Chemical Engineering MCQs – Fluid Mechanics MCQs Competitive
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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:
Capacity of a rotary gear pump can be varied by__________________?
A. Bleeding air into suction
B. Changing the speed of rotation
C. Bypassing liquid from the suction or discharge line
D. All A., B. and C.
For laminar flow of a shear thinning liquid in a pipe, if the volumetric flow rate is doubled, the pressure gradient will increase by a factor of_________________?
A. 2
B. 1/2
D. 2
The valve used for very remote and accurate control of fluid is a _____________ valve?
A. Needle
B. Gate
C. Globe
D. Butterfly
If three pipes of different diameters, lengths & friction factors are connected in parallel, then (where, Q = flow rate, V= fluid velocity f = friction factor). ?
A. Q = Q1 + Q2 + Q3
B. Q1 = Q2 = Q3
C. V1 = V2 = V3
D. f = f1 + f2 + f3
Drag co-efficient CD, in Stoke’s law range is given by________________?
A. CD = 18.4/Re.p
B. CD = 24/Re.p
C. CD = 16/Re.p
D. CD = 0.079/Re.p
Design of the casing of centrifugal pump should be such as to minimise the________________?
A. Loss of static head
B. Loss of kinetic head
C. Back flow through impeller
D. None of these
Quicksand is an example of a __________ fluid?
A. Newtonian
B. Dilatant
C. Bingham plastic
D. Pseudo plastic
The fluid velocity varies as the cube of the cylindrical pipe diameter in case of steady state laminar flow at constant pressure drop for ____________ fluid?
A. Dilatent
B. Pseudo-plastic
C. Newtonian
D. Bingham plastic
The peripheral velocity at inlet of a centrifugal pump having inlet diameter of 25 cms and rotating at 950 rpm is __________ m/sec?
A. 186.2
B. 12.4
C. 1.8
D. 736.4
Hot wire anemometer is used to measure the_________________?
A. Temperature of liquids
B. Velocity of liquids
C. Velocity of gases
D. Pressure of liquids
The pressure intensity is the same in all directions at a point in a fluid________________?
A. Only when the fluid is at rest having zero velocity
B. Only when the fluid is frictionless
C. When there is no motion of one fluid layer relative to an adjacent layer
D. Regardless of the motion of one fluid layer relative to an adjacent layer
Hydraulic mean radius for flow through packed bed of spherical particle of size, ‘Dp, with porosity ‘ε’ is________________?
A. (Dp/6) (ε/1- ε)
B. ⅔Dp (1- ε/ε)
C. (Dp/6) (1- ε/ε)
D. ⅔Dp (ε/1- ε)
Gradually varying fluid flow is an example of ____________ flow?
A. Non-steady uniform
B. Steady uniform
C. Non-steady non-uniform
D. Steady non-uniform
The head loss in turbulent flow in pipe is proportional to(where, V = velocity of fluid through the pipe) ?
A. V2
B. 1/V
C. 1/V2
D. V
Prandtl number is a measure of the__________________?
A. Heat conduction to viscosity of a fluid
B. Elastic force to pressure force in the fluid flow
C. Cp/Cv of a fluid
D. Inertial force to elastic force in the fluid flow
Potential flow is the flow of______________?
A. Compressible fluids with no shear
B. Compressible fluids with shear
C. Incompressible fluids with shear
D. Incompressible fluids with no shear
Weber number is the ratio of inertial force to _____________ force?
A. Surface tension
B. Viscous
C. Gravity
D. Elastic
In case of Couette flow, the fluid flow is between two large flat parallel plates with___________________?
A. Top plate moving and the bottom plate fixed
B. Bottom plate moving and the top plate fixed
C. Both the plates moving
D. Both the plates fixed
Dimension of kinematic viscosity is_____________________?
A. L2T
B. L2T-1
C. MLT-1
D. L2T-2
Multistage compressors are used in industry, because they____________________?
A. Reduce the size requirement
B. Reduce the cost of compressor
C. Resemble closely to isothermal compression
D. Are easy to control
Furnace Technology Mcqs
Hydraulic _____________ works on the principle of Pascal’s law of transmission of fluid pressure?
A. Press
B. Pump
C. Turbine
D. Coupling
The discharge through a semi-circular weir varies as (where, H = Head of liquid.) ?
A. H3/2
B. H2
C. H
D. H1/2
Piezometric head is the sum of the ______________ heads?
A. Kinetic energy & pressure
B. Elevation & pressure
C. Elevation & kinetic energy
D. None of these
Which of the following exemplifies a three dimensional fluid flow ?
