s
For very low pressure and high discharge rate, the compressor used is a/an ______________ compressor?
A. Reciprocating
B. Axial
C. Rotary
D. None of these
The pressure head on sudden contraction in a horizontal pipe is converted into the _____________ head?
A. Elevation
B. Velocity
C. Both of the above
D. Neither of the above
Rise of liquid in a capillary tube is due to_________________?
A. Adhesion
B. Cohesion
C. Both A. & B.
D. Neither A. nor B.
The excess of the sum of pressure & velocity heads over the vapor pressure of the liquid at the suction is called the___________________?
A. Cavitation sensitivity
B. Net positive suction head (NPSH)
C. Static submergence
D. Priming
Co-efficient of discharge (Cd) is defined as actual discharge/theoretical discharge and is equal to Cc . Cv; where Cc = Co-efficient of contraction and Cv = co-efficient of velocity. Cd of an orifice is usually about__________________?
A. 0.82
B. 0.62
C. 0.42
D. 0.98
The head loss in turbulent flow in a pipe varies________________?
A. Inversely as the velocity
B. As (velocity)2
C. Inversely as the square of diameter
D. As velocity
The fluid property, due to which, mercury does not wet the glass is__________________?
A. Surface tension
B. Cohesion
C. Viscosity
D. Adhesion
The ratio of inertial forces to elastic forces is called the __________ number?
A. Reynolds
B. Mach
C. Weber
D. Euler
Centrifugal compressors compared to reciprocating compressors__________________?
A. Have lower operating costs
B. Have quieter operation
C. Require less space
D. All A., B. and C.
A fluid element has a velocity V = -y2. xi + 2yx2 . j. The motion at (x, y) = (1/√2, 1) is_________________?
A. Irrotational and compressible
B. Rotational and compressible
C. Rotational and incompressible
D. Irrotational and incompressible
A stream tube is that, which has ______________________ cross-section entirely bounded by stream lines?
A. A small
B. Any convenient
C. A circular
D. A large
Applying a pressure drop across a capillary results in a volumetric flow rate ‘Q’ under laminar flow conditions. The flow rate for the same pressure drop, in a capillary of the same length but half the radius is____________________?
A. Q/2
B. Q/8
C. Q/4
D. Q/16
The head developed by a centrifugal pump is largely determined by the____________________?
A. Nature of the liquid being pumped
B. Power of the pump
C. Angle of the vanes and the speed of the tip of the impeller
D. Vapour pressure of the liquid
Priming is needed in a ______________ pump?
A. Gear
B. Reciprocating
C. Centrifugal
D. Diaphragm
The Mach number for hypersonic flow of compressible fluid is____________________?
A. > 1
B. 1
C. > 4
D. < 2
Higher specific speed (200-500) of a centrifugal pump indicates that the pump is of ______________ flow type?
A. Axial
B. Mixed
C. Radial
D. None of these
Furnace Technology Mcqs
Which of the following properties of a fluid is responsible for offering resistance to shear ?
A. Specific gravity
B. Viscosity
C. Surface tension
D. All A., B., and C.
Power required for mixing Newtonian fluids is a function of the _________________?
A. Speed of impeller, diameter of impeller & viscosity
B. Density of fluid, viscosity of fluid & impeller dia only
C. Density & viscosity of fluid only
D. None of these
A mercury (specific gravity = 13.6) manometer connected across an orificemeter fitted in a pipe shows a manometer reading of 2 cms. If the manometer liquid is changed to carbon tetrachloride (specific gravity = 1.6), then for the same flow rate of water the new manometer reading will be _______________ cms?
A. 17
B. 84
C. 42
D. 1.8
In centrifugal pump operation, the cavitation can be eliminated by maintaining suction pressure ______________ the vapor pressure of the liquid at the suction temperature?
A. Equal to
B. Higher than
C. Lower than
D. None of these
A centrifugal pump is called a turbine pump, if it is having a_________________?
A. Rotating vaned volute
B. Vaned diffusion casing
C. Turbine type impeller
D. None of these
The velocity profile exhibited by laminar flow of Newtonian fluids is such that the velocity distribution w.r.t. radius of the circular pipe is a/an ______________ with the apex at the centre line of the pipe?
A. Semi-circle
B. Parabola
C. Hyperbola
D. Semi-ellipse
The hydrodynamic and thermal boundary layers will merge, when ____________________?
A. Prandtl number is one
B. Nusselt number tends to infinity
C. Schmidt number tends to infinity
D. Archimedes number is greater than 10000
The energy equation, E + (p/ρ) + (V2/2g) + gZ = constant (E = internal energy/mass), is applicable to___________________?
