Petroleum Refinery Engineering

131. Maximum use of petroleum coke is in

1. Adsorption refining operation
2. Fuel gas manufacture
3. Carbon electrode manufacture
4. Iron ore reduction

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132. Maximum viscosity of tar/PCM/fuel oil for easy and efficient atomisation in conventional burner is _________ centistokes (or 100 Redwood I seconds).

1. 5
2. 25
3. 50
4. 100

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133. Mercaptans are

1. Low boiling sulphur compounds
2. Added in LPG cylinders to detect gas leakage by its smell
3. Undesirable in petrol, as they reduce its octane number
4. All (A), (B) and (C)

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134. Mercaptans are added to liquefied petroleum gas (LPG) to

1. Reduce its cost
2. Narrow down its explosion limit
3. Assist in checking its leakage from cylinder
4. Increase its calorific value

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135. Mercaptans is represented as (where R and R' are alkyl groups)

1. R-COOH
2. R-S-H
3. R-S-R
4. R-S-R'

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136. Methyl tertiary butyl ether (MTBE), a high octane (octane no. = 115) gasoline blending component is produced by the simple additive reaction of isobutylene with

1. Methyl alcohol
2. Ethyl alcohol
3. Methane
4. Ethane

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137. Molecular weight of crude petroleum may be around

1. 50
2. 250
3. 1500
4. 5000

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138. Molecular weight of petrol may be about

1. 40-60
2. 100-130
3. 250-300
4. 350-400

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139. Most commonly used crude heater before the fractionation tower in a refinery is the _________ heater.

1. Electric immersion
2. Pipestill
3. Steam coil
4. None of these

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140. Most widely used solvent for dewaxing is

1. Methyl-ethyl-ketone (MEK)
2. Naphtha
3. Petroleum ether
4. Sodium plumbite

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