Petroleum Refinery Engineering General Knowledge Multiple Choice Questions(MCQs) & Answers

1 Which of the following reactions is undesirable in the production of catalytically reformed gasoline ?

A Dehydrogenation of Naphthene

B Dehydrogenation of lower paraffins

C Dehydrocyclization of higher paraffins

D Isomerisation of paraffins

View Answer

Answer: Dehydrogenation of lower paraffins

2 The most important property for a jet fuel is its________________?

A Viscosity

B Freezing point

C Calorific value

D Flash point

View Answer

Answer: Freezing point

3 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

View Answer

Answer: 30-80

4 Which of the following is not an important property of fuel oil/furnace oil ?

A Sulphur content

B Viscosity

C Aniline point

D Flash point

View Answer

Answer: Aniline point

5 High aniline point of a petrofuel (say diesel) indicates that ________________?

A It is highly aromatic in nature

B It is highly paraffinic in nature

C It has a very low diesel index

D Its ignition quality is very poor

View Answer

Answer: It is highly paraffinic in nature

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

A 1.2

B 12

C 120

D 700

View Answer

Answer: 120

7 Liquefied Petroleum Gas (LPG) is mainly a mixture of _____________________?

A Propane & butane

B Methane & ethane

C High boiling olefins

D High boiling naphthenes

View Answer

Answer: Propane & butane

8 Which of the following has the lowest cetane number ?

A Aromatics

B i-paraffins

C Naphthene

D Olefins

View Answer

Answer: Aromatics

9 Pressure & temperature maintained in catalytic cracking is about__________________?

A 2 atm & 500°C

B 10 atm & 500°C

C 30 atm & 200°C

D 50 atm & 750°C

View Answer

Answer: 2 atm & 500°C

10 In catalytic cracking, the___________________?

A Gasoline obtained has a very low octane number

B Pressure & temperature is very high

C Gasoline obtained has very high aromatic content

D Gasoline obtained has very high amount of gum forming compounds

View Answer

Answer: Gasoline obtained has very high aromatic content

11 Carbon percentage (by weight) in crude petroleum may be about_________________?

A 85

B 48

C 32

D 28

View Answer

Answer: 85

12 CnH2n is the general formula for_______________?

A Olefins

B Naphthenes

C Both A. and B.

D Neither A. nor B.

View Answer

Answer: Both A. and B.

13 Which of the following has maximum hydrogen/carbon ratio (by weight) ?

A Naphtha

B Gasoline

C Diesel

D Fuel oil

View Answer

Answer: Gasoline

14 Reforming converts_________________?

A Olefins into paraffins

B Naphthenes into aromatics

C Naphthenes into olefins

D Naphthenes into paraffin

View Answer

Answer: Naphthenes into aromatics

15 Higher boiling fractions like atmospheric residue is distilled under vacuum at low temperature because at high temperature, there is a tendency of the predominance of ____________________?

A Thermal cracking

B Gum formation

C Coking

D Discoloration

View Answer

Answer: Coking

16 The best method of determining sulphur in crude oil is by the _______________ method?

A Kjeldahl

B Dumas

C Bomb calorimeter

D Junkers calorimeter

View Answer

Answer: Bomb calorimeter

17 Salt content (measured as sodium chloride) in electrically desalted crude oil comes down to a level of about __________________ ptb (pounds per thousand barrel) ?

A 0.03

B 3

C 35

D 70

View Answer

Answer: 3

18 Natural gas recovered along with crude oil from oil wells is called wet natural gas which has a higher ______________ compared to the dry natural gas?

A Unsaturated hydrocarbon content

B Calorific value

C Quantity of propane

D Quantity of butane

View Answer