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Chemical Engineering MCQs: 8,342 practice questions with answer choices and available explanations. Page 280 of 557.

Chemical Engineering MCQs

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Pick out the correct combination about the role of various additives used in polymers?

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A.Heat stabiliser: increases the maximum service temperature
B.Lubricants: increases the flexibility of polymers
C.Fillers: Does not affect the property of polymer but increases its weight
D.Plasticiser: increases the polymer strength
Explanation: The correct answer is Fillers: Does not affect the property of polymer but increases its weight.

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A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun’s equation for the above fluid-particle system (in SI units) is given below : Δ P/L = 375 × 103 VOM + 10.94 × 106 V2 OM (SI units) If water is to be used as the fluidising medium, the minimum fluidisation velocity, VOM is________?

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A.28 mm/s
B.24 mm/s
C.12 mm/s
D.16 mm/s
Explanation: The correct answer is 16 mm/s.

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