Which basic principle influences how all HVACR systems work?
A) A decrease in pressure increases the boiling point of liquid, the temperature at which the liquid turns to a gas.
B) An increase in pressure can lower the boiling point of a liquid and change the temperature at which it turns to a gas.
C) An increase in pressure can increase the boiling point of a liquid, the temperature at which the liquid turns to a gas.
D) Pressure affects boiling point and evaporation in an unpredictable way, so it must not be considered in HVACR equipment.
Answer:
B) An increase in pressure can lower the boiling point of a liquid and change the temperature at which it turns to a gas.
Explanation:
B) An increase in pressure can lower the boiling point of a liquid and change the temperature at which it turns to a gas.
The basic principle which influences how all HVACR systems work is that an increase in pressure can increase the boiling point of a liquid, the temperature at which the liquid turns to a gas. Thus, the correct option for this question is C.
What is an HVACR system?An HVACR system may be defined as a type of system that is significantly designed in order to achieve the environmental requirements of the comfort of occupants and a process. These systems are used in different types of buildings such as industrial, commercial, residential, and institutional buildings.
Heating, air conditioning, and refrigeration mechanics and installers, often called HVAC technicians, work on heating, ventilation, cooling, and refrigeration systems that control the temperature and air quality in buildings.
If you're interested in becoming qualified to install heating and cooling systems and you want to know more about the HVAC-R industry, read on for professional definitions and training options.
Therefore, the correct option for this question is C.
To learn more about the HVACR system, refer to the link:
https://brainly.com/question/29996270
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Reference sources reveal that a workpiece material has a unit horsepower of 1.6 hp/in3/min. For a turning operation, the cutting velocity is set at 500 ft/min with a corresponding feed of 0.025 in/rev. and a depth of cut of 0.2 in. From the given data, calculate:_______.
The question is incomplete. We have to calculate :
a). the cutting force
b). volumetric metal removal rate, MRR
c). the horsepower required at the cut
d). if the power efficiency of the machine tool is 90%, determine the motor horsepower
Solution :
Given :
Cutting velocity (v) = 500 ft/min
= 500 x 12 in/min
= 6000 in/min
Feed , f = 0.025 in/rev
Depth of cut, d = 0.2 in
b). Volumetric material removal rate, MRR = v.f.d
= 6000 x 0.025 x 0.2
= 30 [tex]$in^3 / min$[/tex]
c). Horsepower required = MRR x unit horsepower
= 30 x 1.6
= 48 hp
a). Cutting force,
[tex]$F=\frac{power}{cuting \ velocity}$[/tex]
[tex]$=\frac{48 \times 550}{500 /60}$[/tex] (1 hp = 550 ft lbf /sec)
= 3168 lbf
d). Machine HP required
[tex]$=\frac{HP}{\eta}$[/tex]
[tex]$=\frac{48}{0.9}$[/tex]
= 53.33 HP
1. What are the 2 circuits of a relay called?
What are the two tools used to create an HTML code? Name one example of each tool.
Answer:
please mark me as BRAINLIEST
Explanation:
There are so many software packages available to develop HTML. The software packages can be grouped into two main categories: text-based (or code-based) editors.
...
WYSIWYG editors
Macromedia Dreamweaver.
Microsoft FrontPage.
Adobe GoLive.
determine the application of star connected network
Answer:
fijixuc uckyc7fmtjjr hcumffjmfumfnng
Answer:
a method of connecting polyphrase circuits in which one end of each phase line is connected to a common neutral point that may be connected to the earth as protection against lightning or to a wire to which all the other neutral points of the system are connected
Explanation:
One way to improve the fuel efficiency of a car is to use tires that have a lower rolling resistance—tires that roll with less resistance. Highway tests at 65 mph showed that tires with the lowest rolling resistance can improve fuel efficiency by nearly 2 mpg (miles per gallon). Consider a car that gets 35 mpg on high-rolling-resistance tires and is driven 15,000 miles per year. For a fuel cost of $3.5/gal, determine how much money will be saved per year by switching to low-rolling-resistance tires.
