Chemical Engineering MCQs

6108 MCQs  (Page 33 of 611)

Attempt Chemical Engineering Quiz
Maximum hardenability of steel depends upon its_______________________?
A. Chemical composition
B. Carbon content
C. Grain size
D. Alloying elements content
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Electrical conductivities of semi-conductors are of the order of ______________ ohm/cm ?
A. 10-3
B. 103
C. 10-15
D. 1015
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The difference in one unit of Rockwell hardness number corresponds to a difference in the depth of indentation of ______________ mm ?
A. 0.001
B. 0.01
C. 0.002
D. 0.02
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Heating the Hypo-eutectoid steels to 30°C above the upper critical temperature line, soaking at that temperature and then cooling slowly to the room temperature to form a pearlite & ferrite structure is called_______________________?
A. Tempering
B. Hardening
C. Annealing
D. Normalising
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Evaporative cooling process employs a combination of cooling and humidification in which the____________________?
A. Sensible heat is added
B. Sensible heat is removed and the latent heat is added
C. Latent heat is removed
D. Sensible heat is added and latent heat is removed
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Heat transfer to the water wall in a high pressure water wall type boiler furnace is mainly by_________________?
A. Conduction
B. Convection
C. Radiation
D. Both a. & b.
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Nitriding of a steel part does not increase its__________________?
A. Grain size
B. Fatigue limit
C. Surface hardness
D. Wear resistance
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Chromium molybdenum steel cannot be welded using ______________ welding ?
A. Thermit
B. Electrical resistance
C. Oxy-acetylene
D. Any of these
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Which of the following fastening devices has a head at one end and a nut fitted to the other ?
A. Bolt
B. Stud
C. Top bolt
D. None of these
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The elastic strain in copper is due to the__________________?
A. Motion of dislocations
B. Stretching of atomic bonds
C. Breakage of atomic bonds
D. None of the above
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Word of the Day
24 Jul
Untenable
(especially of a position or view) not able to be maintained or defended against attack or objection.
ناقابل مدافعت، غیر مستحکم، جو دلیل سے ثابت نہ ہو سکے

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