chemical engineering MCQs – Page 371

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 Review each marked answer and report any item that may be outdated or unclear.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

7401. In the Contact process of sulphuric acid manufacture, 98% acid cooler is made of_____________________?
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A. Rubber lined steel

B. Stainless steel

C. Lead lined steel

D. Cast iron

7402. Hardening of steel is not possible unless it is heated ______________ critical point?
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A. Above the highest

B. Between the second & third

C. Between the first & second

D. Above the lowest

7403. Residual magnetism in steel for magnets is increased by the addition of__________________?
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A. Cobalt

B. Chromium

C. Tungsten

D. Nickel

7404. Rubber lined pumps can be used to pump_________________?
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A. Hypochlorous acid

B. All A., B. and C.

C. Chlorinated brine

D. Caustic soda

7405. Furnace aerodynamics is related to the _____________ in the furnace?
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A. Pressure adjustment

B. Movement of gases

C. Temperature control

D. Measurement of flue gas volume

7406. Concrete tank can be used to store________________?
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A. Alum

B. Ferrous sulphate

C. Saturated brine

D. Sulphuric acid

7407. The thermal efficiency of an air/fuel gas preheating recuperator may be as high as _____________ percent?
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A. 65

B. 99

C. 85

D. 50

7408. Silico-manganese steels (containing 0.7% Mn, 0.5% C and 2% Si)___________________?
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A. Do not require heat treatment for any of its applications

B. Do not have good resilience properties

C. Is tempered at 850C

D. Are used for leaf and coiled springs

7409. Pick out the wrong statement?
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A. The form drag is dependent upon the occurrence of a wake

B. Existence of the boundary layer in fluid flow is because of viscosity of the fluid.

C. An ideal fluid is the one, which has negligible surface tension and obeys the Newtons law of viscosity

D. The shear stress at any given cross-section of a pipe for steady flow (either laminar or turbulent) varies linearly as the radial distance

7410. An example of recuperative furnace is the__________________?
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A. Coke ovens

B. None of these

C. Open hearth furnace

D. Soaking pit

7411. Which of the following has the least carbon percentage ?
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A. Low carbon steel

B. Wrought iron

C. White cast iron

D. Mild steel

7412. Shaft furnaces are used for_______________________?
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A. Calcining

B. Smelting

C. Roasting

D. All A., B. and C.

7413. The heating capacity of muffle furnace depends on the_________________?
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A. Surface area & emissivity of the stock

B. Properties of the muffle wall (temperature, area, and emissivity)

C. Both A. & B.

D. Neither A. nor B.

7414. Addition of _____________ in steel can help in increasing the depth of hardness?
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A. Vanadium

B. Chromium

C. Tungsten

D. Nickel

7415. Interchain forces are the weakest in case of________________?
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A. Plastics

B. Fibres

C. Elastomers

D. Both rubber & elastomers

7416. Turn down ratio of a burner____________________?
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A. Is the ratio of maximum to minimum permissible heat input rates

B. Should be 1:1 for a batch type furnace

C. Should be as low as possible i.e., 1 : 2

D. Is normally much more for a continuous furnace as compared to a batch furnace

7417. Soaking pits are meant for heating steel_________________?
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A. Coils

B. Sheets

C. Slabs

D. Ingots

7418. Turndown ratio of a burner gives an idea of the ______________ in the furnace?
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A. Minimum heat input rate only

B. Maximum heat input rate only

C. Range of fuel firing rates

D. Volume of the combustion chamber

7419. Thickness of stock does not affect the fuel economy of furnaces, if the material to be heated is of__________________?
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A. Low emissivity

B. High thermal conductivity

C. Both A. and B.

D. Neither A. nor B.

7420. Presence of high phosphorous in cast iron increases its____________________?
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A. Shrinkage

B. Tensile strength

C. Melting point

D. Fluidity

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