# Basic Chemical Engineering MCQ (Multiple Choice Questions)

1. What is the unit of specific gravity?
a) Dimensionless
b) m/s2
c) N/m3
d) Kg/m3

Explanation: Specific gravity of a substance is the ratio of density of the substance and density of a reference substance, so it is dimensionless.

2. Which of the following has the same number of moles as in 398 grams of CuSO4?
a) 35 grams of nitrogen
b) 58.5 grams of Sodium chloride
c) 2 grams of hydrogen
d) 40 grams of oxygen

Explanation: Number of moles of CuSO4 = 398/ 159 ≈ 2.5, and number of moles of oxygen = 40/16 = 2.5.

3. What is the specific gravity of 5 Kg of water occupied in 10 m3 with respect to 500 g/m3?
a) 2
b) 5
c) 0.5
d) 1

Explanation: Specific gravity = (5/10)/0.5 = 1.

4. What is the unit of mole fraction?
a) N/m3
b) m-2
c) Kg/m3
d) None of the mentioned

Explanation: Since the mole fraction is ratio of the moles of solute and the moles of solution, it has no unit.

5. What is the weight of 10 moles of a mixture with composition 15% O2, 25% SO2, 30% COCl2, 25% SO3 and 5% N2?
a) 564
b) 475
c) 867
d) 719

Explanation: Molecular weight of mixture = (15*32 + 25*64 + 30*99 + 25*80 + 5*28)/100 = 71.9, => Weight of mixture = 71.9*10 = 719.

6. What is the 100oC in degree Fahrenheit?
a) 100oF
b) 212oF
c) 460oF
d) 0oF

Explanation: Temperature = 9(100)/5 + 32 = 212oF.

7. What is the pressure of 1900 Torr in the bar?
a) 2.46
b) 2.87
c) 2.40
d) 2.68

Explanation: Pressure = 1900/760*100000/101325 = 2.4 bar.

8. Which of the following is not a pressure measuring device?
a) Galvanometer
b) Manometer
c) Barometer
d) None of the mentioned

Explanation: Galvanometer is used to measure current.

9. Which of the following is used for the pressure measurement of only liquid?
a) Differential Manometer
b) Manometer
c) Piezometer
d) None of the mentioned

Explanation: Piezometer is a pressure measuring device used to measure the pressure of liquid only.

10. Which of the following is a state function?
a) Entropy
b) Heat
c) Work
d) None of the mentioned

Explanation: Entropy is a state function as it does not depend on the path of the process.

11. Water boiling in a container is an example of which of the following?
a) Semi-batch
b) Batch
c) Batch & Semi-batch
d) Neither of them

Explanation: Since nothing is entering in the container but steam is leaving the container, it is neither a batch process nor a semi-batch process.

12. Which of the following is true about limiting reagents?
a) Consumes partially
b) Does not react
c) Consumes completely
d) None of the mentioned

Explanation: Limiting reagent is the reactant which reacts completely in a reaction.

13. Which of the following composition can be controlled by a bypass stream?
a) Feed
b) Process
c) Exit stream
d) None of the mentioned

Explanation: Bypass stream can be used to control the composition of a final stream.

14. Which of the following is not true about ideal gas molecules?
a) They do not have attractive forces
b) They have negligible size
c) They move in random motion
d) They do not apply pressure

Explanation: Ideal gas molecules apply pressure to the walls of a container.

15. Which of the following is true about compressibility of real gases?
a) Z < 1
b) Z > 1
c) Z = 1
d) Both Z < 1 and Z > 1

Explanation: For any value of compressibility except 1, the gas is real.

16. Which of the following is not the equation of state?
a) Charles Equation
b) Holborn Equation
c) Peng Robinson Equation
d) Van der Waals Equation

Explanation: Charles equation is simply P α 1/V which is not the equation of state.

17. A liquid evaporates first at which of the following conditions?
a) Low vapor pressure
b) High attraction forces
c) High boiling point
d) Low attraction forces

Explanation: A liquid evaporates first at low attraction forces.

18. Which of the following is the property of adsorbtion isotherm?
a) Monotonous
b) Linear
c) Decreasing
d) None of the mentioned

Explanation: Since the adsorbtion isotherms are always increasing they are monotonous.

19. Which of the following is true for an open system?
a) Non Flow system
b) Flow system
c) Cannot say
d) None of the mentioned

Explanation: Since matter can come in or out in an open system, it is a flow system.

20. Which of the following is not the type of energy?
a) Heat
b) Work
c) Enthalpy
d) Entropy

Explanation: Entropy is not a type of energy.

21. Which of the following a reversible process will involve?
a) Equilibrium transfer of energy
b) Dissipative effects
c) Friction
d) None of the mentioned

Explanation: Reversible process involves equilibrium transfer of energy.

