chemical engineering chemical engineering basics mcqs to prepare for nts, kppsc, fpsc, ppsc and more

chemical engineering chemical engineering basics Mcqs

51. Midrex process of sponge iron production uses reformed natural gas as the reducing agent, which uses iron ore in the form of_________________?
0

A. Briquettes

B. Lumps

C. Pellets

D. Sinter

52. Laser is a device to produce___________________?
0

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 ?
0

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________________?
0

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_____________________?
0

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 ?
0

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 ?
0

A. 7

B. 5

C. 3

D. 1.5

58. Which of the following phenomenon will exhibit the minimum heat transfer ?
0

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______________________?
0

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?
0

A. Rapid heating

B. Rapid cooling

C. Slow cooling

D. Tempering

61. Powder metallurgy technique is used in the production of ____________________ tools ?
0

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 ?
0

A. 50

B. 10

C. 30

D. 80

63. Ferromagnetic materials owe their properties to __________________ inner sub-shells ?
0

A. Partially filled

B. Equally filled

C. Vacant

D. Completely filled

64. Which of the following is not categorised as the ore agglomeration process ?
0

A. Nodulising

B. Balling

C. Pelletising

D. Briquetting

65. Water-tube boiler is the one, in which _____________________?
0

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_____________________?
0

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 ?
0

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__________________?
0

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 _______________________?
0

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 _____________________?
0

A. -58

B. -33

C. -55

D. -40

71. Vernier calipers cannot be used to measure the______________________?
0

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 ?
0

A. Acidity

B. Viscosity

C. Basicity

D. Fluidity

73. Which of the following materials has the least scrap value ?
0

A. Copper

B. Aluminium

C. Brass

D. Stainless steel

74. Which of the following metals cannot be hot worked at room temperature ?
0

A. Zinc

B. Nickel

C. Lead

D. Tin

75. Materials having ________________ lattice structure are usually the most ductile ?
0

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___________________?
0

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_____________________?
0

A. 1.8

B. 1

C. 0.8

D. 1.4

78. Matte smelting is used in the extraction of_____________________?
0

A. Zinc

B. Aluminium

C. Copper

D. Lead

79. Rain drops falling through atmospheric air attain limited terminal velocity, because of ____________________?
0

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______________________?
0

A. 3-Jan

B. 0

C. 2-Jan

D. 1

81. Steel is welded using the ________________ flame ?
0

A. Oxidising

B. Carburising

C. All A, B. & C

D. Neutral

82. The lightest non-inflammable gas is_________________?
0

A. H2

B. He

C. Ar

D. O2

83. With increase in annealing temperature, the following defect density decreases?
0

A. Vacancy

B. All of these

C. Dislocation

D. Grain boundary

84. Biological shield in a nuclear reactor is generally provided to protect against the__________________?
0

A. Electrons

B. Gamma rays & neutrons

C. ?-rays

D. ?-rays

85. _______________ test determines the yield strength, Youngs modulus of elasticity, percentage reduction in area & percentage elongation of a material ?
0

A. Fatigue

B. Impact

C. None of these

D. Tensile

86. Which of the following varies as the square root of oil pressure during atomisation of fuel oil through a pressure jet burner ?
0

A. Output & fineness

B. Velocity

C. Both A. & B.

D. None of these

87. With increase in compression ratio, the volumetric efficiency of air compressor____________________?
0

A. May increase or decrease (depends on the suction pressure)

B. Remain same

C. Increases

D. Decreases

88. The most detrimental impurity in high pressure boiler feed water is ___________________?
0

A. Suspended salt

B. Turbidity

C. Dissolved salt

D. Silica

89. Maximum hardenability of steel depends upon its_______________________?
0

A. Alloying elements content

B. Chemical composition

C. Grain size

D. Carbon content

90. Heating of ferromagnetic materials to a temperature above Curie temperature makes it ________________________?
0

A. Superconductor

B. Ferritic

C. Insulator for heat & electricity transmission

D. Behave like paramagnetic materials

91. The dimensional formula of bulk modulus of elasticity is same as that of the ____________________?
0

A. Force

B. Pressure

C. Density

D. None of these

92. Stresses encountered in the metal forming processes are less than the _____________ of the material?
0

A. Limit of proportionality

B. Fracture strength

C. Yield strength

D. Elastic limit

93. Large diameter reinforced cement concrete (RCC) pipes are generally joined by ____________________ joint ?
0

A. Flanged iron

B. Collar

C. Flexible

D. Expansion

94. Which of the following is a commonly used manometric liquid for low pressure range ?
0

A. Ethylene glycol

B. Carbon tetrachloride

C. Glycerol

D. Ethyl alcohol

95. Carbide tipped cutting tools are manufactured by powder metallurgy techniques and have a composition of_____________________?
0

A. 90% tungsten carbide and 10% cobalt

B. 30% nickel, 15% chromium & 55% tungsten

C. 65% tungsten & 35% zirconium

D. 70% aluminium oxide & 30% silica

96. ________________ is a special constituent of chlorophyll without which photosynthesis is not possible ?
0

A. Hydrogen

B. Phosphorous

C. Nitrogen

D. Calcium

97. The rolling process cannot be used to produce______________________?
0

A. Rods

B. Plates

C. Tubes

D. Wires

98. The softness or hardness of a grinding wheel depends upon the type & amount of bonding material used. For general purpose cutter grinding _______________ grinding wheel is normally used ?
0

A. Aluminium oxide

B. Hard

C. Silicon carbide

D. Soft

99. In multipass welds, shot peening is done after each pass to__________________?
0

A. Close the surface porosity

B. Break the continuity of columnar grains

C. Introduce texture in the weld

D. Flatten the weldment

100. A common disinfectant used in village wells for disinfection of water is __________________?
0

A. Iodine

B. Bromine

C. Potassium permanganate

D. Free chlorine

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