Pressure maintained in the high pressure primary tower of a three stage crude oil distillation system is about ______________ kg/cm2?

Related Mcqs:

1. Vacuum maintained in the vacuum distillation tower of the crude distillation plant is about _______________ mm Hg (absolute)?

   A. 5-10
   B. 30-80
   C. 150-250
   D. 350-400

2. The pressure (kg/cm2) and temperature (°C) maintained in electrical desalters for crude oil are respectively__________________?

   A. 10 and 120
   B. 1 and 200
   C. 50 and 250
   D. 10 and 300

3. During electrical desalting of crude oil, the electrical conductivity of a mixture of crude oil and water (which ranges between 3 to 8% water) ________________ with increase in the amount of water?

   A. Decreases
   B. Increases
   C. Remains unchanged
   D. Decreases linearly

4. Crude oil is subjected to vacuum distillation in the last stage, because_________________?

   A. High boiling point products like heavy fuel oil & lubricating oils are heat sensitive and may
   decompose
   B. Lighter/low boiling products are prone to thermal decomposition
   C. High purity products can be obtained thereby
   D. None of these

5. Bottom product of atmospheric pressure crude oil distillation column is termed as________________?

   A. Reduced crude
   B. Heavy ends
   C. Asphalt
   D. Residuum

6. Though increased pressure has a retarding effect on cracking reaction, yet in actual process, a positive pressure of 10-15 kgf/cm2 is maintained during cracking mainly to__________________?

   A. Increase the yield of light distillates
   B. Suppress coke formation
   C. Enhance the octane number of gasoline
   D. Reduce gum content in gasoline

7. The vacuum maintained in vacuum distillation unit for reduced crude is about _______________ mm Hg?

   A. 1.2
   B. 12
   C. 120
   D. 700

8. Paraffin base crude oil as compared to asphalt base crude gives___________________?

   A. Higher yield of straight run gasoline
   B. Higher octane number gasoline
   C. Lower viscosity index lube oil
   D. Poorer yield of lube oil

9. _____________ base crude oil is also called asphaltic crude?

   A. Paraffinic
   B. Naphthenic
   C. Mixed
   D. Aromatic

10. Water content in the crude oil as it comes out of oil well may be upto ______________ percent?

    A. 2
    B. 5
    C. 10
    D. 25