A step which is usually performed by a scientist even though it is not considered a formal step in the scientific method is: D. withhold findings.
The steps of a scientific method.In Science, an effective and efficient way to follow the scientific method during a research work include the following:
Make observations.Ask questions.Construct a hypothesis.Test the hypothesis with an investigation.Analyze the data.Explain the result.Communicate the result.In conclusion, some scientist are guilty of withholding their findings even though it is not considered as being a formal step in the scientific method.
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a sinusoidal voltage source of v(t) 170 cos (2 60t) v is applied to a nonlinear load, resulting in a nonsinusoidal current that is expressed in fourier series form as i(t) 10 cos (2 60t 30 ) 6 cos (4 60t 45 ) 3 cos (8 60t 20 ) a. determine (a) the power absorbed by the load, (b) the power factor of the load, (c) the distortion factor, and (d) the total harmonic distortion of the load current.
The power factor in a circuit or distribution system is the ratio of actual power to apparent power. Real, reactive, harmonic, and apparent (total) power all exist in an AC circuit.
True power is the amount of energy, measured in W or kW, that motors, lights, and other appliances use to create useful work. Reactive power is the power that inductors and capacitors store and release, measured in VAR or kVAR. A phase difference between the waveforms of the current and voltage indicates the presence of reactive power. Harmonic power, measured in VA or kVA, is the power lost due to harmonic distortion. The vector sum of real power, reactive power, and harmonic power is known as apparent power, and it is measured in VA or kVA. Evident power is a vector summation rather than a straightforward addition.
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technician a says that the higher the gear selected the more torque is available. technician b says that a transaxle contains gears that increase or decrease torque. who is correct?
Technician A is correct. Technician B is wrong because a gear's transmission is used to increase or decrease torque.
The relation torque is relying on multiplying the circumferential detail with the resource of the usage of the radius; massive gears experience a greater amount of torque, at the same time as smaller gears experience a great deal much less torque. Similarly, the torque ratio is equal to the ratio of the gears' radii. A gear's transmission torque modifications as it will boom or decreases speed. Commonly, with the resource of the usage of lowering the speed, a small torque on the doorway issue is transferred as a massive torque at the output issue. The calculation of torque is quantified with the resource of the usage of an extensive form of teeth.
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two technicians are discussing drum brake shoes. technician a says that forward and rearward facing shoes are the same and can be installed in either position on any drum brake system. technician b says that the longer linings should always be placed toward the front of the vehicle which technician is correct?
Both technicians are wrong.
Drum Brakes :
Drum brakes generate consistent braking force whether the vehicle travels forward or backward. Drum brakes produce the same amount of braking force in both directions, which explains this. This kind is typically utilised for the passenger car's rear brakes. Drum brakes have brake drums that rotate with the wheels. A drum braking system includes brake shoes. The crescent-shaped brake shoes have a rough friction surface on one side. They are contained within a brake drum. The brake shoes are thrust outward when the brake pedal is depressed, pressing on the brake drum's interior and slowing the wheel.
Although disc brakes are the more reliable and efficient option, they are not without drawbacks. Although they are not very practical, drum brakes are necessary for parking a car—unless, of course, you want to return to the days of wooden blocks on sticks. As a result, modern cars frequently still have drum brakes.
A drum braking system includes brake shoes. The crescent-shaped brake shoes have a rough friction surface on one side. They are contained within a brake drum. The brake shoes are thrust outward when the brake pedal is depressed, pressing on the brake drum's interior and slowing the wheel. Drum brakes and brake shoes are vintage braking system components that are becoming less frequent on contemporary cars. However, because drum brakes are less expensive to manufacture, some car models will have them on the back wheels.
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Technician A is wrong and Technician B words that drum brake shoes need to be cleaned and reused when lining is stained with gear oil or grease is correct.
What is drum brake shoes?A drum braking system includes brake shoes. The crescent-shaped brake shoes have a rough friction surface on one side. They are contained within a brake drum. The brake shoes are thrust outward when the brake pedal is depressed, pressing on the brake drum's interior and slowing the wheel. Each drum contains brake shoes with brake linings (friction material). To provide braking force and enable the vehicle to slow down and stop, pistons (a pressure mechanism) press against the drums from the inside. With the right care and maintenance, drum brakes can typically be expected to last between 150,000 and 200,000 miles. They typically require new brake shoes every 30,000 to 40,000 miles.
