MCQOPTIONS
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MCQOPTIONS
This section includes 9 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. |
1 Kg of water (CP = 0.4 J/KgoC) 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 25oC? |
| A. | t25<sup>o</sup>C |
| B. | t45<sup>o</sup>C |
| C. | t60<sup>o</sup>C |
| D. | t75<sup>o</sup>C |
| Answer» E. | |
| 2. |
1 Kg of water (CP = 0.5 J/KgoC) is pumped to a height of 1 m, work done by the motor is 20 J/Kg, and heat liberated by it is 5 J/Kg, what is the final temperature of water if the initial temperature was 20oC? |
| A. | t20<sup>o</sup>C |
| B. | t30<sup>o</sup>C |
| C. | t40<sup>o</sup>C |
| D. | t50<sup>o</sup>C |
| Answer» C. t40<sup>o</sup>C | |
| 3. |
1 Kg of water (CP = 0.5 J/KgoC) is pumped to a height of 0.5 m, work done by the motor is 40 J/Kg, and heat liberated by it is 10 J/Kg, what is the final temperature of water if the initial temperature was 10oC? |
| A. | t10<sup>o</sup>C |
| B. | t30<sup>o</sup>C |
| C. | t40<sup>o</sup>C |
| D. | t60<sup>o</sup>C |
| Answer» E. | |
| 4. |
2 Kg of water (CP = 0.15 J/KgoC) 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 27oC? |
| A. | t10<sup>o</sup>C |
| B. | t19<sup>o</sup>C |
| C. | t27<sup>o</sup>C |
| D. | t37<sup>o</sup>C |
| Answer» E. | |
| 5. |
1 Kg of water is pumped to a height of 10 m, the enthalpy is changed by 50 J/Kg, and work done by the motor is 300 J/Kg, assuming a system is insulated what is the change in internal energy of water? |
| A. | t100 J |
| B. | t150 J |
| C. | t200 J |
| D. | t300 J |
| Answer» C. t200 J | |
| 6. |
1 Kg of water is pumped to a height of 1 m, the enthalpy is changed by 5 J/Kg, and work done by the motor is 25 J/Kg, assuming a system is insulated what is the change in internal energy of water? |
| A. | t10 J |
| B. | t25 J |
| C. | t35 J |
| D. | t50 J |
| Answer» B. t25 J | |
| 7. |
10 Kg of water is pumped to a height of 2 m, the enthalpy is changed by 15 J/Kg, and work done by the motor is 50 J/Kg, assuming system is insulated what is the change in internal energy of water? |
| A. | t50 J |
| B. | t100 J |
| C. | t150 J |
| D. | t200 J |
| Answer» D. t200 J | |
| 8. |
5 Kg of water is pumped to a height of 5 m, the enthalpy is changed by 10 J/Kg, and work done by the motor is 100 J/Kg, assuming system is insulated what is the change in internal energy of water? |
| A. | t50 J |
| B. | t100 J |
| C. | t150 J |
| D. | t200 J |
| Answer» E. | |
| 9. |
What is the energy balance to open system? |
| A. | tEnergy in the system is constant |
| B. | tMatter in the system is constant |
| C. | tMatter is constant energy is variable |
| D. | tBoth matter and energy are variable |
| Answer» E. | |