Free Chemical Process Principles MCQs with Answers
2,710 Chemical Process Principles MCQs from Chemical Engineering, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
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2,710 questions · page 76 of 136
- A. °F = (°C + 17.778) × 1.8
- B. Temperature difference of 1°K = 1°C = 9/5°F
- C. °C = (F- 32) × 0.555
- D. °R = 273 + °F
Explanation: The Rankine conversion is °R = °F + 459.67, not °F + 273. The other expressions correctly represent temperature differences or the…
Correct answer: °R = 273 + °F- A. 0.065
- B. 0.65
- C. 6.5
- D. 65
Explanation: At NTP, 224 cc of hydrogen represents 224/22400 = 0.01 mol H₂. The zinc-to-hydrogen molar ratio is 1:1, so the required zinc mass is 0.01…
Correct answer: 0.651503. The number of water molecules present in a drop of water weighing 0.018 gm is 6.023 × __________?
- A. 1026
- B. 1023
- C. 1020
- D. 1019
Explanation: Water weighing 0.018 g contains 0.018/18 = 0.001 mol. Multiplying by Avogadro’s number gives 6.023 × 10²⁰ molecules.
Correct answer: 1020- A. Specific heat
- B. Vapour pressure
- C. Viscosity
- D. None of these
Explanation: Dissolving a solute generally changes the solution's specific heat, vapour pressure, and viscosity, so none of these properties is…
Correct answer: None of these- A. 4480
- B. 2240
- C. 1120
- D. 0.4
Explanation: Eight grams of calcium represents 8/40 = 0.2 mol, and the stoichiometry gives 0.2 mol of hydrogen.
Correct answer: 4480- A. Resistance to slag penetration
- B. Resistance to abrasion
- C. Stability of volume at high temperature
Explanation: The upper blast-furnace region is subjected mainly to impact and rubbing from descending solid burden, so resistance to abrasion is…
Correct answer: Resistance to abrasion- A. Cork
- B. Saw dust
- C. Sand
- D. Chemically prepared foam
Explanation: Cork, sawdust, and chemically generated foam create pores that remain after firing or decomposition.
Correct answer: Sand- A. Fireclay
- B. Carborundum
- C. Silica
- D. Magnesite
Explanation: Fireclay bricks are commonly used to line hot-metal runners because they withstand high temperature and contact with molten iron at…
Correct answer: Fireclay- A. 1 BTU =453.6 calories
- B. 1 BTU = 252 calories
- C. 1 calorie = 252 BTU
- D. 1 calorie = 453.6 BTU
Explanation: One British thermal unit is approximately 252 gram-calories, since 1 Btu = 1055 J and 1 calorie = 4.184 J. Therefore, 1 Btu = 252 calories.
Correct answer: 1 BTU = 252 calories- A. 6.023 x 10^13
- B. 6.023 x 10^10
- C. 6.023 x 10^7
- D. 1013
Explanation: At pH 13, the hydrogen-ion concentration is 10^-13 mol/L. One cubic centimetre is 10^-3 L, giving 10^-16 mol or approximately 6.023 × 10^7…
Correct answer: 6.023 x 10^7- A. 27
- B. 54
- C. 5.4
- D. 2.7
Explanation: The reaction is 2Al + 3/2O2 → Al2O3, so 1.5 mol of oxygen consumes 2 mol of aluminium. The aluminium mass is therefore 2 × 27 = 54 g.
Correct answer: 54- A. 1
- B. 10
- C. 100
- D. 1000
Explanation: One bar equals 100 kPa, whereas one standard atmosphere is about 101.325 kPa. Thus 1 bar is 0.987 atm, which is approximately 1 atmosphere.
Correct answer: 1- A. Charle's law
- B. Avogadro's hypothesis
- C. Dalton's law of partial pressures
- D. Boyle's law
Explanation: Gas collected over water is a moist mixture, so its total pressure equals the sum of the dry-gas and water-vapor partial pressures.
Correct answer: Dalton's law of partial pressures- A. kcal/kg-mole.°C
- B. Btu/lb-mole.°R
- C. kcal/kg-mole.°K
- D. Both B. & C.
Explanation: The universal gas constant is 1.987 kcal/(kg-mol·K) and equivalently about 1.987 Btu/(lb-mol·°R).
Correct answer: Both B. & C.- A. 6.023 x 10^23 molecules/kg.mole
- B. 6.023 x 10^23 molecules/gm.mole
- C. 6.023 x 10^16 molecules/kg.mole
- D. 6.023 x 10^26 molecules/gm.mole
Explanation: One gram-mole contains approximately 6.023 × 10²³ molecules, which is Avogadro’s number.
Correct answer: 6.023 x 10^23 molecules/gm.mole1516. The density of a liquid is 1500 kg/m3. Its value in gin/litre will be equal to________________?
- A. 1.5
- B. 15
- C. 150
- D. 1500
Explanation: Since 1 kg/m³ equals 1 g/L, 1500 kg/m³ is numerically 1500 g/L. Therefore, the value is 1500 in the stated mass-per-volume units.
Correct answer: 1500- A. 10-2
- B. 10-6
- C. 10-4
- D. 10-8
Explanation: One micron is 10⁻⁶ m, while one centimetre is 10⁻² m. Thus, 1 μm equals 10⁻⁴ cm.
Correct answer: 10-4- A. Vapors
- B. Neither A. nor B.
- C. Both A. & B.
- D. Gases
Explanation: Dry air means air from which water vapour has been removed, so it consists of a mixture of permanent gases such as nitrogen, oxygen and…
Correct answer: Gases- A. 283
- B. 566
- C. 293
- D. 141.5
Explanation: At constant pressure, Charles' law gives V₂/V₁ = T₂/T₁ using absolute temperatures.
Correct answer: 293- A. 0
- B. 1
- C. 10
- D. 100
Explanation: API gravity is calculated as 141.5 divided by specific gravity at 60°F, minus 131.5.
Correct answer: 10