chemical engineering fluid mechanics for chemical chemical engineering mcqs to prepare for nts, kppsc, fpsc, ppsc and more

chemical engineering fluid mechanics for chemical chemical engineering Mcqs

451. 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) ?
0

A. FL-2T, ML-1T-1

B. FLT, ML-1T-1

C. F-1L2T-1, MLT-3

D. ML-1T-3, F-1L2T

452. Power loss in an orificemeter is _____________ that in a Venturimeter?
0

A. Data insufficient, cannot be predicted

B. Less than

C. Same as

D. More than

453. In case of laminar flow of fluid through a circular pipe, the__________________?
0

A. Surface of velocity distribution is a paraboloid of revolution, whose volume equals half the

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

C. ume of circumscribing cylinder</strong>

D. Velocity profile varies hyperbolically and the shear stress remains constant over the crosssection

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

454. The resistance wire used in a hot wire anemometer for conducting electrical current is made of__________________?
0

A. Chromium

B. Aluminium

C. Tungsten

D. Copper

455. A pressure head of 320 metres of water in meters of CCl4 (sp.gr = 1.6) will be__________________?
0

A. 100

B. 200

C. 320

D. 160

456. A fluid (?/?) = 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?
0

A. 700

B. 7

C. 630

D. 7000

457. In case of a Rotameter, the density of the float material is _____________ that of the liquid it replaces?
0

A. Equal to

B. More than

C. Less than

D. Either A. or B.

458. For ideally incompressible fluid, the Mach number will be __________________?
0

A. 1.5

B. 1

C. 5

D. 0

459. If in a flow field, between any two points, then the flow must be___________________?
0

A. Steady, compressible, irrotational

B. Unsteady, incompressible, irrotational

C. Steady, incompressible, irrotational

D. Steady, compressible and along a streamline

460. For pipes that must be broken at intervals for maintenance, the connector used should be a/an__________________?
0

A. Union

B. Tee

C. Reducer

D. Elbow

461. Fluidised beds are formed, when the__________________?
0

A. Sum of the fluid friction and pressure forces is equal and opposite to gravity forces

B. Gravity force is less than the fluid friction

C. Fluid friction is zero

D. Pressure forces equal gravity forces

462. In which type of fluid flow, the velocity of flow of fluid changes from point to point in the fluid at any instant ?
0

A. Turbulent

B. Non-uniform

C. Rotational

D. Unsteady

463. What is the value of co-efficient of discharge for square edged circular orifice (for ? = 0.3 to 0.5) ?
0

A. 0.35 0.55

B. 0.75 0.90

C. 0.5 0.75

D. 0.61 0.63

464. Mach number is important in a fluid flow problem, when the inertia and _____________ forces predominate?
0

A. Gravity

B. Elastic

C. Viscous

D. None of these

465. The discharge through a Venturimeter depends upon _________________?
0

A. Co-efficient of contraction only

B. Its orientation

C. None of these

D. Pressure drop only

466. Velocity at a certain point in case of streamline flow is_________________?
0

A. Constant

B. Independent of time

C. Both A. & B.

D. Neither A. nor B.

467. Which of the following quantities are computed by using the hydraulic radius for noncircular ducts ?
0

A. Head loss and velocity

B. Velocity and relative roughness

C. Reynold number, relative roughness and head loss

D. Reynolds number and friction factor

468. Momentum transfer in laminar flow of fluids results due to the_________________?
0

A. Density

B. Velocity gradient

C. Viscosity

D. None of these

469. Pascals law is valid, only when the fluid is_____________________?
0

A. None of these

B. At rest and when the frictionless fluid is in motion

C. Frictionless and at rest

D. At rest

470. The rate of shear versus the shear stress curves are time dependent for _____________ fluid?
0

A. Thixotropic

B. Rheopectic

C. Both A. & B.

D. Neither A. nor B.

471. For flow through a venturi at a particular discharge, the correct relationships among heads at points X, Y, and Z are__________________?
0

