Chemical Engineering MCQs

Page No. 419

Hot metal runner in blast furnace are lined with ______________ bricks?


aSilica


bCarborundum


cFireclay


dMagnesite


View Answer Fireclay

Pick out the wrong statement?


aIn practical operation, distillation towers having diameter 3-6 metres equipped with bubble cap (round) size of 15 cms are used


bHeight of packing in a packed tower is about 3 times the column diameter for raschig rings and about 5 to 10 times the column diameter for saddle packing


cIn a sieve tray, the minimum hole diameter is equal to the tray thickness


dIn a stainless steel sieve tray, the minimum hole diameter is equal to 10 times the plate thickness



Pick out the wrong statement?


aAtomic heat capacities of the crystalline solid elements are nearly constant and equal to 6.2 kcal/kg-atom according to the law of Petit and Dulong


bAtomic heat capacities of all solid elements decrease greatly with decrease in temperature, approaching a value of zero at absolute zero temperature, when in the crystalline state


cGenerally, the heat capacities of compounds are lower in the liquid than in the solid state


dThe heat capacity of a heterogeneous mixture is an additive property, but when solutions are formed, this additive property may no longer exist



Pick out the correct conversion?


a1 BTU =453.6 calories


b1 BTU = 252 calories


c1 calorie = 252 BTU


d1 calorie = 453.6 BTU


View Answer 1 BTU = 252 calories

Pick out the wrong statement?


aInsulating refractories used in place of regular refractory bricks are usually called light weight refractories, and they have similar composition as heavy bricks


bGraphite refractories are also called plumbago refractories


cSuperduty fireclay bricks correspond to a pyrometric cone equivalent of 26-28


dCalcined magnesite is also called dead burnt magnesite



Pick out the wrong statement?


aRefractories used in muffle furnace should have low thermal conductivity


bThe electrical resistivity of refractories drops rapidly with rise in temperature


cFor reducing spalling tendency, the refractory should be well fired and its porosity should be more


dRefractoriness under load (RUL) of a refractory is always less than its refractoriness



Pick out the wrong statement ?


aPlate efficiency increases with increase in superficial vapour velocity till entrainment limit


bIncrease in depth of the liquid about the slots increases the plate efficiency, particularly if the liquid depth is < 1"


cToo small a plate spacing can cause a low efficiency, if the vapour velocity is greater than the allowable value


dNone of these


View Answer None of these

Pick out the wrong statement?


aRiveting provides a permanent fastening method


bThe joint made by overlapping of one plate over the other, and then riveting the two plates together with two rows of rivets is called ‘double riveted butt joint’


cShank diameter of the rivets should be less than the size of the hole drilled in the plate for riveting


dThe efficiency of a riveted joint is the ratio of the strength of the riveted joint to the strength of the solid plate



Pick out the wrong statement?


aThe tensile strength of a brittle material is less than its compressive strength


bThe compressive strength of a ductile material is less than its tensile strength


cIn a thick cylindrical shell, the hoop stress is maximum at the inner radius


dThe value of crushing load is more than that of buckling load for long columns



The number of H+ in 1 c.c solution of pH 13 is__________________?


a6.023 × 1013


b6.023 × 1010


c6.023 × 107


d1013


View Answer 6.023 × 107

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