chemical engineering MCQs – Page 2

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 Review each marked answer and report any item that may be outdated or unclear.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

21. Which of the following is the most suitable abrasive for grinding high tensile strength materials ?
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A. Aluminium oxide

B. Silicon carbide

C. Corundum

D. Boron carbide

22. Hot extrusion process is not used for making____________________?
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A. Aluminium curtain rods

B. Any of these

C. Cast iron pipe for domestic water supply

D. Stainless steel tubes used in furnitures

23. To counteract the bad effects of strain hardening on a cold formed part, it must be ______________________?
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A. Annealed

B. Hardened

C. Normalised

D. Tempered

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

B. Degradation of energy

C. Increase in the temperature

D. Increase in the availability of energy

25. Damage to metal surface by mechanical action is called____________________?
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A. None of these

B. Corrosion

C. Erosion

D. Pitting

26. Leakage in a cooking gas cylinder is detected by___________________?
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A. Pungent smell of mercaptans present in the gas

B. Radio-isotopes

C. Halide torch

D. Pouring soap solution on the surface and locating the gas bubbles

27. Material of construction of foundry crucible is _________________?
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A. Graphite

B. Cast iron

C. Lead

D. Stainless steel

28. In practice, the compression ratio of compression-ignition (CI) engine ranges from ______________________?
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A. 5 to 10

B. 15 to 25

C. 60 to 70

D. 40 to 55

29. With increase in ___________________ Knocking tendency in a spark ignition petrol engine decreases?
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A. Engine speed

B. Wall temperature

C. Compression ratio

D. Supercharging

30. Which of the following is prone to cup and cone fracture ?
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A. Cast iron

B. Flat tensile specimen of ductile metal

C. Soft brass

D. Round specimen of ductile metal

31. Good design of the casing of a centrifugal pump aims at minimising the __________________________?
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A. Cavitation

B. Kinetic energy loss

C. Frictional losses

D. Static head

32. Which of the following is normally not found in both the S.I. (petrol) & C.I. (diesel) engines ?
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A. Air filter

B. Exhaust silencer

C. Fuel injector

D. Battery

33. Which of the following metals reacts violently with water ?
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A. Calcium

B. Magnesium

C. Sodium

D. Mercury

34. Pick out the correct combination about the role of various additives used in polymers ?
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A. Lubricants: increases the flexibility of polymers

B. Plasticiser: increases the polymer strength

C. Heat stabiliser: increases the maximum service temperature

D. Fillers: Does not affect the property of polymer but increases its weight

35. In an amorphous material, atoms defy any definite atomic structure and exist in random pattern just like in liquid. Which of the following is an amorphous material ?
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A. Lead

B. Tin

C. Glass

D. Zinc

36. Breakeven point represents the condition, when the company runs under no profit no loss condition. In break even analysis, total cost comprises of fixed cost________________?
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A. Plus variable cost

B. Only

C. Plus selling expenses

D. Plus overhead cost

37. Brittleness induced due to the presence of sulphur in steel can be reduced by adding____________________?
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A. Vanadium

B. Magnesium

C. Copper

D. Manganese

38. Steel is welded using the ________________ flame ?
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A. Neutral

B. Oxidising

C. All A, B. & C

D. Carburising

39. The malleability of a material is the property by virtue of which it can be rolled or hammered into thin sheets. Which of the following materials has the maximum malleability ?
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A. Aluminium

B. Wrought iron

C. Lead

D. Copper

40. Powder metallurgy technique is used in the production of ____________________ tools ?
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A. Drilling

B. Tungsten carbide

C. High speed steel

D. High carbon steel

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