chemical engineering stoichiometry MCQs – Page 4

Practise multiple-choice questions from chemical engineering stoichiometry for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering stoichiometry Mcqs
61. The molecular velocity of a real gas is proportional to (where, T = absolute temperature of the gas)?
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A. T2

B. T

C. ?T

D. 1/?T

62. For water evaporating into unsaturated air under adiabatic conditions and at constant pressure, the ____________ remains constant throughout the period of vaporisation ?
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A. Humidity

B. Dry bulb temperature

C. Wet bulb temperature

D. Relative saturation

63. Faster rate of drying of moulded refractories results in high ______________ of refractories?
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A. Green strength

B. Voids

C. Shrinkage

D. Both B. and C.
64. Methane is mixed with stoichiometric proportion of oxygen and completely combusted. The number of additional specifications required to determine the product flow rate and composition is_______________?
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A. 0

B. 3

C. 2

D. 1

65. If the absolute temperature of an ideal gas is tripled and simultaneously the pressure is reduced to one third; then the volume of gas will _______________?
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A. Increase three fold

B. Increase nine fold

C. Remain unaltered

D. Decrease three fold

66. Which form of silica has the highest specific gravity ?
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A. Cristobalite

B. Tridymite

C. Quartz

D. All have the same specific gravity

67. A vapor whose partial pressure is less than its equilibrium vapor pressure is called the _____________ vapor?
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A. Saturated

B. Dry gaseous

C. Superheated

D. Unsaturated

68. The effect of pressure on the heat capacity of the gases ______________ is negligible?
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A. At pressure below one atmosphere

B. Below the critical temperature

C. Both A. & B.

D. Neither A. nor B.

69. For a given mass of a gas at constant temperature, if the volume V becomes three times, then the pressure P will become______________?
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A. 9P2

B. P/3

C. 3P

D. 9P

70. Addition of zircon to silica refractory brick improves its_________________?
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A. Crushing strength

B. Resistance to slag attack

C. Both A. and B.

D. Neither A. nor B.

71. Which of the following is the Clausius-Clapeyron Equation ?
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A. p = [RT/(V b)] (a/TV2)

B. (P + a/V2)(V-b) = RT

C. PV = RT + B/V + y/V2 + .

D. loge (p/p0) = (?/R) (1/T0 1/T)
72. Raoults law states that the equilibrium vapor pressure that is exerted by a component in a solution is proportional to the mole fraction of that component. This generalisation is based on the assumption that the________________?
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A. Component molecules are non-polar and no chemical combination or molecular association

B. Attractive forces between like and unlike molecules are approximately equal

C. Sizes of the component molecules are approximately equal

D. ween unlike molecules takes place in the formation of the solution

E. All A., B. & C.
73. In case of a ternary system involving two liquid components and a solute, the ratio of the concentration of the solute in the two phases at equilibrium is called the distribution co-efficient. The distribution co-efficient depends upon the______________?
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A. Solute concentration

B. Temperature

C. Both A. & B.

D. Neither A. nor B.

74. Viscosity of 1 centipoise is equal to 1 Centistoke in case of________________?
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A. None of these

B. Mercury

C. Water

D. Carbon tetrachloride

75. In a binary liquid solution of components A? and B?, if component A? exhibits positive deviation from Raoults law, then component B? ?
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A. Obeys Raoults law

B. Exhibits positive deviation from Raoults law

C. May exhibit either positive or negative deviation from Raoults law

D. Exhibits negative deviation from Raoults law

76. Weight of 56 litres of ammonia at N.T.P. is _____________ gm?
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A. 42.5

B. 2.5

C. 2800

D. 56

77. Which is not an acidic refractory ?
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A. Carbon black

B. Fireclay

C. High alumina refractory

D. Silica

78. Pick out the wrong unit conversion of heat transfer co-efficient?
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A. 1 BTU/ft2.hr.F = 4.88 kcal/m2.hr.C = 20.44 kJ/m2.hrC = 5.678 W/m2.C

B. 1 kcal/m2.hr.K = 1.163 W/m2.C

C. 1 W/m2.C = 0.1761 BTU/ft2.hr.F.

D. 1 kcal/m2.hr.C = 0.2048 BTU/ft2.hr. F. = 1.163 W/m2.K

79. Avogadros number is equal to__________________?
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A. 6.023 1026 molecules/gm.mole

B. 6.023 1023 molecules/gm.mole

C. 6.023 1016 molecules/kg.mole

D. 6.023 1023 molecules/kg.mole

80. The unit of Cp in S.I. units is___________________?
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A. J/kg.K

B. W/m2.K

C. J/m3. K

D. W/m.K