Chemical Engineering MCQs – Fluid Mechanics MCQs Competitive

Chemical Engineering MCQs – 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:

The net positive suction head (NPSH) of a centrifugal pump is defined as the sum of the velocity head and the pressure head at the_________________?

A. Suction
B. Discharge
C. Suction minus vapor pressure of the liquid at suction temperature
D. Discharge minus vapor pressure of the liquid at the discharge temperature

Nominal size of the discharge pipe of a pump is usually _____________ the nominal size of the inlet pipe?

A. Smaller than
B. Same as
C. Larger than
D. Twice

Which of the following has the minimum compressibility ?

A. Water at room temperature
B. Oxygen at room temperature
C. Air at room temperature
D. Nitrogen at room temperature

Power loss in an orificemeter is _____________ that in a Venturimeter?

A. Same as
B. Less than
C. More than
D. Data insufficient, cannot be predicted

The unit of dynamic viscosity in SI unit is__________________?

A. kg/m. sec
B. m2 /sec
C. N/m2
D. m/N. sec

The pitot static tube does not measure the _____________ pressure?

A. Total
B. Static
C. Difference in static & dynamic
D. All A., B. and C.

Vena-contracta formed during flow of a liquid through an orificemeter has__________________?

A. Minimum liquid cross-section
B. Minimum velocity of fluid stream
C. More diameter compared to orifice diameter
D. None of these

For Laminar flow through a packed bed, the pressure drop is proportional to (Vs is the superficial liquid velocity and Dp is the particle diameter) ?

A. Vs/Dp2
B. Vs2/Dp3
C. Vs2/Dp2
D. Vs/Dp3

What is the co-efficient of contraction, if a fluid jet discharging from a 50 mm diameter orifice has a 40 mm diameter at its vena-contracta ?

A. 0.64
B. 0.32
C. 1.65
D. 0.94

All pipes of a particular nominal size have the same_________________?

A. Thickness
B. Outside diameter
C. Inside diameter
D. None of these

Purpose of hydraulic accumulator is to_______________?

A. Ensure intermittent supply of hydraulic pressure
B. Accumulate pressure to increase force
C. Increase the pressure and store/ accumulate it
D. Generate high pressure to operate hydraulic machines like cranes, lifts, presses etc

Dimension of absolute viscosity is_________________?

A. ML-1T-1
B. ML-1T
C. MLT-1

The Prandtl Pitot tube measures the__________________?

A. Velocity at a point in the flow
B. Average flow velocity
C. Pressure at a point
D. Pressure difference in pipe flow

A Bingham fluid of viscosity μ = 10 Pa.s and yield stress, η0 = 10 KPa, is shared between flat parallel plates separated by a distance of 10-3 m. The top plate is moving with a velocity of 1 m/s. The shear stress on the plate is________________?

A. 30 KPa
B. 20 KPa
C. 10 KPa
D. 40 KPa

The equation f-0.5 = 4.07 loge (NRe √f)-0.6 is called the ____________?

A. Fanning equation
B. Von-Karman equation
C. Colebrook formula
D. None of these

Laminar flow of a Newtonian fluid ceases to exist, when the Reynolds number exceeds___________________?

A. 1500
B. 2100
C. 4000
D. 3000

For an unstable equilibrium of a floating body (where, M = metacentre.) ?

A. M & G coincide
B. M is below G
C. M is above G
D. None of these

Schedule number of a pipe, which is a measure of its wall thickness, is given by ________________?

A. 1000 P’/S
B. 1000 S/P
C. 100 P’/S
D. 10000 P’/S

Nuclear Power Engineering Mcqs

Steady fluid flow occurs, when the derivative of flow variables satisfy the following condition.

A. ∂/∂s = constant
B. ∂/∂t = 0
C. ∂/∂s = 0
D. ∂/∂t = constant

When the momentum of one fluid is used for moving another fluid, such a device is called a/an______________?

A. Jet pump
B. Acid egg
C. Blower
D. None of these

The velocity profile for a Bingham plastic fluid flowing (under laminar conditions) in a pipe is__________________?

A. Flat
B. Parabolic
C. Flat near the wall and parabolic in the middle
D. Parabolic near the wall and flat in the middle

In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said to have the same hydraulic roughness, when they have equal values of___________________?

A. Absolute roughness
B. Relative roughness
C. Friction co-efficient for flows at equal Reynold number
D. All A., B. & C.

At a constant speed of the centrifugal pump, it‟s _____________ the impeller diameter?

A. Head varies as the square of
B. Capacity varies directly with
C. Horsepower varies as the cube of
D. All A., B. and C.

Foot valves provided in pumps are ____________ valves?

A. Three/four way
B. Relief
C. Pressure reducing
D. Directional control

Which of the following can be used for the direct measurement of volumetric flow rate of slurry ?

