Chemical Engineering MCQs

Page No. 28

Pick out the wrong statement?


aBronze is an alloy of copper & tin


bBrass is an alloy of copper & zinc


cThe alloy named ‘German silver’ does not contain any silver


dThe ability of a material to fracture without appreciable deformation is called its ductility



Shaft furnaces are used for_______________________?


aSmelting


bCalcining


cRoasting


dAll A., B. and C.


View Answer All A., B. and C.

Reheating furnace (pusher type) is used for heating_____________________?


aIngots


bSlabs


cSteel coils


dSteel sheets


View Answer Slabs

Acid dew point temperature (ADT) of a flue gas produced by the combustion of a fuel containing 1% sulphur may be about ____________ °C?


a80


b130


c180


d250


View Answer 130

Protective gas used in the annealing furnace for steel coil comprises of__________________?


a95% N2 + 5% H2


b5% H2 + 9% N2


c100% CO


d100% H2


View Answer 95% N2 + 5% H2

Artificial draught produced by a fan in the furnace can be controlled by the___________________?


aSpeed of the fan


bDamper


cVariation in the pitch of fan blades


dAll A., B. and C.


View Answer All A., B. and C.

Which of the following is the most suitable for preheating combustion air above 650°C ?


aRegenerator


bMetallic recuperator


cCeramic recuperator


dNone of these


View Answer Ceramic recuperator

The electric furnace in which heat is produced by a combination of induced current and skin effect is called _____________ furnace?


aArc


bResistance


cLow frequency induction


dHigh frequency induction



Thermal efficiency of an open hearth furnace may be about _____________ percent?


a5


b20


c50


d80


View Answer 20

Which of the following is not a directly fired furnace ?


aBy-product coke oven


bCalcination kiln


cSintering furnace


dOpen hearth furnace


View Answer By-product coke oven

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