A National Grid substation is a sizable facility where 275 kV and 400 kV subterranean cables and overhead power lines are switched, and where electricity is converted to 132 kV for distribution to nearby communities.
Although not all substations have all of the above capabilities, substations are made to do the following tasks: Increase or decrease the voltage. To account for variations in system voltage, regulate the voltage. Switch the grid system's transmission and distribution circuits in and out. Through transmission and distribution power lines, power plants produce electricity that is then distributed to clients. Electricity is transported over vast distances to satisfy consumer needs using high-voltage transmission lines, including those that dangle between tall metal towers.
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for non-functional requirements in requirements engineering what are the constraints that the system must satisfy as well as the standards that the delivered system must meet?
The system must satisfy the constraints of the problem domain as well as the standards of the delivered system.
What is delivered system?
A courier is a business or individual who transports a package from one location to another. FedEx, Parcel Monkey, and Hermes Group are a few well-known examples. The Royal Mail is somewhat of an anomaly, as are the majority of delivered system. In order to provide more specialised or regional services, deliver multiple shipments, and relieve sellers of obligation, courier delivery services are frequently utilised for e-commerce fulfilment. While larger firms may have contracts using courier services for cost-effective mass delivery, smaller enterprises, like independent merchants, are more likely to rely on public services like the Royal Mail.
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technician a says that if a fuse blows as soon as it is installed, a short to ground is indicated. technician b says the component will not turn off if the short to ground is on the ground side of the load component but before a grounding switch. who is correct?
Both technicians A and B are correct. It is because when a just-installed fuse blows, it indicates a short-to-ground. If the short-to-ground is on the ground side of the load component and before a grounding switch, the component is not turned off.
A short-to-ground is a term used to refer to a short circuit that has a direct connection to the ground. A short-to-ground in the electrical system can cause a fuse to blow when a component is just installed. When a short-to-ground occurs on the ground side of the installed component but before a grounding-side switch, it usually not results in turning the component off.
As per the above description, it is concluded that both technician A and technician B state correctly.
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the wind velocity on the upstream side of a wind turbine is 5.2 m/s. if the turbine extracts 31% of the available kinetic energy, what is the wind velocity on the downstream side of the turbine in m/s? please include one decimal place in your answer.
The wind velocity on the downstream side of the turbine in 4.3 m/s.
What do you mean by wind velocity?
Wind velocity is the wind speed measured at 2 metres above ground at pedestrian level. It is an air ventilation metric that has a direct impact on outdoor thermal comfort. It has been demonstrated that urban morphology or building coverage adversely affects air ventilation.
Given, wind veloocity on upstream, V= 5.2m/s
Proportion of kinetic energy extraction= 31%
=31/100
=0.31
As we know that,
kinetic energy=1/2mv²
=1/2m×(5.2)²
=13.52m-------(1)
where, m= mass, v= velocity
Remaining kinetic energy on downstream
=13.52m×(1-0.31)
=9.3288m
Now, velocity at downstream= 1/2mu²
⇒9.3288m=1/2mu²
⇒u²=(9.3288×2×m)/m
⇒u=√19.6576
=4.3194444
Therefore, velocity at downsteam ≅ 4.3m/s
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as you perform a sonographic exam, you switch from a 3.5 mhz transducer to a 7.0 mhz transducer to image a superficial structure. compared to the 3.5 mhz transducer, what will the 7.0 mhz attenuation rate and wavelength be?
Double the attenuation rate, one-half the wavelength will the 7.0 mhz attenuation rate and wavelength.
What is wavelength?
The wavelength of a periodic wave is the distance over which the wave's shape repeats in physics. It is the distance between two successive corresponding locations of the same phase on the wave, such as two neighbouring crests, troughs, or zero crossings, and it is a feature of both travelling and standing waves, in addition to other spatial wave patterns.
The rate of attenuation doubles when the frequency is doubled, but the wavelength is halved. Wavelength decreases as frequency increases, improving resolution while decreasing penetration due to greater sound absorption.
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two technicians are discussing conductance testing a battery. technician a says that conductance testing will measure the battery's available cca's. technician b says that conductance testing will measure the battery's voltage. who is correct?
According to the question of voltage, technician B is correct.
What is voltage?
Voltage is the difference in electric potential between two points, often known as electric pressure, electric tension, or (electric) potential difference. It refers to the labour required per unit of charge to move a test charge between two places in a static electric field. The derived unit for voltage in the International System of Units is called volt. Work per unit charge is defined in SI units as joules per coulomb, where 1 volt equals 1 joule (of work) for 1 coulomb (of charge).
Conductance testing measures the battery's voltage.
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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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technician a says that the pcv system should create a slight pressure in the crankcase at idle. technician b says that the pcv system should create a slight vacuum in the crankcase at 2,500 rpm. which technician is correct?
When technician A says that the PCV system should create a slight pressure in the crankcase at idle and Technician B says that the PCV system should create a slight vacuum in the crankcase at 2,500 RPM. The correct technician is Technician B.
