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

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

By practicing these MCQs of **Chemical Fluid Mechanics MCQs – Latest Competitive Chemical Engineering MCQs **, an individual for exams performs better than before. This post comprising of mechanical engineering objective questions and answers related to **“**Fluid Mechanics Mcqs **“.** As wise people believe “Perfect Practice make a Man Perfect”. It is therefore practice these mcqs of mechanical engineering to approach the success. Tab this page to check **“Chemical ** **Fluid Mechanics Mcqs”** for the preparation of **competitive mcqs, FPSC mcqs, PPSC mcqs, SPSC mcqs, KPPSC mcqs, AJKPSC mcqs, BPSC mcqs, NTS mcqs, PTS mcqs, OTS mcqs, Atomic Energy mcqs, Pak Army mcqs, Pak Navy mcqs, CTS mcqs, ETEA mcqs** and others.

**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:

**If the head over the triangular notch is doubled, the discharge will increase by ______________ times?**

A. 2.828

B. 2 **C. 5.657**

D. 4

**In open channel flow in a rectangular channel, the ratio between the critical depth and the initial depth, when a hydraulic jump occurs is_________________?**

A. 0.84

B. 0.5 **C. 1.84**

D. 1.25

**Which of the following fluid forces are not considered in the Navier-Stoke’s equation ?**

A. Gravity forces

B. Pressure forces

C. Viscous forces **D. Turbulent forces**

**A lubricant 100 times more viscous than water would have a viscosity (in Pa.s) ?**

A. 1 **B. 0.1**

C. 0.01

D. 10

**Cp/Cv is termed as__________________?**

**A. Adiabatic constant**

B. Weber number

C. Mach number

D. Prandtl number

**____________ is used for measuring the static pressure exerted on the wall by a fluid flowing parallel to the wall in a pipeline?**

A. Pressure gauge

B. Venturimeter **C. Pitot tube**

D. Orificemeter

**Flow measurement in an open channel is done by a/an ________________?**

A. Orificemeter

B. Venturimeter **C. Weir**

D. Rotameter

**Baffles in mixing tanks are provided to__________________?**

**A. Reduce swirling and vortex formation**

B. Aid in rotational flow

C. Increase the structural strength of the tank

D. None of these

**In case of laminar flow of fluid through a circular pipe, the__________________?**

A. Velocity profile varies hyperbolically and the shear stress remains constant over the crosssection **B. Surface of velocity distribution is a paraboloid of revolution, whose volume equals half the volume of circumscribing cylinder**

C. Shear stress over the cross-section is proportional to the distance from the surface of the pipe

D. Average flow occurs at a radial distance of 0.5 r from the centre of the pipe (r = pipe radius)

**Bernoulli’s equation describes the _______________?**

**A. Mechanical energy balance in potential flow**

B. Mechanical energy balance in turbulent flow

C. Kinetic energy balance in laminar flow

D. Mechanical energy balance in boundary layer

**Pick out the correct statement pertaining to Venturimeter ?**

A. For a fixed pressure drop, the discharge of a gas through a Venturimeter is greater, when compressibility is taken into account, than when it is neglected

B. The co-efficient of contraction of a Venturimeter is always unity

C. A Venturimeter with a fixed pressure drop discharges more, when the flow is vertically downward, than when the flow is vertically upward **D. None of these**

#### Plant Economics Mcqs

**Pick out the wrong statement?**

A. The viscosity of gas increases with increase in temperature **B. The eddy viscosity is a fluid property**

C. The eddy viscosity is a function of the type of turbulence involved

D. The viscosity of a liquid increases with decrease in temperature

**Pick out the wrong statement?**

A. Laminar flow of viscous liquids is involved in the lubrication of various types of bearings **B. Newton’s law of viscosity is not applicable to the turbulent flow of fluid with linear velocitydistribution**

C. A fluid mass is free from shearing forces, when it is made to rotate with a uniform velocity

D. Rise of water in capillary tubes reduces with the increasing diameter of capillary tubes

**Pick out the wrong statement ?**

A. A hydrometer used for the determination of specific gravities of liquids works on the principle of buoyant forces

B. Surface tension of a liquid is because of the difference in magnitude of adhesive & cohesive forces **C. In case of unsteady fluid flow, the velocity at any given point does not change with time**

