Engineering Questions with Answers - Multiple Choice Questions
Applied Chemistry MCQ – Oxidation Stability and Aniline Number
Rate of oxidation in petroleum oil proceeds _________ at room temperature.
Explanation: Rate of the oxidation in petroleum oil proceeds slowly at room temperature. It proceeds faster at elevated temperature. Elevated temperature means above 200oC.
The moisture in the environment ________ the oxidation.
d) Do not change
Explanation: The factors increasing the oxidation are the two. They are the moisture present in environment is used to increase the oxidation and the presence of oxidation catalyst.
The retardation can be done by adding _________
a) Phenyl- α – napthylamine
b) Phenyl -β – napthylamine
c) Benzine- α – napthylamine
d) Benzine – α – napthylamine
Explanation: In most of the commercial oils, the rate of oxidation can be retarded by the addition of the sacrificial oxidation inhibitors like Phenyl -β – napthylamine.
Oxidation in lubricants is ________
Explanation: Oxidation in the lubricating oils in undesirable because the insoluble product or sludge may clog the oil holes, oil pipe lines, filters and the other parts of the lubricating system.
If the oxidation product is soluble then it is desirable for lubricants.
Explanation: If the oxidation product is soluble in the lubricating oil, then also it is not desirable because it circulates with the oil and may corrode or pit bearing surfaces and may form vanish like deposits and gums.
Aniline number is the minimum equilibrium solution temperature for ________ volume of aniline and lubricating oil.
d) Very high
Explanation: Aniline number is the minimum equilibrium solution temperature for equal volume of aniline and lubricating oil. The equal volume is taken then only it is known as aniline number.
Aniline ________ with oil.
b) Forms crystals
c) Forms lumps
Explanation: As like dissolves like, the aniline is the aromatic compound and it is miscible in the lubricating oil having high aromatic percentage of the hydrocarbons at lower temperature.
Lubricating oil having low aniline point results in _________
a) Deterioration of metal
b) Deterioration of rubber
c) Deterioration of wall of jar
d) Deterioration of iron
Explanation: The lubricating oil with low aniline point will tend to attack the rubber parts and results in deterioration of rubber and leakage may takes place.
The test tube in the determination of aniline number is made up of __________
a) Tempered glass
c) Heat resistant glass
d) Heated glass
Explanation: The test tube is made with heat resistant glass. The cork is fitted to it. It is fitted with stirrer and thermometer for even mixing of the aniline in oil and to know the temperature.
What is the length of the test tube in the determination of aniline number experiment?
Explanation: The test tube is having the length of 150mm. It has a diameter of 25mm. The stirrer is attached for even miscibility of aniline and the lubricating oil.