Free Chemical Process Principles MCQs with Answers

• A. Liquefied petroleum gas (LPG)
• B. Coal bed methane (CBM)
• C. Natural gas
• D. Sewage gas

Explanation: LPG is rich in propane and butane, which have higher heating values per unit volume than the mainly methane-based fuel gases listed.

• A. O2
• B. CO2
• C. CO
• D. H2O

Explanation: Ammoniacal cuprous chloride forms a complex with carbon monoxide and removes it selectively from the flue-gas sample.

• A. Blast furnace coke
• B. Sub-bituminous coal
• C. Anthracite coal
• D. Low temperature coke

Explanation: Low-temperature coke has a more porous structure and retains greater chemical reactivity than strongly carbonised coke, anthracite, or…

• A. < 120
• B. > 120
• C. > 280
• D. 300-600

Explanation: The Abel apparatus is a closed-cup tester for oils with relatively low flash points, conventionally below about 120°F.

• A. Sulphur (4-6%)
• B. Volatile matter
• C. Ash
• D. Moisture

Explanation: Assam coals are notably troublesome because of their high sulphur content, commonly reported around 4–6%.

• A. High production of CO2
• B. Both B. and C.
• C. High production of CO
• D. Low production of CO2

Explanation: Increasing gasification temperature promotes the endothermic reduction of CO₂ to CO and shifts the water-gas reactions toward CO and H₂.

• A. Air
• B. Oxygen enriched air
• C. Oxygen
• D. None of these

Explanation: A bomb calorimeter burns the coal sample in a sealed vessel filled with high-pressure oxygen, ensuring complete combustion.

• A. Operate at very high pressure
• B. Is a moving bed reactor
• C. Cannot use coking coal
• D. Can give ammonia synthesis gas (H2 + N2)

Explanation: The Koppers-Totzek gasifier produces a CO–H₂ gas that can be conditioned into ammonia synthesis gas by adjusting its composition and…

• A. > 120
• B. < 120
• C. < 90
• D. 90-110

Explanation: The Pensky-Martens closed-cup apparatus is used for oils with flash points above about 120°F.

• A. Ammonia
• B. Coke
• C. Tar
• D. Coke oven gas

Explanation: High-temperature carbonisation is primarily carried out to produce strong, porous coke for metallurgical use.

• A. 10
• B. 25
• C. 50
• D. 75

Explanation: High-temperature carbonisation of wood typically gives about 25% charcoal, with the remaining material leaving mainly as gases, vapours…

• A. That present in volatile matters
• B. The total quantity of carbon present in the coal
• C. The one which is present in the residue after combustion
• D. Hundred minus the percentage of volatile matter, ash and moisture

Explanation: Fixed carbon is obtained by difference in proximate analysis: 100 minus the percentages of moisture, volatile matter and ash.

• A. Tends to shorten the flame
• B. Lengthens the flame
• C. Does not affect the flame length
• D. Increases the flame temperature

Explanation: A deficiency of air causes incomplete mixing and combustion, so the flame generally becomes longer and more luminous.

• A. 10,000
• B. 15,000
• C. 5,000
• D. 20,000

Explanation: Furnace oil has a calorific value of approximately 10,000 kcal/kg, comparable to other heavy petroleum fuels.

• A. Carburetted water gas
• B. Gobar gas
• C. Coke oven gas
• D. LPG

Explanation: LPG requires the most air per unit volume of fuel because it consists mainly of propane and butane, which need substantial oxygen for…

• A. Ethylene
• B. Pitch-creosote mixture (PCM)
• C. Naphthalene
• D. Benzol

Explanation: Benzol, naphthalene and pitch-creosote mixtures are recovered from high-temperature coal carbonisation.

• A. 1
• B. < 1
• C. > 1
• D. Unpredictable

Explanation: Air contains mostly nitrogen, which absorbs heat without contributing oxygen, so the adiabatic flame temperature in air is lower than in…

• A. Ash
• B. Sulphur & phosphorus
• C. None of these
• D. Moisture

Explanation: Good coking coal should have low ash, moisture, sulphur and phosphorus, so none of the listed high contents is desirable.

• A. L.D. converter gas
• B. Coke oven gas
• C. Blast furnace gas
• D. None of these

Explanation: Gross and net calorific values differ when combustion produces water from hydrogen, because the gross value includes condensation heat.

• A. Solid fuels
• B. Those fuels which are found in the crust of earth
• C. Liquid fuels
• D. Premature fuels with low calorific value

Explanation: Fossil fuels are formed from buried organic matter over geological time and occur in the Earth's crust.