Chemical Engineering MCQs

Page No. 604

Run of mine (ROM) coal is crushed by a _________________________ for use in domestic ovens?


aJaw crusher

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bHammer crusher

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cBall mill

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dTube mill

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View Answer Hammer crusher

Sizing of very fine particles of the order of 5 to 10 microns is done by elutriation, which is a _____________ operation?


aClarification

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bSedimentation

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cFlocculation

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dClassification

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View Answer Classification

Ultra centrifuges are used for the separation of _____________ solid particles?


aCoarse

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bFine

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cColloidal

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dDissolved

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View Answer Colloidal

Separation of materials into products based on the difference of their sizes is called___________________?


aSizing

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bSorting

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cClassification

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dFlocculation

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View Answer Sizing

The sphericity of a cylinder of 1 mm diameter and length 3 mm is_________________?


a0.9

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b0.78

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c0.6

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d0.5

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View Answer 0.9

Which of the following is not a cutting machine ?


aDicers

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bKnife cutters

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cSlitters

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dTube mills

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View Answer Tube mills

The ratio of the area of openings in one screen (Taylor series) to that of the openings in the next smaller screen is_________________?


a1.5

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b1

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c√2

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dNone of these

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View Answer None of these

Apron conveyors are used for ___________________ ?


aHeavy loads & short runs

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bSmall loads & long runs

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cHeavy loads & long runs

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dNone of these

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Which of the following is the most suitable for cleaning of fine coal dust (<0.5 mm) ?


aTrough washer

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bBaum jig washer

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cSpiral separator

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dFroth floatation

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View Answer Froth floatation

Velocity of a small particle of diameter ‘Dp’ at a distance ‘r’ from the rotational axis of a cyclone rotating at an angular speed ‘ω’ is given by (the other symbols are as per standard notation) ?


a[(DP/18). (ρs – ρ/μ)] ω2r

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b[(DP2/18). (ρs – ρ/μ)] ω2r

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c[(DP/18). (ρs – ρ/μ)] ω2r2

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d[(DP2/18). (ρs – ρ/μ)] ω2r

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