Latest 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:
Drag force acting on a body does not depend upon the____________________?
A. Velocity of the body
B. Density of the body
C. Density of the fluid
D. Projected area of the body
Re/NFr is called the _____________ number?
A. Archimedes
B. Galileo
C. Brinkman
D. Euler
Centre of pressure in an immersed body is ______________ the centre of gravity?
A. At
B. Below
C. Above
D. Either above or below; depends on the liquid density
The phenomenon occuring during pumping of a liquid solution containing dissolved gases, which may come out of the solution giving rise to gas pockets, is termed as_______________?
A. Sublimation
B. Cavitation
C. Evaporation
D. Stripping
Centrifugal pump is normally classified on the basis of the________________?
A. Impeller blade angle
B. Type of casing
C. rpm
D. Number of blades in impeller
What is the normal range of exit cone angle of a Venturimeter ?
A. 15 to 25
B. 7 to 15
C. 2 to 5
D. >25
The specific speed of a pump is defined as the speed of a unit of such a size, that it__________________?
A. Delivers unit discharge at unit head
B. Delivers unit discharge at unit power
C. Requires unit power for unit head
D. None of these
For ideally incompressible fluid, the Mach number will be __________________?
A. 0
B. 1
C. 1.5
D. 5
Various efficiencies of a centrifugal pump are related as (where, εm = mechanical efficiency εv = volumetric efficiency. εma = manometric efficiency εo = overall efficiency) ?
A. ηma × ηm × ηv = ηo
B. ηm = ηv . ηma
C. ηv = ηm × ηma
D. ηma = ηm × ηv
For flow of fluids through packed bed, the superficial velocity is_________________?
A. Less than the average velocity through channels
B. More than the average velocity through channels
C. Same as the average velocity through channels
D. Dependent on the pressure drop across the bed
Unsteady uniform flow is represented by flow through a/an_________________?
A. Expanding tube at increasing rate
B. Long pipe at decreasing rate
C. Long pipe at constant rate
D. Expanding tube at constant rate
The speed of sound in an ideal gas varies as the __________________?
A. Temperature
B. Density
C. Pressure
D. None of these
Velocity at a certain point in case of streamline flow is_________________?
A. Independent of time
B. Constant
C. Both A. & B.
D. Neither A. nor B.
The discharge co-efficient for an orifice meter does not depend upon the ___________________?
A. Pipe length
B. Pipe diameter
C. Type of orifice & the Reynolds number
D. Ratio of pipe diameter to orifice diameter
For a specific centrifugal air blower operating at constant speed & capacity, the power requirement and pressure vary_______________?
A. Inversely as gas density
B. Directly as gas density
C. Directly as square root of gas density
D. Directly as square of gas density
For the free settling of a spherical particle through a fluid, the slope of, CD-log NRe, plot is____________________?
A. 0.5
B. -1
C. 1
D. -0.5
Euler’s equation of motion states, that at every point, the_________________?
A. Rate of mass outflow is equal to the rate of mass inflow
B. Force per unit mass equals acceleration
C. Fluid momentum is constant
D. None of these
Steady flow occurs, when the__________________?
A. Rate of the velocity change is constant
B. Conditions are the same at the adjacent points at any instant
C. Conditions do not change with time at any point
D. Conditions change steadily with time
Euler’s equation of motion is a statement expressing____________________?
A. Conservation of mass
B. Newton’s first law of motion
C. Conservation of energy
D. Newton’s second law of motion
The pressure drop per unit length of pipe incurred by a fluid ‘X’ flowing through pipe is Δp. If another fluid ‘Y’ having both the specific gravity & density just double of that of fluid ‘X’, flows through the same pipe at the same flow rate/average velocity, then the pressure drop in this case will be__________________?
A. Δp2
B. 2Δp
C. Δp
D. Δp/2
Two dimensional stream function________________?
A. Is constant along an equipotential surface
B. Is constant along a stream line
C. Relates velocity and pressure
D. None of these
Small pressure differences in liquids is measured using a/an__________________?
A. Pitot tube
B. Inclined tube manometer
C. U-tube manometer
D. None of these
Choose the correct set of dimensions of viscosity that are equivalent (where, F, M, L, T are dimensions for force, mass, length and time respectively) ?
A. FL-2T, ML-1T-1
B. ML-1T-3, F-1L2T
C. FLT, ML-1T-1
D. F-1L2T-1, MLT-3
Which of the following two quantities when same, makes one pipe system equivalent to another pipe system ?
A. Head & discharge
B. Length & diameter
C. Length & discharge
D. Friction factor & diameter
The head loss due to sudden expansion is__________________?
