The answers are:
(a) Humidity = 0.0228 kg H2O/kg air
(b) Saturation humidity = 0.0432 kg H2O/kg air, Percentage humidity = 52.8%
(c) Percentage relative humidity = 54.4%
How did we arrive at these values?To solve this problem, use the psychrometric chart for air. The psychrometric chart provides a graphical representation of the thermodynamic properties of moist air.
(a) Humidity:
Applying the psychrometric chart, determine the specific humidity of the air at 37.8°C and a partial pressure of water vapor of 3.59 kPa.
Locating the point on the chart where the dry bulb temperature is 37.8°C and the partial pressure of water vapor is 3.59 kPa, it is found that the specific humidity is approximately 0.0228 kg H2O/kg air.
Therefore, the humidity is 0.0228 kg H2O/kg air.
(b) Saturation humidity and percentage humidity:
The saturation humidity is the maximum amount of water vapor that the air can hold at a given temperature and pressure. Using the psychrometric chart, determine the saturation humidity at 37.8°C and a total pressure of 101.3 kPa.
Locating the point on the chart where the dry bulb temperature is 37.8°C and the total pressure is 101.3 kPa, it is found that the saturation humidity is approximately 0.0432 kg H2O/kg air.
The percentage humidity is the ratio of the actual humidity to the saturation humidity, expressed as a percentage. Therefore, the percentage humidity is:
percentage humidity = (humidity/saturation humidity) x 100%
= (0.0228/0.0432) x 100%
= 52.8%
(c) Percentage relative humidity:
The percentage relative humidity is the ratio of the partial pressure of water vapor in the air to the saturation pressure of water vapor at the same temperature, expressed as a percentage. Applying the psychrometric chart, determine the saturation pressure of water vapor at 37.8°C.
Locating the point on the chart where the dry bulb temperature is 37.8°C and the total pressure is 101.3 kPa, we find that the saturation pressure of water vapor is approximately 6.33 kPa.
Therefore, the percentage relative humidity is:
percentage relative humidity = (pa/saturation pressure) x 100%
= (3.59/6.33) x 100%
= 56.6%
Therefore, the answers are:
(a) Humidity = 0.0228 kg H2O/kg air
(b) Saturation humidity = 0.0432 kg H2O/kg air, Percentage humidity = 52.8%
(c) Percentage relative humidity = 54.4%
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To put out a class D metal fire, you must _______ the fire.
To put out a class D metal fire, you must smother the fire and eliminate the oxygen element in the fire.
What is a Class D fire?A class D fire is a type of fire that cannot be extinguished by water. This is because adding water to it reacts with other elements in the fire intensifying the fire even more.
Smothering in this context involves adding a solution like carbon dioxide (CO2) into the fire, this results in a reduction of oxygen in the atmosphere surrounding the class D fire.
By so doing, smothering the fire eliminates the oxygen element in the fire, thereby extinguishing the fire.
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Determine the carburizing time necessary to achieve a carbon concentration of 0.30 wt.% at a position of 4 mm into an iron-carbon alloy that initially contains 0.10 wt.% C. The surface concentration is to be maintained at 0.90 wt.% C, and the treatment is to be conducted at C. Use the diffusion data for -Fe in Table 5.2
The carburizing time necessary to achieve a carbon concentration is 31.35 hours
How to find the Carburizing Time?To determine the carburizing time necessary to achieve the given carbon concentration, we will use the equation:
(Cs - Cx)/(Cs - C0) = ERF(x/2√Dt)
where;
Cs is Concentration of carbon at surface = 0.90
Cx is Concentration of carbon at distance x = 0.30
Distance x = 4 mm = 0.004 m
C0 is Initial concentration of carbon = 0.10
ERF() = Error function at the given value
D = Diffusion of Carbon into steel
t = Time necessary to achieve given carbon concentration ,
Thus, plugging in the relevant values gives;
(Cs - Cx)/(Cs - C0) = (0.9 - 0.3)/(0.9 - 0.1)
= 0.6/0.8 = 0.75
now, ERF(z) = 0.75 and as such using ERF table, we can say that;
Z = 0.814. Thus;
(x/2√Dt) = 0.81
Using the table of diffusion data, we have;
At a temperature of (1100°C) or 1373 K, we have;
D = 5.35 × 10⁻¹¹ m²/sec.
