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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.
| 101. |
What is the enthalpy of a mixture having 10% of A with enthalpy 10 J, and 90% of B with enthalpy 20 J? |
| A. | 10 J |
| B. | 15 J |
| C. | 18 J |
| D. | 19 J |
| Answer» E. | |
| 102. |
What is the value of CP – CV for ideal gases? |
| A. | 0 |
| B. | R/2 |
| C. | R |
| D. | 2R |
| Answer» D. 2R | |
| 103. |
How long would it take for a reversible process to complete? |
| A. | Instant |
| B. | Infinite |
| C. | Depends on the process |
| D. | None of the mentioned |
| Answer» C. Depends on the process | |
| 104. |
Heat of fusion of benzene is 10 J at 0°C, if Cp of solid benzene is 10 J/°C, and that of liquid benzene is 5 J/°C what is the enthalpy change of benzene from – 10°C to 10°C? |
| A. | 160 J |
| B. | 200 J |
| C. | 240 J |
| D. | 300 J |
| Answer» B. 200 J | |
| 105. |
What is the reversible work done if 4 m³ of an ideal gas is compressed isothermally from 2 Pa to 8 Pa? |
| A. | 2.01 J |
| B. | 6.11 J |
| C. | 8.56 J |
| D. | 11.09 J |
| Answer» E. | |
| 106. |
For an ideal gas isothermal process what is the work done by the gas from 4 Pa to 1 Pa at 300 K? |
| A. | 1.22 kJ |
| B. | 2.15 kJ |
| C. | 2.83 kJ |
| D. | 3.45 kJ |
| Answer» E. | |
| 107. |
The specific volume of a gas is 3 m³/Kg, at 6 Pa, H = 4 J/Kg and at 9 Pa, H = 14 J/Kg, what is the heat transferred to the system? |
| A. | 0 |
| B. | 1 J/Kg |
| C. | 5 J/Kg |
| D. | 25 J/Kg |
| Answer» C. 5 J/Kg | |
| 108. |
Heat Capacity of CO₂ is given by 12 + 3T + T², what is the enthalpy change from 0°C to 6°C? |
| A. | 169 J |
| B. | 198 J |
| C. | 244 J |
| D. | 360 J |
| Answer» C. 244 J | |
| 109. |
In the reaction C + 2H₂ -> CH₄, if the heat liberated is -5 J, what is the heat of formation of CH₄? |
| A. | -5J |
| B. | 5 J |
| C. | 0 J |
| D. | Cannot be determined |
| Answer» C. 0 J | |
| 110. |
What is the difference between higher heating value and lower heating value if the product has 5 mole of H₂O and Enthalpy of vaporization is 10 J/mole at standard conditions? |
| A. | 10 J |
| B. | -10 J |
| C. | 50 J |
| D. | -50 J |
| Answer» D. -50 J | |
| 111. |
What is the final enthalpy of the solution made by mixing 5 grams of solution A having enthalpy 20 J with 15 grams of solution B having enthalpy 40 J? |
| A. | 10 J |
| B. | 20 J |
| C. | 25 J |
| D. | 35 J |
| Answer» E. | |
| 112. |
What is the enthalpy change of a reaction at 90°C, if the enthalpy of reactant at 90°C and 25°C are 60 J and 25 J, and enthalpy of product at 90°C and 25°C are 80 J and 10 J, and the enthalpy change of reaction at 25°C is 5 J? |
| A. | 10 J |
| B. | 50 J |
| C. | 110 J |
| D. | 150 J |
| Answer» D. 150 J | |
| 113. |
Ice having CP = 15 J/°C, is heated from -10°C to -4°C, what is the enthalpy change? |
| A. | 30 J |
| B. | 60 J |
| C. | 90 J |
| D. | 120 J |
| Answer» D. 120 J | |
| 114. |
Three feeds, 10 mole with H = 5 J/mole, 10 mole with H = 15 J/mole and 5 mole with 20 J/mole, what is the enthalpy of the products? |
| A. | 10 J/mole |
| B. | 12 J/mole |
| C. | 15 J/mole |
| D. | 24 J/mole |
| Answer» C. 15 J/mole | |
| 115. |
Enthalpy of reactants is 15 J/Kg and enthalpy of products is 40 J/Kg, what is the heat of reaction? |
| A. | -10 J/Kg |
| B. | 10 J/Kg |
| C. | -25 J/Kg |
| D. | 25 J/Kg |
| Answer» E. | |
| 116. |
What is the heat transferred for a 10 mole unsteady state closed system, if initial internal energy is 6 J/mole and final internal energy is 10 J/mole? |
| A. | 4 J |
| B. | 10 J |
| C. | 40 J |
| D. | 60 J |
| Answer» D. 60 J | |
| 117. |
2 Kg of water (CP = 0.15 J/Kg°C) is pumped to a height of 0.1 m, work done by the motor is 10 J/Kg, and heat liberated by it is 5 J/Kg, what is the final temperature of water if the initial temperature was 27°C? |
