chemical engineering MCQs – Page 252

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 Review each marked answer and report any item that may be outdated or unclear.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

5021. Which of the following isotopes is not present in natural uranium?
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A. U-232

B. U-234

C. U-235

D. U-238

5022. Which of the following is the most important rubber compounding ingredient which is used to improve wearing qualities of both natural rubber & SBR by imparting toughness ?
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A. Pine oil

B. Phosphorous

C. Rosin

D. Carbon black

5023. Pick out the correct statement ?
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A. een, is called Work index

B. Kicks crushing law is, P/m = K . ln (D? sa/D? sb)

C. Energy required in kwh per ton of product, such that 80% of it passes through a 200 mesh

D. Plastic chips are called non-cohesive solids

E. Communition is a generic term for size enlargement operation

5024. 90% of the caprolactam is converted to nylon-6 on its condensation polymerisation in the reactor maintained at a temperature of _____________ C?
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A. 500-600

B. 30-Oct

C. -5

D. 250-280

5025. The ratio of neutrons to protons of an element having a mass number and atomic number of 80 and 40 respectively is ___________________?
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A. 0.5

B. 1

C. 4

D. 2

5026. The amount of a radioisotope remaining undecayed after a time equal to four times its half life, will be _____________ percent?
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A. 3.125

B. 25

C. 12.5

D. 6.25

5027. Light water used as a coolant in nuclear reactor is nothing but______________________?
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A. Mildly acidic (pH = 6) water

B. None of these

C. Ordinary water

D. Mildly alkaline (pH = 8) water

5028. Nuclear fuel complex, Hyderabad is engaged in the job of ___________________?
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A. Processing of uranium ore

B. Treatment of spent fuel

C. Manufacture of nuclear fuel elements/assemblies

D. None of these

5029. SBR is produced by the copolymerisation of butadiene & styrene by employing emulsion polymerisation. The weight ratio of styrene and butadiene is maintained at_________________?
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A. 2:01

B. 3:01

C. 1: 3

D. 1:02

5030. The size of an atom is of the order of one __________________?
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A. Fermi

B. mm

C. Micron

D. Angstrom

5031. Pick out the wrong statement?
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A. Deuterium atom has one proton and two neutrons in its nucleus

B. Cadmium is capable of absorbing neutrons

C. Electrons have negligible mass and unit negative change

D. The disintegration rate of a radioactive substance cannot be increased by heating it

5032. Out of all the elastomers, natural rubber has the longest elongation range & flexibility of the order of _______________ percent?
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A. 1-1000

B. 1500-2000

C. 1000-1500

D. 2000-2500

5033. Pick out the wrong statement?
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A. When the reaction rate is independent of temperature, the reaction is said to be of zero order

B. The integral method of analysing kinetic data is used when the data is scattered

C. The ratio of volumes of plug flow reactor to that of mixed reactor is always less than one for identical feed composition, flow rate, conversion and for all positive reaction orders

D. The differential method of analysing kinetic data requires more accurate or larger amounts of data

5034. Pick out the wrong statement ?
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A. Rate of decomposition of olefins in catalytic cracking is slightly slower than the thermal cracking

B. Catalytic cracking is endothermic, but the regeneration of catalyst is exothermic

C. None of these

D. Iso-paraffin crack faster than n-paraffin.

5035. Bakelite is a/an ______________________?
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A. Addition polymer

B. None of these

C. Elastomer

D. Thermoplastic

5036. Which of the following is a moderating material used in nuclear reactor ?
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