What is a PCV System?It is to be noted that the PCV controls the pressure used to clear blow-by gases from the crankcase. The pressure-regulating valve lowers the vacuum effect in the crankcase by directing away the blow-by gases. This keeps the engine seals from being damaged (which could be blown out if the pressure gets too high).
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Full Question:
Technician A says that the PCV system should create a slight pressure in the crankcase at idle. Technician B says that the PCV system should create a slight vacuum in the crankcase at 2,500 rpm. Which technician is correct?
A) technician A
B) technician B
C) both technicians A and B
D) neither technicians A nor B
1. truss abc is changed by decreasing its height from h to 0.9 h. width w and load p are kept the same. which one of the following statements is true for the revised truss as compared to the original truss? a) force in all its members have decreased. b) force in all its members have increased. c) force in all its members have remained the same. d) none of the above.
truss abc is changed by decreasing its height from h to 0.9 h. width w and load p are kept the same - force in all its members have increased. is the correct statement
What is force?
According to Aristotle, a force is something that causes an item to move "unnaturally." One of the first researchers to explore force and gravity was Sir Isaac Newton. A push or a push is all that constitutes a force. It might be compared to pushing or pulling on an object. An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude. An application of force is the location at which force is applied, and the direction in which the force applied is defined as the the force's direction.
After resolving the members, we obtain the increased component for each member, which causes the force in each member to rise as the height decreases and the angle at each vertex increases.
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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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alternators have all of the following characteristics except: group of answer choices greater wattage output at lower rpm. lower maximum rpm. smaller physical size and weight for a given output. greater reliability and longer service life.
Option d is correct
The alternators do not provide greater reliability and longer service life. This is because any sudden change in the current will result in overheating which will damage it.
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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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8. what precautions would you take in machining with brittle tool materials, especially ceramics? what rake angle (positive or negative) would you choose?
Answer: Negative!
Explanation:
With brittle tool materials, we first want to prevent chipping, such as by using negative rake angles and reduce vibration and chatter. Also, brittleness of ceramic tools applies to thermal angles and reduce vibration and chatter. Also,
brittleness of ceramic tools applies to thermal
gradients, as well as to strains. To prevent tool
failures due to thermal gradients, a steady supply of cutting fluid should be applied, as well
as selecting tougher tool materials.
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a cranking current test is performed, and the amperage is found to be less than specification. technician a says the starter is bad and it should be replaced. technician b insists on testing the resistance of the cables, grounds, and connections. who is correct?
According to the question of resistance, technician b is correct.
What do you mean by resistance?
The resistance of an electrical circuit to current flow is measured. Although the term "resistance" may sound negative, it has a good application in electricity. The Greek letter omega represents resistance, which is measured in ohms ().Resistance cannot be measured in an active circuit. As a result, troubleshooting personnel frequently assess resistance by measuring voltage and current and applying Ohm's Law.
Resistance in the cables, grounds, and connections can cause the starter to draw too much current. the cranking current test will indicate if the starter is good.
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in selected material systems, the s-n curve describing fatigue failure displays a horizontal or asymptotic region. what is this portion of the curve called?
The S-N curve describing fatigue failure displays a horizontal or asymptotic region is called the fatigue limit S-N curve.
Fatigue properties of materials are often described using the fatigue limit or the S-N curve (fatigue curve, Wöhler curve). The S-N curve describes the relationship between cyclic stress amplitude and several cycles to failure. An S-N curve can be described as the number of cycles to failure, N(S), when a material is repeatedly cycled through a given stress range S. OrcaFlex uses the S-N curve to calculate the danger in fatigue analysis. If needed you can establish several different S-N curves and use them at different arc lengths along a line.
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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
a person with a background in engineering, computer science, or physics might choose to work as a technical specialist in a high-tech sector. this type of support role is referred to as a(n)
A person with a background in engineering, computer science, or physics might choose to work as a technical specialist in a high-tech sector this type of support role is referred to as a(n) sales engineer.
What is the role of sales engineer?Sales engineers have a focus on cutting-edge technology and scientific products. They make use of their technical expertise to highlight the advantages of their goods and services to potential clients and to demonstrate how they outperform those of their rivals.
Traveling to see prospective customers. establishing new ties with clients and preserving current ones. handling and interpreting client demands. influencing customers to believe that a product or service will best meet their needs.
His kind of work has significant earning potential, especially with commission. Best of all, sales engineers can often transition with ease into a related field like consulting or product management—or ascend to a sales management role.
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a pulsed-wave transducer has a resonant frequency of 6 mhz. the lowest frequency in the pulse is 3 mhz and the highest is 12 mhz. what is the bandwidth?
The bandwidth of this pulsed-wave transducer is calculated to be 9 MHz if the lowest frequency in the pulse is 3 MHz and the highest is 12 MHz.
Bandwidth is a term used related to frequency, which represents the range of frequencies occupied by a modulated radio-frequency signal which in this case is a pulsed-wave transducer.
It is usually given in hertz (Hz) or megahertz (MHz). It can also be given as a percentage of the radio frequency.
In other words, bandwidth refers to the difference between the highest frequency and the lowest frequency found in a pulse. Therefore;
bandwidth = highest frequency - lowest frequency
Substituting the values of the given highest and lowest frequency in this equation;
bandwidth = 12MHz - 3MHz
bandwidth = 9MHz
Therefore, the bandwidth of this pulsed-wave transducer is calculated to be 9MHz.
