Senior Chemical Engineer

Senior Chemical Engineer Interview Questions and Answers

Updated 17 Feb 2023

Q1. 3. Between Kerosene and water what will you observe while using the same pump

Ans.

The pump will observe both kerosene and water being pumped together.

  • The pump will not be able to differentiate between the two liquids

  • Both liquids will be pumped together in the same flow

  • The mixture of kerosene and water may cause issues in downstream processes

  • Separation techniques such as gravity settling or centrifugation may be required to separate the two liquids

Q2. 5. If you have to enhance flow by twice what and all to considered during pipe sizing

Ans.

To enhance flow by twice, pipe diameter needs to be increased by factor of 1.19 and velocity needs to be reduced by half.

  • Increase pipe diameter by factor of 1.19

  • Reduce velocity by half

  • Consider the fluid properties and pressure drop

  • Ensure the pipe material can handle the increased flow

  • Check for any potential blockages or obstructions in the pipeline

Q3. 6. If distillation column pressure goes slightly up and there is no flooding will the seperation prove

Ans.

Slight increase in distillation column pressure without flooding will not affect separation

  • Slight increase in pressure does not cause flooding which is the main factor affecting separation

  • Separation efficiency may decrease slightly but not significantly

  • Factors like temperature, feed rate, and composition also affect separation

Q4. 4. Between H2 and N2 say for 100 kg/hr more pressure drop will be observed

Ans.

H2 will have more pressure drop than N2 for 100 kg/hr

  • H2 has a smaller molecular size than N2

  • Higher flow rate leads to higher pressure drop

  • This phenomenon is commonly observed in gas pipelines

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Q5. 2. How to calculate the line size

Ans.

Line size calculation depends on flow rate, fluid properties, and pressure drop.

  • Determine the required flow rate

  • Determine the fluid properties such as viscosity and density

  • Calculate the pressure drop based on the length of the line and the fittings used

  • Select a line size that can handle the required flow rate with an acceptable pressure drop

  • Consider factors such as cost and space limitations

  • Use industry standards and guidelines for reference

  • Perform simulations and testing if ...read more

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