A. Isothermal flow of gases
B. Perfect gases only
C. Adiabatic unsteady flow of gases
D. All compressible fluids
A Rotameter works on the principle of _______________ pressure drop?
A. Constant
B. Variable
C. Both of the above
D. Neither of the above
The equivalent diameter for flow through a rectangular duct of width B and height H is___________________?
A. HB/(H + B)
B. HB/2 (H + B)
C. 2HB/(H + B)
D. 4HB/(H + B)
Mass velocity in case of steady flow and through a constant cross-section conduit is independent of the _________________?
A. Pressure
B. Temperature
C. Both A. & B.
D. Neither A. nor B.
Where does the maximum stress occur in case of laminar flow of incompressible fluid in a closed conduit of diameter ‘d’ ?
A. At d/4 from the wall
B. At the centre
C. At the wall
D. At d/8 from the wall
Upto what value of ‘Mach number’, a fluid may be considered as incompressible ?
A. 3
B. 0.3
C. 0.03
D. 10
Velocity distribution for flow between two fixed parallel plates_________________?
A. Varies parabolically across the section
B. Is zero at the plates and increases linearly to the mid-plane
C. Is constant over the entire cross-section
D. None of these
The variable required to be known in correlations used for estimating the horse power of a centrifugal gas compressor and hence its cost is P. Inlet pressure Q. Compressor rpm R. Delivery pressure S. Volumetric flow rate at inlet ?
A. P, Q and R
B. R and S
C. P and R
D. P, Rand S
Differential manometer measures the____________________?
A. Sub-atmospheric pressure
B. Atmospheric pressure
C. Pressure difference between two points
D. None of these
Medium viscosity lubricating oil can be most ideally pumped by a ______________ pump?
A. Vane
B. Centrifugal
C. Piston
D. Plunger
With increase in temperature, the vapor pressure of liquids__________________?
A. Increases
B. Decreases
C. Increases linearly
D. Remain constant
Remote control valve is a _______________ valve?
A. Needle
B. Butterfly
C. Gate
D. Globe
Most of the centrifugal pumps used in chemical plants are usually ____________________ driven?
A. Diesel engine
B. Steam
C. Electric motor
D. Gas turbine
The uniformity of a gas fluidised bed depends upon the _______________ of the solid particles?
A. Surface properties
B. Size
C. Both A. and B.
D. Neither A. nor B.
Permanent loss in a Venturimeter is about ___________ percent of the pressure drop in the upstream cone?
A. 40
B. 10
C. 1
D. 70
Chemical Engineering Basics Mcqs
Mass velocity is independent of temperature & pressure, when the flow is______________________?
A. Steady through changing cross-section
B. Unsteady through unchanged cross-section
C. Steady and the cross-section is unchanged
D. Unsteady and the cross-section is changed
Water hammer in a pipeline results from the____________________?
A. Pressure increase due to closure of a valve resulting in decrease in rate of flow
B. Rapid pressure change due to a rapid change in the rate of flow
C. Bursting of pipelines due to closure by a valve
D. None of these
Kinetic energy of fluid per unit weight represented by the velocity head is given by___________________?
A. ρv2/gc
B. v2/2gc
C. 2v2/gc
D. ρ.v2/2gc
If the discharge of a centrifugal pump is throttled, then its suction lift_______________________?
A. Increases
B. Remains unchanged
C. Decreases
D. Data insufficient to predict
With increase in the shear rate, the apparent viscosity of pseudo-plastic fluids__________________?
A. Remain same
B. Decreases
C. Increases
D. May increase or decrease; depends on the magnitude of shear rate
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 ?
A. Twice as that of A
B. One fourth as that of A
C. Same as that of A
D. Four times as that of A
A piezometer opening measures the _____________ fluid pressure?
A. Total
B. Undisturbed
C. Static
D. Dynamic
The drag co-efficient for a bacterium moving in water at 1 mm/s, will be of the following order of magnitude (assume size of the bacterium to be 1 micron and kinematic viscosity of water to be 10-6m2/s) ?
A. 24
B. 24000
C. 0.24
D. 0.44
For the same terminal conditions and valve size, the pressure drop in a fully opened globe valve as compared to that in a gate valve is___________________?
A. More
B. Equal
C. Less
D. Either A. or B depends on the viscosity of the fluid
Maximum theoretical suction lift for water at 15°C by a centrifugal pump is 34 ft. The same for water at 90°C will be _____________________ ft?
