Free Chemical Process Principles MCQs with Answers
2,710 Chemical Process Principles 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. Crushing
- B. Coarse grinding
- C. Fine grinding
- D. Attrition
Explanation: A ball mill is mainly a fine-grinding device in which tumbling balls apply impact and attrition to the particles.
Correct answer: Fine grinding- A. At time zero
- B. At the end of filtration, but decreases with time subsequently
- C. When half the filtrate has been obtained
- D. At the end of filtration
Explanation: At the start of washing, the cake has the maximum thickness reached during filtration, so its resistance and the washing rate correspond…
Correct answer: At the end of filtration- A. 0.0047 cm
- B. 0.0074 mm
- C. 0.0074 cm
- D. 74 milli-microns
Explanation: A 200-mesh Taylor screen has an opening of about 74 micrometres, which is 0.0074 cm.
Correct answer: 0.0074 cm- A. Plate and frame filter
- B. Cartridge filter
- C. Shell and leaf filter
- D. None of these
Explanation: Plate-and-frame, cartridge, and shell-and-leaf filters are generally operated as batch or intermittent filters rather than true continuous…
Correct answer: None of these- A. Froth floatation
- B. Tabling
- C. Jigging
- D. Classification
Explanation: Froth flotation selectively attaches hydrophobic sulphide mineral particles to air bubbles, allowing them to be separated from gangue.
Correct answer: Froth floatation- A. Drag
- B. Ribbon
- C. Screw
- D. Slat
Explanation: A ribbon conveyor has a ribbon-shaped screw flight that handles cohesive, sticky and gummy materials with less tendency to compact or…
Correct answer: Ribbon- A. 1
- B. ∞
- C. > 1
- D. < 1
Explanation: Sphericity is the ratio comparing a particle with an equal-volume sphere, and it is 1 only for a perfect sphere.
Correct answer: < 1- A. Df/Dp
- B. Dp/Df
- C. Df - Dp
- D. None of these
Explanation: Reduction ratio measures how many times the average particle size is reduced, so it is the feed diameter divided by the product diameter…
Correct answer: Df/Dp- A. Attrition
- B. Impact
- C. Compression
- D. Cutting
Explanation: In a ball mill, the balls are lifted and then fall onto the particles, producing impact that causes much of the size reduction.
Correct answer: Impact- A. Blake jaw crusher
- B. Gyratory crusher
- C. Toothed roll crusher
- D. Dodge jaw crusher
Explanation: Among the listed machines, the toothed roll crusher is used for relatively fine crushing, while Blake, gyratory and Dodge jaw crushers are…
Correct answer: Toothed roll crusher- A. Tumbler
- B. Ribbon blender
- C. Muller
- D. Banbury
Explanation: A Banbury mixer is a heavy-duty internal mixer used for intensive mixing and mastication of rubber, including treatment of rubber scrap.
Correct answer: Banbury1852. For spheres, the surface shape factor is given by (where, A = area, V = volume, and D = diameter) ?
- A. π = (A/D2)
- B. π/6 = (V/D3)
- C. AD/V
- D. None of these
Explanation: For a sphere, surface area A = πD², so the surface shape factor A/D² equals π.
Correct answer: π = (A/D2)- A. Primary
- B. Fine
- C. Intermediate
- D. Ultrafine
Explanation: A gravity stamp mill uses falling stamps to deliver repeated impact blows and is commonly used for fine crushing or pulverising of ore.
Correct answer: Fine- A. Light metal powder down upto 4 mesh size
- B. Dry chemicals
- C. Heavy tonnages of rocks or gravel
- D. Powdered food & granular materials
Explanation: Reciprocating screens are useful for light powders and granular materials but are not designed for the high-throughput handling of heavy…
Correct answer: Heavy tonnages of rocks or gravel- A. Cutting
- B. Grinding
- C. Crushing
- D. Ultra-grinding
Explanation: A fluid energy mill uses high-velocity jets of gas to produce intense particle-to-particle impact, making it suitable for ultra-fine…
Correct answer: Ultra-grinding- A. 3.6 V.W.Dr.ρ
- B. 3.6 V.W. ρ
- C. 3.6 W.Dr.ρ
- D. 3.6 V.W.Dr/ρ
Explanation: The roll gap gives the approximate bed thickness, so the volumetric throughput is V × W × Dr; multiplying by density gives mass flow.
Correct answer: 3.6 V.W.Dr.ρ- A. Froth floatation
- B. Classification
- C. Thickening
- D. Clarification
Explanation: Classification separates suspended particles according to their settling behaviour, which depends mainly on size, shape, and density.
Correct answer: Classification- A. Piping
- B. None of these
- C. Filter medium
- D. Cake
Explanation: In a rotary drum vacuum filter, the deposited cake usually provides the dominant resistance to filtrate flow as it builds up.
Correct answer: Cake- A. Ball mill
- B. Roller crusher
- C. Jaw crusher
- D. Gyratory crusher
Explanation: A ball mill applies repeated impact and attrition, allowing granular talc to be reduced to a fine powder.
Correct answer: Ball mill- A. LS
- B. 93 LS
- C. 250 LS
- D. √(LS)
Explanation: Taggart’s empirical relation for the stated jaw and gyratory crusher range uses the product of feed-opening length and discharge width…
Correct answer: 93 LS