A. Fluid flow at the inlet to a nozzle
B. Viscous fluid flow between converging plates
C. Fluid flow between parallel plates
D. None of these
f = 16/NRe, is valid for__________________?
A. Laminar flow through an open channel
B. Turbulent flow
C. Steady flow
D. None of these
Which law is followed by the velocity distribution in the turbulent boundary layer ?
A. Linear law
B. Parabolic law
C. Logarithmic law
D. None of these
In case of turbulent flow of a Newtonian fluid in a straight pipe, the maximum velocity is equal to (where, Vavg = average fluid velocity)?
A. 1.5 Vavg
B. 1.2 Vavg
C. Vavg
D. 1.8 Vavg
Unsteady non-uniform flow is represented by flow through a/an_________________?
A. Long pipe at decreasing rate
B. Long pipe at constant rate
C. Expanding tube at increasing rate
D. Expanding tube at constant rate
Slugging occurs in a fluidised bed, if the bed is___________________?
A. Deep
B. Narrow
C. Both A. & B.
D. Neither A. nor B.
The curve of metacentre for a floating body ____________ the curve of buoyancy?
A. Is tangential to
B. Is the evolute of
C. Intersects at right angle
D. Is always below
What is the ratio of total kinetic energy of fluid passing per second to the value obtained on the basis of average velocity (for laminar flow through a circular pipe) ?
A. 0.5
B. 1.5
C. 1
D. 2
Erosion and pits formation on the impeller of a centrifugal pump may be due to________________?
A. Cavitation
B. Off centering of pump with motor
C. Its operation with delivery valve closed for considerable time after starting the pump
D. Low speed of impeller
Cavitation occurs in a centrifugal pump when the suction pressure is________________?
A. Less than the vapour pressure of the liquid at that temperature
B. Greater than the vapour pressure of the liquid at that temperature
C. Equal to the developed head
D. Equal to the vapour pressure
Propellers are____________________?
A. Axial flow mixers
B. Radial flow mixers
C. Used for mixing liquids of high viscosity
D. Low speed impeller
The range of a particular Rotameter can be increased by__________________?
A. Use of floats of different densities
B. No means
C. Decreasing the diameter of the float
D. Increasing the diameter of the float
The value of critical Reynolds number for pipe flow is_________________?
A. 1,300
B. 100,000
C. 10,000
D. None of these
The contraction co-efficient for Borda’s mouthpiece (for frictionless fluid) is__________________?
A. 0.94
B. 0.5
C. 0.1
D. 1
In a stabilised soap bubble, pressure inside it compared to external pressure is________________?
A. More
B. Same
C. Less
D. Unpredictable
Volute of a centrifugal pump should be designed in a fashion, such that the________________?
A. Kinetic head gets converted into static head
B. Mean velocity remains constant
C. Moving stream gradually reduces velocity
D. None of these
For a stable equilibrium of a submerged body (where, G and B are centres of gravity & buoyancy respectively) ?
A. B & G coincide
B. B is above G
C. G is above B
D. None of these
Which of the following has the maximum compression ratio ?
A. Compressor
B. Blower
C. Vacuum pump
D. Fan
A mixed flow centrifugal pump_______________________?
A. Employs such an impeller, through which the flow is a combination of radial & axial flow
B. Pumps the two fluids separately and then mixes them
C. Mixes the two fluids before pumping them
D. Employs impellers in both the radial & axial directions
A compressor that takes suction at a pressure below atmospheric and discharge against atmospheric pressure is called a ____________ pump?
A. Volute
B. Sump
C. Vacuum
D. Submerged
Momentum correction factor used in fluid flow problems accounts for the__________________?
A. Change in direction of flow
B. Change in pressure
C. Change in total energy
D. Non uniform direction of velocities at inlet & outlet sections
Isothermal turbulent flow of a fluid results in decrease of its pressure, which depends on the______________?
A. Reynolds number
B. Wall roughness
C. Both A. & B.
D. Neither A. nor B.
Minimum porosity for fluidisation is____________________?
A. That corresponding to completely fluidised bed
B. That corresponding to static bed
C. The porosity of the bed when true fluidisation begins
D. Less than that of the’ static bed
In area meter (e.g., Rotameter), with increase in the fluid flow rate, the___________________?
A. Area through which fluid flows does not vary
B. Pressure drop is almost constant
C. Pressure drop increases linearly
D. None of these
In case of a centrifugal pump, the theoretical head developed is dependent on the _____________ the impeller?
