Chemical Engineering MCQs

Page No. 769

Electrolytic reduction cell used for conversion of calcined Al2O3 to Al is a carbon lined furnace operating at 800-900 °C. The purpose of electric current supplied to the furnace is to___________________?


aAchieve very high purity of aluminium (99.9%)


bKeep the electrolyte in liquid condition by the generation of heat


cElectrolytically dissociate alumina


dBoth B. & C.


View Answer Both B. & C.

Holes for riveting purposes should be preferably made by________________?


aCutting torch


bDrilling


cPunching


dNone of these


View Answer Drilling

Reynolds number of a fluid flowing in a circular pipe is 10,000. What will be the Reynolds number when the fluid velocity is decreased by 30% & the pipe diameter is increased by 30% ?


a9,100


b13,000


c7,000


d2,550


View Answer 9,100

Triple point of water is__________________?


a0.01 °C


b492°R


c0°K


d-273°C


View Answer 0.01 °C

Ganister contains maximum percentage of_________________?


aFeO


bSiO2


cMgO


dMnO2


View Answer SiO2

Energy to be supplied to the radioactive nucleus for the emission of a neutron is ________________ MeV?


a0.8


b7.8


c200


d10000


View Answer 0.8

Euler number is defined as the ratio of inertia force to _______________ force?


aPressure


bElastic


cGravity


dViscous


View Answer Pressure

The co-ordination number in simple cubic structure is___________________?


a4


b6


c8


d12


View Answer 6

In inventory control theory, the economic order quantity (EOQ) is the____________________?


aLot size corresponding to break even analysis


bAverage level of inventory


cOptimum lot size


dNone of these


View Answer Optimum lot size

In a boundary layer developed along the flow, the pressure decreases in the downstream direction. The boundary layer thickness in this case will _______________?


aDecrease gradually


bIncrease gradually


cIncrease rapidly


dRemain constant


View Answer Increase gradually

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