A. (V1 – V2)/2gc
B. (V1 – V2)2/2gc
C. (V12 – V22)/2gc
D. (V12 – V22)/gc
Nuclear Power Engineering Mcqs
The discharge through a Venturimeter depends upon _________________?
A. Pressure drop only
B. Co-efficient of contraction only
C. Its orientation
D. None of these
The ratio of the wall drag to the form drag in the Stoke’s law range (for motion of spherical particles in a stationary fluid) is__________________?
A. 1
B. 0.5
C. 2
D. 0.33
Pick out the wrong statement pertaining to fluid flow ?
A. The ratio of average velocity to the maximum velocity for turbulent flow of Newtonian fluid
in circular pipes is 0.5
B. Hagen-Poiseuille equation is applicable to the laminar flow of Newtonian fluids
C. Navier-Stokes equation is applicable to the analysis of viscous flows
D. The Newtonian fluid velocity in a circular pipe flow is maximum at the centre of the pipe
Priming of a centrifugal pump is done to___________________?
A. Develop effective pressure rise by the pump
B. Increase the mass flow rate of fluid
C. Avoid chances of separation inside the impeller
D. None of these
The fluid property which matters for falling rain drops to acquire spherical shape is its__________________?
A. Height of descend
B. Pressure
C. Viscosity
D. Surface tension
Venturimeters, orificemeters and nozzles are used to measure the fluid discharge from a pipeline. The average fluid velocity in a pipeline can be measured by a/an________________?
A. Cup and vane anemometer
B. Hot wire anemometer
C. Weir
D. None of these
A centrifugal pump loses prime after starting. The reason of this trouble may be_____________________?
A. Too high a suction lift
B. Incomplete priming
C. Low available NPSH and air leaks in the suction pipe
D. All A., B., and C.
The kinetic energy correction factor for velocity distribution of laminar flow is_________________?
A. 1
B. 1.66
C. 0.5
D. 2
The co-efficient of drag and lift for an incompressible fluid depends on the_________________?
A. Reynolds number
B. Mach number
C. Froude number
D. All A., B. and C.
The time taken for gravity flow of a fixed volume of liquid (as in Redwood viscometer) is directly proportional to its __________________?
A. Density
B. Ratio of absolute viscosity to density
C. Absolute viscosity
D. Reynolds number
Hydrometer measures the specific gravity of liquids based on the principles of buoyancy. Pycnometer is used to measure the specific gravity of_________________?
A. Liquids
B. Powder & granular solids
C. Low melting point semi-solids
D. All A, B & C
Volume of liquid displaced by a floating body is equivalent to its_________________?
A. Own weight
B. Own volume
C. Submerged weight
D. Submerged volume
The pressure at a point in a fluid is not the same in all directions, when the fluid is viscous and___________________?
A. Moving
B. Cold
C. Static
D. Hot
What causes cavitation in centrifugal pump ?
A. Low barometric pressure
B. High suction pressure
C. Low suction pressure
D. High suction velocity
For motion of spherical particles in a stationary fluid, the drag co-efficient in hindered settling compared to that in free settling is _______________?
A. More
B. Equal
C. Less
D. More or less, depending on the type of particle
Pitot tube measures the ______________ of a fluid?
A. Average velocity
B. Pressure
C. Average flow rate
D. Point velocity
Manometers measure the ______________ pressure?
A. Absolute
B. Difference in
C. Vacuum as well as the atmospheric
D. Gage
Centre of pressure of a plane surface of arbitrary shape immersed vertically in a static mass of fluid________________?
A. Is different for different fluids
B. Is independent of the specific weight of the fluid
C. Lies above the centroid of the plane surface
D. Is at the centroid of the plane surface
Vena-contracta pressure tapping is at a distance _______________ from the position of an orificemeter fitted in a pipe of internal diameter ‘d’ ?
A. 2d
B. 0.5 d
C. d
D. 4d
A special type of liquid transporting device is the diffuser pump, in which _____________ are minimised?
A. Disk friction
B. Bearing losses
C. Shock losses
D. Cavitation
For flow through an orifice from a reservoir, the actual velocity at the vena contracta is given by _________________?
A. Cd √(2gh)
B. C.V. √(2gh)
C. √(2gh)
D. Cc √(2gh)
Specific speed of a centrifugal pump relates it with another pump having the___________________?
A. Dynamic similarity
B. Same speed
C. Same efficiency
D. Geometrical similarity
Isotropic turbulence occurs __________________?
A. Where there is no velocity gradient
B. Only in Newtonian fluids
C. At higher temperatures
D. None of these
A spherical particle is falling slow in a viscous liquid such that Reynolds number is less than 1. Which statement is correct for this situation ?
