#### Fluid Mechanics MCQs Competitive – Latest Chemical Engineering MCQs

This post is comprising of latest ” **Fluid Mechanics MCQs – Latest Competitive Chemical Engineering MCQs **“. Here you’ll get latest mechanical engineering mcqs for written test, interview with answers. If you want to improve your knowledge regarding mechanical engineering then read these mcqs of Design of Steel Structures.

#### 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:

**Velocity of liquid hydrocarbon fuels in a pipeline cannot be measured by magnetic flowmeters, because their ______________ is very low/small?**

A. Specific gravity **B. Electrical conductivity**

C. Thermal conductivity

D. Electrical resistivity

**The friction factor is___________________?**

A. Not dimensionless

B. Always inversely proportional to the Reynolds number

C. Not dependent on the roughness of the pipe**D. None of these**

**What is the ratio of the velocity at the axis of the pipe to the mean velocity of flow in case of pipe flow under viscous condition ?**

A. 0.67

B. 0.5

C. 1**D. 2**

**Turbine impeller____________________?**

A. Produces only tangential current

B. Produces only radial current **C. Is effective over wide range of viscosities**

D. Does not produce tangential current

**One dimensional fluid flow implies the ________________________?**

A. Uniform flow

B. Flow in straight lines only

C. Steady uniform flow**D. Flow in which transverse components are zero**

**For laminar flow through a closed conduit____________________?**

**A. Vmax = 2Vav**

B. Vmax = 1.5Vav

C. Vmax = Vav

D. Vmax = 0.5Vav

**Each term in Bernoulli‟s equation represents the _____________ of the fluid?**

A. Force per unit mass **B. Energy per unit weight**

C. Energy per unit mass

D. None of these

**For liquid flow through a packed bed, the superficial velocity as compared to average velocity through the channel in the bed is________________?**

A. Equal **B. Less**

C. More

D. Independent of porosity

**The equivalent diameter for pressure drop calculation for a fluid flowing through a rectangular cross-section channels having sides ‘x’ & ‘y’ is given by_________________?**

**A. 2xy/(x + y)**

B. (x + y)/2xy

C. xy/(x + y)

D. (x + y)/xy

**The nominal size of a hose pipe is specified by its _________________?**

**A. I.D.**

B. Thickness

C. O.D.

D. None of these

**An equipotential line is _____________ to the velocity vector at every point?**

**A. Normal**

B. Tangential

C. Parallel

D. None of these

**A Newtonian liquid (ρ = density, μ = viscosity) is flowing with velocity „v‟ in a tube of diameter ‘D’. Let Δp be the pressure drop across the length ‘L’. For a laminar flow, Δp is proportional to_________________?**

**A. Lρv2/D**

B. Dρv2/L

C. LμV/D2

D. μV/L

**In frictional fluid flow, the quantity, (P/ρ) + (V2/2gc) + gz/gc) is___________________?**

A. Increased in the direction of flow **B. Not constant along a streamline**

C. Constant along a streamline

D. None of these

**The fluid jet discharging from a 2″ diameter orifice has a diameter of 1.75″ at its venacontracta. The co-efficient of contraction is___________________?**

A. 0.87 **B. 0.766**

C. 1.3

D. None of these

**For the laminar flow of a fluid in a circular pipe of radius R, the Hagen-Poisseule equation predicts the volumetric flow rate to be proportional to____________________?**

A. R2

B. R **C. R4**

D. R0.5

**Specific speed for a centrifugal pump is___________________?**

**A. N √Q/H3/4**

B. N3D5/H1/3

C. N √Q/H2/3

D. N √Q/H

**Rubber latex is an example of a ______________ fluid?**

**A. Pseudo plastic**

B. Dilatent

C. Bingham plastic

D. Newtonian

**The continuity equation___________________?**

A. Is dependent upon the viscosity of the fluid

B. Is independent of the compressibility of the fluid **C. Represents the conservation of mass**

D. None of these

**The friction factor for turbulent flow in a hydraulically smooth pipe______________?**

**A. Depends only on Reynolds number**

B. Depends on the roughness

C. Does not depend on Reynolds number

D. None of these

**Nominal Pipe Size (NPS) of a pipe less than 12 inches in diameter indicates its________________?**

A. Outer diameter

B. Inner diameter

C. Thickness**D. Neither inner nor outer diameter**

**Capillary tube method of viscosity measurement is based on the ________________?**

**A. Hagen-Poiseuille’s equation**

B. Navier-stokes equation

C. Stoke’s law

D. None of these

**In the low Reynolds number region, the drag force on a sphere is proportional to_______________?**

**A. V**

B. V4

C. V2

D. V0.5

**A fluid which has a linear relationship between the magnitude of applied shear-stress and the resulting rate of deformation is called a/an _____________ fluid?**