Answer: It will be saved $81 per year.
Explanation: A car without the tires, that gets 35mpg and is driven 15,000 miles per year, will have a fuel cost of:
1 gal ---- 35 miles
x gal ---- 15,000 miles
x = [tex]\frac{15,000}{35}[/tex]
x = 428.57 gal
Per year, 1 gal costs $3.5, then:
cost = 428.57*3.5
cost = 1500
The car with the tires, improve the efficiency in nearly 2mpg, i.e.:
efficiency = 35 + 2 = 37mpg
1 gal ----- 37 miles
y gal ----- 15,000 miles
y = [tex]\frac{15000}{37}[/tex]
y = 405.40 gal
Per year:
cost = 405.40*3.5
cost = 1419
The difference in costs is:
d = 1500 - 1419
d = 81
With lowest rolling resistance tires, a car will save, per year, $81.
PLEASE HELP!
I'm in the middle of a test and the teacher didn't go over the material!
Answer:
1. 4/d and 1
2. Engineering tech with 3, Engineer with 1, and Scientist with 2
Explanation:
I'm pretty sure but tell me if im wrong
A liquid stream containing 52.0 mole% benzene and the balance toluene at 20.0°C is fed to a continuous single-stage evaporator at a rate of 1120 mol/s. The liquid and vapor streams leaving the evaporator are both at 99.0°C. The liquid phase leaving the evaporator is measured to be 32.5 mole% benzene.If the system obeys Raoult's Law and is in steady state, what are the operating pressure and vapor phase composition?1- P= mmHg2- ybenzene =
Answer:
Operating Pressure P = 793.716 mmHg
Y_Benzene y1 = 0.541
Explanation:
Given that;
liquid phase leaving the evaporator = 32.5 mole%
Equi Temp T = 99.0°C = 99 + 273.15 = 372.15 K
Now let 1 and 2 represent Benzene and Toluene respectively.
Antoine's Constant for these components are;
COMPONENETS A B C
Benzene 1 4.72583 1660.652 -1.461
Toluene 2 4.07827 1343.943 -53.773
Antoine's equation is expressed as;
Ps = 10^(A - (B/(T+C)))
Ps is in Bar and T is in Kelvin
so
P1s = 10^( 4.72583 - (1660.652/(372.15 - (-1.461)))) = 1.7617 Bar
P2s = 10^( 4.07827 - (1343.943/(372.15 - (-53.773)))) = 0.7195 Bar
now here, liquid leaving and vapor are both in equilibrium
composition of liquid leaving are;
X1 = 32.5% = 0.325
X2 = 1 - X1 = 1 - 0.325 = 0.675
Now
Raoult's Law is expressed as;
p × y1=x1 × pis for all components
So for Benzene ; p × y1=x1 × p1s ------let this be equation 1
for Toluene ; p × y2=x2 × p2s ------let this be equation 2
lets add equ 1 and 2
p × y1=x1 × p1s + p × y2=x2 × p2s
p(y1 + y2) = x1 × p1s + x2 × p2s
buy y1 + y2 = 1
therefore we substitute
p(1) = 0.325 × 1.7617 + 0.675 × 0.7195 = 1.0582 Bar
we know that 1 Bar = 750.062 mmHg
so p = 1.0582 × 750.062
p = 793.716 mmHg
Also from equation 1
p × y1=x1 × p1s
y1 = (x1 × p1s) / p
y1 = (0.325 × 1.7617) / 1.0582
y1 = 0.541
Therefore;
Operating Pressure P = 793.716 mmHg
Y_Benzene y1 = 0.541
Air is saturated with water vapor at 35.0 oC and a total pressure of 1.50 atmospheres. If the molar flow rate of the dry air in this stream is 300 mols per minute, what is the molar flow rate of water vapor in the stream?