A. 34
B. 40
C. 8
D. 37
The terminal velocity of a particle moving through a fluid varies as dp n. The value of n is equal to _______________ in Stoke’s law regime?
A. 0.5
B. 1
C. 2
D. 1.5
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) ?
A. D = 1840 H0.5/N
B. H = 1840 D0.5/N
C. D = 1840 N/H0.5
D. D = 1840 H/N
Pump used for the transportation of molten sodium in a fast breader reactor is a/an __________ pump?
A. Plunger
B. Reciprocating
C. Electromagnetic
D. Gear
Head developed by a centrifugal pump depends on its___________________?
A. Impeller diameter
B. Speed
C. Both A. and B.
D. Neither A. nor B.
Check valve provided in the discharge line of a centrifugal pump serves the purpose of controlling the_______________?
A. Back flow of fluid in the event of stoppage of pump
B. Flow of liquid during operation of the pump
C. Discharge pressure
D. All A., B. and C.
At high Reynolds number_________________?
A. Inertial forces control and viscous forces are unimportant
B. Inertial forces are unimportant and viscous forces control
C. Viscous forces predominate
D. None of these
Sewage sludge is ______________ type of non-Newtonian fluid?
A. Pseudo plastic
B. Bingham plastic
C. Dilatant
D. None of these
Cavitation can be prevented by________________?
A. Maintaining suction head = developed head
B. Maintaining the suction head sufficiently greater than the vapour pressure
C. Suitably designing the pump
D. Maintaining suction head lower than the vapour pressure
In fluid flow, cavitation is caused, if the____________________
A. Total energy decreases
B. Fluid velocity decreases to zero
C. Both A. and B.
D. Flow pressure approaches its vapor pressure at the prevailing temperature
For the transfer of solution of thick slurry, the pump used is a _____________ pump?
A. Gear
B. Reciprocating
C. Diaphragm
D. Centrifugal
Bed pressure drop in an air fluidised bed of catalyst particles (ρp = 200 kg/m3, Dp = 0.05 cm) of 60 cm bed depth and bed porosity of 0.5 expressed in cm of water (manometer) is________________?
A. 45
B. 60
C. 90
D. 30
Shear stress in a fluid flowing in a round pipe_________________?
A. Remains constant over the cross-section
B. Varies parabolically across the cross-section
C. Is zero at the centre and varies linearly with the radius
D. Is zero at the wall and increases linearly to the centre
Capillary rise of mercury in a small diameter tube is proportional to (where, d = diameter of the tube, ζ = surface tension of mercury)____________________?
A. 1/d
B. d
C. ζ
D. 1/ζ
Hydraulic mean depth (Dm) for a circular pipe of diameter ‘D’ flowing full is 0.25 D. For a circular channel, at Dm = 0.3 D, gives the condition for the maximum ?
A. Flow rate
B. Mean velocity
C. Both a & b
D. Neither a nor b
Fluid Mechanics Mcqs
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________________?
A. 4.4 KPa
B. 3.7 KPa
C. 2.94 KPa
D. None of these
Which of the following denotes the effect of compressibility in fluid flow ?
A. Euler number
B. Mach number
C. Weber number
D. Reynolds number
Reynolds number for water flow through a tube of I.D. 5 cm is 1500. If a liquid of 5 centipoise viscosity and 0.8 specific gravity flows in the same pipe at the same velocity, then the pressure drop will______________________?
A. Increase
B. Remain same
C. Decrease
D. Data insufficient to predict pressure drop
The ratio of the depth of flow to the hydraulic radius for the most economical trapezoidal section, in open channel flow is_____________________?
A. 1
B. 0.5
C. 1.5
D. 2
Which of the following equations as suggested by Colebrook and White gives the increase in roughness of a new surface (ε0) with age/time (t) (where, ε = roughness of the surface after time’t’. α = a co-efficient to be experimentally determined) ?
A. ε = ε0 + α.t
B. ε = ε0 + α.t3
C. ε = ε0 + α.t2
D. ε = ε0 + α.t4
______________ pumps are axial flow pumps?
A. Diffuser
B. Propeller
C. Turbine
D. None of these
In a fully turbulent flow (Re > 105) in a pipe of diameter ‘d’, for a constant pressure gradient, the dependence of volumetric flow rate of an incompressible fluid is_______________?
A. d2
B. d
C. d2.5
D. d4
For a particle settling in water at its terminal settling velocity, which of the following is true ?
A. Drag = buoyancy + weight
B. Weight = buoyancy + drag
C. Buoyancy = weight + drag
D. Drag = weight
Gear pump_________________?
