Chemical Engineering MCQs

Page No. 595

Colloid mills achieve size reduction mainly by___________________?


aImpact


bAttrition


cCutting


dCompression


View Answer Attrition

Cake resistance is___________________?


aImportant in the beginning of filtration


bDecreased with the time of filtration


cIndependent of pressure drop


dNone of these


View Answer None of these

A _____________ mill is a revolving mill divided into two or more sections by perforated partitions in which preliminary grinding takes place at one end and the finishing grinding at the discharge end?


aCompartment


bTube


cRod


dPebble


View Answer Compartment

For spheres, the specific surface shape factor is given by___________________?


aAD/V


bD/V


cA/V


d√(AD/V)


View Answer AD/V

Size reduction of the ______________ can be suitably done by ball mills, crushing rolls and rod mills?


aMetalliferous ores


bNon-metallic ores


cBasic slags


dAsbestos & mica


View Answer Metalliferous ores

Handling of ashes and similar materials can be done best by a ______________ conveyor?


aFlight


bDrag or slat


cBelt


dRibbon


View Answer Drag or slat

Which of the following crushers can be considered as a combination of a jaw crusher and a roller crusher ?


aRod mill


bFluid energy mill


cGyratory crusher


dBall mill


View Answer Gyratory crusher

A 30% (by volume) suspension of spherical sand particles in a viscous oil has a hindered settling velocity of 4.44 μm/s. If the Richardson Zaki hindered settling index is 4.5, then the terminal velocity of a sand grain is_________________?


a0.90 μm/s


b1 μm/s


c22.1 μm/s


d0.02 μm/s


View Answer 1 μm/s

If dp is the equivalent diameter of a non-spherical particle, Vp its volume and sp its surface area, then its sphericity is φs is defined by________________?


aφs = 6 Vp/dpsp


bφs = Vp/dpsp


cφs = 6 dpSp/Vp


dφs = dpSp/Vp


View Answer φs = 6 Vp/dpsp

Compressibility co-efficient for an absolutely compressible cake is_______________?


a0


b1


c0 to 1


d


View Answer 1

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