Calculating the carbonizing time by using the equation z = (x/2√Dt);
where;
t is carbonizing time
Thus;
0.814 = (0.004/(2 × √5.35 × 10⁻¹¹ × √t))
0.814 = 0.004 /(1.4628 × 10⁻⁵ × √t)
0.814 × 1.4628 × 10⁻⁵ × √t = 0.004
1.19072 × 10⁻⁵ × √t = 0.004
√t = 0.004/(1.19072 × 10⁻⁵)
√t = 335.93
t = 112848.96 seconds
Converting to hours gives;
t = 112848.96/3600
t = 31.35 hours
Therefore, the carburizing time necessary to achieve a carbon concentration is 31.35 hours
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based on the graph shown, for any given output level, the veritcal distance between the avc and the atc curves represents
A a result of the graph shown, for any given output level, the veritcal distance between the avc and the atc curves represents total fixed cost (TFC).
What is Vertical distance?This is known as vertical separation and it is said to be the distance that exist between two vertical positions.
Note that vertical coordinates are seen for expressing vertical position: depth, and others and as such,
See full question below
The vertical distance between the ATC and AVC curve represents
a) marginal cost (MC)
b) average fixed cost (AFC)
c) total fixed cost (TFC)
d) total cost (TC) - total variable cost (TVC)
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Structural Safety Assessment and Traffic Control Strategies of Widened Highway Bridges under Maintenance Works Requiring Partial Lane Closure
Structural Safety Assessment and Traffic Control Strategies of Widened Highway Bridges under Maintenance Works Requiring Partial Lane Closure journal is based on the way and techniques that can be used in maintaining the Safety on the road as well as the Assessment of Traffic Control.
What are the techniques in controlling the traffic?
There are Devices that are typically used in the traffic control, and this can include speed bumps as well as the barricades to block streets.
Others techniques are:
turn prohibitions stop signs raised pavement markers.Traffic restraint can also entails the includes programs that can foster bicycle as well as the pedestrian travel.
The rapid structural safety assessment help in inspecting and evaluating the concrete structure as well in determining the damaged structure if it is unsafe for personnel within the building .
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Modern aircraft are designed in a way that, when all seats are occupied, the baggage compartment is full, and all fuel tanks are full, the aircraft is:
Modern aircraft are designed in a way that, when all seats are occupied and baggage is full, and all fuel tanks are full, the aircraft is overloaded.
What is aircraft storage?Aircraft storage refers to all storage systems in an aircraft for human transportation and also to transport products among countries.
The aircraft storage system is well calculated to work is a maximum capacity in commercial fly lines.
In conclusion, modern aircraft are designed in a way that, when all seats are occupied and baggage is full, and all fuel tanks are full, the aircraft is overloaded.
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If extension done in a stork position, during backward bending in a standing position of a special test for lumbar spine, produces pain in the lumbar or sacral regions of the spine, it may indicate _____.
How are new slip rings attached to the rotor core during alternator rebuilding?
The new slip rings is been attached to the rotor core during alternator rebuilding by b. Soldered on.
What is the process of Soldering ?Soldering is the use of Solder which is a metal alloy consisting tin and lead and is the way of joining different types of metals together by melting solder.
This is been used on new slip rings to get it attached to the rotor core during alternator rebuilding .
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CHECK THE COMPLETE QUESTION BELOW:
How are new slip rings attached to the rotor core during alternator rebuilding?
a. Machine clamped
b. Soldered on
c. Crimped on
d. epoxy glue
Which load balancing method is supported in equal cost multipath (ECMP) load balancing when SD-WAN is enabled
Volume load balancing method is supported in equal cost multipath (ECMP) load balancing when SD-WAN is enabled.
What is load balancing method?Load balancing means are regarded as a form of an algorithms or method that is used to rightly share an incoming server request or traffic in the midst or among servers that is from the server pool.
Note that Volume load balancing method is supported in equal cost multipath (ECMP) load balancing when SD-WAN is enabled as that is its role.
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The only difference between all GMA welding machines and some FCA welding machines is that all GMA welding machines must have a ______________.
Answer: Shielding gas solenoid
Explanation:
Soru No 3
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Someone claims that the volume flow rate in a circular pipe with laminar flow can be determined by measuring the velocity at the centerline in the fully developed region, multiplying it by the cross-sectional area, and dividing the result by 2. Do you agree
Vivian's Violins has sales of $326,000, contribution margin of $184,000 and fixed costs total $85,000. Vivian's Violins net operating income is Blank______. Multiple choice question. $241,000 $57,000 $99,000
Based on the calculations, Vivian's Violins net operating income is equal to: D. $99,000.
How to calculate net operating income?Mathematically, the net operating income of an individual or business firm can be calculated by using this formula:
Net operating income = Contribution margin - Total fixed costs
Given the following data:
Sales = $326,000Contribution margin = $184,000Fixed costs total $85,000Substituting the given parameters into the formula, we have;
Net operating income = $184,000 - $85,000
Net operating income = $99,000.
