Answer:
engine B is more efficient.
Explanation:
We know that Carnot cycle is an ideal cycle for all working heat engine.In Carnot cycle there are four processes in which two are constant temperature processes and others two are isentropic process.
We also kn ow that the efficiency of Carnot cycle given as follows
![\eta =1-\dfrac{T_1}{T_2}](https://tex.z-dn.net/?f=%5Ceta%20%3D1-%5Cdfrac%7BT_1%7D%7BT_2%7D)
Here temperature should be in Kelvin.
For engine A
![\eta =1-\dfrac{T_1}{T_2}](https://tex.z-dn.net/?f=%5Ceta%20%3D1-%5Cdfrac%7BT_1%7D%7BT_2%7D)
![\eta =1-\dfrac{273+20}{520+273}](https://tex.z-dn.net/?f=%5Ceta%20%3D1-%5Cdfrac%7B273%2B20%7D%7B520%2B273%7D)
![\eta =0.63](https://tex.z-dn.net/?f=%5Ceta%20%3D0.63)
For engine B
![\eta =1-\dfrac{T_1}{T_2}](https://tex.z-dn.net/?f=%5Ceta%20%3D1-%5Cdfrac%7BT_1%7D%7BT_2%7D)
![\eta =1-\dfrac{273+20}{820+273}](https://tex.z-dn.net/?f=%5Ceta%20%3D1-%5Cdfrac%7B273%2B20%7D%7B820%2B273%7D)
![\eta =0.73](https://tex.z-dn.net/?f=%5Ceta%20%3D0.73)
So from above we can say that engine B is more efficient.
Answer:
Hello your question is incomplete attached below is the missing part and answer
options :
Effect A
Effect B
Effect C
Effect D
Effect AB
Effect AC
Effect AD
Effect BC
Effect BD
Effect CD
Answer :
A = significant
B = significant
C = Non-significant
D = Non-significant
AB = Non-significant
AC = significant
AD = Non-significant
BC = Non-significant
BD = Non-significant
CD = Non-significant
Explanation:
The dependent variable here is Time
Effect of A = significant
Effect of B = significant
Effect of C = Non-significant
Effect of D = Non-significant
Effect of AB = Non-significant
Effect of AC = significant
Effect of AD = Non-significant
Effect of BC = Non-significant
Effect of BD = Non-significant
Effect of CD = Non-significant
Answer:
a)temperature=69.1C
b)3054Kw
Explanation:
Hello!
To solve this problem follow the steps below, the complete procedure is in the attached image
1. draw a complete outline of the problem
2. to find the temperature at the turbine exit use termodinamic tables to find the saturation temperature at 30kPa
note=Through laboratory tests, thermodynamic tables were developed, these allow to know all the thermodynamic properties of a substance (entropy, enthalpy, pressure, specific volume, internal energy etc ..)
through prior knowledge of two other properties such as pressure and temperature.
3. Using thermodynamic tables find the enthalpy and entropy at the turbine inlet, then find the ideal enthalpy using the entropy of state 1 and the outlet pressure = 30kPa
4. The efficiency of the turbine is defined as the ratio between the real power and the ideal power, with this we find the real enthalpy.
Note: Remember that for a turbine with a single input and output, the power is calculated as the product of the mass flow and the difference in enthalpies.
5. Find the real power of the turbine
Answer:
80grit
Explanation:
80 grit is coarsest grit that may be used on aluminum
The lowest grit sizes range from 40 to 60. From the given options 80 grit is practically available grit.
What is a sandpaper used for?
They are essentially used for surface preparation. Sandpaper is produced in a range of grit sizes and is used to remove material from surfaces, either to make them smoother (for example, in painting and wood finishing), to remove a layer of material (such as old paint), or sometimes to make the surface rougher (for example, as a preparation for gluing).
Answer:
hand tracing
Explanation:
as a programmer when we pretend computer in the debugging process by the step of each statement in recording
then there value of variable is hand tracing because as The hand tracking feature is the use of hands as an input method
so while recording value of each variable each step is hand tracing