chemical engineering chemical engineering basics MCQs – Page 24

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 Review each marked answer and report any item that may be outdated or unclear.

chemical engineering chemical engineering basics Mcqs
461. Resistance of an electrical conductor is proportional to its (where, l = length and A = crosssectional area of the conductor)________________?
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A. A

B. l

C. A2

D. Both A. & B.
462. Maximum permissible air velocity in pipelines is about ______________ metre/second ?
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A. 10

B. 20

C. 5

D. 40

463. Hot extrusion of aluminium is done in the temperature range of ________________ C ?
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A. 450-500

B. 350-400

C. 550-600

D. 250-300

464. The two elements required to form substitutional solid solution should not have___________________?
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A. Same valency

B. Same crystalline structure

C. Same atomic sizes

D. Widely differing electronegativity
465. On oscilloscope screen for dynamic measurement, lissajous diagram is normally used to determine the ______________ of the input signal?
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A. None of these

B. Frequency

C. Amplitude

D. Damping

466. Ultimate strength in tension as compared to that in shear for steel is____________________?
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A. One third

B. Half

C. One and half times

D. One fourth

467. If a nuclear reactor produces more fissile nuclear fuel than it consumes, then it is called a _____________ reactor?
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A. Critical

B. Breeder

C. Fertile

D. Heterogeneous

468. Out of the following, the ________________ pipe has the least corrosion resistance?
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A. Mild steel

B. Cast iron

C. Copper

D. Wrought iron
469. Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity) ____________________?
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A. 1/k

B. k

C. 1/k2

D. k2

470. Thermal conductivity of a material does not depend upon its_____________________?
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A. Surface area

B. All A, C & C

C. Mass

D. Volume

471. Pick out the wrong statement about coating/electroplating of metals ?
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A. Phosphate coating is used as an excellent base for paints & enamels

B. Calorising is the process of coating steel with chromium

C. The base metal to be electroplated is normally made the cathode of the electrolytic cell and

D. Phosphate coating is less corrosion resistant than chromate coating

E. ting metal is made the anode

472. For efficient performance of a blast furnace, the extent of reduction of Wustite (FeO) should be___________________?
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A. 50-60% indirect reduction

B. 30-40% indirect reduction

C. 100% direct reduction

D. 100% indirect reduction

473. Pick out the correct statement?
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A. Normalising of a material induces stresses

B. Hot worked materials are subjected to annealing to remove internal stresses

C. Annealing of steel hardens it slightly

D. Tempering of a material improves ductility & toughness but reduces hardness & brittleness
474. For the Stokes law to be valid in the case of a falling sphere in a fluid, the_____________________?
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A. Reynolds number (based on sphere diameter) should be < 1

B. Flow around the sphere should be in turbulent region

C. Fluid density should be constant

D. Sphere must be metallic
475. Identify the false statement?
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A. Pitting corrosion is usually very localised

B. Stress corrosion cracking is facilitated by tensile stress

C. Hydrogen embrittlement is facilitated by tensile stress

D. Martensitic steels are less susceptible to pitting corrosion than austenitic steels
476. Pick out the wrong statement ?
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A. ding

B. te thickness to be welded)

C. Mild steel sheet cannot be spot welded

D. Seam welding, projection welding & spot welding are the classification of electrical resistance

E. Electrode tip in spot welding is of copper and the tip diameter should be equal to t (where, t =

F. In spot welding, two pieces to be joined are overlapped and placed between two electrodes

477. Velocity of a gas in sound is not proportional to (where, T = Absolute temperature of the gas. P = Absolute pressure of the gas. y = Ratio of specific heats (Cp/Cv) ? = specific weight of the gas) ?
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A. 1/??

B. 1/?P

C. ?y

D. ?T

478. Multistage compression of air as compared to single stage compression offers the advantage of______________?
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A. Increased volumetric efficiency

B. Moisture elimination in the inter-stage cooler

C. All A , B. & C.

D. Power saving per unit weight of air delivered

479. Optical activity is a/an _______________________ property ?
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A. Additive

B. Constitutive

C. Both A. & B.

D. Neither A. nor B.

480. Coarse grained steels have____________________?
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A. Low toughness

B. Very high toughness

C. No tendency to distort

D. High density