Question 31 : Glycol added to petrol acts as a/an __________ agent.
1. anti-icing
2. anti-knocking
3. anti-gum forming
4. dewaxing
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Question 32 : Catalytic cracking compared to thermal cracking of residue of vacuum distillation of crude oil
1. gives higher yield of petrol.
2. lower octane number of petrol.
3. higher sulphur content in the product.
4. higher gum forming material in petrol.
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Question 33 : Which one is used to determine the colour of petroleum products ?
1. Saybolt chromometer
2. Cleveland apparatus
3. Colour comparator
4. None of these
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Question 34 : Which is almost absent in crude petroleum?
1. Mercaptans
2. Olefins
3. Naphthenes
4. Cycloparaffins
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Question 35 : Illuminating characteristics of kerosene is expressed by its
1. luminosity number
2. aniline point
3. smoke point
4. aromatic content
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Question 36 : Naphthenic acid is a/an __________ compound.
1. nitrogen
2. oxygen
3. sulphur
4. none of these
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Question 37 : Choose the correct statement regarding thermal cracking.
1. Increased residence time results in the decreased severity of cracking.
2. Moderate changes in operating temperature does not change the depth of cracking.
3. At low pressure, the yield of lighter hydrocarbons are more.
4. Greater depth of cracking gives lower octane number gasoline.
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Question 38 : A typical yield of diesel in straight run distillation of crude oil may be about __________ percent.
1. 35
2. 38
3. 28
4. 8
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Question 39 : The coking process normally mostly used in Indian oil refineries is the __________ coking process.
1. delayed
2. flexi
3. fluid
4. contact
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Question 40 : Which of the following constituents present in petroleum is responsible for ash formation?
1. Organometallic compounds
2. Sulphur compounds
3. Nitrogen compounds
4. Oxygen compounds
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