Technician A is wrong and Technician B words that drum brake shoes need to be cleaned and reused when lining is stained with gear oil or grease is correct.
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Assembly Drawings: a set of working drawings used in ___________________ that depict complete details of all components.
1. production
2. engineering
3.concocting
Specifications: detailed description or assessment of ________________, dimensions, materials of a proposed product.
1. necessities
2.constraints
3. requirements
Ideate: the process of ____________________ an idea, a thought, or an image
1. forming
2. developing
3. producing
Quantitative: the process of ___________________ or describing by quantity
1. estimating
2. rating
3. appraising
an aluminum rod needs to withstand an applied force of 45,000 pounds. the engineering stress-strain curve for the aluminum alloy is show below. to ensure safety, the maximum allowable stress is limited to 25,000 psi, which is below the yield strength of aluminum. the rod is 150 in long and must deform elastically no more than 0.25 in when the force is applied. what is the minimum diameter (in inches) of the rod with a round cross section?
The minimum diameter (in inches) of the rod with a round cross section is 1.3541 in.
What do you mean by diameter?
A diameter of a circle is any straight line segment which passes through the centre of the circle and has endpoints on the circle in geometry. It is also known as the circle's longest chord. Both definitions apply to the diameter of a sphere.
Maximum allowable strers = 25,000psi
Length= 150 in
deform= 0.25 in
Strain= Δl/L = 0.25/150
Strain = 1·666X10⁻³
Stresr/ Strain = modulus of Elasticity
Stresr= 1.6666×10⁻³ ×10000×10³
Stresr= 16666 PSi
Stresr= force/area
Area= 45000/16666
Area= 2.700 in²
Area= π/4 D²
2070= π/4 D²
D= 1.3541 in
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in large compressors, the gas is often cooled while being compressed to reduce the power consumed by the compressor. explain how cooling the gas during a compression process reduces the power consumption.
The way cooling the gas during a compression process reduces power consumption can be done by steady flow devices.
Cooling the compressor coils lower the bloodless sink temperature of the thermodynamic cycle that the gadget operates on. This complements performance with the aid of using improving the distinction between the temperature of the warmth supply and that of the bloodless sink. Since compression generates heat, the compressed gas desires to be cooled among stages, making the compression much less adiabatic and more isothermal. When intermediate cooling is determined out of the gas at some stage in compression then it decreases gas-unique quantity as a result electricity intake of the compressor is lower.
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Give the procedures on conducting technical drafting
The procedure for technical drafting is summarized below:
Proper Sheet Preparation; This entails choosing the drawing sheet. Drawing paper is used for the short term and polyester film for the long term. Secure the Drawing Sheet to the Board by first aligning it with the T-square blade.Execute Sheet Layout: This involves the process of inserting the border and the title block on the drawing sheet.Create reference Zone: These can be found the in the margins and are useful for finding key information about the drawing.Technical drawing, often known as drafting or drawing, is the act and practice of creating drawings that graphically convey how something works or is built. In industry and engineering, technical sketching is critical for expressing ideas.
A technical drawing, also known as an engineering drawing, is a thorough, accurate diagram or blueprint that provides information about how an object works or is built. These drawings are used as guidelines by engineers, electricians, and contractors while constructing or repairing things and buildings.
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two steels are being considered for manufacture of as-forged connecting rods. one is aisi 4340 cr-mo-ni steel capable of being heat-treated to a tensile strength of 260 kpsi. the other is a plain carbon steel aisi 1040 with an sut of 113 kpsi. if each rod is to have a size giving an equivalent diameter de of 0.75 in., is there any advantage to using the alloy steel for this fatigue application?
The most typical material used to create pipes is alloy steel, particularly pipes for energy-related uses. Additionally, it is utilized in the production of corrosion-resistant containers, silverware, pots and pans, and heating elements for appliances like toasters.
Alloy steels can generally show more strength, ductility, and toughness than carbon steels. However, alloy steels often have lower machinability, weldability, and formability, which is a drawback. One metal and one nonmetal are combined to boost the hardness of metal. In comparison to their component constituents, alloys have a higher tensile strength. Metal alloys are combinations of various metals that keep the desired qualities while getting rid of the undesired ones. Many industries use alloys extensively. They are employed in the manufacture of military, industrial, medical, and aerospace equipment.
