chemical engineering MCQs – Page 364

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 Review each marked answer and report any item that may be outdated or unclear.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
7261. Molten phthalic anhydride is stored in a/an _______________ vessel?
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A. Lead lined steel

B. Glass lined steel

C. Nickel clad steel

D. Aluminium
7262. Hardened steel is softened by___________________?
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A. Normalising

B. Annealing

C. Tempering

D. Carburising

7263. Hydrochloric acid is stored in a _____________ steel vessel?
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A. Rubber lined

B. Lead lined

C. Glass lined

D. Stainless

7264. Which of the following alloy steels is the most suitable for making gun barrels and projectiles ?
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A. Molybdenum steel

B. Cobalt steel

C. Nickel-chrome steel

D. Tungsten steel

7265. SO3 is absorbed using H2SO4 in a____________________?
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A. None of these

B. Stainless steel plate tower

C. Packed steel tower lined with acid proof bricks

D. Cast iron packed tower

7266. Approximate value of the modulus of elasticity for steel is about _____________ 106kg/cm2?
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A. 2

B. 0.5

C. 40

D. 75

7267. In a heating process, a heat flow diagram in which the quantities of heat in the various items of a heat balance are represented by the width of a band is called the__________________?
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A. Cox chart

B. Sankey diagram

C. None of these

D. Ostwald chart

7268. Heat transfer rate to the stock/charge in the furnace does not depend upon the________________?
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A. Size of the furnace

B. Emissivity of the refractory walls

C. Thickness of the stock

D. Use of waste heat recovery equipments
7269. In order to maintain an oxidising atmosphere in a furnace, it should have__________________?
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A. More of CO2 in flue gas

B. More of CO in flue gas

C. More of excess air

D. Less of excess air

7270. Use of pulverised coal in boilers provides____________________?
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A. Higher calorific value

B. Better combustion

C. Less erosion on furnace wall

D. Smokeless burning

7271. The reason for excessive clinker formation in gas producers is the_____________________?
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A. Use of fuel having too low an ash fusion temperature

B. Development of hot spots in the fuel bed and an abnormally high rate of gasification

C. Use of coal/coke containing a high % of fines and ash

D. All A., B. and C.
7272. Pick out the wrong statement?
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A. Carbon refractories cannot be used in the furnaces operating under reducing conditions

B. Sand & coke is the main raw material for the manufacture of silicon carbide

C. Silica occurs in nature in all cellular, amorphous or crystalline form

D. Mullite can be obtained by the heating of alusite, kyanite or sillimanite

7273. Copper has very low________________?
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A. Tensile strength

B. Thermal & electrical conductivity

C. Malleability

D. Ductility

7274. In low or standard frequency induction furnace, heat is produced by the_______________________?
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A. Current flow through a heating element

B. Induction and resistance

C. None of these

D. Combination of induced current and skin effect

7275. All materials obey Hookes law within elastic limit. When elastic limit is reached, the tensile strain__________________?
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A. Decreases in proportion to stress

B. Decreases very quickly

C. Increases in proportion to stress

D. Increases very quickly
7276. _____________ furnace is not an electric furnace?
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A. Induction

B. Arc

C. Resistance

D. Pot
7277. Protective gas used in the annealing furnace for steel coil comprises of__________________?
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A. 100% CO

B. 5% H2 + 9% N2

C. 95% N2 + 5% H2

D. 100% H2

7278. The hardest material just prior to diamond in Mhos scale is___________________?
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A. Calcite

B. Corundum

C. Topaz

D. Carborundum

7279. The advantages of firing pulverised coal in the furnace lies in the fact that, it_____________________?
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A. Accelerates the burning rate and economises on fuel consumption

B. All A., B. and C.

C. Permits the use of high ash content coal

D. Permits the use of low fusion point ash coal

7280. Presence of silicon in steel_____________________?
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A. Indicates that steel is not deoxidised properly

B. None of these

C. Decreases the blow holes formation tendency in castings

D. Is in the form of free Si