Answer:
11.541 mol/min
Explanation:
temperature = 35°C
Total pressure = 1.5 * 1.013 * 10^5 = 151.95 kPa
note : partial pressure of water in mixture = saturation pressure of water at T = 35°c )
from steam table it is = 5.6291 Kpa
calculate the mole fraction of H[tex]_{2}o[/tex] ( YH[tex]_{2}o[/tex] )
= 5.6291 / 151.95
= 0.03704
calculate the mole fraction of air ( Yair )
= 1 - mole fraction of water
= 1 - 0.03704 = 0.9629
Now to determine the molar flow rate of water vapor in the stream
lets assume N = Total molar flow rate
NH[tex]_{2}o[/tex] = molar flow rate of water
Nair = molar flow rate of air = 300 moles /min
note : Yair * n = Nair
therefore n = 300 / 0.9629 = 311.541 moles /min
Molar flowrate of water
= n - Nair
= 311.541 - 300 = 11.541 mol/min
A semiconductor wafer with n-type impurities has been stripped from all its free electrons. The wafer is in the form of a flat disk and has positive charges uniformly distributed on its top and bottom surface. The charge density is 10 C/cm^2. Determine the magnitude of the electric flux density D above the wafer in C/m^2.a. 0.5 x10+5 c/m2 b. 0.5x10-5 C/m2 c. 0.5x10 C/m2 d. 10+5 C/m2
Answer:
a. 0.5x10⁵
Explanation:
The charge density = 10C/cm²
We are asked to find the magnitude of the electric flux density
The electric field of infinite sheet
E = σ/2Eo
We have electric density as follows:
D = EEo = EoE
Since charge density σ = 10C/cm²
σ = 10x10²C/m²
D = σ/2
10x10⁴/2
= 5x10⁴C/m²
= 0.5x10⁵C/m²
Therefore the magnitude is equal to 0.5x10⁵C/m². Which gives us option a as the answer
When asked about favorite Thanksgiving leftovers, 9% of the people said turkey and 7100 said mashed potatoes. Which food is more popular? How do you know?
Answer:
how many people were asked though
Explanation:
Determine the expected diffraction angle for the first-order reflection from the (113) set of planes for FCC platinum when monochromatic radiation of wavelength 0.1542 nm is used. The radius for platinum is 0.1387 nm.
Answer:
2Θ = 81.34⁰
Explanation:
We have the plane = 113
The material = fcc platinum
Lambda L, = 0.1542
n = 1
Lambda = 2dsinΘ --------(1)
d = a/√h²+k²+l² -------(2)
We have been given the atomic radius to be
R = 0.1387nm
For FCC we have
a = 2R√2
= 2x0.1387x√2
= 0.3923nm
From the second equation
d111 = 0.3923nm/√1²+1²+3²
= 0.3923/√11
= 0.1183nm
From the first equation
0.1542 = 2x0.1183nmSinΘ
0.1542 = 0.2366sinΘ
SinΘ = 0.1542/0.2366
= 0.6517
Θ = Sin-1(0.6517)
= 40.67
2Θ = 81.34⁰
A circuit contains a resistor, an inductor, and a capacitor. When an AC voltage is applied across the circuit, the impedance of the circuit depends on the _______ of the voltage source.
Answer:
The impedance of the circuit depends on the angular frequency of the voltage source.
Explanation:
In a electric circuit, the magnitude of the impedance, is given by the following expression:[tex]Z = \sqrt{R^{2} + (Xl-Xc)^{2} (1)[/tex]
where R = Resistance
Xl = Inductive reactance = ω*L
Xc = Capacitive Reactance = 1/ωC
and ω = angular frequency of the voltage source.
So, it can be seen that the impedance depends on the value of the constants R,L and C, and on the angular frequency ω.The spiral grooves in a drill body are used to do all of the following except?
