Chemical Engineering MCQs

Page No. 604

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


aJaw crusher


bHammer crusher


cBall mill


dTube mill


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


bSedimentation


cFlocculation


dClassification


View Answer Classification

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


aCoarse


bFine


cColloidal


dDissolved


View Answer Colloidal

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


aSizing


bSorting


cClassification


dFlocculation


View Answer Sizing

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


a0.9


b0.78


c0.6


d0.5


View Answer 0.9

Which of the following is not a cutting machine ?


aDicers


bKnife cutters


cSlitters


dTube mills


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


b1


c√2


dNone of these


View Answer None of these

Apron conveyors are used for ___________________ ?


aHeavy loads & short runs


bSmall loads & long runs


cHeavy loads & long runs


dNone of these



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


aTrough washer


bBaum jig washer


cSpiral separator


dFroth floatation


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


b[(DP2/18). (ρs – ρ/μ)] ω2r


c[(DP/18). (ρs – ρ/μ)] ω2r2


d[(DP2/18). (ρs – ρ/μ)] ω2r



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