| A. | 10°C |
| B. | 19°C |
| C. | 27°C |
| D. | 37°C |
| Answer» E. | |
| 118. |
Enthalpy-Concentration diagram represents which type of solution? |
| A. | Binary |
| B. | Tertiary |
| C. | Quaternary |
| D. | None of the mentioned |
| Answer» B. Tertiary | |
| 119. |
What is the energy balance to open system? |
| A. | Energy in the system is constant |
| B. | Matter in the system is constant |
| C. | Matter is constant energy is variable |
| D. | Both matter and energy are variable |
| Answer» E. | |
| 120. |
What are the total degrees of freedom if the number of species are 8, total streams are 4, stream temperature 2, stream pressure 2 and heat released 1, extent of reaction 3? |
| A. | 12 |
| B. | 16 |
| C. | 20 |
| D. | 24 |
| Answer» D. 24 | |
| 121. |
In a reactor two stream are entering, one with CO₂ at 10 atm and 27°C, and another with H₂O at 10 atm and 0°C, producing CH₄, CO₂, H₂O, and O₂ at 10 atm and 23°C, what are the total degrees of freedom? |
| A. | 10 |
| B. | 15 |
| C. | 17 |
| D. | 21 |
| Answer» D. 21 | |
| 122. |
What is the heat of reaction for C₆H₆ + 3H₂ -> C₆H₁₂, if heat of formation of C₆H₆, H₂, and C₆H₁₂ are 25 J, 5 J and 50 J respectively? |
| A. | 10 J |
| B. | 20 J |
| C. | 30 J |
| D. | 35 J |
| Answer» B. 20 J | |
| 123. |
Which of the following is heat required in phase transitions? |
| A. | Latent Heat |
| B. | Sensible Heat |
| C. | Depends on type of phase transition |
| D. | None of the mentioned |
| Answer» B. Sensible Heat | |
| 124. |
A mixture contains 20% O₂ with CP = 15 J/°C and 80% CO₂ with CP = 20 J/°C, what is the average CP of mixture? |
| A. | 3 J/°C |
| B. | 9 J/°C |
| C. | 16 J/°C |
| D. | 19 J/°C |
| Answer» E. | |
| 125. |
Energy out and Energy in of a system are 5 J and 25 J respectively, what is the efficiency of the system? |
| A. | 20% |
| B. | 40% |
| C. | 60% |
| D. | 80% |
| Answer» B. 40% | |
| 126. |
What are other effect occurs in the process for which theoretical flame temperature is defined? |
| A. | Electrical effects |
| B. | Free radical formation |
| C. | Ionization |
| D. | No other effects |
| Answer» E. | |
| 127. |
The mechanical energy balance is the product of equation of motion and which of the following? |
| A. | Mass |
| B. | Velocity |
| C. | Volume |
| D. | None of the mentioned |
| Answer» C. Volume | |
| 128. |
How long would it take for an irreversible process to complete? |
| A. | Instant |
| B. | Finite |
| C. | Infinite |
| D. | Cannot say |
| Answer» C. Infinite | |
| 129. |
The humidity at dry-bulb temperature of 20°C is 12% and the humidity at dry-bulb temperature of 23°C is 3%, what is the slope of adiabatic cooling line? |
| A. | -0.01 |
| B. | -0.02 |
| C. | -0.03 |
| D. | -0.05 |
| Answer» D. -0.05 | |
| 130. |
What is the temperature of the point of intersection of adiabatic cooling line and specific humid volume line? |
| A. | Wet-bulb temperature |
| B. | Dry-bulb temperature |
| C. | Dew point temperature |
| D. | None of the mentioned |
| Answer» C. Dew point temperature | |
| 131. |
What is the heat of reaction for N₂ + 3H₂ -> 2NH₃, if the heat of combustion of N₂ = 5 J, H₂ = 2 J, and NH₃ = 15 J? |
| A. | -5 J |
| B. | 5 J |
| C. | -19 J |
| D. | 19 J |
| Answer» D. 19 J | |
| 132. |
In the reaction 2H₂ + O₂ -> 2H₂O, if the heat liberated is 50 J, what is the heat of formation of H₂O? |
| A. | -25 J |
| B. | 25 J |
| C. | -50 J |
| D. | 50 J |
| Answer» B. 25 J | |
| 133. |
Which of the following cannot be treated as a variable for degrees of freedom calculation? |
| A. | Temperature |
| B. | Pressure |
| C. | Volume |
| D. | Work |
| Answer» D. Work | |
| 134. |
What is the enthalpy of reaction for CO₂ + 4H₂ -> 2H₂O + CH₄, if the conversion of CO₂ is 50%, and heat of formation of CO₂, H₂, H₂O, and CH₄ are 6 J, 0, 4 J and 10 J? |
