1. An unsteady state system, the flow in rate of A is 10 mole/s, what is the flow out rate of B if the accumulation was 10 mole in 2 seconds?
a) 5 mole/s
b) 10 mole/s
c) 15 mole/s
d) 20 mole/s
Explanation:Flow rate of B = 10 – 10/2 = 5 mole/s.
2. An unsteady state system, the flow in the rate of A is 12 mole/s, what is the flow out rate of B if the accumulation was 18 mole in 3 seconds
a) 4 mole/s
b) 6 mole/s
c) 8 mole/s
d) 9 mole/s
Explanation: Flow rate of B = 12 – 18/3 = 6 mole/s.
3. An unsteady state system, the flow in rate of A is 5 mole/s, what is the flow out rate of B if the accumulation was 10 mole in 5 seconds?
a) 1 mole/s
b) 2 mole/s
c) 3 mole/s
d) 5 mole/s
Explanation: Flow rate of B = 5 – 10/5 = 3 mole/s.
4. An unsteady state system, the flow in rate of A is 8 mole/s, what is the flow out rate of B if the accumulation was 6 mole in 2 seconds?
a) 1 mole/s
b) 2 mole/s
c) 3 mole/s
d) 5 mole/s
Explanation: Flow rate of B = 8 – 6/2 = 5 mole/s.
5. An unsteady state system, the flow in the rate of A is 6 mole/s, what is the flow out rate of B if the accumulation was 18 mole in 9 seconds?
a) 1 mole/s
b) 2 mole/s
c) 3 mole/s
d) 4 mole/s
Explanation: Flow rate of B = 6 – 18/9 = 4 mole/s.
6. The general material balance equation for reactive system is Accumulation = Input + Generation – x, what is x?
a) Consumption – Output
b) Consumption + Output
c) Output – Consumption
d) None of the mentioned
Explanation: Accumulation = Input – Output + Generation – Consumption, => x = Consumption + Output.
7. 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?
a) Steady-state
b) Closed
c) Non-reactive
d) None of the mentioned
Explanation: As the formula involves input and output it is an open system, and also as it involves generation and consumption the system is reactive, and since the input is not equal to output so the system is unsteady-state, and the answer is d
8. In a system if, Accumulation = Generation – Consumption, where both the terms are distinct and non-zero, then the system is which of the following?
a) Steady-state
b) Closed
c) Non-reactive
d) None of the mentioned
Explanation: As the formula does not involve input and output it is a closed system
9. In a system if, Accumulation = Input – Output, where both the terms are distinct and non-zero, then the system is which of the following?
a) Steady-state
b) Closed
c) Non-reactive
d) None of the mentioned
Explanation: As the formula does not involve generation and consumption it is a non-reactive system.
10. 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?
a) 100 mole/min
b) 200 mole/min
c) 300 mole/min
d) 400 mole/min
Explanation: As the system is in steady-state, rate of product = rate of feed, => rate of NaCl = 100 + 100 = 200 mole/min.