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MCQOPTIONS
This section includes 361 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
What is the final enthalpy of the solution made by mixing 20 grams of solution A having enthalpy 5 J with 5 grams of solution B having enthalpy 10 J? |
| A. | 2 J |
| B. | 4 J |
| C. | 6 J |
| D. | 7 J |
| Answer» D. 7 J | |
| 2. |
What is the enthalpy of a mixture having 20% of A with enthalpy 20 J, 30% of B with enthalpy 40 J, and 50% of C with enthalpy 20 J? |
| A. | 26 J |
| B. | 29 J |
| C. | 31 J |
| D. | 34 J |
| Answer» B. 29 J | |
| 3. |
What is the enthalpy of the reaction from 15°C to 25°C if CP = 3 J/°C, and the reference enthalpy is 15 J? |
| A. | 15 J |
| B. | 30 J |
| C. | 45 J |
| D. | 60 J |
| Answer» D. 60 J | |
| 4. |
What is the enthalpy of the reaction from 10°C to 15°C if CP = 5 J/°C, and the reference enthalpy is 25 J? |
| A. | 25 J |
| B. | 50 J |
| C. | 75 J |
| D. | 100 J |
| Answer» C. 75 J | |
| 5. |
What is the heat of reaction for C₆H₆ + 3H₂ -> C₆H₁₂, if the heat of combustion of H₂ = 2 J, C₆H₆= 30 J, and C₆H₁₂ = 25 J? |
| A. | -6 J |
| B. | 6 J |
| C. | -11 J |
| D. | 11 J |
| Answer» E. | |
| 6. |
What is the computer code used in flow sheeting? |
| A. | process simulator |
| B. | process settler |
| C. | process developer |
| D. | All of the mentioned |
| Answer» B. process settler | |
| 7. |
What is the enthalpy of reaction for C₂H₄ + 3O₂ -> 2CO₂+ 2H₂O, if the conversion of CH₄ is 50%, and heat of formation of CH₄, O₂, CO₂, and H₂O are 10 J, 0, 6 J and 4 J? |
| A. | 0 |
| B. | 2 J |
| C. | 5 J |
| D. | 10 J |
| Answer» E. | |
| 8. |
What is the height difference of the water (density = 1000 Kg/m³), if the change in Velocity is 10 m/s and change in pressure is 500 Pa? |
| A. | 1.01 m |
| B. | 5.05 m |
| C. | 10.1 m |
| D. | 20.2 m |
| Answer» C. 10.1 m | |
| 9. |
The specific volume of a gas is 5 m³/Kg, at 25 Pa, H = 40 J/Kg and at 40 Pa, H = 90 J/Kg, what is the heat transferred to the system? |
| A. | -5 J/Kg |
| B. | 5 J/Kg |
| C. | -25 J/Kg |
| D. | 25 J/Kg |
| Answer» D. 25 J/Kg | |
| 10. |
What is the heat of reaction if the heat of combustion of products is 25 J and heat of combustion of reactants is 15 J? |
| A. | -5 J |
| B. | 5 J |
| C. | -10 J |
| D. | 10 J |
| Answer» D. 10 J | |
| 11. |
Which of the following is also called adiabatic cooling? |
| A. | Humidification |
| B. | Humidity |
| C. | Humid temperature |
| D. | None of the mentioned |
| Answer» B. Humidity | |
| 12. |
The specific volume of SO₂ is 10 m³/Kg, at 5 Pa, H = 100 J/Kg and at 10 Pa, H = 250 J/Kg, what is the heat transferred to the system? |
| A. | 100 J/Kg |
| B. | 150 J/Kg |
| C. | 250 J/Kg |
| D. | 350 J/Kg |
| Answer» B. 150 J/Kg | |
| 13. |
The input mass in a process simulator is 10 Kg, what will be the output mass? |
| A. | 0 |
| B. | 5 Kg |
| C. | 8 Kg |
| D. | 10 Kg |
| Answer» E. | |
| 14. |
What is the work done for ideal gas isothermal process? |
| A. | Zero |
| B. | Equal to heat transferred |
| C. | Equal to change in internal energy |
| D. | Cannot say |
| Answer» C. Equal to change in internal energy | |
| 15. |
The humidity at dry-bulb temperature of 23°C is 30% and the humidity at dry-bulb temperature of 28°C is 25%, what is the slope of adiabatic cooling line? |
| A. | -0.01 |
| B. | -0.02 |
| C. | -0.03 |
| D. | -0.05 |
| Answer» B. -0.02 | |
| 16. |
What is the heat transferred for an unsteady state closed system, if change in enthalpy is 15 J, and change in volume is 2 m³ at constant pressure 5 Pa? |
| A. | 10 J |
| B. | 15 J |
| C. | 20 J |
| D. | 25 J |
| Answer» E. | |
| 17. |
What is the enthalpy of the reaction from 10°C to 25°C if CP = 2 J/°C, and the reference enthalpy is 20 J? |