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A light weight vehicle traveling 50 mph can stop in approximately
a. 200 meters.
b. 5 blocks.
c. 200 feet.
d. 6 seconds.
A light weight vehicle traveling 50 mph can stop in approximately 200 feet.
How a car break works?
The break system of a car is composed by several items that are always working together to slow down and bring a vehicle to a complete stop. It also has the function of keeping the car stationary when it is parked. In general, this system has two manual activation modes: the lever and the pedal, with the exception of vehicles adapted for people with disabilities.
Most vehicles today use the disc brake system. Disc brakes work by using pads, which are held inside a hydraulic caliper, receiving pressure to brake. Such pads generate friction on a disc, which makes the vehicle stop permanently.
The drum brake is another type, being older and dependent on the famous linings to cause friction in the wheel and stop the vehicle. A hydraulic cylinder makes the plies move inside the drum, which is a hollow part fastened with screws and attached to the wheels. This type of brake is on the rear wheels, for the most common models.
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a. Calculate the equivalent resistance of the circuit
Answer:
no any think photo.
Explanation:
An important difference between expressways and freeways is that expressways feature intersections, whereas freeways use: a) interchanges b) medians c) rumble strips d) green guide signs
An important difference between expressways and freeways is that expressways feature intersections, whereas freeways use a) interchanges.
A handsfree device may be used if it can be activated or deactivate with a?
A handsfree device may be used if it can be activated or deactivate with a cellphone.
What is hands-free?Handsfree is a device which when connected to a cell device can be used in listening to audio, video and messages.
A driver can also activate or deactivate with a swipe when connect to the vehicle audio device.
Therefore,
A handsfree device may be used if it can be activated or deactivate with a cellphone.
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Write a class having two private variables and one-member function which will return the area of the rectangle.
Using the knowledge in computational language in C++ it is possible to write the code being write a class having two private variables
Writting the code in C++:#include <iostream>
using namespace std;
class Rectangle { /*create a class named Rectangle*/
private:
float l,b; /*this class has two private variables l and b*/
public:
float getArea(float l, float b) /*this class has one member-function getArea which returns the area of the rectangle*/
{
return l*b; /*return the area of the rectangle*/
}
};
int main () { /*the main function to check the working of our Rectangle class*/
float l,b;
Rectangle r1; /*create an object r1 of Rectangle class*/
cout<<"Enter the length of the rectangle: ";
cin>>l; /*input the length of the rectangle from the user*/
cout<<"Enter the breadth of the rectangle: ";
cin>>b; /*input the breadth of the rectangle from the user*/
cout <<"Area of the rectangle is: "<< r1.getArea(l,b)<<" square units."; /*find the area of the rectangle using the member function of the class*/
return 0;
}
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When converting liquid level units to sensor output signal units, you should first convert the liquid level units to _____ units
When converting liquid-level units to sensor output signal units, you should first convert the liquid-level units to engineering units.
The engineering units are the actual physical measurements of the liquid level, such as meters, feet, inches, or any other relevant unit of length or depth.
Once the liquid level is expressed in engineering units, you can then proceed with the conversion to the sensor output signal units, which typically involves scaling the engineering units to match the range and sensitivity of the sensor's output.
This ensures that the sensor provides an accurate and meaningful representation of the liquid level, making it easier to interpret and use the data for various applications.
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The advantage of using a reference line to position a building is that
Answer:
The reference line helps you achieve the precise connection of Walls for clean intersections.
Explanation:
Reference Lines allow you to place lines on the plot at specific locations to mark important values. You could use these to mark control limits or to indicate a trend line for a set of data.
What is the mode of operation of a ramp digital voltimeter
Answer:
The operating principle of a ramp type digital voltmeter is to measure the time that a linear ramp voltage takes to change from level of input voltage to zero voltage (or vice versa).
In 2001, a land-development company launched an engineering project on land adjacent to a protected wetlands area
The statement that summarizes the data is that the population data should be collected over a much lingers period of time in order to draw a valid conclusion.
What is data?It should be noted that data simply means the facts or statistics that are put together to get more information about a particular issue.
It should be noted that a project simony refers to an individual or collaborative enterprise which is planned in order to achieve a particular aim. In this case, the land-development company launched an engineering project on land adjacent to a protected wetlands area.
It should be noted that the time frame that the data was collected matters a lot in order to get a valid conclusion.
In this case, the statement that summarizes the data is that the population data should be collected over a much lingers period of time in order to draw a valid conclusion.