A. Drag force and gravitational forces are important
B. Drag, gravitational and buoyancy forces are important
C. Inertial and drag forces are important
D. None of the above
Materials And Construction Mcqs
Which of the following is the „Blasius equation‟, relating friction factor to the Reynolds number ?
A. f = 0.079.NRe-0.25
B. f-0.5 = 4.07 loge (NRef)-0.6
C. Both of the above
D. None of the above
In which type of fluid flow, the velocity of flow of fluid changes from point to point in the fluid at any instant ?
A. Unsteady
B. Rotational
C. Turbulent
D. Non-uniform
Draining of shallow pits or sump is done by a sump pump, which is a ______________ pump?
A. Single stage vertical
B. Plunger
C. Centrifugal
D. Diffuser
Each term of the Bernoulli’s equation written in the form, (p/ρ) + (g/gc). Z + (v2/2gc) = constant, represents the total energy per unit ________________?
A. Mass
B. Specific weight
C. Volume
D. None of these
What causes convective acceleration in fluid flow ?
A. Unsteady nature of flow
B. Steep slope in flow
C. Non-uniformity of flow
D. Turbulence in flow
A streamline is_________________?
A. The line connecting the mid-points of flow cross-sections
B. Always the path of a particle
C. Drawn normal to the velocity vector at every point
D. Defined for uniform flow only
With diminishing cross-sectional area in case of subsonic flow in a converging nozzle, the____________________?
A. Pressure decreases
B. Velocity increases
C. Both A. & B.
D. Neither A. nor B.
Deformation drag, which is caused by widespread deformation of fluid around the immersed body____________________?
A. Occurs when NRe is very small
B. Is independent of body length
C. Is primarily a friction drag
D. Depends mainly on cross-sectional shape
The pump impeller and the turbine runner in a hydraulic torque converter___________________?
A. Are directly coupled
B. Have different diameters
C. Have the same diameter
D. None of these
Which of the following is a dimensionless parameter ?
A. Specific weight
B. Angular velocity
C. Kinematic viscosity
D. None of these
When the pipe Reynold’s number is 6000, the flow is generally___________________?
A. Laminar
B. Viscous
C. Turbulent
D. Transition
Consider a centrifugal pump having a specific impeller diameter, fixed impeller speed pumping a liquid of constant density at a particular discharge capacity. With decrease in the capacity of the pump, the _______________ decreases?
A. BHP required by the pump
B. NPSH required
C. Head of the liquid pumped
D. All A., B. and C.
If Blasius or Darcy friction factor is ‘f1’ then the Fanning friction factor is equal to____________________?
A. f1/4
B. 2f1
C. 4f2
D. f1/2
Choking in case of pipe flow means that a___________________?
A. Specified mass flow rate cannot be achieved
B. Restriction in flow cross-section area occurs
C. Valve is closed in the line
D. None of these
The ratio of width to depth for the most economical rectangular section in open channel flow is_________________?
A. 1
B. 0.5
C. 1.5
D. 2
The pipe wall thickness is minimum for a pipe of given nominal size having schedule number___________________?
A. 120
B. 160
C. 80
D. 40
Air vessel provided in a reciprocating pump__________________?
A. Increases the volumetric efficiency of the pump
B. Smoothens the flow by avoiding pulsations
C. Saves the pump from the danger of cavitation
D. None of these
Volute type of casing is provided in a centrifugal pump to___________________?
A. Convert pressure head to velocity head
B. Convert velocity head to pressure head
C. Reduce the discharge fluctuation
D. Increase the discharge
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_________________?
A. 0.3
B. 0.03
C. 0.9
D. 0.66
Net positive suction head (NPSH) of a centrifugal pump must be____________________?
A. Greater than the vapour pressure of the liquid
B. Equal to the vapour pressure of the liquid
C. Less than the vapour pressure of the liquid
D. Less than barometric pressure
Hydraulic intensifier is used for increasing the ___________________?
A. Rate of flow through delivery pipeline of a pump
B. Rate of velocity of liquid supply
C. Intensity of pressure of the liquid
D. Momentum rate through delivery pipe
The equivalent diameter for pressure drop calculation for a duct of square cross-section is given by (where, x = each side of the square duct) ?
A. x
B. √(2x)
C. √(πx)
D. √(x/2)
The ratio of average fluid velocity to the maximum velocity in case of laminar flow of a Newtonian fluid in a circular pipe is_____________________?
A. 0.5
B. 2
C. 1
D. 0.66
Nature of fluid flow during the opening of a valve in a pipeline is_________________?
