#### 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 fluidin 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. UnsteadyC. 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.**