chemical engineering fluid mechanics for chemical chemical engineering Mcqs
601. The bulk modulus of elasticity of a liquid__________________?
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A. Is zero for incompressible liquid

B. Decreases with pressure

C. Is independent of temperature & pressure

D. Increases with pressure
602. 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 ?
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A. 0.94

B. 1.65

C. 0.32

D. 0.64
603. The continuity equation__________________?
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A. Relates mass flow rate along a stream tube

B. Relates work and energy

C. Stipulates that Newtons second law of motion must be satisfied at every point in the fluid

D. None of these

604. Fluid flow in a/an ______________ is an example of pressure flow?
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A. Partially filled pipeline

B. Open channel

C. River

D. Pipe
605. Open channel liquid flow is most conveniently measured by a__________________?
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A. Notch

B. Rotameter

C. Segmental orifice

D. Hot wire anemometer

606. Pick out the Hagen-Poiseuille?s equation ?
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A. 2cD)

B. ?p = 32 (?LV/gc. D2)

C. ?p/L = 150 [(1 ?)/?3]. (?.V0

D. cDp)

E. ?p/L = 1.75 [(1 ?)/?3]. (?V0

F. ?p/? = 4f (L/D) (V2/2gc)

607. Which of the following assumptions enables the Eulers equation of motion to be integrated ?
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A. The continuity equation is satisfied

B. The fluid is non-viscous

C. The fluid is incompressible

D. The flow is rotational and incompressible

608. Which of the following is not concerned with the fluid-particle interaction ?
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A. Galileo number

B. Drag co-efficient

C. Froude number

D. Weber number
609. Various efficiencies of a centrifugal pump are related as (where, ?m = mechanical efficiency ?v = volumetric efficiency. ?ma = manometric efficiency ?o = overall efficiency) ?
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A. ?m = ?v . ?ma

B. ?v = ?m ?ma

C. ?ma ?m ?v = ?o

D. ?ma = ?m ?v

610. Co-efficient of velocity is ___________________ the coefficient of discharge?
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A. Equal to

B. Less than

C. Not related to

D. More than
611. The pump impeller and the turbine runner in a hydraulic torque converter___________________?
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A. None of these

B. Are directly coupled

C. Have different diameters

D. Have the same diameter

612. The ratio of width to depth for the most economical rectangular section in open channel flow is_________________?
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A. 2

B. 1

C. 0.5

D. 1.5

613. For a given Reynold number as d/D for an orifice increases, Cd will (where, d & D are orifice & pipe diameters respectively)?
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A. Either A. or B.; depends on other factors

B. Increase

C. Remain constant

D. Decrease

614. A mono pump is a __________ pump ?
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A. Piston

B. Positive acting rotary

C. Centrifugal

D. A group of vacuum

615. Bernoulli?s equation does not apply to the functioning of a/an__________________?
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A. None of these

B. pitot tube

C. Orificemeter

D. Venturimeter

616. The most suitable flow measuring device for the fluid flow measurement in a very large diameter pipeline is a____________________?
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A. V-notch

B. Pitot tube

C. Kennison nozzle

D. Weir

617. Boundary layer separation occurs when the____________________?
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A. Pressure reaches a minimum

B. Velocity of sound is reached

C. Valve is closed in a pipeline

D. Cross-section of the channel is reduced
618. 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) ?
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A. Vs2/Dp3

B. Vs2/Dp2

C. Vs/Dp3

D. Vs/Dp2
619. The pipe wall thickness is minimum for a pipe of given nominal size having schedule number___________________?
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A. 160

B. 80

C. 40

D. 120

620. Bernoullis equation describes the _______________?
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A. Mechanical energy balance in boundary layer

B. Mechanical energy balance in potential flow

C. Kinetic energy balance in laminar flow

D. Mechanical energy balance in turbulent flow

621. A streamline is_________________?
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A. Always the path of a particle

B. Defined for uniform flow only

C. The line connecting the mid-points of flow cross-sections

D. Drawn normal to the velocity vector at every point
622. Which of the following is not dimension-less ?
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A. Froude number

B. Kinematic viscosity

C. Pressure co-efficient

D. None of these

623. _____________ forces act on a particle moving through a stationary fluid?
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A. Gravity

B. Buoyant

C. All A., B., & C.

D. Drag

624. Specific speed of a centrifugal pump relates it with another pump having the___________________?
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A. Same efficiency

B. Same speed

C. Geometrical similarity

D. Dynamic similarity
625. Fanning equation is given by (?P/?) = 4f (L/D) (v2/2gc). It is applicable to _____________ region flow?
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A. Transition

B. Laminar

C. Turbulent

D. Both B. and C.
626. Working of a _______________ pump characterises mixed flow?
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A. Turbine

B. Diaphragm

C. None of these

D. Piston

627. At a constant speed of the centrifugal pump, it?s _____________ the impeller diameter?
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A. All A., B. and C.

