chemical engineering MCQs – Page 34

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 Review each marked answer and report any item that may be outdated or unclear.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
661. A material is capable of resisting softening at high temperature, because of its property termed as____________________?
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A. Hot hardness

B. Creep

C. Fatigue

D. Hot temper

662. Dislocation cross-slip is difficult in those materials, which have___________________?
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A. Large number of slip systems

B. Low stacking fault energy

C. High work hardening rate

D. Coarse grain size

663. Transformer cores are normally made from ______________________?
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A. High purity iron

B. Al-Ni-Co alloy

C. Grain oriented Fe-Si alloy

D. Soft ferrites

664. _________________ can replace tungsten in high speed steel ?
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A. Molybdenum

B. Vanadium

C. Cobalt

D. Chromium

665. Pick out the wrong statement about the machinability of metals. Machinability of a metal ?
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A. Decreases with increase in hardness, in general

B. Decreases with increase in strain hardening tendencies

C. Decreases with increases in tensile strength & decrease in grain size

D. Depend on the composition, microstructure and physical & mechanical properties

666. The cathode in an electrochemical cell always carries____________________?
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A. Zero charge

B. Positive charge

C. Negative charge

D. Positive or negative charge depending upon the nature of the cell

667. Large scale fire on fuel gas line is normally extinguished by________________?
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A. Steam

B. Nitrogen

C. Water

D. Foam

668. During sensible cooling of air, its wet bulb temperature ?
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A. Decreases but dew point remains constant

B. Increases but dew point remains constant

C. Increases & the dew point decreases

D. Decreases & the dew point increases

669. Non-ferrous alloys used for making cutting tools need not have high__________________?
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A. Toughness

B. Red hardness

C. Cutting speed

D. Abrasion resistance

670. Consideration of the creep is the most important in case of the_____________________?
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A. Cycle chain

B. Flywheel of steam engine

C. Blades of gas turbine

D. Piston of an I. C. engine

671. Magnesium is present in___________________?
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A. Hypo solution

B. Chlorophyll

C. None of these

D. Haemoglobin

672. High relative humidity decreases the evaporative process and as the temperature is increased, the relative humidity decreases. The comfort range for human body is the ambient temperature of 22 to 27C with relative humidity ranging from _______________ percent ?
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A. 75 to 80

B. 15 to 25

C. 45 to 50

D. 5 to 10

673. Electrometallurgical methods of metal extraction is normally used for those metals___________________?
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A. Which stands higher in the electrochemical series of the metal

B. All A, B. & C.

C. Whose oxide/ore is not reduced by carbon

D. Which fall in the category of alkali & alkaline earth metals

674. Titanium is produced by ___________________ of Ti Cl4 ?
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A. Magnesium reduction

B. Thermal dissociation

C. Calcium reduction

D. Electrolytic reduction

675. L.D. (Linz-Donawitz) converter is used in the production of____________________?
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A. Aluminium

B. Copper

C. Zinc

D. Steel
676. The condition of diffraction from a crystal is given by______________?
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A. n? = d Sin ?

B. ? = d Sin 2?

C. ? = 2d Sin 2?

D. n? = 2d Sin ?
677. Thermal conductivity of a material does not depend upon its_____________________?
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A. Volume

B. Surface area

C. All A, C & C

D. Mass

678. Percentage of argon (by volume) in dry atmospheric air is about________________?
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A. 0.57

B. 0.3

C. 0.94

D. 0.09

679. Pick out the wrong statement ?
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A. Martenistic transformation never goes to completion (i.e., 100%) at room temperature

B. Magnetic permeability of the diamagnetic material is less than one

C. Invar is a magnetic alloy

D. Weldability of high carbon steel is poorer compared to low carbon steel

680. A compact estimate about the amount of materials handling between various work stations is obtained from the_____________________?
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A. Gantt chart

B. Travel chart

C. String diagram

D. Bin chart