A. h2 < h1 < h3

B. h1 < h2 < h3

C. h1 > h2 < h3

D. h1 > h2 > h3

472. The ratio of inertial forces to gravity forces is called the ______________ number?
0

A. Euler

B. Froude

C. Weber

D. Mach

473. Slugging in a fluidised bed can be avoided by using_____________________?
0

A. Tall narrow vessel

B. Deep bed of solids

C. Very large particles

D. Shallow beds of solids and proper choice of particle size

474. Theoretical head developed by a centrifugal pump does not depend upon the _____________ the impeller?
0

A. Radius of

B. Fluid velocity leaving

C. Speed of

D. None of these

475. In an incompressible fluid, the density is____________________?
0

A. Greatly affected by moderate changes in pressure

B. Greatly affected only by moderate changes in temperature

C. Not affected with moderate change in temperature & pressure

D. Sensible to changes in both temperature & pressure

476. The discharge through a V-notch weir varies as___________________?
0

A. H3/2

B. H1/2

C. H5/2

D. H2/3

477. In case of Venturimeter, friction losses are about _____________ percent of maximum velocity head?
0

A. 12

B. 8

C. 20

D. 2

478. Eulers equation of motion states, that at every point, the_________________?
0

A. None of these

B. Fluid momentum is constant

C. Force per unit mass equals acceleration

D. Rate of mass outflow is equal to the rate of mass inflow

479. What is the ratio of fluid carrying capacity of two pipes having diameters d1 and d2 respectively ?
0

A. (d1/d2)0.8

B. d1/d2

C. (d1/d2)2

D. (d1/d2)0.5

480. The simple Pitot tube measures the _______________ pressure?
0

A. Total

B. static

C. None of these

D. Dynamic

481. 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?
0

A. Hyperbolic

B. Linear

C. Logarithmic

D. Parabolic

482. In the Newtons law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass is ______________ the fluid viscosity?
0

A. Inversely proportional to

B. Independent of

C. Inversely proportional to the square root of

D. Directly proportional to

483. The equation f-0.5 = 4.07 loge (NRe ?f)-0.6 is called the ____________?
0

A. None of these

B. Von-Karman equation

C. Colebrook formula

D. Fanning equation

484. In case of a ____________ the energy of flow is considerably decreased downstream of the machine?
0

A. Turbine

B. Blower

C. Centrifugal pump

D. Centrifugal fan

485. The Stokes stream function applies to the________________?
0

A. Irrotational flow only

B. None of these

C. Cases of axial symmetry

D. Ideal/non i viscous fluids only

486. Air vessel provided in a reciprocating pump__________________?
0

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

487. The Navier-Stokes equation deals with the law of conservation of___________________?
0

A. Mass

B. Energy

C. Both A. & B.

D. Momentum

488. Major loss in sudden contraction in pipe flow is due to ________________?
0

A. Expansion of flow after sudden contraction

B. None of these

C. Flow contraction

D. Boundary friction

489. What is the pipe called which lifts water from a reservoir to a greater height than the initial level in the supply reservoir ?
0

A. Pressure pipeline

B. Tunnel

C. Penstock

D. Siphon

490. Deformation drag, which is caused by widespread deformation of fluid around the immersed body____________________?
0

A. Depends mainly on cross-sectional shape

B. Occurs when NRe is very small

C. Is primarily a friction drag

D. Is independent of body length

491. Cd is always ______________ Cc?
0

A. Less than

B. Greater than

C. Equal to

D. Either more or less than

492. Cavitation in a pump creates so many undesirable effects. Out of the following, which is not an undesirable effect created by cavitation ?
0

A. Develops noise

B. Develops high pressure

C. Increase in thrust

D. Decrease in effect

493. What causes convective acceleration in fluid flow ?
0

A. Turbulence in flow

B. Non-uniformity of flow

C. Steep slope in flow

D. Unsteady nature of flow

494. A centrifugal pump loses prime after starting. The reason of this trouble may be_____________________?
0

A. Incomplete priming

B. All A., B., and C.

C. Low available NPSH and air leaks in the suction pipe

D. Too high a suction lift

495. 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________________?
0

A. Weir

B. Cup and vane anemometer

C. None of these

D. Hot wire anemometer

496. All pipes of a particular nominal size have the same_________________?
0

A. None of these

B. Inside diameter

C. Outside diameter

D. Thickness

497. Dimension of absolute viscosity is_________________?
0

A. MLT

B. ML-1T

C. ML-1T-1

D. MLT-1

498. Vena-contracta formed during flow of a liquid through an orificemeter has__________________?
0

A. Minimum velocity of fluid stream

B. Minimum liquid cross-section

C. None of these

D. More diameter compared to orifice diameter

499. In case of supersonic flow of a fluid through pipeline, the Mach number is__________________?
0

A. > 1

B. < 1

C. 1

D. 0

500. A pitched-blade turbine draws ______________ a straight blade turbine?
0

A. Data insufficient to predict

B. Less power than

C. More power than

D. Same power as

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