The data unit created at the application layer is called a message, at the transport layer the data unit created is called either a segment or an user data-gram, at the network layer the data unit created is called the data-gram, at the data link layer the data-gram is encapsulated in to a frame and finally transmitted as signals along the transmission media.
Presence of aromatics in A. diesel increases its cetane number. B. kerosene increases its smoke point. C. petrol increases its octane number. D. all (a), (b) and (c).
The solvent used in Barisol dewaxing process is A. hexane B. furfural C. benzol and ethylene dichloride D. methyl ethyl ketone (MEK)
Choose the correct statement regarding thermal cracking. A. Moderate changes in operating temperature does not change the depth of cracking. B. Increased residence time results in the decreased severity of cracking. C. At low pressure, the yield of lighter hydrocarbons are more. D. Greater depth of cracking gives lower octane number gasoline.
A typical yield of diesel in straight run distillation of crude oil may be about __________ percent. A. 8 B. 18 C. 28 D. 35
Diesel index.(an alternative index for expressing the quality of diesel) is A. determined by using a test engine. B. not related to aniline point. C. equal to cetane number plus 3. D. all (a), (b) & (c).
Which is almost absent in crude petroleum? A. Olefins B. Mercaptans C. Naphthenes D. Cycloparaffins
Tetra-ethyl lead is added in gasoline to A. increase its smoke point. B. reduce gum formation. C. reduce the pour point. D. increase its octane number.
Which of the following is an additive used for improving the cetane number of diesel? A. Tetraethyl lead B. Tetramethyllead C. Ethyl nitrate or acetone D. None of these
Flash point of diesel/kerosene (>50°C) is determined by the A. Abel apparatus B. Pensky-Martens apparatus C. Saybolt chromometer D. none of these
Aromatics are desired constituents of A. lubricating oil B. diesel C. kerosene D. petrol
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