| A. | 50 J |
| B. | 60 J |
| C. | 75 J |
| D. | 90 J |
| Answer» B. 60 J | |
| 18. |
What is the heat transferred to the system if the enthalpy of the output is 10 J and input is 6 J? |
| A. | 4 J |
| B. | 5 J |
| C. | 6 J |
| D. | 8 J |
| Answer» B. 5 J | |
| 19. |
What is the heat transferred for an unsteady state closed system, if change in enthalpy is 5 J, and change in pressure is 10 Pa at constant volume 5 m³? |
| A. | 5 J |
| B. | 50 J |
| C. | 55 J |
| D. | 85 J |
| Answer» D. 85 J | |
| 20. |
In a reactor two stream are entering, one with CH₄ at 10 atm and 27°C, and another with O₂ at 10 atm and 0°C, producing CO₂ and H₂O at 10 atm and 23°C, what are the total degrees of freedom? |
| A. | 10 |
| B. | 12 |
| C. | 15 |
| D. | 17 |
| Answer» D. 17 | |
| 21. |
What is the efficiency of a heat engine with heat input 5 J and work output 8 J? |
| A. | 40% |
| B. | 80% |
| C. | 160% |
| D. | 200% |
| Answer» D. 200% | |
| 22. |
What is the heat of reaction for CH₄ + 2O₂ -> CO₂ + 2H₂O, if heat of formation of CH₄, O₂, CO₂ and H₂O are 10 J, 5 J, 6 J, and 12 J respectively? |
| A. | -10 J |
| B. | 10 J |
| C. | -20 J |
| D. | 20 J |
| Answer» C. -20 J | |
| 23. |
What is the enthalpy of the reaction from 25°C to 40°C if CP = 10 J/°C, and the reference enthalpy is 10 J? |
| A. | 80 J |
| B. | 120 J |
| C. | 160 J |
| D. | 200 J |
| Answer» D. 200 J | |
| 24. |
If Cp of water is 45T J/°C, what is the enthalpy change of water from 6°C to 8°C? |
| A. | 7 J |
| B. | 14 J |
| C. | 28 J |
| D. | 56 J |
| Answer» C. 28 J | |
| 25. |
Cp of ice is 25 J/°C and that of water is 30 J/°C, what is the enthalpy change of water from – 10°C to 35°C at standard conditions, if the later heat of fusion of water is 110 J? |
| A. | 250 J |
| B. | 595 J |
| C. | 960 J |
| D. | 1410 J |
| Answer» E. | |
| 26. |
What is the specific humidity, if moles of water are 4 and total moles are 5? |
| A. | 20% |
| B. | 80% |
| C. | 200% |
| D. | 400% |
| Answer» E. | |
| 27. |
Free expansion of gas with frictionless piston is example which process? |
| A. | Reversible |
| B. | Irreversible |
| C. | Cannot say |
| D. | None of the mentioned |
| Answer» B. Irreversible | |
| 28. |
What is the heat of reaction if the heat of combustion of products is 10 J and heat of combustion of reactants is 5 J? |
| A. | -5 J |
| B. | 5 J |
| C. | 10 J |
| D. | Cannot be determined |
| Answer» B. 5 J | |
| 29. |
What is the enthalpy change of 30°C system if the heat capacity of air at 38°C is 5 J/°C and heat capacity of water vapor at 38°C is 10 J/°C, enthalpy of vaporization is 10 J, and the humidity is 60%? |
| A. | 14 J |
| B. | 39 J |
| C. | 65 J |
| D. | 94 J |
| Answer» E. | |
| 30. |
What is the height difference of the water (density = 1000 Kg/m³), if the change in Velocity is 2 m/s and change in pressure is 100 Pa? |
| A. | 0.21 m |
| B. | 0.42 m |
| C. | 0.56 m |
| D. | 0.84 m |
| Answer» B. 0.42 m | |
| 31. |
Which of the following is true for isothermal ideal gases? |
| A. | ∆T = 0 |
| B. | ∆U = 0 |
| C. | ∆H = 0 |
| D. | All of the mentioned |
| Answer» E. | |
| 32. |
The humidity at dry-bulb temperature of 20°C is 10% and the humidity at dry-bulb temperature of 23°C is 4%, what is the slope of adiabatic cooling line? |
| A. | -0.01 |
| B. | -0.02 |
| C. | -0.03 |
| D. | -0.05 |
| Answer» C. -0.03 | |
| 33. |
What is the heat transferred for a 10 mole unsteady state closed system, if change in internal energy is 5 J/mole? |
| A. | 5 J |
| B. | 10 J |
| C. | 50 J |
| D. | 100 J |
| Answer» D. 100 J | |
| 34. |
What is the heat evolved when a liquid solute is mixed with liquid solvent? |
