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Technical Interview Questions - 5 contains interview questions about corrosion inhibitor in chemical industry , elementary reaction,  non-elementary reaction, leaf filter, plate filter, Manometer, Water softening

51. What is shear stress and shear strain?
52. What is corrosion inhibitor?
53. What is difference between mild steel and stainless steel?
54. Define Exothermic & Endothermic reaction.
55. How hard water can be softened?
56. What is cloud point & pure point?
57. Define elementary reaction & non-elementary reaction.
58. Define leaf filter and  plate filter.
59. Name any four type of pipe fitting & it’s application.

60. What is the function of Manometer?

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51. What is shear stress and shear strain?

Shear stress
shear stress is stress (external force) acting on an object or surface parallel to the slope or plane.
τ = F/A
F= force applied       
A= cross sectional area of material
Shear strain: - 

Deformation of solid due to stress.
ε = di/Io
di = change  of length        
Io = initial length

52. What is corrosion inhibitor?

A substance that decreases the rate of metal oxidation called inhibitor.

corrosion inhibitor


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53. What is difference between mild steel and stainless steel?

The most basic difference between mild steel and stain less steel is in their composition.
  • Mild Steel is made from a combination iron and carbon. It is most suitable in the construction industry and for making heavy equipment.
  • Stainless steel made from a combination of chromium and iron. The resulting metal is noncorrosive and resistant to rusting.
mild steel and stainless steel


54. Define Exothermic & Endothermic reaction.
  • Exothermic reaction: - a reaction which release the heat energy.
  • Endothermic reaction: - a reaction which absorb the heat energy.
55. How hard water can be softened?
  • by zeolite process
  • ion exchanger requires
  • lime softening
  • reverse osmosis
  • on boiling


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56. What is cloud point & pure point?

Cloud point
Cloud point refers to the temperature below which wax in diesel or biowax in biodiesels form a cloudy appearance.

Pour point
The pour point of a liquid is the temperature at which it becomes semi solid and loses its flow characteristics.

57. Define elementary reaction & non-elementary reaction.

Elementary reaction
It is chemical reaction in which one or more chemical species react directly to form of products in single step & with single transition state.


Non-elementary reaction
A reaction  that  can be broken down  into  a number  of steps. the rate of reaction will be determined only by the reactants involved in the slowest steps.


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58. Define leaf filter and  plate filter.

Leaf filter
leaf filter

  • These  filters provide large  surface  area by using varieties of filter leaves and do not require complete disassembly for cleaning  that  is  necessary  with  plate  end  frame filter press.
  • The filter leaf in general consist of a heavy wire drainage screen mounted in  a tubular frame which acts as support and filtrate  conduit.  The  slurry  to be filtered  fills  the space around the leaf  by applying  pressure  on the  slurry  or vacuum  within  the  leaf.
  • In either case  the  filter  cake builds  upon  the  outside  of leaf  and  filtrate  passes from  within the leaf to the filtrate discharge system.
Plate filter

Plate filter

  • Slurry to be filtered is pumped through  the  feed  channel.  If runs  into  the chamber and fills the chamber completely the pressure goes on increase.
  • The solid are deposited  on the  filter  cloth.  The  two  cake is  formed  simultaneously  in  chamber.
  • The press is  then dismantled  and  the cake of solid  scrapped off from  each plate  and dropped to a conveyor or strange bin.
  • Than it is washing simply and discharge the filtrate.
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59. Name any four type of pipe fitting & it’s application.

Name of pipe fitting
Application
Valve


to regulate flow



Elbow

to change the direction of flow

Elbow


Tee & cross
to combine or divide fluid flow




Plugs
to terminating flow




Nipple
to join two tubes



Reducers
to change the diameter of pipe (to reduce the diameter of Pipe)

Reducers



60. What is the function of Manometer?

Manometers are simplest pressure measuring device. They are used for measuring Low Pressure or Pressure Difference.

function of Manometer

Thanks for reading - Technical Interview Questions - 5
Naitik Patel
Industrial Guide

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