Free Chemical Process Principles MCQs with Answers

• A. Lamp wick wetting characteristics
• B. Luminosity characteristics
• C. Aromatic content directly
• D. Burning characteristics

Explanation: Smoke point is the maximum flame height at which kerosene burns without producing smoke, so it indicates the fuel’s burning behaviour.

• A. Propane & butane
• B. Butane & ethane
• C. Methane & ethane
• D. Methane & carbon monoxide

Explanation: Household LPG is mainly a mixture of the liquefiable light hydrocarbons propane and butane.

• A. Sweetening
• B. Stabilisation
• C. Dehydration
• D. Visbreaking

Explanation: Stabilisation removes dissolved light hydrocarbons from crude oil or gasoline so that vapour pressure and handling losses are reduced.

• A. Furfural
• B. Methyl ethyl ketone
• C. Propane
• D. Liquid sulphur dioxide

Explanation: Propane dissolves the oil fractions while leaving asphaltic materials largely insoluble, so it is used in solvent deasphalting.

• A. Improvement of viscosity index
• B. Improvement of smoke point
• C. Reduction of breathing loss
• D. Removal of sulphur

Explanation: Hydrofining passes the petroleum fraction over a catalyst in the presence of hydrogen, converting sulphur compounds into hydrogen sulphide…

• A. n-paraffins
• B. Aromatics
• C. i-paraffins
• D. Naphthenes

Explanation: n-Paraffins are desirable in kerosene because they generally burn cleanly and provide a high smoke point.

• A. Vegetable
• B. Both A. and B.
• C. Animal
• D. Neither A. nor B.

Explanation: The conventional biogenic theory attributes petroleum to the buried remains of both plant and animal organisms, transformed by heat…

• A. 20-25
• B. 10-15
• C. 1-1.5
• D. 0.1-0.2

Explanation: Only a small fraction of crude oil boils in the straight-run LPG range, typically about 1 to 1.5 wt%.

• A. Discoloration of yellow glycerine
• B. Sugar refining
• C. Blast furnace for reduction of iron ore
• D. Manufacture of carbon electrode

Explanation: Petroleum coke is a carbon-rich solid used to manufacture carbon and graphite electrodes, especially for electrochemical and metallurgical…

• A. 87 & 94
• B. 94 & 87
• C. 94 & 100
• D. 83 & 100

Explanation: The conventional textbook comparison gives approximately 87 octane number for motor gasoline in India and 94 for the American…

• A. High freezing point aviation fuel
• B. Low viscosity index lube oil
• C. High viscosity index lube oil
• D. None of these

Explanation: Aircraft engines operate over a wide temperature range, so the lubricant must maintain nearly constant viscosity and remain effective at…

• A. Liquefied natural gasoline
• B. None of these
• C. Liquid natural gas
• D. Natural gasoline

Explanation: The heavier hydrocarbons that condense from wet natural gas are collectively called natural gasoline when they form a gasoline-range…

• A. Liquid SO2
• B. Propane
• C. Furfural
• D. Phenol

Explanation: The Edeleanu process selectively extracts aromatic hydrocarbons from petroleum fractions using liquid sulfur dioxide.

• A. Pour point
• B. Vapour locking tendency
• C. Cloud point
• D. Carbon residue

Explanation: Reid vapour pressure measures the volatility of gasoline at a specified temperature and therefore indicates its tendency to form vapour…

• A. 50
• B. 14
• C. 35
• D. 85

Explanation: Truck diesel engines generally use fuel with a cetane number around 45 to 55, making 50 the suitable approximate value.

• A. Either A. or B.
• B. Decreases
• C. Remain same
• D. Increases

Explanation: Within petroleum product families, heavier and denser fractions generally have greater intermolecular resistance to flow, so their…

• A. High cetane diesel
• B. Fuel oil
• C. High octane gasoline
• D. Smoke free kerosene

Explanation: Visbreaking mildly thermally cracks heavy residual fractions, lowering their viscosity and producing a more usable fuel oil.

• A. Reduce its cost
• B. Narrow down its explosion limit
• C. Assist in checking its leakage from cylinder
• D. Increase its calorific value

Explanation: LPG is naturally almost odorless, so a strong-smelling mercaptan is added to make leakage detectable before the gas reaches a dangerous…

• A. Low octane number motor fuels
• B. High octane number motor fuels
• C. High octane number aviation fuels
• D. Unleaded motor fuels

Explanation: Research octane number is the anti-knock rating measured by the research test method for motor gasoline, commonly associated with unleaded…

• A. All A., B. and C.
• B. Silica-alumina
• C. Bentonite clays
• D. Silica-magnesia

Explanation: Fluidised-bed catalytic cracking uses acidic solid catalysts, historically including silica-alumina, silica-magnesia and activated clay…