Chemical Engineering MCQs

Page No. 13

Heat transfer rate to the charge/stock in a furnace does not depend upon the________________?


aType of fuels viz. solid, liquid or gaseous


bFlue gas temperature


cEmissivity of refractory walls


dInitial temperature of the charged stock



Higher furnace temperature cannot be achieved by use of a lean fuel gas in the furnace by_________________?


aIncreasing the draft in the furnace


bPreheating the fuel gas


cOxygen enrichment of combustion air


dPreheating the combustion air



Pick out the wrong statement?


aGreater is the kinematic viscosity of the liquid, greater is the thickness of the boundary layer


bBlowers develop a maximum pressure of 2 atmospheres


cFriction losses in pipe fittings are generally expressed in terms of velocity heads


dFanning friction factor in case of turbulent flow of liquids in pipe depends upon relative roughness & Reynolds number



Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about ____________ percent?


a10-15


b25-30


c45-50


d65-70


View Answer 25-30

An example of recuperative furnace is the__________________?


aSoaking pit


bOpen hearth furnace


cCoke ovens


dNone of these


View Answer Soaking pit

Select the wrong statement pertaining to flow of an incompressible fluid through a Venturimeter ?


aFor frictionless flow, the fluid pressure entering the venturi meter will be exactly equal to that leaving the Venturimeter


bDischarge of fluid through a Venturimeter depends upon the gage difference irrespective of the orientation of Venturimeter


cVenturimeter occupies less space than an orificemeter


dVenturimeter incurs less power loss compared to an equivalent orificemeter



Select the correct statement?


aThe discharge through a Venturimeter depends upon Δp only and is independent of orientation of the meter


bA Venturimeter with a given gage difference discharges at a greater rate, when the flow is vertically downward through it, than when the flow is vertically upward


cFor a given pressure difference, the discharge of gas is greater through a Venturimeter, when compressibility is taken into account, than when it is neglected


dThe overall pressure loss is the same in a given pipe line, whether a Venturimeter or a nozzle with the same throat dia is used



In a furnace employing forced draught as compared to induced draught______________________?


aAir is sucked in, so air leaks are more and hence the furnace efficiency is reduced


bThe fan operates hot and hence blades are liable to corrosion and erosion


cPositive pressure exists in the furnace


dNone of these



Dehydration of ammonium carbamate (to produce urea) is a/an _____________ reaction?


aReversible


bCatalytic


cExothermic


d Endothermic


View Answer Endothermic

Potassic fertiliser is graded based on its ______________ content?


a KCl


bK2O


cKNO3


dK2SO4


View Answer K2O

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