A. Orificemeter
B. Venturimeter
C. Rotameter
D. Pitot tube

The dimension of dynamic viscosity is__________________?

A. ML-1T-1
B. LT-2
C. L2T-1
D. ML-1T-2

In case of centrifugal fan or blower, the gas capacity varies as __________________?

A. Speed
B. (Speed)3
C. (Speed)2
D. (Speed)0.5

The maximum delivery pressure of compressors can be upto _____________ atmospheres?

A. 10
B. 250
C. 100
D. 1000

Dean number is concerned with the____________________?

A. Psychrometry
B. Fluid flow through helical pipes
C. Power consumption in agitated vessels
D. Fluid-particle interaction

A pipe is defined as ‘hydraulically smooth’, if the friction factor_________________?

A. Is zero irrespective of the Reynolds number
B. For a given Reynolds number remains constant even on further smoothening of the pipe
C. Is not a function of Reynolds number
D. None of these

The normal stress is the same in all directions at a point in a fluid, when the fluid is__________________?

A. Incompressible
B. Non-viscous
C. Both A. and B.
D. Having no motion of one fluid layer relative to the other

In case of a ____________ the energy of flow is considerably decreased downstream of the machine?

A. Centrifugal pump
B. Turbine
C. Blower
D. Centrifugal fan

Acceleration head in a reciprocating pump_______________________?

A. Decreases the work done during suction stroke
B. Increases the work done during delivery stroke
C. Does not change the work requirement of the pump
D. Increases the work done during suction stroke

With increase in the ratio of orifice diameter to pipe diameter, the fraction of the orifice pressure differential that is permanently lost________________?

A. Remains unchanged
B. Decreases
C. Increases
D. Increases exponentially

In case of isentropic flow, the speed of sound in an ideal gas is proportional to (where, T = absolute temperature) ?

A. 1/T
B. 1/√T
C. √T
D. T

One horsepower is equal to________________?

A. 550 lbf.ft/second
B. 550 lbf.ft./hr
C. Both A. and B.
D. 550 kgf.m/second

An ideal nozzle design aims at________________?

A. Suppressing boundary layer separation
B. Minimising wall friction
C. Both A. & B.
D. Neither A. nor B.

In the laminar boundary layer flow over a flat plate, the ratio (δ/x) varies as: (where, ‘δ’ is the boundary layer thickness and ‘x’ is the distance from the leading edge in the direction of flow)?

A. Re
B. 1/Re
C. √Re
D. Re-1/2

In case of isentropic flow, the speed of sound in an ideal gas is proportional to (where M = molecular weight of the gas) ?

A. 1/√M
B. 1/M
C. √M
D. M

The bulk modulus of elasticity of a liquid__________________?

A. Decreases with pressure
B. Is zero for incompressible liquid
C. Is independent of temperature & pressure
D. Increases with pressure

The most suitable flow measuring device for the fluid flow measurement in a very large diameter pipeline is a____________________?

A. Kennison nozzle
B. Pitot tube
C. Weir
D. V-notch

The terminal velocity of a solid spherical particle falling through a stationary fluid mass in the Stoke’s law range is proportional to the_____________________?

A. Square of particle size
B. Inverse of fluid viscosity
C. Difference in the densities of the particle & fluid
D. All A., B. and C.

The resistance wire used in a hot wire anemometer for conducting electrical current is made of__________________?

A. Chromium
B. Tungsten
C. Copper
D. Aluminium

As the velocity V and thus the Reynolds number of a flow past a sphere increases from very low value, the drag force for Re << 1 ?

A. Increases linearly with V
B. Decreases as V2
C. Decreases linearly with V
D. None of these

The centre of pressure is_________________?

A. Always above the centroid of the area
B. Always below the centroid of the area
C. A point on the line of action of the resultant force
D. At the centroid of the submerged area

The rate of shear versus the shear stress curves are time dependent for _____________ fluid?

A. Rheopectic
B. Thixotropic
C. Both A. & B.
D. Neither A. nor B.

The flow of a liquid through tapering pipe at a constant rate is an example of _______________ flow?

A. Unsteady uniform
B. Steady non uniform
C. Steady uniform
D. Unsteady non uniform

Very small pressure difference (< 5 mm water column) can be most conveniently measured by a/an _____________ manometer?

A. U-tube mercury
B. U-tube water
C. Inclined tube mercury
D. Inclined tube water

In case of a centrifugal pump, the ratio of total delivered pressure to pressure developed with the impeller is called the _____________ efficiency?

A. Manometric
B. Volumetric
C. Mechanical
D. Overall

A fluid whose apparent viscosity increases with shear rate is termed as the _____________ fluid?

