chemical engineering chemical engineering basics MCQs – Page 15

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 Review each marked answer and report any item that may be outdated or unclear.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
281. Hollow shafts can be made as strong as solid shafts by making the twisting moments of both the shafts same. Shafts made by _____________ have residual stresses ?
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A. Cold rolling

B. Hot rolling

C. Forging

D. Casting

282. Which of the following alloying elements is present in maximum percentage in high speed steel ?
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A. Molybdenum

B. Chromium

C. Tungsten

D. Vanadium

283. Tin based white metals are used, where bearings are subjected to___________________?
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A. High temperature

B. High pressure & load

C. Low pressure & load

D. Large surface wear

284. Wrought iron is never shaped by__________________?
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A. Cold working

B. Casting

C. Forging

D. Welding

285. The elastic strain in copper is due to the__________________?
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A. Stretching of atomic bonds

B. Motion of dislocations

C. Breakage of atomic bonds

D. None of the above

286. The normal stress is the same in all directions at a point in a fluid, only when the fluid__________________?
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A. Is at rest & has zero viscosity

B. is incompressible & frictionless

C. Is frictionless

D. Fluid layer has no motion relative to an adjacent layer of fluid

287. Change in volume of metals from absolute zero temperature to their melting points is___________________?
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A. Almost same for all metals

B. Different for different metals

C. Less for low melting point metals

D. Less for high melting point metals

288. What is the pH of distilled water ?
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A. 14

B. 7

C. 0

D. 1

289. Use of water as a manometric liquid suffers from the disadvantage of its____________________?
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A. Corrosive nature

B. High vapour pressure

C. High boiling point

D. Low vapour pressure

290. _____________________ of austenite decreases the hardenability in steel ?
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A. Homogeneity

B. Dissolved elements (except cobalt)

C. Fine grains

D. Coarse grains

291. ____________________ of hard alloy and tool steel is done to make it easily machinable ?
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A. Tempering

B. Normalising

C. Annealing

D. Case carburising

292. Steel balls are manufactured by_____________________?
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A. Casting

B. Cold heading

C. Sintering

D. Spinning

293. The product (s) of roasting of a sulphide ore is (are) ?
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A. Sulphate only

B. Oxide only

C. Dependent on temperature and partial pressure of oxygen & sulphur dioxide

D. Oxide and sulphate

294. Air/fuel ratio by weight for combustion of methane with theoretical quantity of air will be about ____________________?
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A. 29:01:00

B. 23:01

C. 9:01

D. 17 : 1
295. Shrinkage allowance on pattern is provided to compensate for shrinkage when the _____________________?
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A. Solid phase temperature drops from freezing temperature to the room temperature

B. Liquid metal temperature drops from pouring temperature to room temperature

C. Metal changes from liquid state to solid state at freezing temperature

D. Liquid metal temperature drops from pouring temperature to freezing temperature

296. 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. 15 to 25

B. 45 to 50

C. 75 to 80

D. 5 to 10

297. Atomic _________________ of an element is a whole number ?
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A. Weight

B. Number

C. Volume

D. Radius

298. Strain hardening effect in metals subjected to cold working is due to the _______________ mechanism?
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A. Dislocation

B. Slip

C. Fracture

D. Winning

299. Carbon supply in pack carburising process is in the form of ___________________?
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A. Charcoal

B. Graphite

C. Hydrocarbon oil

D. Calcium carbide

300. The approximate height of a blast furnace having a useful volume of 2000 m3 is about _______________ metres ?
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A. 25

B. 75

C. 35

D. 55