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technician a says that when a charged battery's electrolyte is low it should be topped up with distilled water. technician b says that the battery should be topped up with a mixture of acid and water. who is correct?
According to the question of electrolytes, technician A is correct.
What is an electrolyte?
An electrolyte is a material containing ions that conducts electricity through the movement of those ions but does not conduct electrons. Most soluble salts, acids, and bases dissolved in a polar solvent, such as water, fall into this category. When the substance dissolves, it splits into cations and anions, which spread uniformly throughout the solvent. The term electrolyte refers to the substance that is dissolved in medicine and sometimes in chemistry. Such a solution is electrically neutral. When an electric potential is introduced to such a solution, the cations are pulled to the electrode with the most electrons, while the anions are drawn to the electrode with the least electrons.
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Vehicle C is about to begin backing into the parking stall.
How much distance should there be between vehicle C and
the vehicle on its right?
3 feet should be there between vehicle C and the vehicle on its right.
What is a vehicle?
A vehicle is a machine used to transport people or goods. Wagons, bicycles, motor vehicles (motorcycles, cars, trucks, buses, disabled mobility scooters), railed vehicles (trains, trams), watercraft (ships, boats, underwater vehicles), amphibious vehicles (screw-propelled vehicles, hovercraft), aircraft (aeroplanes, helicopters, aerostats), and spacecraft are examples of vehicles. Land vehicles are broadly classified based on how they apply steering and drive forces to the ground: wheeled, tracked, railed, or skied. ISO 3833-1977 is the standard for road vehicle types, terms, and definitions, which is also used in international legislation. Over one billion bicycles are in use worldwide. There were an estimated 590 million cars and 205 million motorcycles in service worldwide in 2002.
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Describe the purpose of the SPST 12 volt DC master switch
The SPST 12-volt DC master switch is used to turn on and off the power to a device.
What is device?
A device is a physical piece of hardware or software that performs one or more computational functions within a computer system. It can either offer input to the computer or accept output from it. A device is any electronic element that has some computational capability and can install firmware or third-party software. A computer mouse, speakers, printer, and microphone are examples of common hardware. A device is sometimes known as an appliance, gadget, or electronic instrument.
The purpose of the SPST 12 volt DC master switch is to provide a way to turn on and off the power to a device. This switch is typically used to control the power to a lights or other electrical devices.
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n air conditioning system operating on the reversed carnot cycle is required to transfer heat from a house at a rate of 750 kj/min to maintain its temperature at 24 c. if the outdoor air temperature is 35 c, determine the power required to operate this air conditioning system. answer: 0.463 kw. additional: if the heat rejected to the outside air is used to provide hot water, at what volume rate could hot water at 30 c be produced for domestic use? assume the initial temperature of the water is 20 c.
The power needed to run this air conditioning system is 0.466 KW. an ideal closed thermodynamic cycle that is reversible in which the working substance undergoes four isothermal expansion processes in succession.
Step 1: Information is provided
The house's heat transfer rate is 755 kJ/min (Ql).
Temperature inside the home = Th = 24°C = 24 +273 = 297 Kelvin
Temperature outside is 35 °C, which is equivalent to 35 + 273 Kelvin.
Step 2: Determine the performance coefficient of a reversed carnot air conditioner operating within the given temperature ranges.
COPr,c = ((To/Th) - 1) / 1)
COPr,c = 1 /((308/297) - 1)
COPr,c = 1/ 0.037
COPr,c = 27
Step 3: The power input can be provided as described below:
Ql / COPr,max = Wnet,in
= 755 / 27 Wnet, in
Wnet,in equals 27,963 kJ/min
Win is equal to 27.963 * 1 KW/60 kJ/min, or 0.466 KW.
The power needed to run this air conditioning system is 0.466 KW.
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technician a says a voltage drop of 1.2 volts on a window switch means the switch is faulty. technician b says you could use a jumper wire to bypass the switch and determine if the window motor functions properly before just replacing the switch. who is correct?
Only technician b is correct who states that before replacing the window switch it is better to use a jumper wire to bypass the switch in order to determine if the window motor operates properly.
A jumper wire is simply an electrical wire with connector pins at each side. The jumper wire is used to bypass a switch that is suspected to be faulty so that problem can be diagnosed. Such as in the case of the scenario given in the question statement . A jumper wire can be used to bypass the suspected switch in the window motor in order to find out if the switch is faulty or not.