A. Diameter of
B. Speed of
C. Fluid velocity leaving
D. All A., B. and C.
Fluid Mechanics Mcqs
Terminal velocity is_____________________?
A. A constant velocity with no acceleration
B. Attained after moving one-half of total distance
C. A fluctuating velocity
D. None of these
Drag co-efficient for motion of spherical particles in a stationary fluid in the stoke’s law range is_________________?
A. 24/NRe,P
B. 64/NRe,P
C. 16/NRe,P
D. 48/NRe,P
In power law, δ = [A (du/dy)2 + B] then the fluid is__________________?
A. Newtonian
B. Thixotropic
C. Dilatant
D. Rheopectic
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, in actual operation, the above bed has a height = 1 m. What is the porosity of the fluidised bed ?
A. 0.5
B. 0.2
C. 0.7
D. 0.8
A rectangular surface 3′ × 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) ?
A. 49.2y
B. 48y
C. 39.6y
D. 58y
What is the unit of kinematic viscosity in SI unit ?
A. M2/sec
B. Kg. sec/m
C. N/m2. sec
D. None of these
Umf is the minimum fluidisation velocity for a bed of particles. An increase in the superficial gas velocity from 2 Umf to 2.5 Umf results in (all velocities are smaller than the entrainment velocity of the particles) no change in the_______________?
A. Drag on column walls
B. Drag on particles
C. Bed height
D. Bed voidage
The main factor on which the behaviour of a mass of fluidised solid depends mainly is the___________________?
A. Particle size
B. Fluid characteristics
C. Both A. and B.
D. Neither A. nor B.
Curve III in the bellow diagram represents a/an________________?
A. Ideal plastic
B. Pseudo plastic fluid
C. Dilatent fluid
D. None of these
The capacity of a centrifugal pump Can be increased by increasing the_________________?
A. Number of pumps and joining them in series
B. Impeller diameter or speed
C. Number of pumps and joining them in parallel
D. All A., B. and C.
The unit of velocity head is_________________?
A. ft-lb/ft3
B. ft-lb/sec
C. ft-lbf/lb
D. ft-lbf/sec
Disc compensators are provided in large diameter fuel gas carrying pipelines to_________________?
A. Make the pipe joint leak-proof
B. Keep the pipe in proper orientation
C. Account for contraction/expansion of pipe due to temperature changes of the surroundings
D. Account for the pressure variation side the pipeline
For a given Reynolds number, in a hydraulically smooth pipe, further smoothening ____________ the friction factor?
A. Brings about no further reduction of
B. Decreases
C. Increases
D. None of these
Horsepower requirement for given pump capacity depends upon the_______________?
A. Specific gravity of the liquid
B. Discharge head
C. Suction lift
D. All A., B. and C.
The buoyant force acting on a floating body is dependent on the _______________?
A. Depth of immersion of the body
B. Weight of the liquid displaced
C. Viscosity of the liquid
D. Surface tension of the liquid
Which of the following is used for pumping crude oil from oil well ?
A. Gear pump
B. Single stage centrifugal pump
C. Screw pump
D. Duplex/triplex reciprocating pump
A stream line is___________________?
A. Fixed in space in steady flow
B. Drawn normal to the velocity vector at every point
C. Always the path of particle
D. A line connecting the mid points of flow cross-section
Froude number is the ratio of__________________?
A. Drag stress to shear stress
B. Shear stress to gravitational stress
C. Inertial stress to shear stress
D. Inertial stress to gravitational stress
Hydraulic diameter for non-circular ducts is equal to ___________ times the area of flow divided by the perimeter?
A. Three
B. Two
C. Four
D. Eight
Propeller type centrifugal pumps are most suitable for__________________?
A. Low capacity at high heads
B. High capacity at low heads
C. High capacity at high heads
D. Low capacity at low heads
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 ?
A. < 0.3
B. 50
C. > 3
D. 1
A hydraulic press has a ram of 10 cms in diameter and a plunger of 1 cm in diameter. The force required on the plunger to raise a weight of 10 tons on the ram is _____________ kg?
A. 1000
B. 100
C. 10
D. 10000
Power number is the ratio of____________________?
A. Drag stress to inertial stress
B. Inertial stress to gravitational stress
C. Inertial stress to drag stress
D. Gravitational stress to drag stress
A centrifugal pump has the following specifications: Power = 4 H.P.; Speed = 800 rpm Head = 8 metres Flow = 1000 litres/minutes. If its speed is halved, the power consumed now will be _____________ hp?
A. 0.5
B. 4
C. 2
D. 1
A Newtonian fluid is that__________________?