A. Uniform
B. Unsteady
C. Steady
D. Laminar
Fluid Mechanics Mcqs
Capacity of a hydraulic accumulator is defined in terms of maximum_____________________?
A. Amount of energy stored
B. Rate of falling of ram
C. Flow rate through accumulator
D. Volume available in the cylinder
The continuity equation in ideal fluid flow states that__________________?
A. Net rate of inflow into any small volume must be zero
B. Energy is constant along a streamline
C. Energy is not constant along a streamline
D. There exists a velocity potential
With increase in the temperature, viscosity of a liquid____________________?
A. Remain constant
B. Decreases
C. Increases
D. May increase or decrease; depends on the liquid
The velocity distribution in direction normal to the direction of flow in plane Poiseuille flow is_______________________?
A. Linear
B. Parabolic
C. Hyperbolic
D. None of these
Surge tanks are provided in high pressure water pipelines to___________________?
A. Facilitate easy dismantling of pipeline for cleaning and maintenance
B. Reduce the water hammer
C. Store a definite quantity of water all the time
D. None of these
Mercury is an ideal barometric fluid mainly due to its __________________?
A. Low compressibility
B. High density
C. Low capillary action
D. Very low vapor pressure
The line of action of the buoyant force passes through the centre of gravity of the_______________________?
A. Volume of fluid vertically above the body
B. Displaced volume of the fluid
C. Submerged body
D. Horizontal projection of the body
Which of the following is not dimension-less ?
A. Pressure co-efficient
B. Kinematic viscosity
C. Froude number
D. None of these
Which of the following may be termed as a variable orifice flow-meter ?
A. Rotameter
B. V-notch
C. Pitot tube
D. All A., B. and C.
Open channel liquid flow is most conveniently measured by a__________________?
A. Rotameter
B. Notch
C. Hot wire anemometer
D. Segmental orifice
The Navier-Stokes equation deals with the law of conservation of___________________?
A. Energy
B. Mass
C. Both A. & B.
D. Momentum
While starting a centrifugal pump, its delivery valve should be kept___________________?
A. Opened
B. Closed
C. Either opened or closed; depending on the fluid viscosity
D. Either opened or closed; it does not make any difference
Buoyant force__________________?
A. Depends on the depth of the submergence of the floating body
B. For non-symmetrical bodies is not vertical
C. Depends on the weight of the floating body
D. None of these
The ratio of inertial forces to gravity forces is called the ______________ number?
A. Euler
B. Froude
C. Mach
D. Weber
Boundary layer separation occurs when the____________________?
A. Valve is closed in a pipeline
B. Cross-section of the channel is reduced
C. Pressure reaches a minimum
D. Velocity of sound is reached
Boiler feed water pump is usually a ______________ pump?
A. Gear
B. Reciprocating
C. Multistage centrifugal
D. Diaphragm
The rate of change of moment of momentum represents the ______________ by the fluid?
A. Torque applied
B. Work done
C. Force exerted
D. Power developed
Interstage coolers are provided in a multistage compressor to____________________?
A. Save power in compressing a given volume to a given pressure
B. Achieve the exact delivery pressure
C. Cool the delivered air
D. None of these
When a fluid flows over a solid surface, the___________________?
A. Velocity is not zero at the solid surface
B. Velocity gradient is zero at the solid surface
C. Resistance between the surface & the fluid is lesser as compared to that between the fluid layers themselves
D. Velocity is uniform at any cross-section
The Stoke’s stream function applies to the________________?
A. Ideal/non i viscous fluids only
B. Irrotational flow only
C. Cases of axial symmetry
D. None of these
When larger particles e.g., grains are subjected to fluidisation, the corresponding bed produced is termed as the _______________ bed?
A. Spouted
B. Boiling
C. Sluggish
D. Teeter
The discharge through a V-notch weir varies as___________________?
A. H1/2
B. H3/2
C. H5/2
D. H2/3
For flow through a venturi at a particular discharge, the correct relationships among heads at points X, Y, and Z are__________________?
A. h1 > h2 < h3
B. h2 < h1 < h3
C. h1 > h2 > h3
D. h1 < h2 < h3
_____________ forces act on a particle moving through a stationary fluid?
A. Drag
B. Gravity
C. Buoyant
D. All A., B., & C.
The simple Pitot tube measures the _______________ pressure?
A. Dynamic
B. static
C. Total
D. None of these
Two liquids manometer is used for measuring small pressure differences in___________________?
A. Mixture of hydrocarbons
B. Gases
C. Liquids
D. None of these
Fanning equation is given by (ΔP/ρ) = 4f (L/D) (v2/2gc). It is applicable to _____________ region flow?
A. Transition
B. Turbulent
C. Laminar
D. Both B. and C.