Hence, technician b is correct who recommends the use of a jumper wire to bypass the switch before replacing the switch of the window motor so as to determine if the window motor resumes proper functioning. However, technician a is not correct because for the window switch a voltage drop of up to 3% is acceptable.
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an alternator has zero output. technician a says that the alternator field circuit may have an open circuit. technician b says that the fusible link may be open in the alternator to battery wire. which technician is correct?
Option a is correct.
Fusible link is used to absorb the overload current passing through the circuit to avoid damages to the circuit. In this case if the fusible link is open, the overload current may have reached and due to which the circuit has been damaged but given that the output is zero which means no current is flowing through the circuit.
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technician a says dotted lines between switch wipers indicate that all wipers will move together. technician b says dotted lines around a component indicates the it is part of the component. who is correct?
It is to be noted that where Technician A says dotted lines between switch wipers indicate that all wipers will move together and Technician B says dotted lines around a component indicate that it is part of the component, the correct technician is Technician A.
What are Switch Wipers?A wiper switch is a mechanism that controls the speed and operation of your windshield wipers. It makes it simple to clear your windshield, allowing you to maintain an unobstructed view of the road.
Switch Wiper is also known as a combo switch, a dip beam switch, or a directional/wiper switch. When adjusted up or down, the left-hand stalk indicates and cancels turn signs.
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please hurry!!!! which of the statements below is true a 12 awg conductor with THHN insulation has a greater resistance per foot that a 12 awg conductor with thw insulation a 8 awg conductor has a greater resistance per foot than a 6 awg conductorthe resistance per foot of a 14 awg conductor is the same as that of a 10 awg conductor
Answer:
a 8 awg conductor has a higher resistance that a 6 awg conductor
Explanation:
when it comes to wires remeber the thinner the wire (higger gauge) the more resistance.
The statement which is true is as follows:
An 8 AWG conductor has a greater resistance per foot than a 6 AWG conductor.Thus, the correct option for this question is C.
What is meant by Resistance?In physics, resistance may be characterized as a measure of the opposition to current flow in an electrical circuit. It is measured in ohms. The symbol of its representation is Ω.
According to the context of this question, it is a principle in physics that the thinner the wire, the more resistance. This is because it suffers more from environmental conditions like high temperatures, etc.
So, an 8 AWG wire is thinner than a 6 AWG wire. As a result of this, ut exhibit more resistance.
Therefore, an 8 AWG conductor has a greater resistance per foot than a 6 AWG conductor is the statement that is true. Thus, the correct option for this question is C.
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What can your employer do to protect you from overhead power lines
Answer: maintain a safe distance from lines when working.
Explanation:
Have the power company de-energize and ground the power lines.
wearing ppe is the only way to prevent being electrocuted.
have the power company install insulated sleeves (also known as “eels”) over power lines.
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the installed transformer has burned out. it is found that the replacement transformer needs a higher va rating. how can you obtain a higher va rating?
Answer:
Explanation:
When a transformer burn out, It makes a great miss in the location, the team work has to work hard to return the power back to.
There are different factors that can cause a transformer to burn. Here we will discuss some common reasons responsible for transformer burning. But, What is meant by transformer burning? It means that the transformer actually burns out and can catch fire too, when its temperature rises to extreme level with out no cooling.
Oil Leakage
As we discussed the importance of oil in the transformer in our previous article, Similarly, oil leak is one of the main reasons that can cause transformer to burn. Oil main functions are insulation and cooling.
When the oil level falls from the standard level, the winding gets hot, and as a result the transformer temperature increases and causes burning. If the oil overheats it can also cause an explosion in the transformer.
Natural Aging
Like all other working equipment, aging is one of the failure factors. However, with a good maintenance program and well trained workers the age of the equipment can be extended. While the same equipment with no or poor maintenance makes its lifetime shorter. Transformers are not an exception, Natural aging is another reason of transformer burning. Transformer consist of Silicon coated paint having a small value of insulation resistance. Due to natural aging, the insulation resistance cannot withstand for a long time, and eddy current losses occur which causes damages to the transformer.
Also, with the factor of age, side by side to the environmental effects, the oil tank of the transformer is getting damaged due to corrosion. By this way the oil may leak and the transformer temperature rises and then, the transformer burn out.
How To Protect Transformer From Burn Out?