| A. | Heat of solution |
| B. | Heat of mixing |
| C. | Heat of dissolution |
| D. | All of the mentioned |
| Answer» C. Heat of dissolution | |
| 35. |
What is the heat of solution in the energy balance? |
| A. | Heat of dissolution |
| B. | Heat of reaction |
| C. | Heat of formation |
| D. | None of the mentioned |
| Answer» C. Heat of formation | |
| 36. |
What is the work done by saturated water which evaporates to 1 kPa atmosphere to form 2 m³ of water vapor? |
| A. | -2 kJ |
| B. | 2 kJ |
| C. | -1 kJ |
| D. | 1 kJ |
| Answer» B. 2 kJ | |
| 37. |
What are the total degrees of freedom if the number of species are 4, total streams are 2, stream temperature 2, stream pressure 1 and heat released 1, extent of reaction 1? |
| A. | 4 |
| B. | 7 |
| C. | 11 |
| D. | 15 |
| Answer» D. 15 | |
| 38. |
150 J is the latent heat for vaporization of water, what is the heat of transition from 50°C water to 100°C steam if heat of transition from 50°C water to 100°C water is 12 J? |
| A. | 12 J |
| B. | 152 J |
| C. | 162 J |
| D. | 200 J |
| Answer» D. 200 J | |
| 39. |
The specific volume of a gas is 5 m³/Kg, at 10 Pa, H = 50 J/Kg and at 20 Pa, H = 100 J/Kg, what is the heat transferred to the system? |
| A. | 0 |
| B. | 50 J/Kg |
| C. | 100 J/Kg |
| D. | 150 J/Kg |
| Answer» B. 50 J/Kg | |
| 40. |
What is the heating value of 2 Kg of coal with heat of combustion 15 J/Kg? |
| A. | -15 J |
| B. | 15 J |
| C. | -30 J |
| D. | 30 J |
| Answer» D. 30 J | |
| 41. |
What is the heat of reaction for 2H₂ + O₂ -> 2H₂O, if heat of formation of H₂, O₂, and H₂O are 2 J, 5 J, and 10 J respectively? |
| A. | 2 J |
| B. | 5 J |
| C. | 8 J |
| D. | 11 J |
| Answer» E. | |
| 42. |
In a reactor two stream are entering, one with S at 10 atm and 27°C, and another with O₂ at 10 atm and 0°C, producing SO₂, SO₃, and O₂ at 10 atm and 23°C, what are the total degrees of freedom? |
| A. | 10 |
| B. | 13 |
| C. | 15 |
| D. | 17 |
| Answer» E. | |
| 43. |
What is the heat transferred to the system, if change in enthalpy is 15 J and change in volume is 2 m³ at 5 Pa? |
| A. | 5 J |
| B. | 8 J |
| C. | 10 J |
| D. | 12 J |
| Answer» B. 8 J | |
| 44. |
What is the enthalpy change of a reaction at 35°C, if the enthalpy of reactant at 35°C and 25°C are 22 J and 15 J, and enthalpy of product at 35°C and 25°C are 10 J and 5 J, and the enthalpy change of reaction at 25°C is 36 J? |
| A. | 12 J |
| B. | 24 J |
| C. | 36 J |
| D. | 48 J |
| Answer» E. | |
| 45. |
Steam having CP = 105 J/°C, is heated from 100°C to 104°C, what is the enthalpy change? |
| A. | 210 J |
| B. | 420 J |
| C. | 630 J |
| D. | 840 J |
| Answer» C. 630 J | |
| 46. |
In a reactor two stream are entering, one with H₂ at 10 atm and 27°C, and another with O₂ at 10 atm and 0°C, producing H₂O at 10 atm and 23°C, what are the total degrees of freedom? |
| A. | 10 |
| B. | 14 |
| C. | 16 |
| D. | 19 |
| Answer» C. 16 | |
| 47. |
What is the humid volume of the system at 100°F with humidity 20%? |
| A. | 18.6 ft3/lb |
| B. | 22.4 ft3/lb |
| C. | 26.5 ft3/lb |
| D. | 29.4 ft3/lb |
| Answer» B. 22.4 ft3/lb | |
| 48. |
Enthalpy of air is 10 J and enthalpy of water vapor is 15 J, if the total enthalpy of the system is 25 J, what is the humidity of the system? |
| A. | 20% |
| B. | 50% |
| C. | 100% |
| D. | 180% |
| Answer» D. 180% | |
| 49. |
Heat of formations of A, B, C, and D, are 5 J, 8 J, 2 J, and 15 J respectively, what is the heat of reaction 3A + B -> 3C + 2D? |
| A. | 9 J |
| B. | 10 J |
| C. | 13 J |
| D. | 15 J |
| Answer» D. 15 J | |
| 50. |
For endothermic reactions, what is the heat of reaction? |
| A. | Positive |
| B. | Negative |
| C. | Zero |
| D. | Cannot Say |
| Answer» B. Negative | |