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

Related Mcqs:

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

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

2. Vacuum maintained in the vacuum distillation column in oil refinery is in the range of about ________________ mm Hg absolute?

   A. 1 to 5
   B. 30 to 80
   C. 250 to 350
   D. 450 to 500

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

   A. 1.5
   B. 3
   C. 6
   D. 12

4. The terminology used for the bottom most product from the vacuum crude distillation unit is______________?

   A. Residual crude
   B. Residuum
   C. Reduced crude
   D. Petrolatum

5. Catalytic cracking compared to thermal cracking of residue of vacuum distillation of crude oil__________________?

   A. Gives higher yield of petrol
   B. Lower octane number of petrol
   C. Higher sulphur content in the product
   D. Higher gum forming material in petrol

6. 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

7. Naphtha yield in straight run distillation of crude oil may be about _______________ percent?

   A. 2
   B. 6
   C. 12
   D. 18

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. 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

10. Crude oils containing more than ____________ kg of total salts (expressed in terms of NaCl) per thousand barrel is called a ‘salty crude’ ?

    A. 1
    B. 5
    C. 15
    D. 25