**A. Newtonian**

B. Ideal

C. Non-Newtonian

D. Incompressible

**Venturimeter and orificemeter measures the _____________ of the fluid?**

A. Maximum velocity

B. Pressure **C. Average velocity**

D. Point velocity

**Which of the following valves will incur maximum pressure drop for the same discharge of water ?**

A. Gate valve

B. Globe valve **C. Needle valve**

D. Butterfly valve

**At low Reynolds number______________?**

A. Viscous forces control

B. Viscous forces are unimportant **C. Viscous forces control and inertial forces are unimportant**

D. Gravity forces control

#### Process Control And Instrumentation Mcqs

**Transition from laminar flow to turbulent flow is aided by the__________________?**

A. Vibration

B. Surface roughness and curvature (i.e. sharp corners)

C. Pressure gradient and the compressibility of the flowing medium**D. All A., B. & C.**

**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? A. Fluid flow is frictionless & irrotational. B. Fluid flow is steady. C. Fluid flow is uniform & turbulent. D. Fluid is compressible. E. Fluid is incompressible ?**

A. B, D, E

B. A, C, D **C. A, B, E**

D. A, D, E

**The simple Pitot tube does not measure the________________?**

A. Dynamic pressure

B. Static pressure

C. Velocity at the stagnation point**D. All A., B. and C.**

**Specific speed of a centrifugal pump depends upon the ______________ head?**

A. Delivery

B. Suction

C. Manometric**D. None of these**

**Multistage centrifugal pumps are generally used for________________?**

**A. High head**

B. Highly viscous liquid

C. Low head but high discharge

D. Slurries of high solid concentration

**Liquid delivery by centrifugal pump starts, only when the head developed by it is equal to the ____________ head?**

**A. Manometric**

B. Static

C. Total

D. Friction

**Air vessel provided in a reciprocating pump is for__________________?**

A. Decreasing the acceleration head **B. Making the friction in pipe uniform**

C. Increasing the acceleration head

D. None of these

**For water, when the pressure increases, the viscosity_________________?**

A. Decreases

B. Also increases

C. Remain constant**D. First decreases, and then increases**

**Foot valve provided in the pump is a ______________ valve?**

A. Relief **B. Back pressure**

C. Direction control

D. Pressure reduction

**For the production of very high vacuum, a _____________ pump is normally used?**

**A. Diffusion**

B. Jet ejector

C. Centrifugal

D. Piston

**Bernoulli’s equation is dependent on the__________________?**

A. Third law of thermodynamics

B. First law of thermodynamics

C. Law of conservation of momentum**D. None of these**

**Which of the following produces maximum pressure difference for transportation of gases ?**

A. Blowers

B. Vacuum pumps

C. Fans**D. Compressors**

**Pressure difference between two points in vessels, pipelines or in two different pipelines can be measured by a differential manometer. The pressure difference measured as the mm of water column in case of mercury-water, differential manometer is equal to (where, H = difference in height of mercury column in mm)?**

A. 13.6 H **B. 12.6 H**

C. H

D. 14.6 H

**The head loss in turbulent flow in a pipe varies_________________?**

A. Inversely as the square of the velocity

B. Directly as the velocity **C. Approximately as the square of the velocity**

D. Inversely as the square of the diameter

**Navier-Stokes equation is useful in the analysis of _____________ fluid flow problems?**

A. Turbulent **B. Viscous**

C. Non-viscous

D. Rotational

**A pipe has a porous section of length L as shown in the figure. Velocity at the start of this section of V0. If fluid leaks into the pipe through the porous section at a volumetric rate per unit area q(x/L)2, what will be axial velocity in the pipe at any „x‟? Assume incompressible one dimensional flow i.e., no gradients in the radial direction ?**