A. Is a positive displacement pump
B. Is a non-positive displacement pump
C. Is a centrifugal pump
D. Can be started with delivery valve closed
Most commonly used joint in the underground pipe lines is the________________?
A. Sleeve joint
B. Flange
C. Coupling
D. Expansion joint
Ratio of pressure and inertia force gives ______________ number?
A. Mach
B. Weber
C. Euler
D. Froude
With increasing flow rate, the hydraulic efficiency of a centrifugal pump__________________?
A. Monotonically decreases
B. Remains constant
C. Decreases and then increases
D. Increases and then decreases
Steady uniform flow is represented by flow through a/an ___________________?
A. Long pipe at constant rate
B. Expanding tube at constant rate
C. Long pipe at decreasing rate
D. None of these
Which of the following is not a dimension-less parameter ?
A. Specific gravity
B. Euler number
C. Fanning friction factor
D. None of these
A fluid is the one, which___________________?
A. Cannot remain at rest under the action of shear force
B. Is incompressible
C. Continuously expands till it fills any container
D. Permanently resists distortion
Brownian movement is prominent in the particle size range of _____________ microns in case of settling of a particle in a fluid?
A. 2 to 3
B. 200 to 300
C. 0.01 to 0.10
D. 100 to 1000
The velocity profile for turbulent flow through a closed conduit is_______________?
A. Logarithmic
B. Hyperbolic
C. Parabolic
D. Linear
Nominal size of a pipe is an indication of its ______________ diameter?
A. Outer
B. Inner
C. Approximate
D. None of these
The fluid in which the shearing stress within it is proportional to the velocity gradient across the sheared section, is called a _____________ fluid?
A. Perfect
B. Newtonian
C. Bingham
D. None of these
With increase in pump speed, its NPSH requirement_________________?
A. Remains unaltered
B. Increases
C. Decreases
D. Can either increase or decrease; depends on other factors
Pressure drag does not depend upon the_________________?
A. Pressure of main flow only
B. Roughness of surface of the body
C. Length of the body in flow direction
D. All A., B. and C.
The exit cone angle in case of a standard Venturimeter is _____________ the entrance cone angle?
A. Smaller than
B. Equal to
C. Greater than
D. Either A. or B.
Molten soap mass is transported by a ______________ pump?
A. Reciprocating
B. Diaphragm
C. Gear
D. Centrifugal
Assuming flow to be laminar, if the diameter of the pipe is halved, then the pressure drop will_______________?
A. Increase
B. Remain same
C. Decrease
D. Be quadrupled
Dimension of surface tension is (where, F = force, L = length) ?
A. FL-1
B. F.L-2
C. F-1. L
D. F-2. L
The schedule number of a pipe is an indication of its_________________?
A. Roughness
B. Size
C. Material density
D. Wall thickness
A fluid is a substance, that_________________?
A. Has to be kept in a closed container
B. Has zero shear stress
C. Is almost incompressible
D. Flows when even a small shear is applied to it
The continuity equation__________________?
A. Relates mass flow rate along a stream tube
B. Stipulates that Newton’s second law of motion must be satisfied at every point in the fluid
C. Relates work and energy
D. None of these
The flow of gas along a pipe in the direction of decreasing pressure causes decrease in its__________________?
A. Velocity
B. Specific volume
C. Viscosity
D. None of these
In case of supersonic flow of a fluid through pipeline, the ‘Mach number’ is__________________?
A. 1
B. 0
C. < 1
D. > 1
Gradually varied flow in open channel is a/an ____________ flow?
A. Unsteady uniform
B. Steady non-uniform
C. Steady uniform
D. Unsteady non-uniform
Stoke’s law is valid, when NRe, p is less than_________________?
A. 2
B. 2100
C. 100
D. 700
Cavitation in a centrifugal pump can be avoided by keeping the__________________?
A. Inlet pressure high
B. Inlet pressure low
C. Outlet pressure low
D. Outlet pressure high
Momentum transfer in laminar flow of fluids results due to the_________________?
A. Density
B. Viscosity
C. Velocity gradient
D. None of these
What is the ratio of fluid carrying capacity of two pipes having diameters d1 and d2 respectively ?
A. d1/d2
B. (d1/d2)0.5
C. (d1/d2)0.8
D. (d1/d2)2
Mach number is important in a fluid flow problem, when the inertia and _____________ forces predominate?
A. Elastic
B. Gravity
C. Viscous
D. None of these
Boundary layer thickness in turbulent flow over a flat plate increases as(where, d = distance from the leading edge.) ?
A. d2/3
B. √d
C. d4/5
D. d1/3