chemical engineering MCQs – Page 253

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 Review each marked answer and report any item that may be outdated or unclear.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

5041. Branched chair polymers as compared to linear polymers have _________________?
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A. Lower density

B. None of these

C. Higher tensile strength

D. Higher melting point

5042. In a cross linked polymer, the monomeric units are linked together to constitute a three dimensional network. Which of the following is a cross-linked polymer ?
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A. Polythene

B. Nylon-6

C. Bakelite (phenol formaldehyde)

D. Polyester

5043. Radioactive decay is a _____________ change?
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A. None of these

B. Nuclear

C. Physical

D. Chemical

5044. Pick out the correct statement pertaining to catalytic cracking ?
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A. All A., B. and C.

B. With increase in the reactor temperature, gasoline yield decreases for a given conversion

C. With increase in the reactor pressure, octane number of gasoline decreases

D. Percentage conversion increases with increase in the catalyst to oil ratio

5045. Molecular weights of plastics ranges from_______________?
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A. 5000 to 1000

B. 20000 to 25000

C. 109 to 1011

D. 1000 to 5000

5046. Tyres are made by___________________?
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A. Compression moulding

B. Rotational moulding

C. Injection moulding

D. Extrusion

5047. Select the correct statement from the following?
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A. The amplitude ratio of a pure capacity process is inversely proportional to frequency

B. The frequency response of a pure capacity process is unbounded

C. The phase lag of a pure time delay system decreases with increasing frequency

D. The amplitude ratio of a pure time delay system increases with frequency

5048. Buna-S is also known as_________________?
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A. Teflon

B. PTFE

C. SBR

D. Polycrylates

5049. Flexible plastic pipes are made of___________________?
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A. High density polyethylene (HDPE)

B. Low density polyethylene (LDPE)

C. Unsaturated polyester

D. Polypropylene

5050. Teflon is__________________?
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A. Polytetrafluroethylene (PTFE)

B. An inorganic polymer

C. Phenol formaldehyde

D. A monomer

5051. Pick out the wrong statement regarding the solubility characteristics of high polymers?
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A. High molecular weight polymers on dissolving gives solution of very low viscosity

B. Greater the degree of cross-linking in the polymer, lesser is its solubility

C. Swelling tendency or solubility of polymers in a particular solvent decreases with increase in molecular weight of the solvent

D. Polymers having more aliphatic character are more soluble in aliphatic solvents, while those polymers having more aromatic character are more soluble in aromatic solvents

5052. Pick out the wrong statement ?
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A. Fluorescence of oils helps to detect its adulteration

B. A pale color of petroleum product indicates lower viscosity

C. Lighter petroleum distillates are lighter in color than the heavier residual oils

D. Color of petroleum products indicates the degree of refinement

5053. Uranium is recovered from its ore (pitchblende) by________________?
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A. Dissolving in water

B. Froth floatation technique

C. Smelting in a furnace

D. Leaching with sulphuric acid

5054. Molten sodium (as a coolant in fast breeder reactor) ?
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A. Is highly radioactive at elevated temperatures and can cause explosion, when it comes in