A. VX = V0 + ⅓q (x3/L2)

B. VX = V0 + q (x3/L2D)

C. VX = V0 + 2q (x2/LD)**D. VX = V0 + (4/3) q (x3/L2D)**

#### Materials And Construction Mcqs

**The hydraulic diameter of an annulus of inner and outer radii Ri and Ro respectively is___________________?**

A. √(Ro-Ri)

B. 4(Ro-Ri) **C. 2(Ro-Ri)**

D. Ro + Ri

**Pressure drop for laminar fluid flow through a circular pipe is given by__________________?**

A. 16/NRe **B. 32 (μLV/gc D2)**

C. 4f (L/D) (v2/2gc) ρ

D. (fLρ/D) (v2/2gc)

**In case of a pipe of constant cross-sectional area, the maximum fluid velocity obtainable is___________________?**

**A. The velocity of sound**

B. Dependent on fluid viscosity

C. Dependent on its cross-sectional area

D. Dependent on fluid density

**Minimum fluidisation velocity for a specific system depends upon the___________________?**

A. Fluid viscosity

B. Particle size

C. Density of both the particle & the fluid**D. All A., B. and C.**

**The equivalent diameter for fluid flow through square cross section channel of side ‘x’, for pressure drop calculation purpose is given by____________________?**

A. 2x

B. 4x **C. x**

D. √x

**The most economical flow control valve for use with large diameter pipes is a__________________?**

**A. Butterfly valve**

B. Needle valve

C. Globe valve

D. None of these

**The lift of a balloon is_________________?**

A. Not dependent on the temperature of the atmosphere **B. Due to the weight of the atmospheric air, that it displaces**

C. Increased, as it rises to a higher altitude

D. None of these

**Unit of mass velocity is__________________?**

A. kg/m2 **B. kg/m2. hr**

C. kg/hr

D. kg/m3. hr

**For an ideal fluid flow, Reynolds number is___________________?**

A. 100

B. 2100

C. 0**D. ∞**

**Permanent pressure loss in a well designed Venturimeter is about _____________ percent of the venturi differential?**

A. 30 **B. 10**

C. 1

D. 50

**The hydraulic radius for flow in a rectangular duct of cross-sectional dimension H, W is___________________?**

A. HW/4 (H + W)2 **B. HW/2 (H + W)2**

C. √(HW/π)

D. 2HW/(H + W)

**When the head pumped against is less than the head of the fluid used for pumping, the usual device is a/an______________________?**

A. Blower

B. Ejector

C. Injector**D. Airlift**

#### Nuclear Power Engineering Mcqs

**Buckingham-π theorem states that in any physical problem including ‘n’ quantities having ‘m’ dimensions, the quantities can be arranged into _____________ independent dimensionless parameters?**

A. n

B. m **C. n-m**

D. n/m

**A globe valve is the most suitable for applications, in which____________________?**

**A. Fluid flow control is required**

B. One way flow is required

C. Valve is required to be either fully open or fully closed

D. Fluid contains dispersed solid particles

**Pick out the wrong statement about cavitation?**

A. Cavitation begins at higher static pressure and lower velocity in larger diameter pipelines resulting in audible noise

B. Cavitation may be caused due to boiling of liquid by decreasing the pressure resulting in formation & collapse of vapor cavities

C. Sudden reduction of pressure in a fluid flow system caused by flow separation, vortex formation or abrupt closing of valve leads to cavitation **D. Large scale cavitation cannot damage pipeline, restrict fluid flow and damage steam turbine blades**

**Pick out the correct statement?**

A. Mach number in an incompressible fluid is always unity

B. The property of a randomly packed bed (with raschig rings) is given by the ratio of the total volume to the volume of voids in the bed

C. Fanning friction factor is inversely proportional to Reynolds number always **D. Mach number is given by the ratio of the speed of the fluid to that of sound in the fluid under conditions of flow**

**Pick out the wrong statement?**

A. The vacuum pressure is always the negative gauge pressure

B. Manometric liquid should have high surface tension

C. The pressure of the liquid measured by a piezometer tube is the gauge pressure **D. The point at which the resultant pressure on an immersed surface acts, is known as the centre of gravity**