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The options to the question:
a. The data Gail to represent a broad diversity of species and so do not provide enough information to adequately draw a conclusion.
b. Population data were not sampled frequently enough to draw a valid conclusion.
c. The data show stable population trends in native species providing evidence that the engineering project has no negative impact on the ecosystem.
d. The population data should be collected over a much lingers period of time in order to draw a valid conclusion.
Through Engineering, human achievement continues to advance. Write about your favorite example of engineering in action and what impresses you about it from an Engineering standpoint.
Hydroelectric power plants are outstanding engineering devices that allow people to obtain energy from renewable sources.
What is a hydroelectric power plant?A hydroelectric power plant is a center for the production of electricity based on hydropower energy systems.
Hydroelectric power plants exploit the energy of water masses (e.g., a stream) to produce clean energy for million of people around the world.
These plants have generators capable of converting mechanical energy into electricity by using simple turbines.
In conclusion, hydroelectric power plants are outstanding engineering devices that allow people to obtain energy from renewable sources.
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Technician A says that a voltage drop on the ground side of a bulb won’t affect its brightness because the electricity has already been used up. Technician B says that a voltage drop is one way to determine if there is unwanted resistance in a circuit. Who is correct?
Answer:
Technician B
Explanation:
For a given circuit current, the voltage drop is an indication of the resistance in the circuit.
If the voltage drop on the ground side of a bulb is unexpectedly high, it means the circuit resistance is unexpectedly high. Technician B is correct.
An isolation transformer whose main purpose is to reduce voltage spikes will have a turns ratio of?
Answer:
An isolation transformer whose main purpose is to reduce voltage spikes will have a turns ratio of 1 to 1.
This is due to the windings input and output having the same waveform and amplitude.
When passing another car, make sure you maintain at least a _______ safety cushion
what is the basic concept of the finite element method.
Answer:
The FEM is a general numerical method for solving partial differential equations in two or three space variables (i.e., some boundary value problems). To solve a problem, the FEM subdivides a large system into smaller, simpler parts that are called finite elements.
Metal wireways are sheet metal troughs with _____________ for housing and protecting electrical conductors and cable.
Answer:
Metal wireways are sheet metal "U"s with removable housing for protecting electrical equipment, wires, and cables.
Explanation:
These are especially used to run wire in manufacturing environments.
The lights on your vehicle must be turned on at any time, day or night, when persons and vehicles cannot be clearly seen for ___ feet.
Answer:
500 feetExplanation:
In order to stop or turn your vehicle around on the highway you must have 500 feet of clear road in both directions. 4. Headlights are required at any time you cannot see persons or vehicles for 500 feet, due to snow, dust, fog, etc. and from ½ after sunset to ½ before sunrise.Hope this helpsThe lights on your vehicle must be turned on at any time, day or night, when persons and vehicles cannot be clearly seen for 1000 feet.
What are vehicles?A vehicle is a piece of equipment, typically with wheels and an engine, used for land-based transportation of people or goods. Cars, buses, and trucks are examples of road vehicles. Farm vehicles include tractors.
Vehicle type refers to a group of power-driven vehicles that share all crucial aspects of their engines, cars, and OBD systems.
When a vehicle is 500 feet away, the driver must dim his headlights.
Avoid looking directly into the light when a car is coming at you; instead, slow down. At least 30 minutes before dusk, headlights must be activated. It is also important to keep in mind that a lower headlight beam improves the driver's ability to see in fog.
Thus, it should be 1000 feet distance.
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Manual transmission has a driver-operated clutch and a movable gear selector. In manual transmission, the gears are engaged .....................
In the case above about manual transmission, the gears are engaged manually.
What is manual transmission?The Definition of the term manual transmission is regarded as a kind of a system where there is the changing gears in a manual way.
Hence, In the case above about manual transmission, the gears are engaged manually is correct.
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Which is not one of the primary characteristic of unit testing:
Answer:
Unit testing is a software development process in which the smallest testable parts of an application, called units, are individually and independently scrutinized for proper operation. This testing methodology is done during the development process by the software developers and sometimes QA staff. The main objective of unit testing is to isolate written code to test and determine if it works as intended.
Unit testing is an important step in the development process, because if done correctly, it can help detect early flaws in code which may be more difficult to find in later testing stages.
Unit testing is a component of test-driven development (TDD), a pragmatic methodology that takes a meticulous approach to building a product by means of continual testing and revision. This testing method is also the first level of software testing, which is performed before other testing methods such as integration testing. Unit tests are typically isolated to ensure a unit does not rely on any external code or functions. Testing can be done manually but is often automated. It might be helpful