D. Turbulent fluid flow is characterised by the rapid fluctuation of instantaneous pressure & velocity at a point

**Major loss in sudden contraction in pipe flow is due to ________________?**

A. Expansion of flow after sudden contraction **B. Flow contraction**

C. Boundary friction

D. None of these

**What is the value of co-efficient of discharge for square edged circular orifice (for β = 0.3 to 0.5) ?**

**A. 0.61 – 0.63**

B. 0.75 – 0.90

C. 0.5 – 0.75

D. 0.35 – 0.55

**Reciprocating pumps compared to centrifugal pumps__________________?**

A. Can handle slurries more efficiently

B. Deliver liquid at uniform pressure **C. Are not subject to air binding**

D. Can be operated with delivery valve closed

**A fluid (μ/ρ) = 0.01 cm2/sec is moving at critical flow condition (NRe = 2100) through a pipe of dia 3 cms. Velocity of flow is _______________ cm/sec?**

**A. 7**

B. 7000

C. 700

D. 630

**For flow through a venturi at a particular discharge, the correct relationships among velocities at point X, Y and Z would be __________________?**

A. V1 > V2 > V3 **B. V2 > V1 and V2 > V3**

C. V1 < V2 < V3

D. None of these

**The most important factor, which determines the maximum height to which water can be lifted by a pump at standard temperature is the_____________________?**

**A. Barometric pressure**

B. Diameter of the impeller

C. Speed of the impeller

D. Both B. and C.

**Cocks are used to control ___________________?**

A. Solids **B. Any liquid**

C. Water

D. None of these

**Hydraulic radius is the ratio of ____________________?**

A. Flow area to square of wetted perimeter **B. Flow area to wetted perimeter**

C. Wetted perimeter to flow area

D. Square root of flow area to wetted perimeter

**Experimental study of laminar fluid flow through a circular tube was conducted by____________________?**

A. Pascal **B. Hagen and Poiseuille**

C. Reynolds

D. Blake-Plummer

**Which of the following factors does not contribute to the pressure drop in a pipeline ?**

A. Size of pipe

B. Velocity of fluid

C. Length of pipe and number of bends**D. None of these**

**What is the force required (in Newtons) to hold a spherical balloon stationary in water at a depth of H from the air-water interface? The balloon is of radius 0.1 m and is filled with air ?**

**A. 4πg/3**

B. 0.01 πgH/8

C. 0.01 πgH/4

D. 0.04 πgH/3

**Cd for the orifice plate varies from ___________________?**

**A. 0.58 to 0.8**

B. 0.2 to 0.3

C. 0.93 to 0.98

D. 0.02 to 0.03

**Reynolds number is the ratio of____________________?**

A. Viscous forces to inertial forces **B. Inertial forces to viscous forces**

C. Viscous forces to gravity forces

D. Inertial forces to gravity forces

**Friction produced by the formation of wakes is called the ______________ friction?**

A. Skin

B. Disk **C. Form**

D. None of these

**Slugging in a fluidised bed can be avoided by using_____________________?**

A. Deep bed of solids

B. Tall narrow vessel **C. Shallow beds of solids and proper choice of particle size**

D. Very large particles

**Fluid flow in a/an ______________ is an example of pressure flow?**

A. Open channel **B. Pipe**

C. Partially filled pipeline

D. River

**Boundary layer separation is characterised by one of the conditions given below, where ‘Re’ is the Reynolds number for the flow. Select the appropriate conditions ?**

A. Re << 1, decelerating flow

C. Re <> 1, accelerating flow **D. Re >>1, decelerating flow**

**In the Newton’s law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass is ______________ the fluid viscosity?**

A. Independent of **B. Inversely proportional to**

C. Inversely proportional to the square root of

D. Directly proportional to

**The capacity of an accumulator is the maximum_________________?**

**A. Energy which it can store**

B. Liquid which it can store

C. Discharge which it can deliver

D. None of these

**For the manometer set up shown in the figure, the pressure difference PA – PB is given by_________________?**

**A. (ρH – ρair)gH**

B. (ρH – ρL) gL + (ρL – ρair)gH

C. (ρH – ρL) gH + (ρL – ρair) . g(L – H)

D. (ρH – ρL)gH

**In case of a Rotameter, the density of the float material is _____________ that of the liquid it replaces?**

**A. More than**

B. Equal to

C. Less than

D. Either A. or B.

**For turbulent flow in smooth circular pipe, the velocity distribution is a function of the distance ‘d’ measured from the wall of the pipe and the friction velocity ‘v’, and it follows a _____________ relationship?**