**Pick out the wrong statement?**

A. In the equation, T. gc = k. (du/dy)n the value of ‘n’ for pseudoplastic and Dilatant fluid are 1 respectively

B. The shear stress at the pipe (dia = D, length = L) wall in case of laminar flow of Newtonian fluids is (D/4L). Δp

C. Shear stress for Newtonian fluid is proportional to the rate of shear in the direction perpendicular to motion**D. With increase in the Mach number >0.6, the drag co-efficient decreases in case of compressible fluids**

**Pick out the correct statement pertaining to the flow through a converging-diverging tube ?**

A. Throughout the converging portion of the tube, the density increases in the downstream direction **B. No shock wave develops in the tube when the Mach number at exit is greater than unity**

C. The value of Mach number is always unity at the throat

D. None of these

**Pick out the wrong statement ?**

**A. In a static mass of liquid, the pressure at a point is the same for all liquids**

B. Atmospheric pressure = absolute pressure ‒ gage pressure

C. Pressure decreases exponentially with elevation in an isothermal atmosphere

D. As per Pascal’s law, the pressure at a point in a static or uniformly moving fluid is equal in all directions

**Pick out the correct statement?**

**A. A forced vortex occurs when fluid rotates as a solid about an axis**

B. A free vortex occurs, when fluid rotates as a solid

C. In laminar flow, Newton’s law of viscosity does not apply

D. In turbulent flow, there are neither cross-currents nor eddies

**Pick out the wrong statement ?**

A. Momentum transfer in laminar flow results from velocity gradient

B. The viscosity of a non-Newtonian fluid is a function of temperature only

C. A fluid in equilibrium is not free from shear stress **D. Both B. and C.**

**Select the correct statement?**

**A. The discharge through a Venturimeter depends upon Δp only and is independent of orientation of the meter**

B. For a given pressure difference, the discharge of gas is greater through a Venturimeter, when compressibility is taken into account, than when it is neglected

C. A Venturimeter with a given gage difference discharges at a greater rate, when the flow is vertically downward through it, than when the flow is vertically upward

D. The overall pressure loss is the same in a given pipe line, whether a Venturimeter or a nozzle with the same throat dia is used

**Select the wrong statement pertaining to flow of an incompressible fluid through a Venturimeter ?**

A. Discharge of fluid through a Venturimeter depends upon the gage difference irrespective of the orientation of Venturimeter

B. For frictionless flow, the fluid pressure entering the venturi meter will be exactly equal to that leaving the Venturimeter **C. Venturimeter occupies less space than an orificemeter**

D. Venturimeter incurs less power loss compared to an equivalent orificemeter

**Pick out the wrong statement?**

A. Blowers develop a maximum pressure of 2 atmospheres

B. Greater is the kinematic viscosity of the liquid, greater is the thickness of the boundary layer **C. Friction losses in pipe fittings are generally expressed in terms of velocity heads**

D. Fanning friction factor in case of turbulent flow of liquids in pipe depends upon relative roughness & Reynolds number

**Pick out the wrong statement?**

A. The shear stress at any given cross-section of a pipe for steady flow (either laminar or turbulent) varies linearly as the radial distance

B. The form drag is dependent upon the occurrence of a wake **C. An ideal fluid is the one, which has negligible surface tension and obeys the Newton’s law of viscosity**

D. Existence of the boundary layer in fluid flow is because of viscosity of the fluid.

**Pick out the wrong statement about a streamline ?**

**A. It is always parallel to the main direction of the fluid flow**

B. Streamlines intersect at isolated point of zero velocity and infinite velocity

C. It is a line across which there is no flow and it is equivalent to a rigid boundary

D. The fluid lying between any two streamlines can be considered to be in isolation and the streamline spacing varies inversely as the velocity

**Pick out the correct statement?**

A. For a non-Newtonian fluid, a straight line passes through the origin in a plot between shear stress and shear gradient **B. A Newtonian fluid obeys Newton’s law of cooling**

C. Human blood is a Newtonian fluid

D. Thin lubricating oil is an example of a non-Newtonian fluid