Chemical Engineering MCQs

Page No. 833

Pick out the correct combination about the role of various additives used in polymers ?


aPlasticiser: increases the polymer strength


bHeat stabiliser: increases the maximum service temperature


cFillers: Does not affect the property of polymer but increases its weight


dLubricants: increases the flexibility of polymers



In multipass welds, shot peening is done after each pass to__________________?


aClose the surface porosity


bBreak the continuity of columnar grains


cFlatten the weldment


dIntroduce texture in the weld



Shampoos are commercially not available in the form of ___________________?


aPowder


bGaseous mixture


cSolution


dEmulsion


View Answer Gaseous mixture

Which of the following is an ore dressing operation ?


aClassification


bSmelting


cRoasting


dNone of these


View Answer Classification

Material of construction of the electrode used in the electric resistance welding is___________________?


aStainless steel


bGraphite


cCopper


dSteel


View Answer Copper

Normalising does not ______________________ of a metal ?


aImprove machinability & tensile strength


bRemove internal stresses


cRefine the structure


dRemove strains caused by cold working



Even though heat transfer co-efficient in boiling liquids is large, use of fins is advantageous, when the entire surface is exposed to ________________ boiling ?


aFilm


bNucleate


cTransition


dAll modes of


View Answer Film

The wet bulb temperature is lower in dry air than in wet air at the same temperature. A dry bulb thermometer registers a higher temperature than a wet bulb thermometer except at ______________ percent relative humidity ?


a0


b100


c50


dNone of these


View Answer 100

A polymer is termed as an ‘elastomer’, if its percentage elongation is more than 100%. An elastomer is termed as ‘rubber’ if its percentage elongation is more than _______________ percent ?


a150


b200


c300


d400


View Answer 200

The units of the rate constant for a second order reaction are__________________?


aSec-1. mole°


bMoles1. sec-1


cMoles-1. sec1


dMoles1. sec1


View Answer Moles-1. sec1

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