Petroleum Refinery Engineering MCQ Questions & Answers | Chemical Engineering Page-3 section-1

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21.
Which of the following categories of gasoline has the highest lead susceptibility?

A. Straight run gasoline

B. Platinum reformed gasoline

C. Catalytical cracked gasoline

D. Polymer gasoline

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22.
The main purpose of recycling the byproduct hydrogen gas in the reformer reactor is to

A. Obviate catalyst poisoning

B. Maintain the reaction temperature

C. Sustain the reactor pressure

D. Hydrogenate the feed stock

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23.
Pyrolysis of kerosene or natural gasoline is done to produce mainly the

A. Olefins and aromatics

B. Lighter paraffins

C. Stabilised gasoline

D. Diesel

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24.
Which of the following is desirable in diesel and kerosene but is undersirable in gasoline?

A. Aromatics

B. Mercaptans

C. Paraffins

D. Naphthenic acid

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Answer & Solution

Answer: Option C

Solution:

Let's break down why Paraffins are the correct answer.

Understanding the Fuels:
* Gasoline needs to resist "knocking" (a harmful rattling sound in the engine). Fuel's ability to resist knocking is measured by its octane number. A higher octane number is better for gasoline.
* Diesel needs to ignite easily and burn smoothly after being injected into the engine. This quality is measured by its cetane number. A higher cetane number is better for diesel.
* Kerosene is used for lamps, heaters, and jet fuel. It needs to burn cleanly and provide good heat.

Now let's look at the options:

1. Paraffins (Option C):
* For Gasoline: Straight-chain paraffins (a type of hydrocarbon) have a low octane number. This means they make gasoline more prone to knocking. So, paraffins are undesirable in gasoline.
* For Diesel: Paraffins have a high cetane number. This means they help diesel fuel ignite very easily and burn efficiently, which is exactly what diesel engines need. So, paraffins are desirable in diesel.
* For Kerosene: Paraffins help kerosene burn cleanly and provide good heating value, making them desirable in kerosene as well.

Because paraffins are undesirable in gasoline but desirable in diesel and kerosene, this option perfectly matches the question.

2. Aromatics (Option A):
* Aromatics generally have a high octane number, which means they are actually desirable in gasoline to prevent knocking. Therefore, they don't fit the "undesirable in gasoline" part of the question.

3. Mercaptans (Option B) and Naphthenic acid (Option D):
* Both Mercaptans (sulfur compounds that cause bad smell and corrosion) and Naphthenic acids (corrosive compounds) are always undesirable in ALL fuels (gasoline, diesel, kerosene). They cause problems like corrosion and need to be removed during refining. They are never considered "desirable" in any of these fuels.

Therefore, the only option that fits the description of being undesirable in gasoline but desirable in diesel and kerosene is Paraffins.

25.
Performance number of a liquid fuel is related to its

A. Wax content

B. Spontaneous ignition temperature

C. Knocking tendency

D. Sulphur content

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26.
Breathing loss on storage of gasoline occurs due to the

A. Presence of unsaturated air

B. Fluctuation of ambient temperature during day and night

C. Both A & B

D. Neither A nor B

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27.
Octane number of n-heptane is assumed to be

A. 100

B. 0

C. 70

D. ∞

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28.
Absolute vapor pressure of petrofuels is found by Reid bomb which is heated in water bath to 100°F. In Reid apparatus, the ratio of the volume of air chamber to that of the liquid fuel chamber is

A. 1

B. 2

C. 3

D. 4

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29.
Waxes present in petroleum products

A. Can be separated out by distillation

B. Are not soluble in them

C. Crystallise out at low temperature

D. Decrease their viscosity

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30.
Which of the following processes consumes hydrogen?

A. Fluid catalytic cracking

B. Visbreaking

C. Propane deasphalting

D. None of these

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Petroleum Refinery Engineering MCQ Questions & Answers | Chemical Engineering

21. Which of the following categories of gasoline has the highest lead susceptibility?

Answer & Solution

22. The main purpose of recycling the byproduct hydrogen gas in the reformer reactor is to

Answer & Solution

23. Pyrolysis of kerosene or natural gasoline is done to produce mainly the

Answer & Solution

24. Which of the following is desirable in diesel and kerosene but is undersirable in gasoline?

Answer & Solution

25. Performance number of a liquid fuel is related to its

Answer & Solution

26. Breathing loss on storage of gasoline occurs due to the

Answer & Solution

27. Octane number of n-heptane is assumed to be

Answer & Solution

28. Absolute vapor pressure of petrofuels is found by Reid bomb which is heated in water bath to 100°F. In Reid apparatus, the ratio of the volume of air chamber to that of the liquid fuel chamber is

Answer & Solution

29. Waxes present in petroleum products

Answer & Solution

30. Which of the following processes consumes hydrogen?

Answer & Solution

Read More Section(Petroleum Refinery Engineering)

21.
Which of the following categories of gasoline has the highest lead susceptibility?

22.
The main purpose of recycling the byproduct hydrogen gas in the reformer reactor is to

23.
Pyrolysis of kerosene or natural gasoline is done to produce mainly the

24.
Which of the following is desirable in diesel and kerosene but is undersirable in gasoline?

25.
Performance number of a liquid fuel is related to its

26.
Breathing loss on storage of gasoline occurs due to the

27.
Octane number of n-heptane is assumed to be

28.
Absolute vapor pressure of petrofuels is found by Reid bomb which is heated in water bath to 100°F. In Reid apparatus, the ratio of the volume of air chamber to that of the liquid fuel chamber is

29.
Waxes present in petroleum products

30.
Which of the following processes consumes hydrogen?