Question 1 : For gasoline, the flash point (<50°C) is determined by the
1. Saybolt chromometer.
2. Abel apparatus.
3. none of these.
4. Pensky-Marten's apparatus.
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Question 2 : Pick out the wrong statement about the smoking tendency of various hydrocarbon constituents of kerosene.
1. Smoking tendency of naphthenes decreases with its increasing molecular weight & also on addition of double bond.
2. Smoking tendency of paraffins increases with decrease in its molecular weight.
3. Smoking tendency of aromatics decreases with increase in its molecular weight.
4. Smoking tendency of hydrocarbons increases in the order : paraffins → isoparaffins → naphthenes → aromatics.
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Question 3 : Flash point of an oil is determined by the
1. Pensky Martens apparatus.
2. Ramsbottom apparatus.
3. Saybolt viscometer.
4. Conradson apparatus.
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Question 4 : Straight run naphtha is converted into high octane number petrol (gasoline) by catalytic
1. cracking
2. reforming
3. isomerisation
4. polymerisation
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Question 5 : Antioxidants are added in petrol to
1. minimise the gum formation.
2. impart colour to it, for easy identification.
3. prevent the lead build up in engines.
4. prevent icing of the carburettor.
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Question 6 : Which of the following categories of gasoline has the highest lead susceptibility ?
1. Platinum reformed gasoline
2. Catalytical cracked gasoline
3. Straight run gasoline
4. Polymer gasoline
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Question 7 : Gum formation in stored gasoline is mainly due to the
1. oxidation & polymerisation of unsaturates.
2. presence of sulphur.
3. alkylation of unsaturates.
4. higher aromatic content.
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Question 8 : Butadiene is a/an
1. naphthene
2. di-olefin
3. olefin
4. aromatic
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Question 9 : Equal volumes of aniline and diesel oil when mixed at room temperature (during summer) was found to be completely mis-cible. It means that the aniline point of the diesel is __________ the room temperature.
1. less than
2. more than
3. either more or less; depends on the room temperature
4. same as
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Question 10 : Gasoline extracted from natural gas (by compression and cooling) is called the __________ gasoline.
1. casing head
2. unleaded
3. polymer
4. straight run
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