chemical engineering MCQs – Page 332

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 Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs

6621. Momentum transfer in laminar flow of fluids results due to the_________________?
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A. Velocity gradient

B. None of these

C. Density

D. Viscosity

6622. 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

6623. 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. Rotational

B. Non-uniform

C. Turbulent

D. Unsteady

6624. The pressure head of a flow meter remains constant for_________________?
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A. Pitot tube

B. Orificemeter

C. Venturimeter

D. Rotameter

6625. The ratio of average fluid velocity to the maximum velocity in case of laminar flow of a Newtonian fluid in a circular pipe is_____________________?
0

A. 1

B. 0.5

C. 0.66

D. 2

6626. The co-efficient of drag and lift for an incompressible fluid depends on the_________________?
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A. Reynolds number

B. Mach number

C. All A., B. and C.

D. Froude number

6627. A double acting reciprocating pump compared to a single acting pump (of almost same size working under same pressure levels) would give almost double___________________?
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A. Efficiency

B. None of these

C. Head

D. Discharge

6628. Which of the following two quantities when same, makes one pipe system equivalent to another pipe system ?
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A. Length & diameter

B. Head & discharge

C. Length & discharge

D. Friction factor & diameter

6629. The phenomenon occuring during pumping of a liquid solution containing dissolved gases, which may come out of the solution giving rise to gas pockets, is termed as_______________?
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A. Sublimation

B. Cavitation

C. Evaporation

D. Stripping

6630. Boundary layer separation is caused by the_________________?
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A. Reduction of pressure gradient to zero

B. Boundary layer thickness reducing to zero

C. Adverse pressure gradient

D. Reduction of pressure to vapour pressure

6631. Centre of pressure of a plane surface of arbitrary shape immersed vertically in a static mass of fluid________________?
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A. Is different for different fluids

B. Lies above the centroid of the plane surface

C. Is independent of the specific weight of the fluid

D. Is at the centroid of the plane surface

6632. The discharge through a Venturimeter depends upon _________________?
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A. Co-efficient of contraction only

B. Pressure drop only

C. Its orientation

D. None of these

6633. Fluidised beds are formed, when the__________________?
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A. Fluid friction is zero

B. Pressure forces equal gravity forces

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

D. Gravity force is less than the fluid friction

6634. Consider a centrifugal pump having a specific impeller diameter, fixed impeller speed pumping a liquid of constant density at a particular discharge capacity. With decrease in the capacity of the pump, the _______________ decreases?
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A. Head of the liquid pumped

B. NPSH required

C. All A., B. and C.

D. BHP required by the pump

6635. The flow of gas along a pipe in the direction of decreasing pressure causes decrease in its__________________?
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A. Viscosity

B. Velocity

C. None of these

D. Specific volume

6636. 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. 0.5 0.75

B. 0.61 0.63

C. 0.35 0.55

D. 0.75 0.90

6637. Pick out the Hagen-Poiseuille?s equation ?
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A. ?p/? = 4f (L/D) (V2/2gc)

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

C. cDp)

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

E. 2cD)

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

6638. 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

6639. Co-efficient of velocity is ___________________ the coefficient of discharge?
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A. More than

B. Less than

C. Equal to

D. Not related to

6640. The inherent characteristic of an equal percentage valve relating flow rate q with valve stem movement x are described by the equation_________________?
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A. dq/dx = K

B. dq/dx = K.q

C. dq/dx = Kq2

D. dq/dx = K/q

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