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Technical Interview Questions - 11 contains interview questions about chemical reaction,  exothermic reaction,  Endothermic reaction, What is DPK,  paraffin,  iso paraffins, straight chain paraffins, Naphthenic hydrocarbons,  olefins.

111. What is a chemical reaction?
112. What is exothermic reaction? What is Endothermic reaction?
113. What is DPK? Where Return kerosene is used?
114. What is paraffin?
115. What are iso paraffins?
116. Why kerosene selected for Normal Paraffin production?
117. What are the characteristics of straight chain paraffins?
118. What changes in properties occur when paraffin are isomerizes?
119. What are the properties of Naphthenic hydrocarbons?
120. What are the properties of olefins?

111. What is a chemical reaction?

It is a chemical change in which elements combine to form compounds or breaking out compounds to recombine to form new compounds.

112. What is exothermic reaction? What is Endothermic reaction?

A chemical reaction in which heat is liberated is called exothermic reaction

Example: union fining reaction

A chemical reaction in which heat is absorbed is call endothermic reaction

Example: pacol reaction

113. What is DPK? Where Return kerosene is used?

DPK: Duel purpose kerosene. Return kerosene used as Jet A, B, JP & JPB)

114. What is paraffin?

Carbon atoms connected in a straight chain by single bond (normal) Butane C-C-C-C

115. What are iso paraffins?

Carbon atoms having branched chain, single bond arrangement is called Iso-parafins (non-normals).

Iso-butane C- C - C

|

C

116. Why kerosene selected for Normal Paraffin production?

Normal paraffin is rich in kerosene carbon range, almost about 18.5% with C10-13 range. Average Molecular Weight of heart cut is about 165.

117. What are the characteristics of straight chain paraffins?

  • Saturated compounds with a general formula CnH2n+2 Good natural stability. 
  • Natural high Viscosity Index (V.I) lubricating oils. 
  • Good source of waxes.
  • Poor for manufacture of Gasoline.
  • Hard carbon deposits.
  • High pour point
  • Found particularly in paraffin crude.

118. What changes in properties occur when paraffin are isomerizes?

  • Boiling point is lowered.
  • Octane number is increased.

119. What are the properties of Naphthenic hydrocarbons?

  • They are cyclo paraffin
  • They are saturated with a genera formula CnH2n+2
  • Low VI
  • Low pour point
  • Better octane rating than corresponding paraffin.
  • Naphthenic Motor oils form sort, fluffy carbon deposits.

120. What are the properties of olefins?

  • They are unsaturated.
  • Readily react with oxygen to form sludge.
  • Possess good anti-knock properties.

Thanks for reading - Technical Interview Questions - 11
Naitik Patel
Industrial Guide

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