Free Fluid Flow Operations MCQs with Answers
909 Fluid Flow Operations MCQs from Chemical Engineering, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
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- A. Decreases with increase in gas flow rate
- B. Is inversely proportional to the mass of the dust particle
- C. None of these
- D. Is directly proportional to the radius of the dust particle path
Explanation: Cyclone collection efficiency generally increases with gas velocity and particle size or mass, rather than decreasing or varying inversely…
Correct answer: None of these- A. 5
- B. 60
- C. 160
- D. 200
Explanation: A tee used to turn the flow from the run into the branch has a relatively large fitting resistance, commonly represented by an equivalent…
Correct answer: 60- A. Di, opt = 3.9 Q0.45. μ0.95
- B. Di, opt = 3.9 Q0.45 ρ0.13
- C. Di, opt = 4.7 Q0.36. μ3.2ρ0.13
- D. Di, opt = 3 Q0.36. μ0.88
Explanation: For turbulent flow of a relatively low-viscosity fluid in commercial steel pipe, the usual economic-diameter correlation depends mainly on…
Correct answer: Di, opt = 3.9 Q0.45 ρ0.13- A. Height & properties of the liquid
- B. Agitator type & speed of agitation
- C. Size of agitator & the tank
- D. All A., B. and C.
Explanation: Agitation power depends on liquid properties and level, tank and impeller dimensions, impeller type, and rotational speed.
Correct answer: All A., B. and C.- A. Centrifugal
- B. Gear
- C. Screw
- D. Reciprocating
Explanation: Centrifugal pumps are widely used for transporting crude oil because they provide continuous flow at the high capacities required in…
Correct answer: Centrifugal- A. 1
- B. 4.08
- C. 0.408
- D. 40.8
Explanation: Using the standard approximate conversion, 1 centistoke is about 4.08 Redwood I seconds.
Correct answer: 4.08- A. 1
- B. ∞
- C. 0
- D. Between 0 and 1
Explanation: Ideal plug flow has no radial or axial back-mixing, so the turbulent or eddy diffusivity in the flow direction is taken as zero.
Correct answer: 0- A. Plug flow
- B. Mixed flow
- C. Dispersion
- D. Tank in series
Explanation: A real packed bed has axial spreading caused by nonuniform voids and molecular or turbulent mixing, so the axial-dispersion model is more…
Correct answer: Dispersion- A. Both A. & B.
- B. Vortexing
- C. Swirling
- D. Neither A. nor B.
Explanation: Baffles interrupt tangential fluid motion in an agitator, thereby reducing both swirling and the formation of a central vortex.
Correct answer: Both A. & B.- A. Polyester fibres
- B. Metallic wire woven mesh
- C. Cotton fibres
- D. Nylon fibres
Explanation: Bag-filter bags are normally made from textile or synthetic fibres such as cotton, polyester, or nylon.
Correct answer: Metallic wire woven mesh- A. Remains constant
- B. Decreases gradually
- C. Increases continuously
- D. None of these
Explanation: At a constant filtration rate, the cake becomes thicker and offers increasing resistance to flow, so the pressure difference and inlet…
Correct answer: Increases continuously- A. Electrical & magnetic properties
- B. Density
- C. Wettability
- D. Size
Explanation: A trommel is a rotating perforated or screen cylinder, so particles are separated according to whether their size allows them to pass…
Correct answer: Size- A. Classifier
- B. Both A. & B.
- C. Cyclone separator between mill & classifier
- D. Neither A. nor B.
Explanation: Air-swept closed-circuit ball milling uses a classifier to return coarse particles to the mill, while a cyclone separates the fine product…
Correct answer: Both A. & B.- A. Ribbon conveyor
- B. Flight conveyor
- C. Bucket elevators
- D. Drag conveyor
Explanation: Scraper conveyors include flight, drag, and ribbon types, which move material along a trough or surface.
Correct answer: Bucket elevators- A. Calcite
- B. Feldspar
- C. Corundum
- D. Talc
Explanation: On the Mohs hardness scale, talc has hardness 1, making it the softest of these minerals.
Correct answer: Talc- A. Remain constant
- B. Decreases
- C. Increases
- D. None of these
Explanation: During cake washing, the cake structure and filter-medium resistance are normally unchanged, so the total hydraulic resistance remains…
Correct answer: Remain constant- A. Bag filter
- B. Air filter
- C. Venturi scrubber
- D. Hydrocyclones
Explanation: Air filters can use metallic wire mesh as a filtering medium for removing dust from a gas stream.
Correct answer: Air filter678. The work index in Bond's law for crushing of solids has the following dimensions__________________?
- A. No units (dimensionless)
- B. kW/ton
- C. kWh/ton
- D. kWh.m1/2/ton
Explanation: In Bond's equation, the work index multiplies terms expressed in inverse square-root particle size, leaving energy per unit mass as the…
Correct answer: kWh/ton- A. Galena
- B. Rutile
- C. Chromite
- D. Siderite
Explanation: Galena is generally nonmagnetic and is therefore not normally concentrated by magnetic separation.
Correct answer: Galena- A. Iron ores
- B. Gold ores
- C. Talc
- D. Diamond
Explanation: Stamp mills use heavy pestles that repeatedly crush ore and were historically important in extracting gold from auriferous ores.
Correct answer: Gold ores