A. Viscous
B. Newtonian
C. Dilatant
D. Non-viscous

Cd, Cc and Cv are related (for flow through an orifice) as (where, Cd = discharge co-efficient, Cc = co-efficient of contraction = (area of jet at vena-contracta/area of opening), Cv = co-efficient of velocity = (actual velocity at vena-contracta/theoretical velocity)?

A. Cd = Cv/ Cc
B. Cd = Cc.Cv
C. Cd = Cc/Cv
D. None of these

Materials And Construction Mcqs

A pipe of I.D. 4 m is bifurcated into two pipes of I.D. 2 m each. If the average velocity of water flowing through the main pipe is 5 m/sec, the average velocity through the bifurcated pipes is__________________?

A. 5 √2 m/sec
B. 10 m/sec
C. 20 m/sec
D. 5 m/sec

Pick out the Hagen-Poiseuille‟s equation ?

A. Δp/ρ = 4f (L/D) (V2/2gc)
B. Δp = 32 (μLV/gc. D2)
C. Δp/L = 1.75 [(1 – ε)/ε3]. (ρV02/gcDp)
D. Δp/L = 150 [(1 – ε)/ε3]. (μ.V02/g2cD)

The pressure head of a flow meter remains constant for_________________?

A. Orificemeter
B. Venturimeter
C. Rotameter
D. Pitot tube

Which of the following quantities are computed by using the hydraulic radius for noncircular ducts ?

A. Head loss and velocity
B. Velocity and relative roughness
C. Reynold number, relative roughness and head loss
D. Reynolds number and friction factor

A pressure head of 320 metres of water in meters of CCl4 ( = 1.6) will be__________________?

A. 320
B. 200
C. 100
D. 160

For pipe flows, head is proportional to __________ at constant capacity(where, D = pipe diameter) ?

A. 1/D2
B. 1/D
C. 1/D5
D. D2

Check in a centrifugal pump is________________?

A. Generally a globe valve
B. Provided in the discharge line
C. Provided to prevent liquid from backing up through the pump when the pump is turned off or accidently stops running
D. All A., B. and C.

Reciprocating pumps are not able to compete with the centrifugal pump for industrial use, mainly because these pumps have_____________?

A. Smaller discharge
B. Very low speeds
C. Higher capital &maintenance cost
D. High vibrations

In an incompressible fluid, the density is____________________?

A. Greatly affected only by moderate changes in temperature
B. Greatly affected by moderate changes in pressure
C. Not affected with moderate change in temperature & pressure
D. Sensible to changes in both temperature & pressure

Turbulent flow generally occurs for cases involving__________________?

A. Very narrow passages
B. Highly viscous fluid
C. Very slow motion
D. None of these

The ratio of wall drag to total drag in the Stoke’s law range is_________________?

A. 1/3
B. 1
C. 0.5
D. 2/3

For a given Reynold number as d/D for an orifice increases, Cd will (where, d & D are orifice & pipe diameters respectively)?

A. Increase
B. Decrease
C. Remain constant
D. Either A. or B.;

Speed of sound in an ideal gas depends on its________________?

A. Temperature
B. Specific volume
C. Pressure
D. None of these

Pipes having diameter 14 inches or more are designated by their_________________?

A. Outside diameter
B. Schedule number
C. Inside diameter
D. None of these

The temperature in isentropic flow_______________?

A. Cannot drop and then increase again downstream
B. Depends on Mach number only
C. Does not depend on Mach number
D. None of these

Check valves are used_______________?

A. In bends
B. At high pressure
C. For controlling water flow
D. For unidirectional flow

A double acting reciprocating pump compared to a single acting pump (of almost same size working under same pressure levels) would give almost double___________________?

A. Efficiency
B. Discharge
C. Head
D. None of these

Boundary layer separation is caused by the_________________?

A. Adverse pressure gradient
B. Boundary layer thickness reducing to zero
C. Reduction of pressure to vapour pressure
D. Reduction of pressure gradient to zero

If ‘x’ is the depth of flow in an open channel of large width, then the hydraulic radius is equal to________________?

A. x
B. x/3
C. x/2
D. 2x/3

A differential pressure cell is used for____________________________?

A. Measuring small pressure difference in liquids
B. Measuring small pressure difference in gases
C. Remote recording of pressure difference
D. Measuring the difference of the impact & the static pressure

Which of the following pipe bends will incur the largest head loss ?

A. U-bend
B. 45° bend
C. 30° bend
D. 90° bend

Which of the fluid forces are not considered in the Reynold’s equation of flow ?

A. Turbulent forces
B. Viscous forces
C. Pressure forces
D. Compressibility forces

Bernoulli‟s equation does not apply to the functioning of a/an__________________?

A. Venturimeter
B. pitot tube
C. Orificemeter
D. None of these

Rotary vacuum pumps can reduce the absolute pressure to as low as __________ mm Hg ?