A good and regular maintenance program, side by side to the main protection installation from day one of transformer working are the key of protecting the transformer, Protection devices like Circuit breaker, fuses and advanced protection relays are the combination of protection system. These protection devices detect any fault before it become a serious problem and lead to burning the transformer.
We had a transformer of 2.5 MVA in the work which completely burnt out when the protection devices failed to discover and isolate the fault. The main reason was an external short circuit. The large current damaged the winding.
The following precautions need to be taken in order to protect transformer from burnout.
Regular check the transformer cooling system to make effective cooling. Check fans and oil pumps. Also check the radiator for any air blockage and make sure it is always clean.
Properly check the oil level in the transformer tank. For this purpose, monthly inspection needs to be carried out. This is why its important to have a preventive maintenance schedule.
Repair leaks, if any exist. Methods of leakage repair is i details in my other article here.
Use painting and other weather-resistive material to protect the transformer tank from aging and corrosion.
Install watchdog breakers to protect against power failure and overcurrent faults.
Make sure that protection devices and fuses are designed properly to protect this transformer.
Installing lightning arrestors can also protect transformers from burning and explosions. As it protects the transformer from lightning.
Avoiding insulation resistance, internal arcing, and reducing flashover current also help to protect transformers.
Using partial discharge devices to monitor the PD activity and detect it early before turning into an explosion.
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technician a says that a poor engine ground connection can cause electricity to flow through wheel bearings, causing damage. technician b says that overloading may result in premature bearing failure. which technician is correct?
Technician a is correct.
Poor grounding causes serious damages. If the grounding is not done properly the current will find a path and will start flowing where the resistance will be low and thus it can create damage.
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steel wire, 3.2 m long, has a diameter of 1.2 mm. the wire stretches 1.6 mm when it bears a load. young's modulus for steel is . the mass of the load is closest to:
The young's modulus for steel is 2.83k x 10⁶ Pa.
We need to know about Hooke's Law to solve this problem. Hooke's Law describes the force applied to spring (elastic materials) will proportional to the spring constant and displacement under the elastic condition. It can be described as
F = k . ΔL
where F is force, k is spring constant and ΔL is displacement.
As we know that the modulus of young can represent the elasticity of the material. The young modulus can be written as
Y = σ / ε
where Y is young's modulus, σ is stress and ε is strain.
From the question above, we know that
L = 3.2 m
d = 1.2 mm
r = 0.0006 m
ΔL = 1.6 mm = 0.0016 m
Find the surface area
A = π . r²
A = π . 0.0006²
A = 3.6π x 10¯⁷ m²
Find the young's modulus
Y = σ / ε
Y = (F/A) / (ΔL/L)
Y = (k.ΔL / A) / (ΔL/L)
Y = ( k . 0.0016 / 3.6π x 10¯⁷ ) / ( 0.0016 / 3.2 )
Y = 2.83k x 10⁶ Pa
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a round reinforcing bar constructed from cold-rolled steel and 320 mm long is required to support a tensile load of 65 kn. determine the minimum cross-sectional area if the stress cannot exceed 240 mpa or elongate more than .42 mm.
The minimum cross-sectional area if the stress cannot exceed 240 mpa will be 19mm.
What is cross-sectional area?
The cross-sectional area consequently depends on where and how that plane is crossing (intersecting) the 3-dimensional object. For example, a straight piece of (cylindrical) pipe, because once crossed by a plane perpendicular to the direction (cylindrical symmetry axis), the cross-sectional area is a circular ring; even as plane tilts along the axis, crossing iit at an angle between 90 and 0 degrees, the cross-sectional area becomes larger as well as of elliptical shape.
L=320mm=0.32m
P=65000N
бт=240×10⁶N/m²
240×10⁶> 65000/(π/4×d²) ∴бт= load/(c/s area)
∴ d= 18.57mm
∴d=19mm
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an analog signal with a bandwidth of 36mhz is sampled at a frequency (fs) of 36,000,000 samples per second during the adc (analog-to-digital conversion) process. what is the outcome of the received signal after the dac (digital-to-analog conversion) process? selected answer: b. the signal will not experience aliasing answers: a. the signal will have experienced aliasing b. the signal will not experience aliasing c. the signal will perfectly represent the original pre-adc analog signal d. none of the above describes the outcome
The signal will have experienced aliasing after the dac (digital-to-analog conversion) process.
What do you mean by signal?
