Chemical Process Calculation MCQs focuses on “Material Balances-V”.
1. A reaction has reactants 1 moles of H2O and 1 mole of NaCl, and products NaOH and HCl, what are the total moles of products?
a) 1
b) 2
c) 3
d) 4
Answer: b
Clarification: In the product there is one mole of NaOH and one mole of HCl is produced.
2. 5 moles of O2 is added to 5 moles of H2, how many moles of H2O will it produce?
a) 5
b) 10
c) 15
d) 20
Answer: b
Clarification: Per mole of Oxygen & Hydrogen there is two moles of water.
3. In a process, 5 Kgs of water is added to a container and after some interval 3 Kgs of water is taken out. If finally there is 7 Kgs of water then how much water was there in the very beginning?
a) 5 Kg
b) 10 Kg
c) 15 Kg
d) 20 Kg
Answer: a
Clarification: Final condition = Initial condition + sum of inputs – sum of outputs.
4. A bucket of water is filled with oil. What kind of system is this?
a) Open
b) Closed
c) Transient
d) None of the mentioned
Answer: b
Clarification: Oil is neither entering nor leaving.
5. The human body is _________
a) Closed System
b) Open System
c) Isolated System
d) None of the mentioned
Answer: b
Clarification: Since air, water and food is going in and out of a human body, it’s an open system.
6. A fluid enters system at the rate of 10 liters/s and leaves in two pathways one with 7 liters/s and other with 3 liters/s, then what type of flow it is?
a) Steady-state
b) Unsteady-state
c) Cannot say
d) None of the mentioned
Answer: a
Clarification: Since the flow in rate and flow out rate of the fluid are equal, the system is in steady-state.
7. A fluid enters system at the rate of 10 liters/s and leaves in two pathways one with 7 liters/s, then what type of flow it is?
a) Steady-state
b) Unsteady-state
c) Cannot say
d) None of the mentioned
Answer: b
Clarification: Since the flow in rate and flow out rate of the fluid are not equal, the system is in Unsteady-state.
8. A semi-batch process differ from an open process in ________
a) Input
b) Output
c) Generation
d) Consumption
Answer: b
Clarification: A semi-batch process does not have output, while an open system has output.
9. Wine pouring in a glass is an example of
a) Batch
b) Semi-batch
c) Neither of them
d) Both of them
Answer: b
Clarification: Wine enters but doesn`t leave, it`s a semi-batch.
10. Water boiling in a container is an example of Batch process.
The above given statement is
a) True
b) False
c) Neither true nor false
d) None of the mentioned
Answer: b
Clarification: Steam is leaving the container, it is neither a batch process nor a semi-batch process.