B. Horsepower varies as the cube of

C. Capacity varies directly with

D. Head varies as the square of

628. The velocity distribution in direction normal to the direction of flow in plane Poiseuille flow is_______________________?
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A. None of these

B. Hyperbolic

C. Linear

D. Parabolic
629. The unit of dynamic viscosity in SI unit is__________________?
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A. m2 /sec

B. N/m2

C. m/N. sec

D. kg/m. sec
630. When larger particles e.g., grains are subjected to fluidisation, the corresponding bed produced is termed as the _______________ bed?
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A. Spouted

B. Sluggish

C. Boiling

D. Teeter

631. The speed of sound in an ideal gas varies as the __________________?
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A. Pressure

B. None of these

C. Density

D. Temperature
632. Centre of pressure in an immersed body is ______________ the centre of gravity?
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A. Above

B. Below

C. Either above or below; depends on the liquid density

D. At

633. The co-efficient of drag and lift for an incompressible fluid depends on the_________________?
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A. All A., B. and C.

B. Reynolds number

C. Mach number

D. Froude number

634. If Blasius or Darcy friction factor is f1 then the Fanning friction factor is equal to____________________?
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A. f1/4

B. 4f2

C. 2f1

D. f1/2

635. Stokes law is valid, when NRe, p is less than_________________?
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A. 2100

B. 2

C. 100

D. 700

636. The terminal velocity of a small sphere settling in a viscous fluid varies as the___________________?
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A. Inverse of the fluid viscosity

B. Inverse square of the diameter

C. First power of its diameter

D. Square of the difference in specific weights of solid & fluid

637. Dean number is concerned with the____________________?
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A. Fluid-particle interaction

B. Fluid flow through helical pipes

C. Psychrometry

D. Power consumption in agitated vessels

638. Baffles in mixing tanks are provided to__________________?
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A. None of these

B. Aid in rotational flow

C. Reduce swirling and vortex formation

D. Increase the structural strength of the tank

639. If x is the depth of flow in an open channel of large width, then the hydraulic radius is equal to________________?
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A. x/3

B. x

C. x/2

D. 2x/3

640. The head loss due to sudden expansion is__________________?
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A. (V1 V2)/2gc

B. (V12 V22)/gc

C. (V12 V22)/2gc

D. (V1 V2)2/2gc
641. For pipe flows, head is proportional to __________ at constant capacity(where, D = pipe diameter) ?
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A. 1/D

B. 1/D2

C. 1/D5

D. D2

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

B. Pitot tube

C. Rotameter

D. Orificemeter

643. 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____________________?
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A. R0.5

B. R2

C. R4

D. R

644. Pick out the wrong statement?
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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 Newtons law of viscosity

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

645. Efficiency of power transmission (?) through a circular pipe is given by (ht hf)/ht, which has a maximum value of _____________ percent?
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A. 66.6

B. 88.8

C. 33:03:00

D. 50

646. The friction factor is___________________?
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A. None of these

B. Not dependent on the roughness of the pipe

C. Not dimensionless

D. Always inversely proportional to the Reynolds number

647. Location of vena-contracta in an orificemeter does not depend upon the________________?
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A. Ratio of pipe diameter to orifice diameter

B. Density, viscosity & compressibility of the fluid

C. Type of orifice

D. Pipe roughness

648. The ratio of hydrodynamic boundary layer to thermal boundary layer thickness in case of liquid metals is__________________?
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A. 2

B. > 1

C. < 1

D. 1

649. Specific speed of a centrifugal pump depends upon the ______________ head?
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A. Delivery

B. None of these

C. Manometric

D. Suction

650. For an ideal fluid flow, Reynolds number is___________________?
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A. 2100

B. ?

C. 100

D. 0