Chemical Engineering

Open and Closed Systems

Question 1
Marks : +2 | -2
Pass Ratio : 100%
An egg is an example of which of the following?
Closed System
Open System
Isolated System
None of the mentioned
Explanation:
Since matter is neither entering nor leaving an egg, it’s a closed system.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
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?
12 g
20 g
32 g
40 g
Explanation:
Accumulation = 4*(8 – 3) = 20 g.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
How is the boundary wall of a closed system?
Impermeable
Permeable
Rigid
None of the mentioned
Explanation:
Since the matter is not allowed to cross the boundary wall of a closed system, so the wall is impermeable.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
A jar filled with water is an example of which of the following?
Closed System
Open System
Isolated System
None of the mentioned
Explanation:
Since water is neither leaving nor entering the jar, this means it is a closed system.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
A pressure cooker is an example of which of the following?
Closed System
Open System
Isolated System
None of the mentioned
Explanation:
Since steam is expelled outside in the cooker as the temperature increase, it is an open system.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
A country is an example of which of the following?
Closed System
Open System
Isolated System
None of the mentioned
Explanation:
Since a man can leave or enter a country it is an example of an open system.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
Which of the following is constant in a closed system?
Energy
Mass
Temperature
Momentum
Explanation:
A material neither leaves nor enters a closed system.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
The human body is an example of which of the following?
Closed System
Open System
Isolated System
None of the mentioned
Explanation:
Since air, water and food are going in and out of a human body, it’s an open system.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
What is the accumulation in the system after 10 second if the out flow and in flow rates are 10 g/s and 15 g/s?
5 g
10 g
50 g
100 g
Explanation:
Accumulation = 10*(15 – 10) = 50 g.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
Desert Cooler is an example of which of the following?
Closed System
Open System
Isolated System
None of the mentioned
Explanation:
Since water is filled and then it vaporizes in desert cooler, this means the material is flowing in and out of the system, so it is an open system.