**A. Logarithmic**

B. Hyperbolic

C. Linear

D. Parabolic

**Cavitation in a pump creates so many undesirable effects. Out of the following, which is not an undesirable effect created by cavitation ?**

A. Increase in thrust

B. Decrease in effect

C. Develops noise**D. Develops high pressure**

**Cd is always ______________ Cc?**

**A. Greater than**

B. Equal to

C. Less than

D. Either more or less than

#### Materials And Construction Mcqs

**A gas (density = 1.5 kg/m3, viscosity = 2 × 10‒5 kg/m.s) flowing through a packed bed (particle size = 0.5 cm, porosity = 0.5) at a superficial velocity of 2 m/s causes a pressure drop of 8400 Pa/m. The pressure drop for another gas, with density of 1.5 kg/m3and viscosity of 3 × 10‒5kg/m.s flowing at 3 m/s will be________________?**

A. 18900 Pa/m **B. 12600 Pa/m**

C. 8400 Pa/m

D. 16800 Pa/m

**Characteristic curves for a centrifugal pump plotted against its capacity is shown in the diagram. x, y and z denote respectively_______________?**

A. B.H.P., efficiency and head **B. Head, efficiency and B.H.P.**

C. Efficiency, head and B.H.P.

D. Efficiency, B.H.P. and head

**If in a flow field, between any two points, then the flow must be___________________?**

**A. Steady, incompressible, irrotational**

B. Steady, compressible and along a streamline

C. Steady, compressible, irrotational

D. Unsteady, incompressible, irrotational

**Which of the following options will facilitate the achievement of a very high head (say 30 metres) in case of a centrifugal pump ?**

A. Increasing the number of vanes in the impeller

B. Increasing the impeller speed and the volute area **C. Mounting of two or more impellers in series on a single shaft**

D. Either of A., B. or C.

**Working of a _______________ pump characterises mixed flow?**

**A. Turbine**

B. Diaphragm

C. Piston

D. None of these

**Drag co-efficient in hindered settling is _____________ that in free settling?**

A. Equal to

B. Less than

C. Not necessarily greater than**D. Always greater than**

**In case of Venturimeter, friction losses are about _____________ percent of maximum velocity head?**

**A. 2**

B. 8

C. 20

D. 12

**The maximum head that can be developed by a single impeller is _____________ ft?**

A. 100

B. 25 **C. 250-300**

D. 1000

**Location of vena-contracta in an orificemeter does not depend upon the________________?**

**A. Type of orifice**

B. Pipe roughness

C. Ratio of pipe diameter to orifice diameter

D. Density, viscosity & compressibility of the fluid

**Path followed by water jet issuing from the bottom of a water tank will be a__________________?**

**A. Parabola (vertex being at the opening)**

B. Horizontal straight line

C. Hyperbola

D. Zig-zag path (which is geometrically undefined)

#### Nuclear Power Engineering Mcqs

**For flow past a flat plate, if „x‟ is the distance along the plate in the direction of flow, the boundary layer thickness is proportional to________________?**

**A. √x**

B. x

C. 1/√x

D. 1/x

**The unit of bulk modulus of elasticity for a liquid in S.I. unit is____________________?**

A. N/m

B. N **C. N/m2**

D. N/m3

**It is possible to integrate an automatic flow controller to a________________?**

A. Venturimeter

B. Flow nozzle **C. Rotameter**

D. None of these

**Friction factor for a hydraulically smooth pipe at NRe = 2100 is f1. If the pipe is further smoothened (i.e., roughness is reduced), the friction factor at the same value of NRe, will_______________?**

