Light oil whose major component is benzol, is obtained by the distillation of crude tar in the temperature range of __________ °C.

In a refinery petroleum crude is fractionated into gas fraction, light ends, intermediate distillates, heavy distillates, residues and by products. The group of products including gas oil, diesel oil and heavy fuel oil belongs to the fraction

A

Heavy distillates

B

Intermediate distillates

C

Light ends

D

Residues

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

Of the total tar present in raw coke oven gas, the tar recovered in primary cooler is about __________ percent.

A

5

B

25

C

55

D

75

Pitch (a product of coal tar distillation) is always mixed with creosote oil, when it is to be burnt in a burner, because

A

Its calorific value is very less

B

Tar neutralises the residual acids present in pitch

C

It reduces viscosity and imparts fluidity for its transportation through pipelines at economic pressure drop

D

All of the above

__________ base crude oil is also called asphaltic crude.

A

Paraffinic

B

Naphthenic

C

Mixed

D

Aromatic

Yield of pitch from distillation of high temperature tar is around __________ percent.

A

10

B

25

C

65

D

100

The amount of benzene present in pure benzol is about __________ percent.

A

30

B

50

C

70

D

90

For storing water and acid free benzol, use a __________ vessel.

A

Steel

B

Karbate

C

Stainless steel

D

None of these

A typical yield of diesel in straight run distillation of crude oil may be about __________ percent.

A

8

B

18

C

28

D

35

A typical yield of kerosene in straight run distillation of crude oil may be about __________ percent.

A

4

B

10

C

18

D

26

Light oil whose major component is benzol, is obtained by the distillation of crude tar in the temperature range of __________ °C.

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