How many steps are there in the problem-solving process?
nine steps
six steps
eight steps
seven steps
Answer:
I think 7
Explanation:
Here are seven-steps for an effective problem-solving process.
1.Identify the issues. Be clear about what the problem is. ...
2.Understand everyone's interests. ...
3.List the possible solutions (options) ...
4.Evaluate the options. ...
5.Select an option or options. ...
6.Document the agreement(s). ...
7.Agree on contingencies, monitoring, and evaluation.
What Machine Process is #1
Answer:
The first Machine Process is Turning.
Explanation:plz mark brainliest if i am right
Answer:
I believe its turning.
A student places a piece of a potato into a container of hydrogen peroxide. One observation the student makes is that bubbles form around the potato. The presence of bubbles might indicate the formation of a new substance because bubbles
a - Group of answer choices always rise to the top of a liquid.
b- are almost always perfectly spherical.
c- could show that a gas is forming.
d- usually burst after a few minutes.
1. When measuring a cylinder for wear, the most wear will be found at the
Answer:
Most cylinder wear occurs at the top of ring travel.
In engineering economic analysis, it is permissible to sum dollar amounts without conversion only when __________ .
Answer:
they occur at the same time
Explanation:
What this means is that if let's say on a particular cash record we have two transactions on the same date: For example,
11th/20/2020 received $50 from Jude and received $950 from Paul to pay his credit balance.12th/20/2020Only the two transactions on the 11th are permissible to sum the dollar amounts without conversion.
Does somebody know how to do this?
please I need dhelp asap
What is the shape of an airplane wing called?
air raid
airport
airfoil
Answer:
the answer is airfoil
Explanation:
hope the answer helps
Answer:
It is called the airfoil
Explanation:
The answer is D. ( airfoil) because an airport is a place. Air raid is a attack in the air and that only leaves airfoil, so airfoil is the correct answer.(Hoped that helped)
retaining
Function of
Wall
Answer:
A retaining of a wall is a protective structure, first and foremost.
Explanation:
Its main aim is to provide functional support for keeping soil in place. It acts as a wall to keep the soil on one side and the rest of the landscape area on the other, providing a platform for a garden to be created.
Una barca intenta cruzar un río. La barca lleva una velocidad de 3 m/s con dirección perpendicular a la de la velocidad del agua que es de 4 m/s. Si el ancho del río es de 120 m. El tiempo en llegar a la otra orilla es de:
Answer:
El tiempo que tarda la barca en llegar a la orilla es 40 s.
Explanation:
Debido a que el río se mueve en dirección perpendicular a la barca, ésta se va a mover de manera diagonal, cuya velocidad ([tex]v_{b_{d}}[/tex]) viene dada por:
[tex]|v_{b_{d}}| = \sqrt{v_{r}^{2} + v_{b}^{2}} = \sqrt{(4)^{2} + (3)^{2}} = 5 m/s[/tex]
Por lo tanto, el módulo del vector velocidad diagonal es 5 m/s, y su dirección es:
[tex]tan(\alpha) = \frac{v_{r}}{v_{b}} = \frac{4}{3}[/tex]
Entonces, α es:
[tex] \alpha = arctan(\frac{4}{3}) = 53.13 ^{\circ} [/tex]
Ahora, debemos encontrar la distancia de la longitud diagonal que recorre la barca:
[tex] cos(\alpha) = \frac{a}{d_{d}} [/tex]
[tex] d_{d} = \frac{a}{cos(\alpha)} = \frac{120 m}{cos(53.13)} = 200.0 m [/tex]
Finalmente, el tiempo que le tomaría a la barca recorrer 200 m sería:
[tex]v_{b_{d}} = \frac{d_{d}}{t}[/tex]
[tex] t = \frac{200 m}{5 m/s} = 40 s [/tex]
Por lo tanto, el tiempo que tarda la barca en llegar a la orilla es 40 s.
