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Chemical Engineering Practice Test: Material Balances
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Material Balances topics include: Open and closed systems, material balance chemical reaction, multiple component systems and material balances for batch and semi-batch processes. A material balance is a calculation of the quantities of materials that enter and leave a system or process. It is based on the law of conservation of mass, which states that matter is neither created nor destroyed in a process.  In a chemical system, the mass entering the system is equal to the mass leaving the system for steady-state conditions. The principles of material balance are used to determine the input... Show more
Chemical Engineering Practice Test: Material Balances
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25 Questions

1. The flow in rate of H2SO4 and NaCl in a system are 2 mole/hr each what is the flow out rate of HCl?
2. The rate of flow in stream with 40% O2 and 60% CO2 is 10 mole/hr, the contained was initially filled with 6 mole of O2, what will be the percentage of O2 in product stream?
3. The flow in rate of A and B are 8 mole/s and 10 mole/s respectively, which under goes reaction 4A + 5B -> 3C, what is the flow out rate of C?
4. The flow in rate of CH4 and O2 in a system are 2 mole/hr each what is the flow out rate of CO2?
5. A reactor has two feed streams with the ratio of their rate as 1:9 and has O2 and O3 with the mass fraction of 0.6 and 0.4 in stream 1 and 0.2 and 0.8 in stream 2, what is the mass fraction of O2 in the product side?
6. The flow in rate of A is 8 mole/s, it undergoes a reaction 3A -> B, what are the moles of B that comes out after 6 seconds?
7. An egg is an example of which of the following?
8. What is the accumulation in the system after 4 second if the out flow and in flow rates are 3 g/s and 8 g/s?
9. Water flowing with TSS at the rate of 40 Liter/min, is discharged into a river flowing at the rate of 20 Liter/min, if the concentration of TSS in the river is 5 mg/L, what is the concentration of TSS in water?
10. In a batch process, 2 mole of SO2 and 3 mole of CO2 entered a vessel with some SO2, if 5 mole of product leaves the vessel, what is the percentage of SO2 in the product?
11. The flow in rate of A and B are 4 mole/s and 8 mole/s respectively, which under goes reaction A + B -> 3C, what is the flow out rate of C?
12. The flow in rate of A is 5 mole/s, it undergoes a reaction A -> 2B, what are the moles of B that comes out after 5 seconds?
13. In a steady-state reactive system, NaOH and HCl are supplied to the system both at the rate of 100 mole/min, then what is the rate of NaCl produced?
14. In a steady-state reactive system, 1 molar each of NaOH and HCl are supplied to the system both at the rate of 100 L/min, then what is the amount of NaCl produced?
15. 10 Kg of oil is burnt in a container and taken off from the container if 1% of oil remains on the container wall, how much oil is taken off?
16. In a system if, Accumulation = Input – Output + Generation – Consumption, where all the four terms are distinct and non-zero, then the system is which of the following?
17. The equation of material balance, (Final condition + Sum of outputs) is equal to which of the following?
18. In a random reaction 2 mole of CH4 and 1 mole of C2H4 are reacted, and 1 mole of C3H8 and 1 mole of CxHy are produced, what is x*y?
19. A reaction is A + 2B -> 3C, if 2 moles of A and 4 moles of B entered the system, what are the number of moles of C formed?
20. A reaction occurs in a vessel such that its mass does not change but its temperature is increased, then the system is which of the following?
21. The rate of flow in stream with 20% CH4 and 80% H2O is 5 mole/hr, the contained was initially filled with 3 mole of H2O, what will be the percentage of CH4 in product stream?
22. Waste water flowing with TSS concentration 40 mg/L at the rate of 10 Liter/min is discharged into the river if the river is flowing at the rate of 15 Liter/min, what is the concentration of TSS in the river?
23. What amount of 57 octane should be mixed with 3 liters of 63 octane to obtain 4 liters of 59 octane?
24. Water flowing in plants from tap through a pipe, the process is an example of which of the following process?
25. The human body is an example of which of the following?

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