chemical engineering MCQs – Page 255

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 Review each marked answer and report any item that may be outdated or unclear.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
5081. Which of the following is a non-fissile material ?
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A. Thorium-232

B. Uranium-235

C. Uranium-233

D. Plutonium-239

5082. Energy equivalent to one atomic mass unit (amu) is ______________ MeV?
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A. 9.31

B. 93.1

C. 9310

D. 931
5083. Viscosity of a polymer solution or melt _________________?
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A. Decreases with increase in temperature

B. Does not vary with temperature rise

C. Decreases with increase in molecular weight

D. Increases with increase in temperature
5084. Which is the most commonly used molten metal for cooling of nuclear reactors ?
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A. Calcium

B. Sodium

C. Mercury

D. Zinc

5085. Polypropylene compared to polythene is___________________?
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A. Harder

B. Stronger

C. All A., B. and C.

D. Lighter

5086. Pick out the wrong unit conversion of calorific value?
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A. 1 kcal/kg = 1.8 BTU/lb = 4.186 kJ/kg

B. 1 BTU/ft3 = 8.9 kcal/m3 = 0.038 MJ/m3

C. 1 BTU/lb = 2.3 kcal/kg

D. 1 kcal/m3 = 0.1124 BTU/ft3

5087. Epoxy resin is a polymer containing two or more groups of the bellow fig. is called epoxide group or ethoxyline group. It is a _______________?
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A. Polyamide & an elastomer

B. Good adhesive

C. Surface coating agent

D. Both B. and C.
5088. The mass number of an element is equal to the number of _____________ in the nucleus?
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A. Electrons

B. Neutrons plus protons (i.e., nucleons)

C. Protons

D. Neutrons

5089. Energy produced in the nuclear fission is of the order of _____________ MeV?
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A. 1000

B. 20

C. 200

D. 2000

5090. The main use of butadiene is____________________?
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A. As an anti-skimming agent in paint

B. As a plasticiser for unsaturated polyester

C. None of these

D. In the manufacture of synthetic rubber
5091. Neoprene is chemically known as _________________?
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A. Polyurethane

B. Poly chloroprene

C. Polybutadiene

D. Styrene butadiene rubber (SBR)

5092. Due to its excellent permeability to air/gas and oxidation resistance, the tubes of automobile tyres is made of________________?
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A. Cold SBR

B. Butyl rubber

C. Buna S

D. Bunai N

5093. Pick out the wrong statement?
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A. The equipment used for the removal of traces of solids from a liquid is called a classifier

B. Cod oil, beef tallow or aluminium stearates are used as grinding aids in cement industries

C. Size enlargement is a mechanical operation exemplified by medicinal tablet making

D. Close circuit grinding is more economical than open circuit grinding

5094. Which of the following is an inorganic polymer ?
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A. Teflon

B. Bakelite

C. Silicones

D. Perspex

5095. The critical mass of a fissionable material can be reduced by__________________?
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A. Surrounding it by neutron reflecting material

B. Surrounding it by neutron absorbing material

C. Cooling it

D. Heating it

5096. Addition polymerisation takes place either by a free radical mechanism or ionic mechanism depending on the reagents used. Free radical polymerisation is catalyzed by _______________, which decompose to give free radicals?
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A. Hydrofluoric acid

B. Organic peroxides

C. Sulphuric acid

D. None of these

5097. Enrichment of uranium is done to increase the concentration of ______________ in the natural uranium?
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A. U-233

B. Pu-239

C. U-238

D. U-235
5098. Glyptal used in the manufacture of paints & lacquers is a _____________ polymer?
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A. Polystyrene

B. Polyamide

C. Polyester

D. Polyacrylonitrile

5099. Pick out the wrong statement?
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A. Clausius-Clapeyron equation relates the latent heat of vaporisation to the slope of the vapor pressure curve

B. Percentage saturation and relative saturation are numerically equal for an unsaturated vapor gas mixture

C. Clapeyron equation is given by dP/dT = (?/T) (VG VL); where, P = vapor pressure, T = absolute temperature, ? = latent heat of vaporisation, VG and VL = volumes of gas and liquid respectively

D. At the boiling point of liquid at the prevailing total pressure, saturated absolute humidity is infinite

5100. Which of the following types of polymers has the strongest inter particle forces ?
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A. Thermoplastics

B. Thermosetting polymers

C. Elastomers

D. Fibres