Chemical Engineering MCQs

Page No. 11

Metallic recuperators are not used for waste heat recovery, if the hot flue gas temperature is above _____________ °C, because corrosion prevails at higher temperatures?


a350


b750


c1050


d1250


View Answer 750

In practical operation of any furnace, zero oxygen percentage or theoretical CO2 percentage in flue gas is rarely achieved, because of__________________?


aUse of non-preheated combustion air


bUse of pulverised solid fuels


cImperfect mixing of fuel & air and infiltration of air


dUse of excessive positive draft in the furnace



Which of the following is a heat treatment furnace ?


aMuffle furnace


bAnnealing furnace


cReheating furnace


dRotary kiln


View Answer Annealing furnace

An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called ____________ furnace?


aResistance


bArc


cLow frequency induction


dNone of these


View Answer Arc

Size of the combustion chamber of a furnace depends upon the ___________________?


aHeat release rate of the fuel


bPreheat temperature of fuel & air


cMethod of mixing the fuel & air


dAll A., B. and C.


View Answer All A., B. and C.

To reduce the stack loss, heat recovery from flue gas can be done by_____________________?


aPreheating of cold stock


bPreheating of combustion air


cSteam generation in waste heat boilers


dAll A., B. and C.


View Answer All A., B. and C.

Pick out the wrong statement about a streamline ?


aIt is always parallel to the main direction of the fluid flow


bIt is a line across which there is no flow and it is equivalent to a rigid boundary


cStreamlines intersect at isolated point of zero velocity and infinite velocity


dThe fluid lying between any two streamlines can be considered to be in isolation and the streamline spacing varies inversely as the velocity



Pick out the wrong statement?


aThe form drag is dependent upon the occurrence of a wake


bThe shear stress at any given cross-section of a pipe for steady flow (either laminar or turbulent) varies linearly as the radial distance


cAn ideal fluid is the one, which has negligible surface tension and obeys the Newton’s law of viscosity


dExistence of the boundary layer in fluid flow is because of viscosity of the fluid.



_____________ furnace is not an electric furnace?


aArc


bInduction


cPot


dResistance


View Answer Pot

The advantages of firing pulverised coal in the furnace lies in the fact that, it_____________________?


aPermits the use of high ash content coal


bPermits the use of low fusion point ash coal


cAccelerates the burning rate and economises on fuel consumption


dAll A., B. and C.



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