chemical engineering MCQs – Page 328

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 Review each marked answer and report any item that may be outdated or unclear.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

6541. Reciprocating pumps compared to centrifugal pumps__________________?
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A. Are not subject to air binding

B. Deliver liquid at uniform pressure

C. Can be operated with delivery valve closed

D. Can handle slurries more efficiently

6542. Cd is always ______________ Cc?
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A. Either more or less than

B. Equal to

C. Greater than

D. Less than

6543. Buoyant force__________________?
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A. Depends on the depth of the submergence of the floating body

B. For non-symmetrical bodies is not vertical

C. None of these

D. Depends on the weight of the floating body

6544. Cavitation in a centrifugal pump can be avoided by keeping the__________________?
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A. Outlet pressure low

B. Outlet pressure high

C. Inlet pressure low

D. Inlet pressure high

6545. When the pipe Reynolds number is 6000, the flow is generally___________________?
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A. Laminar

B. Transition

C. Turbulent

D. Viscous

6546. A mono pump is a __________ pump ?
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A. Piston

B. Positive acting rotary

C. Centrifugal

D. A group of vacuum

6547. For motion of spherical particles in a stationary fluid, the drag co-efficient in hindered settling compared to that in free settling is _______________?
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A. More

B. Less

C. More or less, depending on the type of particle

D. Equal

6548. Schedule number of a pipe, which is a measure of its wall thickness, is given by ________________?
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A. 10000 P/S

B. 100 P/S

C. 1000 S/P

D. 1000 P/S

6549. A pitched-blade turbine draws ______________ a straight blade turbine?
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A. Data insufficient to predict

B. Same power as

C. Less power than

D. More power than

6550. A special type of liquid transporting device is the diffuser pump, in which _____________ are minimised?
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A. Cavitation

B. Bearing losses

C. Disk friction

D. Shock losses

6551. Which of the following is a dimensionless parameter ?
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A. Kinematic viscosity

B. None of these

C. Specific weight

D. Angular velocity

6552. Which of the following is the Blasius equation?, relating friction factor to the Reynolds number ?
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A. f = 0.079.NRe-0.25

B. f-0.5 = 4.07 loge (NRef)-0.6

C. Both a and b

D. None of these

6553. The equivalent diameter for pressure drop calculation for a duct of square cross-section is given by (where, x = each side of the square duct) ?
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A. x

B. ?(2x)

C. ?(?x)

D. ?(x/2)

6554. Mercury is an ideal barometric fluid mainly due to its __________________?
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A. High density

B. Low compressibility

C. Low capillary action

D. Very low vapor pressure

6555. For a specific centrifugal air blower operating at constant speed & capacity, the power requirement and pressure vary_______________?
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A. Inversely as gas density

B. Directly as square of gas density

C. Directly as gas density

D. Directly as square root of gas density

6556. The most suitable flow measuring device for the fluid flow measurement in a very large diameter pipeline is a____________________?
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A. Weir

B. V-notch

C. Kennison nozzle

D. Pitot tube

6557. 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.

6558. In case of a Rotameter, the density of the float material is _____________ that of the liquid it replaces?
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A. Less than

B. Either A. or B.

C. More than

D. Equal to

6559. All pipes of a particular nominal size have the same_________________?
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A. Outside diameter

B. Thickness

C. None of these

D. Inside diameter

6560. The continuity equation__________________?
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A. None of these

B. Relates work and energy

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

D. Relates mass flow rate along a stream tube

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