1. Question: What is the difference between ID and FD fans?
2. Question: What is the difference between Piping and Pipeline?
3. Question: Why do gases have two specific heats of Cp and Cv while solids and liquids have only one?
4. Question: Why is Head used instead of Pressure for measuring pump’s energy?
5. Question: What is the difference between machine and engine? Or “Engine is machine, but machine is not engine”–Why?
6. Question: What is the difference between pump and compressor?
7. Question: What is the difference between unit operation and unit process? Or “Every unit process is unit operation, but every unit operation is not unit process”–Why?
8. Question: What is process unit?
9. Question: What is Settler?
10. Question: What is a process?
1. Question: What is the difference between ID and FD fans?
Answer: ID fan means Induced Draft fan while FD fan means Forced Draft fan. ID fan is used in the gas exit path and that’s why it creates negative pressure in the flow area or system. Besides hot gas (low density) is handled by ID fan. ID fan consumes comparatively high power.
FD fan is used in the gas inlet path and that’s why it creates positive pressure in the flow area or system. Besides comparatively cold gas or atmospheric air (high density) is handled by FD fan. FD fan consumes comparatively low power.
2. Question: What is the difference between Piping and Pipeline?
Answer: Pipeline is the long pipe which is made by connecting more pipes while piping is the pipe network.
3. Question: Why do gases have two specific heats of Cp and Cv while solids and liquids have only one?
Answer: Practically, solids and liquids are assumed to be incompressible. For this reason Cp and Cv values for them are almost same. So only a single value of specific heat is used for solids and liquids.
But for the gases, there is great difference between Cp and Cv as gases are compressible. That’s why both Cp and Cv values are used for the gases.
4. Question: Why is Head used instead of Pressure for measuring pump’s energy?
Answer: Head is used instead of Pressure for measuring pump’s energy because the pressure generated by the pump changes as the specific gravity of the liquid changes, but the head does not change.
5. Question: What is the difference between machine and engine? Or “Engine is machine, but machine is not engine”–Why?
Answer: Engine is a device which converts any available form of energy into mechanical energy while machine converts this type of mechanical energy supplied by engine into useful work. Actually engine is the heart of machine.
Machines, engines, electrical machines, mechanical machines, computing machines etc. are the examples of machines. Steam engines, diesel engines, internal combustion engines are the examples of engines.
So we can say that, “Engine is machine, but machine is not engine”
6. Question: What is the difference between pump and compressor?
Answer: Pump is a mechanical device which is used for increasing the pressure incompressible liquids.
Compressor is a mechanical device which is used for increasing the pressure of compressible fluids (Gas, Vapor etc.).
7. Question: What is the difference between unit operation and unit process? Or “Every unit process is unit operation, but every unit operation is not unit process”–Why?
Answer: There are some process units in which only the physical changes occur. The unit steps into this types of process units is called unit operations. Distillation, evaporation, conduction, drying, grinding, crushing etc. are the examples of unit operations.
There are some process units in which only the chemical or both the chemical and physical changes occur. Chemical change is must in unit process, but physical change may occur or may not occur. Hydrogenation, oxidation, polymerization, reduction, nitration etc. are the examples of unit processes.
So we can say that, “every unit process is unit operation, but every unit operation is not unit process”.
8. Question: What is process unit?
Answer: A process is an equipment or apparatus in which one of the operations of the process is carried out. Reactor, heat exchanger, oxidizer, extractor, distillation column etc. are the examples of process units.
9. Question: What is Settler?
Answer: A device in which two liquid phases or liquid and solid phases separate by gravity.
10. Question: What is a process?
Answer: A process is any operation or series of operation that causes a physical or chemical change in a substance or a mixture of substances. The material that enters the process is called input or feed. And the material that leaves the process is called output or product.
Note:
We have to work hard and invest a lot of time for managing this website (Chemical Engineering Spot) and bringing every article in front of you. So if you like the post, please don't forget to leave your valuable comments and share the post with your friends in different social networking sites. This will encourage us to write better articles for you. Thanks.
You can also read:
1. 10 Chemical Engineering Related Questions and Answers-5
2. 10 Chemical Engineering Related Questions and Answers-2
3. 10 Chemical Engineering Related Questions and Answers-3
4. 10 Chemical Engineering Related Questions and Answers-4
