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. Different fluids
- B. Same fluid
- C. Same field of force
- D. Both B. and C.
Explanation: Equal-settling particles have the same terminal velocity under the same settling conditions, including the same fluid and field of force.
Correct answer: Both B. and C.- A. Ribbed
- B. Curved
- C. Plane
- D. Either A. or B.
Explanation: The working face of a filter-press plate is ribbed, providing drainage channels for the filtrate while the filter cake builds on the…
Correct answer: Ribbed- A. Banbury mixer
- B. Pug mill
- C. Muller-mixer
- D. None of these
Explanation: A vacuum pug mill mixes and kneads clay while removing entrained air under vacuum, producing a dense, uniform clay body.
Correct answer: Pug mill- A. Remains constant
- B. Decreases
- C. Increases
- D. Increases linearly
Explanation: A compressible cake compacts as pressure drop rises, reducing its void spaces and making fluid flow more difficult.
Correct answer: Increases- A. Sparger
- B. Kneader
- C. Masticator
- D. None of these
Explanation: A sparger introduces gas into a liquid through holes or a porous distributor, producing bubbles and gas-liquid contact.
Correct answer: Sparger- A. Crush intermittently
- B. Have greater capacity per unit of discharge area
- C. Are less suitable for coarse materials
- D. Have less steady power consumption
Explanation: A gyratory crusher acts continuously, whereas a jaw crusher has a reciprocating, intermittent action.
Correct answer: Have greater capacity per unit of discharge area- A. Blake jaw
- B. Gyratory
- C. Toothed roll
- D. None of these
Explanation: Toothed-roll crushers are suitable for relatively soft, tough or friable materials such as ice and gypsum.
Correct answer: Toothed roll828. ______________ are used for the separation of coarse particles from a slurry of fine particles?
- A. Thickeners
- B. Hydrocyclones
- C. Classifiers
- D. Decanters
Explanation: Classifiers separate particles according to settling behaviour, allowing coarse particles to be removed from a slurry containing finer…
Correct answer: Classifiers- A. 35
- B. 50
- C. 70
- D. 85
Explanation: A ball mill is commonly operated with a ball charge of about 40 to 50% of its internal volume. Thus 50% is the closest standard value.
Correct answer: 50- A. Density separation
- B. Differential wettability
- C. Size
- D. Volatile matter content
Explanation: A float-and-sink test divides coal according to its density, so its washability curve evaluates cleaning by density separation.
Correct answer: Density separation- A. ½ √(g/r)
- B. (1/π). √(g/r)
- C. (1/2π). √(g/r)
- D. 2π. √(g/r)
Explanation: At critical speed, a particle just remains in circular contact with the trammel wall, giving omega squared r equals g.
Correct answer: (1/2π). √(g/r)- A. 1
- B. 1.5
- C. 2
- D. 2.5
Explanation: Bond's law corresponds to an exponent n equal to 1.5 in the general crushing equation.
Correct answer: 1.5- A. Plate and frame filter
- B. Rotary vacuum filter
- C. Batch basket centrifuge
- D. None of these
Explanation: Activated carbon is a fine insoluble solid and is removed from glycerine by cake filtration.
Correct answer: Plate and frame filter- A. Bag filter
- B. Electrostatic precipitator
- C. Cyclone separator
- D. Wet scrubber
Explanation: Electrostatic precipitators efficiently collect very fine particles, including submicron dust, by electrically charging the particles and…
Correct answer: Electrostatic precipitator- A. Concentration of pyrites
- B. Concentration of iron ore
- C. Cleaning of coal
- D. Water treatment
Explanation: The Chance process is a gravity-based coal-washing method that separates clean coal from denser shale and pyrites.
Correct answer: Cleaning of coal- A. Constant pressure
- B. Varying pressure
- C. Varying rate
- D. Constant rate
Explanation: When slurry is filtered at a constant rate, the cake resistance increases and the inlet pressure must continuously rise.
Correct answer: Constant rate- A. Both A. & B.
- B. Froude
- C. Reynold's
- D. Neither A. nor B.
Explanation: Mixing power depends on both the Reynolds number, which indicates viscous or turbulent flow, and the Froude number, which represents the…
Correct answer: Both A. & B.838. Which of the following size reduction equipments employs mainly attrition for ultrafine grinding ?
- A. Jet mills
- B. Fluid energy mill
- C. All A., B. and C.
- D. Micronizer
Explanation: Jet mills, fluid-energy mills and micronizers are essentially related types of equipment for ultrafine grinding.
Correct answer: All A., B. and C.- A. Blending miscible liquids
- B. Continuous mixing
- C. Bath mixing
- D. Non-flowing powder and thin pastes
Explanation: Ribbon blenders are horizontal mixers designed mainly for dry, non-flowing powders and can also handle thin pastes.
Correct answer: Non-flowing powder and thin pastes- A. Nc = (1/4π). √(g/R1 - R2)
- B. Nc = (1/2π). √(g/R1 - R2)
- C. Nc = (1/π). √(g/R1 - R2)
- D. Nc = (1/2π). √(R1 - R2/g)
Explanation: At critical speed, a ball just remains in contact with the mill wall at the top, giving Nc = (1/2π)√[g/(R1 − R2)].
Correct answer: Nc = (1/2π). √(g/R1 - R2)