All Free Chemical Engineering MCQs with Answers
Every Chemical Engineering question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
6,983 questions · page 31 of 350
- A. Dogleg severity
- B. Drill line system
- C. Drill line stream
- D. All of Above
Explanation: DLS means dogleg severity, the rate of change in a wellbore’s direction, usually expressed per unit length.
Correct answer: Dogleg severity- A. Rip in hole
- B. Run in hole
- C. Rest in hole
- D. None of these
Explanation: RIH means run in hole, describing the operation of lowering a drillstring, tool, or other equipment into the well.
Correct answer: Run in hole- A. Paraffins
- B. Aliphatic compounds
- C. Aromatic compounds
- D. Olefins
Explanation: High-temperature carbonization of coal produces coal tar rich in benzene, toluene, naphthalene, phenols, and other aromatic compounds.
Correct answer: Aromatic compounds- A. Coke Oven Gas
- B. Sulphide Coke
- C. Tar
- D. Pulverised coke
Explanation: Coke-oven gas contains hydrogen and hydrocarbons that produce substantial water vapour on combustion, which can appear as a white…
Correct answer: Coke Oven Gas- A. refined copper
- B. impure copper
- C. processed copper
- D. none of these
Explanation: Blister copper is the impure copper obtained after converting copper sulfide matte, typically containing about 98 to 99.5% copper along…
Correct answer: impure copper- A. 3 kmole/hr
- B. 4 kmole/hr
- C. 5 kmole/hr
- D. 6 kmole/hr
Explanation: An impurity balance gives 0.01F = 0.15P, so F = 15P. The n-butane balance, 0.99F = 70 + 0.85P, then gives 14P = 70 and P = 5 kmol/h.
Correct answer: 5 kmole/hr- A. 20
- B. 32.2
- C. 45.35
- D. 58.65
Explanation: The crystals contain Na2SO4 in the fraction 142/322 of their mass. A solute balance gives 30 = 0.10(100 - W) + (142/322)W, yielding W =…
Correct answer: 58.65- A. 82
- B. 164
- C. 41
- D. 8.2
Explanation: The reaction is CaO + 2HNO3 → Ca(NO3)2 + H2O. One mole of HNO3 is supplied, so it forms 0.5 mol of Ca(NO3)2, or 0.5 × 164 = 82 g.
Correct answer: 82- A. M
- B. M/2
- C. 2M
- D. M/4
Explanation: For gases at the same temperature and pressure, density is proportional to molecular weight because ρ = PM/RT.
Correct answer: 2M- A. 0.00
- B. 0.18
- C. 0.24
- D. 1.00
Explanation: The crystals contain 142/(142 + 180) = 0.441 of Na2SO4, so they remove 35.3 kg salt and 44.7 kg water.
Correct answer: 0.18- A. 10%
- B. 5%
- C. 18.18%
- D. 20%
Explanation: Take 100 mol of feed: it contains 10 mol H2, 10 mol O2 and 30 mol CO2, while water is removed on condensation.
Correct answer: 20%- A. Limiting the inerts
- B. Enriching the product
- C. Increasing the product yield
- D. Heat conservation
Explanation: A purge removes a portion of the recycle stream so inert or unwanted nonreactive material does not accumulate to excessive levels.
Correct answer: Limiting the inerts- A. Chlorine
- B. All the gases will have the same KE
- C. Ethane
- D. Nitrogen
Explanation: For an ideal gas, the average kinetic energy per mole is proportional only to temperature, specifically 3RT/2, and does not depend on…
Correct answer: All the gases will have the same KE- A. N
- B. N/2
- C. 4N
- D. 2N
Explanation: At the same reference conditions, equal gas volumes contain equal numbers of molecules according to Avogadro’s law.
Correct answer: 2N- A. 1
- B. 0.1
- C. 10
- D. 1000
Explanation: A torr is defined as one millimetre of mercury pressure, so 1 torr equals 1 mm Hg.
Correct answer: 1- A. H+ ions are absent
- B. Both H+ and OH- ions are present in very small but equal concentration
- C. OH- ions are absent
- D. None of these
Explanation: A neutral solution has equal concentrations of H⁺ and OH⁻ ions; at 25°C, each is about 10⁻⁷ mol/L.
Correct answer: Both H+ and OH- ions are present in very small but equal concentration617. Number of gm moles of solute dissolved in one liter of a solution is called its____________________?
- A. Equivalent weight
- B. Molality
- C. Molarity
- D. Normality
Explanation: Molarity is the number of gram-moles of solute per litre of solution. Molality instead uses kilograms of solvent, while normality uses…
Correct answer: Molarity- A. All A., B. & C.
- B. Kg-mole of solute/kg-mole of solvent
- C. Kg-mole of solute/1000 kg of solvent
- D. Kg of solute/kg of solvent
Explanation: Ratios based on amounts of solute and solvent, such as kg/kg, kg-mol/kg-mol, and kg-mol per 1000 kg solvent, do not change with…
Correct answer: All A., B. & C.- A. Mass number
- B. Atomic number
- C. Atomic weight
- D. Metallic characteristics
Explanation: The modern periodic table is arranged by increasing atomic number, which is the number of protons in the nucleus.
Correct answer: Atomic number620. The most convenient way of expressing solution concentration is in terms of___________________?
- A. Mole fraction
- B. Normality
- C. Molarity
- D. Molality
Explanation: Molarity is commonly convenient because it directly relates moles of solute to a measured volume of solution and is widely used in…
Correct answer: Molarity