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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