A signal is any time-varying voltage, current, or electromagnetic wave that transmits information in electronics and telecommunications.
Given, the bandwidth of the signal [tex]f_{m}[/tex]= 36MHz
= 36 × 10⁶ Hz
The sampling frequency f₈ = 36 × 10⁶ Hz
If the sampling frequency is equal to the signal's bandwidth, aliasing will occur.
According to the Nyquist requirements, a repeating waveform can be successfully reconstructed if the sampling frequency is greater than twice the highest frequency to be recorded.
∴According to Nyquist criterion, for flawless reconstruction of an original signal, i.e. without aliasing effect;
Then, f₈ ≥ 2[tex]f_m[/tex]
So, A is the right answer.
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on the i-35w bridge, fatigue cracks in the deck truss and in the approach span girders were observed in an inspection. what was the solution devised to deal with this cracking?
An assessment of the i-35w bridge revealed fatigue cracks in the deck truss and approach span girders. Fatigue crack arresting holes were drilled in the components to deal with this cracking.
What is fatigue?
Fatigue is defined in materials science as the beginning and propagation of cracks in a material caused by cyclic loading. Once a fatigue crack has begun, it expands a little amount with each loading cycle, resulting in striations on some portions of the fracture surface. The crack will continue to grow until it reaches a critical size, which occurs when the crack's stress intensity factor exceeds the material's fracture toughness, resulting in rapid propagation and, in most cases, total fracture of the structure.
An inspection in 2001 revealed fatigue cracks in the deck truss and approach bridge girders on the I-35 Bridge. Because of the fissures, the cross girders were also distorted. As a result, the problem was managed by cutting holes in the components and adding support struts to the cross girders for added stability.
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a concrete mix with a 3-in. slump, w/c ratio of 0.50, and sand with a fineness modulus of 2.4 contains 1700 lb/yd3 of coarse aggregate. compute the required weight of coarse aggregate per cubic yard.
The weight of the coarse aggregate is 1247.63 kg/m³
How to calculate the weight?Fineness modulus = 2.4
Bulk unit weight = 118 = 1890.63 kg/m3
Slump = 3inches = 76mm
Assume a 20mm maximum size of aggregate and non-air-entrained concrete, the approximate requirements for mixing water and air content for different workabilities and nominal maximum size of aggregate is illustrated.
The slump of 76mm, 20mm size of aggregate, water content is 200 kg/m3³.
The required cement content arrow = 200/0.5
= 400 kg/m³
Now, the dry bulk volume of coarse aggregate per unit volume of concrete. The value for 20mm aggregate, fineness modulus is 2.4, a bulk volume of dry rodded coarse aggregate is 0.66
Therefore, the weight of coarse aggregate will be:
= 0.66 x 1890.36
= 1247.63 kg/m³
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the analog telephone line has maximum frequency 4 khz. analog telephone signal converted to digital. which sampling frequency analog - to- digital pcm converter must have ?
The analog telephone signal must be sampled at a minimum of 8 kHz to be converted to digital using PCM.
What is PCM?
In order to represent sampled analogue signals digitally, one technique is pulse-code modulation (PCM). It serves as the industry standard for digital audio in applications such as digital telephony, compact discs, and computers. In a PCM stream, overall amplitude of the analogue signal is quantized to a nearest value inside a range of digital steps for each regular, uniformly spaced sample. A particular variant of PCM called linear pulse-code modulation (LPCM) has linearly uniform quantization levels. In contrast, PCM encodings (such as those using the A-law or -law algorithms) have quantization levels that are dependent on amplitude. PCM is a more broad term, but it's frequently used to refer to data that has been encoded using LPCM.
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technician a says that burning of fossil fuels has increased the greenhouse gas co2 in the atmosphere. technician b says that increased lumber operations have removed trees, increasing the levels of co2 in the atmosphere. which technician is correct?
According to the question of fossil fuels, technician A is correct.
What is fossil fuel?
A fossil fuel is a hydrocarbon-containing material that occurs naturally in the Earth's crust as from remains of deceased plants and animals and is gathered and utilised as a fuel. Coal, crude oil, and natural gas are the primary fossil fuels. Fossil fuels can be burned to generate direct heat, power engines, or generate electricity.
Burning of fossil fuels has increased greenhouse gas CO2 levels in the atmosphere. When fossil fuels are burned, significant volumes of carbon dioxide, a greenhouse gas, are released into the atmosphere. Greenhouse gases trap heat in our atmosphere, which contributes to global warming. Already, the average global temperature has risen by 1 degree Celsius.
