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chemical engineering MCQs

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 Review each marked answer and report any item that may be outdated or unclear.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
1. The thermodynamic law, PVy = constant, is not followed by the __________________?
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A. Ideal compression of air

B. Free expansion of an ideal gas

C. Adiabatic expansion of steam in turbine

D. Adiabatic compression of air

2. About _________________ ton of coke is required in a cupola to produce one ton of casting ?
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A. 0.8

B. 1.5

C. 0.03

D. 0.3
3. Minimum number of members required to form a Public Limited Joint Stock Com-pany is___________________?
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A. 12

B. 10

C. 17

D. 7
4. Drills are usually made of__________________?
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A. Alloy steel

B. Cermets

C. Tungsten carbide

D. High speed steel
5. Broaching tools are usually made of____________________?
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A. Cermets

B. High speed steel

C. Tungsten carbide

D. Stellite

6. The heat of neutralisation remains constant, when there is a reaction between dilute solutions of strong _____________________?
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A. None of these

B. Acid and weak base

C. Base and strong acid

D. Base and weak acid

7. Volume of blast furnace slag is about _______________ times the volume of hot metal (pig iron) of the same weight ?
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A. 5

B. 3

C. 7

D. 1.5

8. The elastic strain energy of a unit length of an edge dislocation as compared to that of a screw dislocation is____________________?
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A. More

B. Equal

C. Less

D. Double

9. Which of the following approaches the ideal gas behavior most closely ?
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A. Saturated water

B. Superheated steam

C. Wet steam

D. Saturated steam

10. The lightest non-inflammable gas is_________________?
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A. O2

B. H2

C. Ar

D. He
11. Alloying elements present in Haynes stellite, which has superior performance than high speed steel, are____________________?
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A. Tungsten, chromium & cobalt

B. Nickel, cobalt & chromium

C. Manganese, chromium & cobalt

D. Tungsten, molybdenum & nickel

12. The dew point of moist air becomes ____________________ with decrease in its relative humidity ?
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A. Less than the wet bulb temperature

B. Equal to wet bulb temperature

C. More than the dry bulb temperature

D. More than the wet bulb temperature

13. Which of the following is not the function of a volute casing provided in a centrifugal pump ?
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A. stant velocity

B. To collect liquid from the periphery of the impeller and to transmit it to the delivery pipe at

C. To increase the pump discharge rate

D. To increase the pump efficiency

E. To reduce the head loss in discharge

14. In case of condensers & evaporators operating under given terminal conditions, LMTD (logarithmic mean temperature difference) for counter flow as compared to that for parallel flow is__________________?
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A. Much more

B. Equal

C. More

D. Less

15. Unit of surface tension in S.I. unit is_________________?
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A. Joule/m

B. Joule/m2

C. Newton/m2

D. Watt/m

16. Boiling point of water gets lowered at high altitudes (e.g., hills), because ___________________?
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A. Temperature is low

B. Atmospheric pressure is high

C. Atmospheric pressure is low

D. None of these

17. Between 230 and 370C, blue brittleness is caused in mild steel because of the_________________?
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A. Increase in Youngs modulus

B. Immobility of dislocation

C. Strain hardening

D. Strain-ageing
18. Which of the following metals cannot be hot worked at room temperature ?
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A. Tin

B. Zinc

C. Lead

D. Nickel
19. The function of neutral flux used in the pyrometallurgy of metal extraction is to increase the _____________ of the slag ?
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A. Basicity

B. Acidity

C. Viscosity

D. Fluidity
20. Colour comparator is used to measure the___________________?
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A. Colour intensity

B. Electrode potential

C. None of these

D. pH value
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

41. Laser welding is widely employed in the __________________ industries ?
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A. Process

B. Electronic

C. Heavy

D. Structural

42. Case hardening is not done by________________?
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A. Nitriding

B. Hot dipping

C. Electroplating

D. Both B & C
43. ______________ joint is usually used for joining cast iron pipes mostly used for temporary pipelines, where it may be necessary to dismantle & reassemble the pipeline very frequently ?
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A. Bell and Spigot

B. Expansion

C. Collar

D. Flanged
44. The joint for soldering is supported by binding wire made of ____________________?
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A. Stainless steel

B. Mild steel

C. Copper

D. Soft iron
45. Which of the following varies as the square root of oil pressure during atomisation of fuel oil through a pressure jet burner ?
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A. Output & fineness

B. Velocity

C. Both A. & B.

D. None of these

46. Alcohols are not suitable as diesel engine fuel because the cetane number of alcohols is____________________?
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A. Zero

B. Very low which prevents their ignition by compression

C. None of these

D. Very high which prevents their ignition by compression

47. In Imperial Smelting Process for extraction of zinc, zinc vapour thus produced is quenched in the external condenser by the use of the following _______________________?
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A. Mixture of water and air

B. Rain of molten lead

C. Jet of water at high pressure

D. Blast of air

48. Factor of safety is the ratio of the ___________________ stress to the working stress?
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A. Bearing

B. Yield

C. Tensile

D. Compressive

49. Tumbling is the process of improving the ________________ of the materials/parts ?
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A. Surface cleanliness

B. Fatigue limit

C. Creep limit

D. Surface finish

50. Unit of viscosity in CGS system is_______________________?
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A. gm .cm-1 sec-1

B. gm .cm-2, sec-1

C. gm . cm . sec-1

D. gm . cm2 . sec-2