| A. | 2 J |
| B. | 5 J |
| C. | 6 J |
| D. | 9 J |
| Answer» E. | |
| 135. |
What is the heat of reaction if the heat of combustion of products is 10 J and heat of combustion of reactants is 15 J? |
| A. | -5 J |
| B. | 5 J |
| C. | 10 J |
| D. | Cannot say |
| Answer» C. 10 J | |
| 136. |
What is the reversible work done if 4 m³ of an ideal gas is compressed adiabatically pV2.5 = K from 1 Pa to 32 Pa? |
| A. | 18.6 J |
| B. | 20.4 J |
| C. | 24.6 J |
| D. | 26.2 J |
| Answer» B. 20.4 J | |
| 137. |
What is the heat transferred from the system if the output sensible heat is 5 J, input sensible heat is 20 J, and heat of solution is 10 J? |
| A. | -10 J |
| B. | -5 J |
| C. | 0 |
| D. | 10 J |
| Answer» C. 0 | |
| 138. |
Two feeds, 5 mole with 25 J/mole and F with 5 J/mole, product contains two streams, 5 mole with 10 J/mole and 10 mole with 15 J/mole, what is the value of F? |
| A. | 10 mole |
| B. | 15 mole |
| C. | 20 mole |
| D. | 25 mole |
| Answer» E. | |
| 139. |
What is the work done by saturated water which evaporates to 10 kPa atmosphere to form 1 m³ of water vapor? |
| A. | 1 kJ |
| B. | -1 kJ |
| C. | 10 kJ |
| D. | -10 kJ |
| Answer» E. | |
| 140. |
What is the humidity at the point of intersection of dew point curve and wet-bulb line? |
| A. | Dry-bulb Humidity |
| B. | Wet-bulb Humidity |
| C. | Specific Humidity |
| D. | None of the mentioned |
| Answer» B. Wet-bulb Humidity | |
| 141. |
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, CO, H₂O, and O₂ at 10 atm and 23°C, what are the total degrees of freedom? |
| A. | 12 |
| B. | 16 |
| C. | 18 |
| D. | 20 |
| Answer» D. 20 | |
| 142. |
Three feeds, 10 mole with H = 15 J/mole, 20 mole with H = 5 J/mole and F1 with 20 J/mole, if enthalpy of the products is H = 15 J/mole, what is the value of F1? |
| A. | 10 mole |
| B. | 20 mole |
| C. | 30 mole |
| D. | 40 mole |
| Answer» E. | |
| 143. |
1 Kg of water (CP = 0.4 J/Kg°C) is pumped to a height of 2 m, work done by the motor is 50 J/Kg, and heat liberated by it is 10 J/Kg, what is the final temperature of water if the initial temperature was 25°C? |
| A. | 25°C |
| B. | 45°C |
| C. | 60°C |
| D. | 75°C |
| Answer» E. | |
| 144. |
What is the difference between lower heating value and higher heating value if the product has 2 mole of H₂O and Enthalpy of vaporization is 40 J/mole at standard conditions? |
| A. | -40 J |
| B. | 40 J |
| C. | -80 J |
| D. | 80 J |
| Answer» D. 80 J | |
| 145. |
For an ideal gas isobaric process what is the work done by the gas from 2 m³ to 0.5 m³ at 2 Pa? |
| A. | -3 J |
| B. | 3 J |
| C. | -5 J |
| D. | 5 J |
| Answer» B. 3 J | |
| 146. |
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 1000 Pa? |
| A. | 1.4 m |
| B. | 2.9 m |
| C. | 4.2 m |
| D. | 5.1 m |
| Answer» E. | |
| 147. |
A mixture contains 30% of A with Heat Capacity 10 J/°C, 30% of B with Heat Capacity 20 J/°C, and 40% of C with Heat Capacity 35 J/°C, what is the Heat Capacity of mixture? |
| A. | 14 J/°C |
| B. | 17 J/°C |
| C. | 19 J/°C |
| D. | 23 J/°C |
| Answer» E. | |
| 148. |
What is the enthalpy change of 20°C system if the heat capacity of air at 25°C is 5 J/°C and heat capacity of water vapor at 25°C is 10 J/°C, enthalpy of vaporization is 10 J, and the humidity is 20%? |
| A. | 25 J |
| B. | 37 J |
| C. | 44 J |
| D. | 51 J |
| Answer» C. 44 J | |
| 149. |
Which of the following does both of the reversible and irreversible processes involve? |
| A. | Increase molecular disorder |
| B. | Dissipative effects |
| C. | Friction |
| D. | All of the mentioned |
| Answer» B. Dissipative effects | |
| 150. |
What is the work done by an open steady-state system if heat transferred to it is 10 J? |
| A. | 0 |
| B. | -10 J |
| C. | 10 J |
| D. | Cannot be determined |
| Answer» D. Cannot be determined | |