Interview Questions

General Chemical engineering
  1. State Raoult's Law, Henry's law, Dalton's law?
  2. What is Antoines law / How is vapor pressure related to temperature ? Write down the Expression ?
Pumps
  1. What is a pump? Draw the characteristic curve of the centrifugal pump?
  2. Classification & uses of different types of pump?
  3. How many types of pumps do you know / have heard of ? Do you know where are they applied in real life ?
  4. What is centrifugal pump?
  5. What are Affinity laws ?
  6. There is a pump of 100 m3 & head of 10m, similar pump of same discharge & head is on standby, what will happen to discharge if both the pumps are started together? Increase or Decrease ?
  7. Different types of losses in pump?
  8. Area of Rotameter from bottom to top ? Increases, Decreases, remains constant?
  9. When is Bernoulli equation not applicable ?
  10. Why is discharge line size usually one size smaller compared to suction line ? 
  11. Can the discharge line size be equal to or greater than suction line size ?
  12. Why is velocity in suction line preferred to be low ?
  13. There are 3 liquids, Viscosity of 3 > Viscosity of 2 > Viscosity of 1 (given). What will be the relation between the power consumption of this 3 Liquids.? 
NPSH
  1. What is NPSH ? Why do we need to calculate NPSH ? 
  2. What is NPSHa & NPSHr ?
  3. NPSHa should be greater than, less than, equal to NPSHr ? 
  4. Can NPSHa be negative ?
  5. What steps would you take to increase NPSHA ?  
  6. Your pump is designed to pump water, now you have chocoloate to pump. What will be the effect on head ? on NPSHA ? on Power ? 
Heat Transfer
  1. Explain Heat Exchanger Fouling, Correction Factor?
  2. Different types of re-boiler other than kettle?
  3. Different types of Shell & Tube Heat exchanger ?
  4. LMTD & its significance ?
Mass Transfer

  1. What is relative volatility?
  2. What happens if vapor velocity is low in distillation column?
  3. Minimum temperature upto which water can be cooled in cooling tower?
    Process Control & Instruments
    1. Which  controller is used for temperature measurement ? remember temperature measurement is a sluggish process ? P, PI, PID or none of these
    Petroleum
    1. For same octane number which of the following has higher octane number? Paraffin,  Olefins, Aromatics, all have same.
    2. Hydrocracking takes place at ? Low temp-Low pressure, High temp. High pressure, Low T high P, High T Low P.




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