Chemical Engineering MCQs

Page No. 28

Pick out the wrong statement?


aBronze is an alloy of copper & tin

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bBrass is an alloy of copper & zinc

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

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

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Shaft furnaces are used for_______________________?


aSmelting

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bCalcining

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cRoasting

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dAll A., B. and C.

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View Answer All A., B. and C.

Reheating furnace (pusher type) is used for heating_____________________?


aIngots

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bSlabs

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cSteel coils

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dSteel sheets

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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

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b130

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c180

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d250

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View Answer 130

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


a95% N2 + 5% H2

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b5% H2 + 9% N2

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c100% CO

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d100% H2

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View Answer 95% N2 + 5% H2

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


aSpeed of the fan

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bDamper

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cVariation in the pitch of fan blades

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dAll A., B. and C.

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View Answer All A., B. and C.

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


aRegenerator

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bMetallic recuperator

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cCeramic recuperator

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dNone of these

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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

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bResistance

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cLow frequency induction

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dHigh frequency induction

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


a5

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b20

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c50

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d80

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View Answer 20

Which of the following is not a directly fired furnace ?


aBy-product coke oven

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bCalcination kiln

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cSintering furnace

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dOpen hearth furnace

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View Answer By-product coke oven

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