**A. Increase**

B. Remain unchanged

C. Decrease

D. Increase or decrease depending on the pipe material

**The dimension of surface tension is________________?**

A. MLT-2 **B. MT-2**

C. ML-2

D. ML-2T

**N. second/m2 is___________________?**

**A. The S.I. unit of dynamic viscosity**

B. Equivalent to one poise

C. The S.I. unit of kinematic viscosity

D. Equivalent to one stoke

**Water flow rate in a pipe of 3.5 metres diameter can be most economically and conveniently measured by a/an ________________?**

**A. Pitot tube**

B. Orificemeter

C. Venturimeter

D. Rotameter

**Maintenance cost of a ______________ pump for a particular duty is the least?**

**A. Centrifugal**

B. Volute

C. Reciprocating

D. Gear

**With a constant diameter impeller of a centrifugal pump _____________________?**

A. Head varies as the speed **B. Head varies as the square of speed**

C. Horsepower input varies as the square of speed

D. Its capacity varies directly as the square of speed

**Which of the following is an undesirable property of a manometric liquid ?**

A. Low viscosity & surface tension **B. High vapour pressure**

C. Non-sticky & non-corrosive nature

D. Low co-efficient of thermal expansion

**In Newton’s law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass varies as the ______________ of its diameter?**

A. Second power **B. Square root**

C. Inverse

D. First power

**The general relationship between speed N, head H, power P and discharge Q for a centrifugal pump is_________________?**

**A. Q∝N : H∝N2 : P∝N3**

B. Q∝N : H∝N3 : P∝N2

C. Q∝N2 : H∝N3 : P∝N

D. Q∝N3 : H∝N : P∝N2

**A bed consists of particles of density 2000 kg/m3. If the height of the bed is 1.5 metres and its porosity 0.6, the pressure drop required to fluidise the bed by air is_________________?**

A. 14.86 kPa **B. 11.77 kPa**

C. 25.61 kPa

D. 21.13 kPa

**Efficiency of power transmission (ε) through a circular pipe is given by (ht – hf)/ht, which has a maximum value of _____________ percent?**

A. 50

B. 33:3 **C. 66.6**

D. 88.8

**For a reciprocating pump, the indicator diagram is the graph between the________________?**

A. Angle swept by the crank pin at any instant and the discharge **B. Volume swept by piston for one complete revolution and the pressure in the cylinder**

C. Discharge and overall efficiency

D. None of these

**Power requirement of fans having constant wheel diameter varies _____________ fan speed?**

A. Directly as

B. As square of **C. As cube of**

D. None of these

**Which is not a variable head meter _________________?**

A. Pitot tube

B. Venturimeter **C. Rotameter**

D. None of these

**Working principle of manometer comprises of balancing a coloumn of liquid against the pressure to be measured. Inclined tube manometer is especially used for the measurement of ______________ pressure?**

**A. Small differential**

B. Absolute

C. Atmospheric

D. Gage

**Creeping flow around a sphere is defined, when particle Reynolds number is___________________?**

A. > 2.5 **B. < 0.1**

C. < 2100

D. < 500

**During ageing of fluid carrying pipes, the__________________?**

A. Friction factor increases linearly with time

B. Pipe becomes smoother with use

C. Absolute roughness decreases with time**D. Absolute roughness increases linearly with time**

**In fluid flow, the stagnation point is defined as a point, where the _____________ is zero?**

**A. Flow velocity**

B. Total energy

C. Pressure

D. All A., B. and C.

**A hydraulic ram acts as a/an ______________ pump?**

A. Reciprocating

B. Centrifugal **C. Impulse**

D. Parallel cylinder

**Viscosity of water is about _____________ times that of air at room temperature?**

A. 155 **B. 55**

C. 15

D. 1050

**Sewage sludge is an example of the ______________ fluid?**

**A. Bingham plastic**

B. Pseudo plastic

C. Newtonian

D. Dilatent

**The ratio of hydrodynamic boundary layer to thermal boundary layer thickness in case of liquid metals is__________________?**

**A. < 1**

B. > 1

C. 1

D. 2

**High specific speed of a pump implies that, it is a/an _____________ pump?**

A. Mixed flow

B. Centrifugal **C. Axial flow**

D. None of these