Chemical Engineering MCQs

Page No. 419

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


aSilica

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bCarborundum

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cFireclay

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dMagnesite

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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

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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

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

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

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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

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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

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

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

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Pick out the correct conversion?


a1 BTU =453.6 calories

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b1 BTU = 252 calories

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c1 calorie = 252 BTU

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d1 calorie = 453.6 BTU

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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

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bGraphite refractories are also called plumbago refractories

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

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dCalcined magnesite is also called dead burnt magnesite

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Pick out the wrong statement?


aRefractories used in muffle furnace should have low thermal conductivity

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bThe electrical resistivity of refractories drops rapidly with rise in temperature

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

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

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Pick out the wrong statement ?


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

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

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

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dNone of these

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View Answer None of these

Pick out the wrong statement?


aRiveting provides a permanent fastening method

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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’

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

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

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Pick out the wrong statement?


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

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

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

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

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


a6.023 × 1013

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b6.023 × 1010

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c6.023 × 107

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d1013

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View Answer 6.023 × 107

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