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

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bHelical screw

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cFlat blade turbine

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dCurved blade turbine

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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

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b1/√μ

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c1/μ

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d1/μ2

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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

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bHagen-Poiseuille’s

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cFanning’s

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dKremser

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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

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bRod mill

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cPebble mill

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dTube mill

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View Answer Tube mill

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


aDiameter of the rolls

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bSpeed of the rolls

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cProduct size

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dFeed size

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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

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bD

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c1.5 D

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d2 D

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View Answer D

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


a< 5

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b10 to 25

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c< 74

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d> 1000

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View Answer < 74

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


aBelt conveyor

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bBucket elevator

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cScrew conveyor

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dApron conveyor

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View Answer Screw conveyor

Which of the following is not used as filter aid ?


aAsbestos

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bDiatomaceous earth

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cPurified wood cellulose

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dRice husk

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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

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bBubble point

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cDry bulb temperature

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dWet bulb temperature

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View Answer Dew point

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