Espero que te sea de utilidad!
Which of the following justifies the need for an already-certified engineer to continue to take classes?
• Differentiate between laboratory and industrial reactors
Answer:
A reactor is a piece of equipment in which the feedstock is converted to the desired product. Reactors are chosen such that they meet the requirements imposed by the reaction mechanisms, rate expressions, and the required production capacity. Other parameters that must be determined to choose the correct type of reactor are reaction heat, reaction rate constant, heat transfer coefficient, and reactor size. Reactors that are free of the effect of the macro-kinetic properties are classified as: batch isothermal perfectly stirred reactor, batch adiabatic perfectly stirred reactor, semi-batch perfectly stirred reactor, continuous isothermal perfectly stirred reactor flow reactor, continuous adiabatic perfectly stirred flow reactor, continuous isothermal plug flow reactor, and continuous adiabatic plug flow reactor.
How many coordinates are required for a 3-dimensional force?
What is the difference between a cost and a benefit?
Answer:
A cost is something you have to give up or sacrifice and a benefit is something that is gained or is helpful.
Explanation:
In a cost-benefit analysis of a system, an engineer is to simply look at the requirements for the system and determine the costs to build the system, both in financial value and energy value. Additionally, the engineer needs to determine the benefits that would come from choosing a particular path of cost. If the benefits outweigh the cost for the project, then the solution is accepted. Else, the cost outweighs the benefit and the solution is rejected.
16. In a series circuit of three resistors in series with R = 100 2, Rz=5002, and R = 15000 2.
What is the total resistance for the circuit? Show your calculations.
Answer:
15,600 Ω
Explanation:
The total resistance in a series circuit is the sum of the resistances that are in series:
100 Ω + 500 Ω + 15000 Ω = (100 +500 +15000) Ω = 15,600 Ω
Answer:
[tex]15.600 \: ohms[/tex]The total resistance for the Circuit.in series with R= 100 2, Ra = 5002 and R= 15 000 2.How much does 1 gallon of water weigh in pound given that the density of water is 1gram/ cm3
Explanation:
There are 8.35 pounds in a gallon of water. Water weighs 1 gram per cubic centimeter or 1 000 kilogram per cubic meter, i.e. density of water is equal to 1 000 kg/m³; at 25°C (77°F or 298.15K) at standard atmospheric pressure.
An engineer designing a vibration isolation system for an instrument console models the consoleand isolation system as a 1 degree-of-freedom spring-mass-damper system. The modeled mass is 2kg, the spring constant is 8 N/m, and the damping constant is 1 Ns/m. The system is exposed to atime-varying force acting on the mass. This force measured is approximated by:F(t) = 20 sin(4t) [N]. Determine the steady-state response of the system to this input.
Solution :
Given :
m = 2 kg
k = 8 N/m
C= 1 N-s/m
F(t) = 20 sin (4t)
[tex]$F_0= 20 \ N$[/tex]
ω = 4 rad/s
[tex]$\omega_n = \sqrt{\frac{k}{m}}$[/tex]
[tex]$\omega_n = \sqrt{\frac{8}{2}}$[/tex]
= 2 rad/s
Therefore,
[tex]$\epsilon = \frac{C}{2 m \omega_n}$[/tex]
[tex]$\epsilon = \frac{1}{2 \times 2 \times 2}$[/tex]
= [tex]$\frac{1}{8}$[/tex]
= 0.125
So, r = [tex]$\frac{\omega}{\omega_n}$[/tex]
= [tex]$\frac{4}{2}$[/tex]
= 2
Steady state response is given by
[tex]$(A)=\frac{F_0 / k}{\sqrt{(1-r^r)^2+(2 \epsilon r)^r}}$[/tex]
[tex]$(A)=\frac{20 / 8}{\sqrt{(1-2^r)^2+(2 \times 0.125 \times 2)^r}}$[/tex]
A = 0.82 m