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when reinstalling a repaired engine, tech a says all components and fasteners should be installed starting at the bottom and working up. tech b says the exhaust pipes must be aligned with the manifolds or headers as the engine is lowered into place on some models. who is correct
Technician b is correct who says that exhaust pipes need to be aligned with the header or manifolds since the engine is lowered into place on some models.
Exhaust manifolds are used to collect exhaust gases from the ports in the cylinder heads of engines, and then route the exhaust gases to the remaining areas of the exhaust system. The exhaust manifolds act as a connection point for the exhaust pipes. In order to make the engines work efficiently and properly, exhaust pipes need to be aligned with exhaust manifolds. It is because when the engine is lower than the exhaust system, it becomes a cause exiting a low amount of exhaust gases.
Thus, it is concluded that only technician b is correct that exhaust pipes and exhaust manifolds must be properly aligned with each other. Whereas technician a is not correct it is because components and fasteners can be installed in any way that seems suitable.
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single-stage centrifugal fire pumps use a single intake impeller and a simple casing to provide flow capacities up to: select one: a. 500 gpm (2 000 l/min). b. 1,000 gpm (4 000 l/min). c. 2,250 gpm (9 000 l/min). d. 3,500 gpm (14 000 l/min).
Single-stage centrifugal fire pumps use a single intake impeller and a simple casing to provide flow capacities up to 2,250 gpm (9 000 L/min).
What is fire pump?
When discussing fixed-place fire suppression systems like fire sprinklers, standpipes, or foam systems, a fire pump often refers to a pressure-increasing element of the water supply. Similar to fire hose operations, fire pumps are an essential component built into fire trucks & fire boats. They increase the water supply. Fire pumps are used to boost the pressure of water coming from a static supply or a municipal subterranean water supply piping network (e.g., tank, reservoir, lake). A centrifugal or positive displacement pump that has been certified and listed for use in the fire service by a third-party testing & listing organisation, such as UL or FM Global, is referred to as a fire pump.
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a 30-station transfer line has an ideal cycle time of 0.75 min, an average downtime of 6.0 min per line stop occurrence, and a station failure frequency of 0.01 for all stations. determine the current line efficiency and produc
The current line efficiency is 29.41% and production rate is 23.52pc/hr
What is efficiency?
Efficiency is the capacity to avoid wasting materials, energy, efforts, money, and time when performing something or getting a desired outcome. In a broader sense, it is the ability to execute things properly, successfully, and efficiently. According to Deborah Stone, efficiency is "therefore not a goal in and of itself." It is something we want not for its own sake, but because it allows us to obtain more of the things we value.
Given data is,
ideal cycle Time = 0.75 min
Failure frequency of 0.01 for all Stations.
Average downtime = 6min
a). Frequency of line stops is,
F=np (i)
Where,
n = Work Stations
P = frequency of Station breakdown
∴n=30, P=0.01
⇒ F = 30 (0.01) = 0.3
Finding coefficient of line efficiency (E):
Formula, E = Tc/Tp×100%
where, Tc= cycle time
Tp=Average production time
∴ Tp= Tc+FTd
⇒Tp = 0.75+(0.3)(6)
= 2.55min/pc
Line efficiency(E)= (0.75/2.55)×100%
E= 29.41%
Production rate(Rp):
Rp= 1/Tp
Rp= 1/2.55
=0.392 (pc/min).(min/1hr)
=0.392×60pc/hr
= 23.52pc/hr
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which is typically driven through a gear box and a clutch connected by a drive shaft to the front of the crankshaft? select one: a. midship pump b. front-mount pump c. power-take-off (pto) drive d. auxiliary engine driven pump
Auxiliary engine-driven pump is typically driven through a gearbox and a clutch connected by a drive shaft to the front of the crankshaft.
What is gearbox?
Gearboxes are basically a collection of gears and their casings, which are most typically found in automobiles. Because most motor vehicle engines have high operating and idling speeds, gearboxes allow machinery to run more effectively and even assist in slowing and shutting down machinery. Gearboxes are used in autos, turbines, and heavy machinery to transfer energy from one rotating power source to another. More information on how a plethora of internal components combine to enable safe movement in practically all types of equipment may be found in the Crankshaft and Piston definitions.
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