A. Which needs a minimum shear, before it starts deforming
B. Which follows Newton’s law of motion
C. For which shear & deformation are related as T = μ (∂u/∂y)
D. None of these
Bernoulli’s equation accounts for the_____________________?
A. Various masses
B. Various momentums
C. Different forms of mechanical energy
D. None of these
The line of action of the buoyant force acts through the____________________?
A. Centroid of the displaced volume of fluid
B. Centroid of the volume of any floating body
C. Centre of gravity of a submerged body
D. None of these
Pressure drop in a packed bed for laminar flow is given by the ______________ equation?
A. Kozeny-Carman
B. Leva’s
C. Blake-Plummer
D. Fanning friction factor
For an incompressible fluid, the bulk modulus of elasticity is____________________?
A. 1 N
B. ∞ N/m2
C. 5 kg/m3
D. 0 N/m
Chemical Heat Transfer Mcqs
Steady non-uniform flow is exemplified by flow through a/an___________________?
A. Long pipe at decreasing rate
B. Long pipe at constant rate
C. Expanding tube at increasing rate
D. Expanding tube at constant rate
The frictional resistance in laminar flow does not depend on the_________________?
A. Area of surface in contact
B. Fluid temperature
C. Flow velocity
D. Pressure of flow
The momentum correction factor for the velocity distribution of laminar flow is____________________?
A. 1.66
B. 1.3
C. 2.5
D. None of these
_____________________ pumps are a group of vacuum pumps ?
A. Hyster
B. Mono
C. Sump
D. Submerged
Differential manometer measures the___________________?
A. Gauge pressure
B. Absolute pressure
C. Pressure difference
D. Pressure gradient
With decrease in particle size to be fluidised by a particular fluid, the operating range of fluidisation velocity___________________?
A. Squeezes
B. Widens
C. Does not change
D. Unpredictable from the data
The length of the tube necessary for the boundary layer to reach the centre of the tube and for fully developed flow to be established is called the _____________ length?
A. Prandtl mixing
B. Transition
C. Equivalent
D. None of these
Diaphragm pumps are used to transport_________________?
A. Liquids
B. Solids
C. Fluids
D. Slurries
Rubber latex is an example of ______________ fluid?
A. Newtonian
B. Dilatants
C. Pseudo plastic
D. Bingham plastic
Discharge from a 24 inch pipe of water at 10 ft/sec will be _____________ ft3/sec?
A. 32.36
B. 7.65
C. 48.22
D. 125.6
For the same flow rate of a fluid, the pressure drop is the least for ____________________?
A. Venturimeter
B. Flow-nozzle
C. Orificemeter
D. Δp is same for all
For laminar flow of Newtonian 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 ) ?
A. √μ
B. 1/μ
C. μ
D. 1/√μ
Pumping of a corrosive liquid is generally preferred to be done by a ______________ pump, as it can be made of a variety of materials including plastics?
A. Sump
B. Gear
C. Positive displacement
D. Piston
The line traced by a single fluid particle as it moves over a period of time is called ______________ line?
A. Equipotential
B. Path
C. Stream
D. None of these
While starting an axial flow pump, its delivery valve should be kept _______________?
A. Open
B. Either open or closed
C. Closed
D. None of these
Which of the following is not an advantage of fluidisation from transfer operation point of view ?
A. Intimate contact of the fluid with all parts of the solid particles
B. Lower fluid pumping power requirement
C. Prevention of particle segregation
D. Minimisation of temperature variation
What is the speed of sound (m/sec) in ordinary water ?
A. 1500
B. 1000
C. 330
D. 3000
Fanning friction factor is equal to (where, fB = Blasius friction factor) ?
A. fB/4
B. 4fB
C. fB/2
D. 2fB
With increase in the ratio of orifice diameter to pipe diameter in case of an orificemeter, the overall pressure loss_______________?
A. Increases
B. Decreases
C. Remain constant
D. Increases linearly
_____________ forces do not act in case of fluid flow ?
A. Vibratory
B. Tensile
C. Elastic
D. Centrifugal
Out of the following flow measuring devices, which one incurs the maximum installation cost as well as pressure loss ?
A. Rotameter
B. Venturimeter
C. Flow nozzle
D. Orificemeter
One dimensional flow implies________________________?
A. Steady uniform flow
B. Flow in a straight line
C. Unsteady uniform flow
D. A flow which does not account for changes in transverse direction
Non-colloidal solution is an example of the _______________ fluid?
A. Dilatent
B. Newtonian
C. Non-Newtonian
D. Pseudo-plastic