31. Which of the following is not an example of mechanical energy?
a) Internal energy
b) Potential energy
c) Work
d) Kinetic energy

Explanation: Internal energy is not a mechanical energy.

22. Which of the following is a feature of process simulator?
a) Import and export data
b) Scheduling of batch operations
c) Equipment sizing functions
d) All of the mentioned

Explanation: All the options are the features of process simulator.

a) Compressors
b) Splitters
c) Heat exchangers
d) None of the mentioned

Explanation: Heat exchangers, Compressors, Splitters all are found in process simulators.

24. Which of the following cannot be treated as a variable for degrees of freedom calculation?
a) Volume
b) Work
c) Temperature
d) Pressure

Explanation: Since Volume is an extensive variable, it cannot be treated as a variable for degrees of freedom calculation.

25. Wet-bulb temperature is based on the equilibrium between rates of energy transfer to the bulb and which of the following?
a) Freezing of water
b) Evaporation of water
c) Saturation of water
d) None of the mentioned

Explanation: Wet-bulb temperature is based on the equilibrium between rates of energy transfer to the bulb and evaporation of water.

26. Which of the following is required for the calculation of heat of reaction in the energy balance?
a) Heat of formation
b) Heat of solution at reference state
c) Heat of dissolution at reference state
d) All of the mentioned

Explanation: Heat of solution at reference state, Heat of dissolution at reference state and heat of formation all are required in the calculation of Heat of reaction.

27. Which of the following is heat required in phase transitions?
a) Depends on type of phase transition
b) Latent Heat
c) Sensible Heat
d) None of the mentioned

Explanation: Heat required for phase transitions is latent heat.

28. Which of the following process P-V work in highest?
a) Second derivative is positive
b) Second derivative is zero
c) Second derivative is negative
d) All of the mentioned

Explanation: Work in highest when the area under the P-V curve is highest, which is when the second derivative of the curve is negative.

## Chapterwise Multiple Choice Questions on Basic Chemical Engineering

Our 1000+ MCQs focus on all topics of the Basic Chemical Engineering subject, covering 100+ topics. This will help you to prepare for exams, contests, online tests, quizzes, viva-voce, interviews, and certifications. You can practice these MCQs chapter by chapter starting from the 1st chapter or you can jump to any chapter of your choice.

## 1. Basic Chemical Engineering MCQ on Moles, Density & Concentration

The section contains Basic Chemical Engineering multiple choice questions and answers on concepts of mole, density, specific gravity, flow rate and mass fraction.

## 2. Basic Chemical Engineering Multiple Choice Questions on Temperature and Pressure

The section contains Basic Chemical Engineering questions and answers on concepts of temperature, pressure and differential measurements.

## 3. Basic Chemical Engineering MCQ on Introduction to Material Balances

The section contains Basic Chemical Engineering MCQs on concepts of material balances, open and closed systems, material balance chemical reaction, multiple component systems and material balances for batch and semi-batch processes.

## 4. Basic Chemical Engineering Multiple Choice Questions on General Strategy for Solving Material Balance Problems and Solving Material Balance Problems for Single Units

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## 5. Basic Chemical Engineering MCQ on The Chemical Reaction Equation & Stoichometry, Material Balances for Processes Involving Reaction and Multiple Units

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## 6. Basic Chemical Engineering Multiple Choice Questions on Recycle, Bypass, Purge, Ideal Gases and Real Gases

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## 7. Basic Chemical Engineering MCQ on Real Gases: Equations of State, Single Component Two Phase Systems, Saturation & Condensation

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## 8. Basic Chemical Engineering Multiple Choice Questions on Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria

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## 9. Basic Chemical Engineering MCQ on Liquids and Gases in Equilibrium with Solids and Energy: Terminology, Concepts, and Units

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## 10. Basic Chemical Engineering Multiple Choice Questions on Introduction to Energy Balances for Processes without Reaction and Calculation of Enthalpy Changes

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## 11. Basic Chemical Engineering MCQ on Application of Energy Balances in the Absence of Chemical Reactions and Energy Balances: How to Account for Chemical Reaction

This section contains Basic Chemical Engineering questions and answers on energy balance simplifications and solving, open and closed energy balance applications, enthalpy of formation and reaction, heat of combustion and the concepts of heat merging.

## 12. Basic Chemical Engineering Multiple Choice Questions on Energy Balances that Include the Effects of Chemical Reaction, Ideal Processes, Efficiency and the Mechanical Energy Balance and Heats of Solution and Mixing

The section contains Basic Chemical Engineering MCQs on degrees of freedom and their analysis, energy balance applications, ideal reversible processes and their efficiency, mechanical energy balance, mixing effect into energy balance and heat of solution, dissolution and mixing.

## 13. Basic Chemical Engineering MCQ on Humidity Charts & their Use, Analysis of the Degrees of Freedom in a Steady – State Process, Solving Material and Energy Balances Using Process and Unsteady State Material and Energy Balances

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