Petroleum Refinery Engineering
Char value of Kerosene is the amount of charred oil deposition on the wick obtained after burning it in a standard wick lamp at a standard rate for 24 hours. Char value of a good quality kerosene should be less than __________ mg/kg of kerosene.

500
20
100
1

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Petroleum Refinery Engineering
Crude oil is subjected to vacuum distillation in the last stage, because

None of these
Lighter/low boiling products are prone to thermal decomposition
High boiling point products like heavy fuel oil & lubricating oils are heat sensitive and may decompose
High purity products can be obtained thereby

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