chemical engineering chemical engineering basics MCQs – Page 3

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 Review each marked answer and report any item that may be outdated or unclear.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

41. For a spontaneous natural process at constant temperature and pressure, the free energy of the system always____________________?
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A. Decreases

B. Increases to a maximum before decreasing

C. Remain constant

D. Increases

42. The process of removal of scale formed during hot rolling of steel is termed as_________________?
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A. Pickling

B. Shot blasting

C. Descaling

D. Skimming

43. ______________ circuit is most commonly used to measure strain with the help of a strain gauge?
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A. Voltage balancing potentiometric

B. Simple current sensitive

C. None of these

D. Ballast

44. Hydrogen in liquid steels is dissolved_________________?
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A. In the molecular form

B. As tiny gas bubbles

C. In the atomic form

D. In the ionic form

45. The minimum carbon content in steel should be ____________________ percent for it to respond to a hardening treatment ?
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A. 0.4

B. 0.8

C. 0.6

D. 0.2

46. Cast iron contains ____________________ percent carbon?
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A. 2.5

B. 4.75

C. 3.75

D. 5.25

47. Unit of surface tension in S.I. unit is_________________?
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A. Watt/m

B. Newton/m2

C. Joule/m

D. Joule/m2

48. Wrought iron is not____________________?
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A. Having maximum tensile strength along the lines of slag distribution

B. Weldable easily

C. Having uniform strength in all directions

D. Ductile & resistant to corrosion/rusting

49. Machinability of hard alloys and tool steels is improved by_____________________?
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A. Normalising

B. Spheroidising

C. Tempering

D. Annealing

50. ______________ 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. Expansion

B. Bell and Spigot

C. Flanged

D. Collar

51. Midrex process of sponge iron production uses reformed natural gas as the reducing agent, which uses iron ore in the form of_________________?
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A. Briquettes

B. Lumps

C. Pellets

D. Sinter

52. Laser is a device to produce___________________?
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A. Microwaves

B. A beam of coherent light

C. A beam of white light

D. Gamma rays

53. Theoretical volume of oxygen required for complete combustion of 1Nm3 of acetylene, in oxy-acetylene welding is ______________ Nm3 ?
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A. 0.5

B. 1

C. 3-Jan

D. 2.5

54. 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. Only

B. Plus variable cost

C. Plus selling expenses

D. Plus overhead cost

55. Circular cross section machine parts which are symmetrical about the axis of rotation are made by hot_____________________?
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A. Spinning

B. Piercing

C. Drawing

D. Extrusion

56. The yield point phenomenon observed in annealed low carbon steel is due to the presence of the following element ?
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A. Chromium

B. Phosphorous

C. Carbon

D. Silicon

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

B. 5

C. 3

D. 1.5

58. Which of the following phenomenon will exhibit the minimum heat transfer ?
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A. Forced convection in air

B. Conduction in air

C. Boiling

D. Free convection in air

59. Limestone is added in the blast furnace (during pig iron manufacture) to______________________?
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A. Reduce the coke consumption

B. Reduce slag viscosity

C. Form slag by combining with impurities

D. Supply heat by undergoing exothermic reaction with impurities

60. _____________________ of grey cast iron produces white cast iron?
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A. Rapid heating

B. Rapid cooling

C. Slow cooling

D. Tempering

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