A. 0.1
B. 1
C. 0.01
D. 0.001

In fluid flow, the boundary layer separation cannot occur___________________?

A. In laminar flow
B. At points of abrupt changes in the flow directions
C. In case of boundaries experiencing form drag
D. None of these

Fluid Mechanics Mcqs

If more than two branches of pipes are to be connected at the same point, then use a/an_________________?

A. Union
B. Elbow
C. Tee
D. None of these

Water hammer is caused, when water flowing in a pipe is suddenly brought to rest by closing the valve. The extent of pressure thus produced due to water hammer depends on the___________________?

A. Fluid velocity in the pipe
B. Pipe length
C. Time taken to close the valve
D. All A., B. and C.

A mono pump is a __________ pump ?

A. Piston
B. Centrifugal
C. Positive acting rotary
D. A group of vacuum

For pipes that must be broken at intervals for maintenance, the connector used should be a/an__________________?

A. Union
B. Reducer
C. Tee
D. Elbow

The terminal velocity of a small sphere settling in a viscous fluid varies as the___________________?

A. Inverse square of the diameter
B. Inverse of the fluid viscosity
C. First power of its diameter
D. Square of the difference in specific weights of solid & fluid

A Rotameter through which air at room temperature and atmospheric pressure is flowing gives a certain reading for a flow rate of 100 cc/sec. If helium (molecular weight 4) is used and Rotameter shows the same reading, the flow rate (cc/sec) is__________________?

A. 42
B. 26
C. 269
D. 325

Co-efficient of velocity is ___________________ the coefficient of discharge?

A. Equal to
B. More than
C. Less than
D. Not related to

The inherent characteristic of an equal percentage valve relating flow rate ‘q’ with valve stem movement ‘x’ are described by the equation_________________?

A. dq/dx = K
B. dq/dx = K/q
C. dq/dx = K.q
D. dq/dx = Kq2

The terminal velocity of a particle moving through a fluid varies as dp n. What is the value of n’ for Newton’s law regime ?

A. 0.5
B. 1.5
C. 1
D. 3

Fluidised beds are formed, when the__________________?

A. Pressure forces equal gravity forces
B. Gravity force is less than the fluid friction
C. Fluid friction is zero
D. Sum of the fluid friction and pressure forces is equal and opposite to gravity forces

Which of the following is not concerned with the fluid-particle interaction ?

A. Froude number
B. Drag co-efficient
C. Galileo number
D. Weber number

The ____________ is measured by a piezometric opening?

A. Static pressure
B. Dynamic pressure
C. Total pressure
D. Point velocity

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

For one dimensional flow of an incompressible fluid in unsteady state in x-direction, the continuity equation is given by_______________?

A. ∂u/∂x = 0
B. ∂ρ/∂t = 0
C. (∂u/∂x) = – (∂ρ/∂t)
D. ∂(ρu)/∂x = 0

Absolute viscosity of a fluid is a function of the __________ of the fluid?

A. Motion
B. Shearing stress
C. Pressure & temperature
D. Both B. & C.

A pitched-blade turbine draws ______________ a straight blade turbine?

A. Less power than
B. Same power as
C. More power than
D. Data insufficient to predict

A fluid is pumped at the rate of 10 lb/sec to a height of 55 ft. The horse power required is _____________ hp?

A. 1
B. 5.5
C. 10/55
D. 1/55

In turbulent flow, a rough pipe has the same friction factor as a smooth pipe____________________?

A. Everywhere in the transition zone
B. When the roughness projections are much smaller than the thickness of the laminar film
C. In the zone of complete turbulence
D. When the friction factor is independent of the Reynold’s number

What is the pipe called which lifts water from a reservoir to a greater height than the initial level in the supply reservoir ?

A. Tunnel
B. Siphon
C. Penstock
D. Pressure pipeline

Which of the following assumptions enables the Euler’s equation of motion to be integrated ?

A. The fluid is incompressible
B. The continuity equation is satisfied
C. The fluid is non-viscous
D. The flow is rotational and incompressible

Fluid flow at increasing rate through a diverging pipe is an example of ______________ flow?

A. Non-steady uniform
B. Steady uniform
C. Steady non-uniform
D. Non-steady non-uniform

Pascal’s law is valid, only when the fluid is_____________________?

A. At rest and when the frictionless fluid is in motion
B. At rest
C. Frictionless and at rest
D. None of these

Theoretical head developed by a centrifugal pump does not depend upon the _____________ the impeller?

A. Speed of
B. Radius of
C. Fluid velocity leaving
D. None of these

The dimension of kinematic viscosity is_________________?

A. ML-2T-2
B. L2T-1
C. ML-2T-1
D. None of these

Chemical Engineering MCQs – Fluid Mechanics MCQs Competitive

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