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Technical Interview Questions - 6 contains interview questions about  inert gases used in industry, Corrosion and erosion in piping, Saponification, aromatic and aliphatic hydrocarbons, Multiple effect evaporator, single effect, multiple effect evaporator, industrial dryers,

61. What are inert gases? Why they are inert? Give the names of 4 inert gases.
62. Define : Corrosion and erosion
63. Define : Saponification
64. Give difference between aromatic and aliphatic hydrocarbons.
65. Write difference between Forward feed and Backwa

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61. What are inert gases? Why they are inert? Give the names of 4 inert gases.

  • An inert gas is a gas which does not undergo chemical reactions under a set of given conditions.
  • Inert gases are generally used to avoid unwanted chemical reactions degrading the sample. These undesirable chemical reactions are often oxidation & hydrolysis with oxygen and moisture in air.
  • Examples
    1. Purified ARGON
    2. NITROGEN 
    3. NEON
    4. HELIUM
    5. CO2.

62. Define : Corrosion and erosion

Corrosion
It is natural process in  which  degraded the  useful  property of material  such as strength, structure. It occurs in metal but sometimes in polymer.

Corrosion in pipe


Erosion
It is action of surface process that removes soil, rocks or dissolves  material from the one location to another.

Erosion


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63. Define : Saponification

When an oil or fat is boiled with a solution of caustic  soda, the resultant product are soap and glycerin. The chemical reaction is called saponification.

Oil + NaOH -------- > Soap + Glycerin

64. Give difference between aromatic and aliphatic hydrocarbons.

Aromatic Compound
Aliphatic Compound
They are containing aromatic ring or benzene ring.
They are organic chemical compound without benzene ring.
They are always cyclic.
They are linear and cyclic.
They are always unsaturated.
They are saturated and unsaturated.
They are conjugated due to the presence of alternating double bond.
The majority of aliphatic compound are not conjugated.


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65. Write difference between Forward feed and Backward feed evaporation.


Forward Feed Evaporator
Backward Feed evaporator

Forward feed evaporation


Flow of solution and steam is in parallel direction.

Backward feed evaporation


-Flow of solution and steam is in counter current direction.
-It’s not required pump.

-In this process heating of feed in each effect.
-Maintenance cost and power cost is less.
-Maintenance charge and power cost is high.
-Get less thick liquor.



66. Write difference between single effect and multiple effect evaporator.


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