chemical engineering MCQs – Page 20

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 Review each marked answer and report any item that may be outdated or unclear.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
381. Stainless steel is welded using__________________?
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A. Oxy-hydrogen flame

B. Arc welding

C. Inert gas arc welding

D. Oxy-acetylene flame

382. Which one of the following is incombustible ?
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A. C2H2

B. H2

C. CCl4

D. S

383. Induced draft fans provided in large thermal power plant boilers have __________________ blades?
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A. Forward curved

B. Radial or straight

C. Backward curved

D. Double curved

384. Glycerine is used as a coolant in cooling of some engines instead of water, because___________________?
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A. Smaller radiator can be used

B. Comparatively less weight of coolant is required

C. All a, b & c

D. Its higher boiling point (290C) increases its heat carrying capacity

385. The mechanism which changes the value of manipulated variable in response to the output signal from the control unit is called the___________________?
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A. On-off control

B. Floating control action

C. None of these

D. Final control element
386. Cementite is in the lamellar form in the _____________________ phase of steel ?
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A. Pearlitic

B. Bainitic

C. Ferritic

D. Martenistic

387. The difference in one unit of Rockwell hardness number corresponds to a difference in the depth of indentation of ______________ mm ?
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A. 0.02

B. 0.01

C. 0.001

D. 0.002
388. Wrought iron is never shaped by__________________?
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A. Welding

B. Casting

C. Forging

D. Cold working

389. Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative cooling is equal to the ______________ temperature of air?
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A. Dry bulb

B. Saturation

C. Dew point

D. Wet bulb
390. Energy of the sun arises mainly from __________________ reactions?
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A. Combustion

B. None of these

C. Fusion

D. Fission

391. The best guide to judge the general quality of water is the measurement of its__________________?
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A. pH value

B. Electrical conductivity

C. Dissolved oxygen content

D. Turbidity

392. _______________ is the hardest oxide and is hence used where high wear resistance at high temperature is required?
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A. Alumina

B. Zirconia

C. Beryllium

D. Magnesia

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

B. Breeder

C. Heterogeneous

D. Critical

394. The friction factor for the turbulent fluid flow in a rough pipe does not depend upon the_________________?
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A. Pipe roughness & pipe diameter

B. Fluid velocity

C. Type of flowing fluid

D. Both B. & C.
395. Which of the following is an acidic constituent of B.F. slag ?
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A. FeO

B. CaO

C. SiO2

D. MgO

396. Primary designation of steel is based on its__________________?
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A. Hardness & tensile strength

B. Iron content

C. Alloying elements content

D. Carbon content

397. High speed steel tools retain their hardness upto a temperature of __________________ C?
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A. 900

B. 500

C. 1100

D. 750

398. A dense structure of grinding wheel is not used for the_____________________?
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A. Finishing cuts

B. Brittle materials

C. Ductile material

D. Hard materials

399. To improve the machinability of steel, it is generally subjected to _____________________?
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A. Tempering

B. Spheroidising

C. Normalising

D. Annealing

400. In troposphere (the weather domain), the temperature t at height h above the sea level in metres is given by (where, temperature at sea level is 15C and t is in C.) ?
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A. t = 15 + 0.0065 h

B. t = 15 0.0035 h

C. t = 0.0035 h 15

D. t = 15 0.0065 h