chemical engineering chemical engineering basics MCQs – Page 4

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 Review each marked answer and report any item that may be outdated or unclear.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

61. Powder metallurgy technique is used in the production of ____________________ tools ?
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A. High carbon steel

B. Tungsten carbide

C. Drilling

D. High speed steel

62. A high pressure boiler generates steam at a pressure greater than _____________________ kg/cm2 ?
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A. 50

B. 10

C. 30

D. 80

63. Ferromagnetic materials owe their properties to __________________ inner sub-shells ?
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A. Partially filled

B. Equally filled

C. Vacant

D. Completely filled

64. Which of the following is not categorised as the ore agglomeration process ?
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A. Nodulising

B. Balling

C. Pelletising

D. Briquetting

65. Water-tube boiler is the one, in which _____________________?
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A. Tubes are placed in vertical position

B. Water passes through tubes and flue gases around it

C. None of these

D. wer: Option A

E. Tube carrying hot flue gases are immersed in a pool of water

66. Sudden fall of atmospheric pressure by a large amount is an indication of the_____________________?
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A. Storm

B. Fair weather

C. Cold wave

D. Rain

67. Transition from laminar to turbulent zone in free convection heat transfer is governed by the critical value of ?
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A. Grashoff number

B. Grashoff number & Prandtl number

C. Grashoff number & Reynolds number

D. Reynolds number

68. For infinite parallel planes having emissivities ?1 & ?2, the interchange factor for radiation from surface 1 to surface 2 is given by__________________?
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A. (?1 + ?2)/?1.?2

B. ?1.?2/(?1 + ?2 ?1.?2)

C. ?1.?2

D. ?1 + ?2

69. 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. Blast of air

B. Mixture of water and air

C. Rain of molten lead

D. Jet of water at high pressure

70. Fahrenheit and Centigrade scales have the same readings at _____________________?
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A. -58

B. -33

C. -55

D. -40

71. Vernier calipers cannot be used to measure the______________________?
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A. I.D. & O.D. of the shaft

B. Depth of holes

C. Thickness of parts

D. Clearance between two mating surfaces

72. The function of neutral flux used in the pyrometallurgy of metal extraction is to increase the _____________ of the slag ?
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A. Acidity

B. Viscosity

C. Basicity

D. Fluidity

73. Which of the following materials has the least scrap value ?
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A. Copper

B. Aluminium

C. Brass

D. Stainless steel

74. Which of the following metals cannot be hot worked at room temperature ?
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A. Zinc

B. Nickel

C. Lead

D. Tin

75. Materials having ________________ lattice structure are usually the most ductile ?
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A. Face centred cubic (fcc)

B. None of these

C. Hexagonal close packed (hcp)

D. Body centred cubic (bcc)

76. The leaching solvent used in Baeyers process for the purification of bauxite is___________________?
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A. Sodium hydroxide

B. Sodium carbonate

C. Ammonium carbonate

D. Ammonium hydroxide

77. The value of y = cp/cv. at < 500C for air & most common gases can be safely assumed to be_____________________?
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A. 1.8

B. 1

C. 0.8

D. 1.4

78. Matte smelting is used in the extraction of_____________________?
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A. Zinc

B. Aluminium

C. Copper

D. Lead

79. Rain drops falling through atmospheric air attain limited terminal velocity, because of ____________________?
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A. Viscous force exerted by air

B. Upward thrust due to air

C. Surface tension effects of water

D. Force of gravity

80. The ratio of the shear stress to the principal stress on a principal plane is______________________?
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A. 3-Jan

B. 0

C. 2-Jan

D. 1

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