Petroleum Refinery Engineering

171. Pick out the correct statement pertaining to catalytic cracking.

  1. With increase in the reactor pressure, octane number of gasoline decreases
  2. With increase in the reactor temperature, gasoline yield decreases for a given conversion
  3. Percentage conversion increases with increase in the catalyst to oil ratio
  4. All (A), (B) and (C)

Correct answer: (D)
All (A), (B) and (C)

172. Pick out the correct statement.

  1. Paraffins have higher octane number than corresponding iso-paraffin
  2. Paraffins have lower smoke point than aromatics
  3. Suitability of kerosene as a fuel & as an illuminant may be determined by char value test
  4. Aviation fuel should have very high cloud point

Correct answer: (B)
Paraffins have lower smoke point than aromatics

173. Pick out the undesirable property for a solvent meant for dewaxing of lube oil.

  1. Complete miscibility with oil
  2. High solubility of wax in the solvent
  3. Both (A) and (B)
  4. Neither (A) nor (B)

Correct answer: (C)
Both (A) and (B)

174. Pick out the wrong statement about the smoking tendency of various hydrocarbon constituents of kerosene.

  1. Smoking tendency of hydrocarbons increases in the order: paraffins → isoparaffins → naphthenes → aromatics
  2. Smoking tendency of paraffins increases with decrease in its molecular weight
  3. Smoking tendency of naphthenes decreases with its increasing molecular weight & also on addition of double bond
  4. Smoking tendency of aromatics decreases with increase in its molecular weight

Correct answer: (B)
Smoking tendency of paraffins increases with decrease in its molecular weight

175. Pick out the wrong statement.

  1. A pale color of petroleum product indicates lower viscosity
  2. Color of petroleum products indicates the degree of refinement
  3. Lighter petroleum distillates are lighter in color than the heavier residual oils
  4. Fluorescence of oils helps to detect its adulteration

Correct answer: (A)
A pale color of petroleum product indicates lower viscosity

176. Platforming is a _________ process.

  1. Moving bed
  2. Fluidised bed
  3. Non-regenerative & fixed bed
  4. Regenerative

Correct answer: (C)
Non-regenerative & fixed bed

177. Polymerisation

  1. Produces i-octane from cracked gases containing i-butane and butene
  2. Causes olefins to combine with each other
  3. Causes aromatics to combine with each other
  4. Is aimed at producing lubricating oil

Correct answer: (B)
Causes olefins to combine with each other

178. Pour point and freezing point is equal for

  1. Petrol
  2. Diesel
  3. Water
  4. Crude petroleum

Correct answer: (C)
Water

179. Pour point of a petrofuel is

  1. Multiple of 3°F
  2. Multiple of 5°F
  3. 5°C below the temperature at which oil ceases to flow
  4. None of these

Correct answer: (C)
5°C below the temperature at which oil ceases to flow

180. Preheating temperature of medium viscosity furnace oil for better atomisation through burner is about _________ °C.

  1. 50
  2. 70
  3. 90
  4. 140

Correct answer: (C)
90

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