Chemical Engineering MCQs

Page No. 627

Which of the following agitators having a large blade area, rotating at slow speed is used for mixing high viscosity liquids (> 50000 centipoise) ?


aPropeller


bHelical screw


cFlat blade turbine


dCurved blade turbine


View Answer Helical screw

Filtrate flow rate in case of a rotary drum vacuum filter (in which Rm < < Rc) is proportional to ____________ and the cycle time (where, μ = filtrate viscosity Rm = filter medium resistance Rc = cake resistance)?


a√μ


b1/√μ


c1/μ


d1/μ2


View Answer 1/√μ

Flow of filtrate through the cake in a plate and frame filter press is best described by the ______________ equation?


aKozeny-Carman


bHagen-Poiseuille’s


cFanning’s


dKremser


View Answer Kozeny-Carman

Which of the following grinding mills has the horizontally arranged rods as the grinding elements thereby delivering more uniform granular products with minimum fines ?


aCompartment mill


bRod mill


cPebble mill


dTube mill


View Answer Tube mill

Angle of nip of the crushing rolls does not depend upon the_______________?


aDiameter of the rolls


bSpeed of the rolls


cProduct size


dFeed size


View Answer Speed of the rolls

Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter) ?


a0.5 D


bD


c1.5 D


d2 D


View Answer D

Particle size range in which dust catcher (gravity settling chamber) works most effectively and efficiently is ______________ microns?


a< 5


b10 to 25


c< 74


d> 1000


View Answer < 74

Which of the following mechanical conveyors does not come under the division „carriers‟ ?


aBelt conveyor


bBucket elevator


cScrew conveyor


dApron conveyor


View Answer Screw conveyor

Which of the following is not used as filter aid ?


aAsbestos


bDiatomaceous earth


cPurified wood cellulose


dRice husk


View Answer Rice husk

_____________ is the temperature at which a gas-vapor mixture becomes saturated, when cooled at constant total pressure out of contact with a liquid ?


aDew point


bBubble point


cDry bulb temperature


dWet bulb temperature


View Answer Dew point

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