JUST PUT THE BRICK ON THE OTHER
Answer:
The correct option are;
American Institute of Architects
American Medical Association
American Society of Mechanical Engineers
Explanation:
A professional association is an association with the main purpose of promoting the basics and practices of a given profession. A professional association serves as a pillar for the interest of those practicing a particular profession and those of the best interest of the public.
The Business Professionals of America, DECA, Skills USA, and Future Educators are student associations while Screen Actors Guild is a labor union
Answer:
add resistance to a circuit
Explanation:
It depends on the design in which it is incorporated. A fixed resistor has many uses, including, but not limited to ...
- dropping voltage
- limiting current
- contributing to a time delay
- adjusting frequency response
- eliminating (or creating) signal reflections
- acting as a fuse
- calibrating or trimming a response
- providing protection against electrical shock or ESD
- acting as a reference when measuring variable resistors
Answer:
the isentropic efficiency of turbine is 99.65%
Explanation:
Given that:
Mass flow rate of LNG m = 20 kg/s
The pressure at the inlet
= 3000 kPa
turbine temperature at the inlet
= ( -160+273)K = 113K
The pressure at the turbine exit
= 300 kPa
Power produced by the turbine W = 120 kW
Density of LNG ![\rho = 423.8 \ kg/m^3](https://tex.z-dn.net/?f=%5Crho%20%3D%20423.8%20%5C%20kg%2Fm%5E3)
The formula for the workdone by an ideal turbine can be expressed by:
![W_{ideal} = \int\limits^2_1 {V} \, dP](https://tex.z-dn.net/?f=W_%7Bideal%7D%20%3D%20%5Cint%5Climits%5E2_1%20%7BV%7D%20%5C%2C%20dP)
![W_{ideal} ={V} \int\limits^2_1 \, dP](https://tex.z-dn.net/?f=W_%7Bideal%7D%20%3D%7BV%7D%20%5Cint%5Climits%5E2_1%20%20%5C%2C%20dP)
![W_{ideal} ={V} [P]^2_{1}](https://tex.z-dn.net/?f=W_%7Bideal%7D%20%3D%7BV%7D%20%5BP%5D%5E2_%7B1%7D)
![W_{ideal} ={V} [P_1-P_2]](https://tex.z-dn.net/?f=W_%7Bideal%7D%20%3D%7BV%7D%20%5BP_1-P_2%5D)
We all know that density = mass * volume i.e ![\rho= m*V](https://tex.z-dn.net/?f=%5Crho%3D%20m%2AV)
Then ;
![V = \dfrac{m}{\rho}](https://tex.z-dn.net/?f=V%20%3D%20%5Cdfrac%7Bm%7D%7B%5Crho%7D)
replacing it into the above previous derived formula; we have:
![W_{ideal} ={ \dfrac{m}{\rho}} [P_1-P_2]](https://tex.z-dn.net/?f=W_%7Bideal%7D%20%3D%7B%20%5Cdfrac%7Bm%7D%7B%5Crho%7D%7D%20%5BP_1-P_2%5D)
![W_{ideal} ={ \dfrac{20}{423.8}} [3000-300]](https://tex.z-dn.net/?f=W_%7Bideal%7D%20%3D%7B%20%5Cdfrac%7B20%7D%7B423.8%7D%7D%20%5B3000-300%5D)
![W_{ideal} ={ \dfrac{20}{423.8}} [2700]](https://tex.z-dn.net/?f=W_%7Bideal%7D%20%3D%7B%20%5Cdfrac%7B20%7D%7B423.8%7D%7D%20%5B2700%5D)
![W_{ideal} =0.04719*[2700]](https://tex.z-dn.net/?f=W_%7Bideal%7D%20%3D0.04719%2A%5B2700%5D)
![W_{ideal} =127.42 kW](https://tex.z-dn.net/?f=W_%7Bideal%7D%20%3D127.42%20kW)
However ; the isentropic efficiency of turbine is given by the relation:
![n_{isen} =\dfrac{W}{W_{ideal}}](https://tex.z-dn.net/?f=n_%7Bisen%7D%20%3D%5Cdfrac%7BW%7D%7BW_%7Bideal%7D%7D)
![n_{isen} =\dfrac{120}{120.42}](https://tex.z-dn.net/?f=n_%7Bisen%7D%20%3D%5Cdfrac%7B120%7D%7B120.42%7D)
![n_{isen} =0.9965](https://tex.z-dn.net/?f=n_%7Bisen%7D%20%3D0.9965)
99.65%
Therefore, the isentropic efficiency of turbine is 99.65%