chemical engineering chemical engineering basics MCQs – Page 2

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 Review each marked answer and report any item that may be outdated or unclear.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
21. Good design of the casing of a centrifugal pump aims at minimising the __________________________?
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A. Cavitation

B. Frictional losses

C. Kinetic energy loss

D. Static head

22. Damage to metal surface by mechanical action is called____________________?
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A. Erosion

B. Pitting

C. None of these

D. Corrosion

23. In the formation of cermets, the ratio of ceramic material to metallic material is usually 80:20. Which of the following is a cermet ?
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A. Alumina

B. Bakelite

C. Tungsten carbide

D. Zirconia

24. Bad odour in sanitary latrines is reduced by periodically sprinkling_____________________?
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A. Lime powder

B. Bleaching powder

C. None of these

D. Aluminium sulphate

25. A reduction in thermal resistance during heat transfer does not occur in the___________________?
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A. None of these

B. Conduction heat transfer by reduction in the material thickness and increase in the thermal

C. Radiation heat transfer by increasing the temperature and reducing the emissivity

D. ductivity

E. Convection heat transfer by stirring the fluid and cleaning the heating surface

26. Quartz is a ________________ material ?
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A. Ferromagnetic

B. Piezoelectric

C. Diamagnetic

D. Ferroelectric

27. During decarburising of a plain carbon steel, the thickness of ferrite layer growth is proportional to____________________?
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A. Cube of time

B. Time

C. Square root of time

D. Square of time

28. Oxide layer formed on the non-ferrous metal surface after its annealing is__________________?
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A. Left as such to protect the surface

B. Removed by acid pickling

C. Hammered into the surface

D. Removed with coarse emery cloth

29. Brazing is the joining of metals_____________________?
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A. Without melting the base metal

B. With a non-ferrous filler

C. Both A. & B.

D. Neither A. nor (B)

30. The refractory lining of the bottom in a basic electric arc furnace is made of___________________?
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A. Alumina

B. Magnesia

C. Silica

D. Fireclay

31. At the point of boundary layer separation in fluid flow, the _____________________?
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A. Shear stress is maximum

B. Velocity gradient is flat

C. Shear stress is zero

D. Density variation is maximum

32. Addition of _______________ to steel does not help in improving its machinability ?
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A. Phosphorous

B. Silicon

C. Sulphur

D. Lead

33. M10 index of coke indicates its____________________?
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A. Impact strength

B. Abrasion resistance

C. Compressive strength

D. Hardness

34. Runge-Kutta method is used to solve a/an __________________________?
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A. Linear differential equation

B. None of these

C. Simultaneous non-linear equation

D. Ordinary differential equation of nth order

35. Increasing sulphur content in pig iron tends to make it ________________?
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A. Hard

B. Ductile & malleable

C. Tough

D. Soft

36. Oxyacetylene reducing flame is used while carrying out welding on___________________?
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A. Mild steel

B. High carbon steel

C. Alloy steel

D. Grey cast iron

37. Which of the following is an ore dressing operation ?
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A. Smelting

B. Roasting

C. None of these

D. Classification
38. Heating the Hypo-eutectoid steels to 30C 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_______________________?
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A. Tempering

B. Normalising

C. Hardening

D. Annealing
39. Nickel and ______________ are the alloying element added in steel to increase its toughness?
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A. Silicon

B. Vanadium

C. Chromium

D. Molybdenum

40. Increase in the entropy of a system represents the_____________________?
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A. Decrease in system pressure

B. Increase in the availability of energy

C. Degradation of energy

D. Increase in the temperature