chemical engineering fluid mechanics for chemical chemical engineering MCQs – Page 24

Practise multiple-choice questions from chemical engineering fluid mechanics for chemical chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering fluid mechanics for chemical chemical engineering Mcqs
461. Fluidised beds are formed, when the__________________?
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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 ?
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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) ?
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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?
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A. Gravity

B. Elastic

C. Viscous

D. None of these

465. The discharge through a Venturimeter depends upon _________________?
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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_________________?
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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 ?
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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_________________?
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A. Density

B. Velocity gradient

C. Viscosity

D. None of these

469. Pascals law is valid, only when the fluid is_____________________?
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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?
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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__________________?
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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?
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A. Euler

B. Froude

C. Weber

D. Mach

473. Slugging in a fluidised bed can be avoided by using_____________________?
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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?
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A. Radius of

B. Fluid velocity leaving

C. Speed of

D. None of these
475. In an incompressible fluid, the density is____________________?
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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___________________?
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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?
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A. 12

B. 8

C. 20

D. 2
478. Eulers equation of motion states, that at every point, the_________________?
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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 ?
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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?
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A. Total

B. static

C. None of these

D. Dynamic