All Free Chemical Engineering MCQs with Answers
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6,983 questions · page 70 of 350
1381. Blast furnace gas is a very poisonous gas because of its predominantly high _______________ content?
- A. H2O
- B. CO2
- C. CH4
- D. CO
Explanation: Blast furnace gas contains a substantial amount of carbon monoxide, which is highly poisonous because it combines with haemoglobin and…
Correct answer: CO- A. All A., B. and C.
- B. 22.4 Nm3
- C. 32 kg
- D. 1kg mole
Explanation: Twelve kilograms of carbon is 1 kg-mole, and complete combustion requires 1 kg-mole of oxygen.
Correct answer: All A., B. and C.1383. Adiabatic flame temperature of a fuel is dependent on the initial temperature of___________________?
- A. Fuel
- B. Both A. & B.
- C. Air
- D. Neither A. nor B.
Explanation: The adiabatic flame temperature is calculated from the enthalpy brought in by the reactants and the heat capacity of the products.
Correct answer: Both A. & B.- A. Ammonia & phenol
- B. Tar & creosote
- C. Benzene, toluene & xylene
- D. Anthracene & phenol
Explanation: Benzol is the light aromatic fraction obtained from coke-oven products, consisting mainly of benzene, toluene and xylenes.
Correct answer: Benzene, toluene & xylene- A. None of these
- B. Oxidation
- C. Hydrogenation
- D. Fermentation
Explanation: Gobar gas is formed when microorganisms decompose cow dung anaerobically in a digester, a process commonly described as fermentation.
Correct answer: Fermentation- A. Pulverised fuel
- B. Perfumes
- C. Insecticides
- D. Plastics
Explanation: Hard pitch, a high-carbon residue of coal-tar processing, can be used as a binding material in the manufacture of pulverised fuel.
Correct answer: Pulverised fuel- A. Increase in the c.v. of coke oven gas
- B. Increase in its throughput
- C. Decrease in the c.v. of coke oven gas
- D. No change in the c.v. of coke oven gas
Explanation: Undercharging leaves more free space and exposes the evolved vapours to stronger heating, promoting cracking of hydrocarbon vapours.
Correct answer: Decrease in the c.v. of coke oven gas- A. As a motor fuel blend
- B. For producing benzene, toluene & xylene by its distillation
- C. Neither A. nor B.
- D. Both A. & B.
Explanation: Benzol can be blended into motor fuel and can also be fractionated to recover benzene, toluene and xylene.
Correct answer: Both A. & B.- A. 1000
- B. 4000
- C. 6000
- D. 8000
Explanation: Middlings contain more ash and less combustible matter than clean coal, so their calorific value is intermediate or relatively low.
Correct answer: 4000- A. 2
- B. 3
- C. 4
- D. 5
Explanation: Complete combustion follows CO + ½O₂ → CO₂, so 2 Nm³ of CO needs 1 Nm³ of oxygen.
Correct answer: 5- A. Gasification of coal
- B. None of these
- C. Hydrogenation of coal to produce gasoline
- D. Synthesis of gasoline (from water gas)
Explanation: The Fischer-Tropsch process catalytically converts synthesis gas, mainly CO and H₂ from water gas, into liquid hydrocarbons such as…
Correct answer: Synthesis of gasoline (from water gas)1392. In flue gas analysis by Orsat's apparatus, carbon dioxide is absorbed by______________________?
- A. Potassium hydroxide
- B. Dilute potassium carbonate
- C. Cuprous chloride
- D. Alkaline pyrogallol solution
Explanation: Potassium hydroxide absorbs CO₂ in Orsat analysis by reacting with the acidic oxide to form potassium carbonate.
Correct answer: Potassium hydroxide- A. CO & H2
- B. CO & N2
- C. CO2 & N2
- D. CO2 & H2
Explanation: Producer gas is generated by passing air, often with steam, over red-hot coke, so it contains mainly CO formed from carbon and nitrogen…
Correct answer: CO & N2- A. Less volatile matter
- B. More carbon
- C. All A., B. and C.
- D. Greater percentage of ash
Explanation: Coking drives off much of coal's volatile matter and concentrates its fixed carbon, while the noncombustible ash becomes a larger…
Correct answer: All A., B. and C.- A. H2, CmHn & CO2
- B. CO2, O2 & CO
- C. CO, H2 & CH4
- D. N2, H2 & CO2
Explanation: Purified Lurgi gas is a synthesis or town-gas type mixture containing chiefly hydrogen, carbon monoxide, and methane, with impurities such…
Correct answer: CO, H2 & CH4- A. Neither A. nor B.
- B. Fussain
- C. Both A. & B.
- D. Vitrain
Explanation: Vitrain is a bright coal maceral that softens and becomes plastic during heating, making it coking.
Correct answer: Vitrain- A. Both steam and electrical power
- B. Both B. and C.
- C. Rich gas (e.g., coke oven gas)
- D. Lean gas (e.g., B.F. gas)
Explanation: Compound coke ovens are designed to operate with either lean gas, such as blast-furnace gas, or rich gas, such as coke-oven gas.
Correct answer: Both B. and C.- A. Pitch
- B. Blast furnace gas
- C. Fuel oil
- D. Bituminous coal
Explanation: The difference between gross and net calorific value is mainly the latent heat of water formed from hydrogen during combustion.
Correct answer: Fuel oil- A. Light paraffinic fuel oils is equal to that of equivalent olefins
- B. n-paraffin is lower than that of iso-paraffins of the same compounds
- C. Light paraffinic fuel oils is lower than that of equivalent olefins
- D. Light paraffinic fuel oils is higher than that of equivalent olefins
Explanation: Paraffinic hydrocarbons contain more hydrogen per carbon than the corresponding olefins, so their combustion releases more heat.
Correct answer: Light paraffinic fuel oils is higher than that of equivalent olefins- A. Fixed carbon
- B. Total carbon
- C. Hydrogen
- D. Nitrogen
Explanation: Ultimate analysis determines elemental carbon, hydrogen, nitrogen, sulfur and oxygen, whereas fixed carbon is obtained from proximate…
Correct answer: Fixed carbon