chemical engineering MCQs – Page 374

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs
7461. The purpose of nitriding the steel is to___________________?
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A. Harden its surface

B. Soften its surface

C. Improve its reliability

D. None of these

7462. Thermal efficiency of an open hearth furnace may be about _____________ percent?
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A. 5

B. 50

C. 80

D. 20
7463. Maximum heat transfer in high temperature furnaces is by____________________?
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A. Conduction

B. Either A., B. or C.; depends on the type of furnace

C. Radiation

D. Convection

7464. Ingress of cold air in the furnaces through cracks, charging doors, openings etc ________________?
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A. Reduces the flue gas temperature and makes the furnace atmosphere oxidising

B. All A., B. and C.

C. Reduces the furnace draught

D. Increases the load on the induced draft fan

7465. Sulphur melting pit in the sulphuric acid plant is made of__________________?
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A. Hard wood

B. Cast iron

C. Lead lined stainless steel

D. Steel or cement-brick lined
7466. H2SO4 (< 50% concentration) is corrosive to_________________?
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A. Copper, cast iron & high silicon iron (14% Si)

B. Rubber (butyl and hard), silicone rubber & Teflon

C. Aluminium, mild steel, stainless steel, concrete & tin

D. Glass, graphite, porcelain & stoneware

7467. Flue gas outlet temperature from the chimney of any furnace should be ideally about ______________ C?
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A. 100

B. 50

C. 150

D. 250

7468. Heat balance of furnace provides means of determining the_________________?
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A. Thermal efficiency of the process

B. Sources of heat losses

C. All A., B. and C.

D. Scope of reduction of heat losses

7469. Thermal shield used in high powered nuclear reactor to protect the walls of the reactor from radiation damage is made of___________________?
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A. Concrete

B. Graphite

C. Zircaloy

D. Steel
7470. The impure iron (pig iron) that is tapped out from blast furnace contains about _____________ percent carbon?
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A. 8

B. 4

C. 0.2

D. 2

7471. Which of the following is not a continuous waste heat recovery equipment from the flue gases going out of furnace ?
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A. Waste heat boiler

B. Regenerator

C. Ceramic recuperator

D. Economiser

7472. Which of the following is not a recuperative furnace ?
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A. Soaking pit

B. Steam boiler

C. Coke oven

D. Reheating furnace

7473. Thermal efficiency of a limestone calcination rotary kiln may be around ______________ percent?
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A. 80

B. 40

C. 20

D. 65

7474. Liquid ammonia is shipped in _____________ containers?
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A. Aluminium

B. Steel

C. Glass

D. Lead lined

7475. Which of the following pairs of elements may form an alloy ?
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A. None of these

B. Iron & mercury

C. Iron & carbon

D. Platinum & mercury

7476. Lead_________________?
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A. Is the lightest metal in common use

B. Cannot be work hardened

C. Is the hardest metal in common use

D. Cannot be scratched by finger nails

7477. Zinc is not used__________________?
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A. For producing zinc base die casting alloys

B. As an alloying element in various bronzes

C. In its oxide form as pigments

D. As anode for corrosion prevention in boiler

7478. Evaporators used in caustic soda recovery and production plant are made of_______________?
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A. Babbitt metal

B. Gun metal

C. Wood metal

D. Monel metal
7479. Fatigue strength of a material increases by_____________________?
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A. Under stressing the specimen

B. Having notches in the specimen

C. Having scratches on the surface

D. Rise in temperature

7480. Which is a continuous furnace ?
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A. None of these

B. Glass tank furnace

C. Coke ovens

D. Annealing furnace