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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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an engineer receives an alert from a mobile system equipped with an rfid tag. upon investigating, the mobile system is missing from its assigned station. which alarm type prompted the engineer to investigate?
Since the engineer upon investigating, the mobile system is missing from its assigned station. the alarm type that has prompted the engineer to investigate is Proximity.
Is RFID a sensor for Proximity?On a more fundamental level, RFID tagging is just a sophisticated proximity sensor. When a piece of metal is there, a proximity sensor notices that a pallet has just arrived there.
Note that Tags and readers are the two halves of the wireless system known as Radio Frequency Identification (RFID). The reader is an electronic gadget with one or more antennas that transmit radio waves and take in signals from RFID tags.
Hence, it is seen as a tool that detects the presence of nearby objects. A proximity sensor on a mobile phone is typically used to determine when the phone is held close to the face. The answer is proximity because the mobile system is far from where the signal can pick.
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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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a cylindrical specimen of some metal alloy 7.0 mm in diameter is stressed in tension. a force of 5270 n produces an elastic reduction in specimen diameter of 0.0049 mm. calculate the elastic modulus (in gpa) of this material if its poisson's ratio is 0.35. enter your answer in accordance to the question statement gpa
The substance can affect the modulus of elasticity. For instance, the elastic modulus of concrete is about 30 GPa, but the elastic modulus of steel is about 200 GPa (29,000,000 psi) (4,350,000 psi).
Elasticity modulus for aluminum is 69 GPa. The elastic modulus is the slope of the Stress-Strain Curve prior to the onset of plastic deformation. The modulus line's slope is influenced by the atomic composition of the metal. The bulk of the atomic unit cell of steels is composed of nine iron atoms, one in each of the cube's four corners and one in the center. Elastic modulus, commonly known as the modulus of elasticity, is a measure of a material's resistance to undergoing elastic deformation when a load is applied.
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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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what is the theoretical maximum signaling rate for a channel with the above frequency distribution? [6 points] (b) what is the theoretical maximum bit rate for this channel if a phase- amplitude modulated signal with 64 levels is transmitted over the channel? [6 points] (c) what is the actual maximum bit rate if the signal to noise (s/n) ratio for this channel is 33.111 db?
On a noiseless 3-kHz channel, binary signals cannot be carried faster than 6000 bps (= 2 x 3000 log2 2).
Once Nyquist understood what we were discussing, he offered a simple equation to calculate the Maximum Data Rate (MDR) of a noiseless channel. L represents the signal's level or condition, and MDR is computed as 2 * Bandwidth * Log2L. Any channel has a defined signal-to-noise ratio at a given temperature. SNR = (Power of signal) / is hence directly proportional to the channel capacity (power of noise). For example, 10 * log10(1000) = 30 dB is a common formula for a signal-to-noise ratio of 1000. a frequency that, if the data supported it, would be the theoretical distribution law frequency rather than the observed frequencies.
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consider that one diode in the bridge rectifier fails shorted. explain how the normal circuit operation changes. does some element overload? does the output change?
Diodes in rotating rectifiers may fail owing to Open Circuit (OC) or Short Circuit (SC), overloading the exciter and preventing the alternator from running safely. Overheating will cause damage to the Xmer or AC source delivering power to the bridge rectifier.
What happens when a diode shorts in a bridge rectifier?A direct short-circuit occurs when any one diode is damaged, which is detected by the AC power supply. Overheating will cause damage to the Xmer or AC source delivering power to the bridge rectifier.
The same symptom as in the center-tapped circuit will be displayed by an open diode in a full-wave bridge rectifier, as shown in the below figure. For the first half of the input voltage cycle, the open diode stops current from flowing through RL. Half-wave rectification is the end result, and at 60 Hz, this doubles the ripple voltage.
Diodes in rotating rectifiers may fail owing to Open Circuit (OC) or Short Circuit (SC), overloading the exciter and preventing the alternator from running safely. This is due to the aging phenomenon and continuous process regime.
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the given fsm has input b, output z, and starts in state x. what is the fsm's resulting output if b is 1 on the first rising clock edge, 1 on the second, and 1 on the third?
The fsm's resulting output if b is 1 on the first rising clock edge, 1 on the second, and 1 on the third is Z=1.
What is fsm?
A finite-state machine (FSM), sometimes known as a finite automaton (FSA, plural: automata), or simply a state machine, is a mathematical model of computation. It is an abstract machine that can only be in one of a finite set of states at any one moment. In response to some inputs, the FSM can transition from one state to another; this transition is referred to as a transition. An FSM is defined by a set of states, an initial state, and the inputs that cause each transition. There are two kinds of finite-state machines: deterministic finite-state machines and non-deterministic finite-state machines. A deterministic finite-state machine can be built in the same way as any non-deterministic one.
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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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high-bypass ratio (separate exhaust) turbofan engine powers a commercial transport. at the cruise condition, the flight and engine operating conditions are:
In the cruise situation, the flight and engine working situations are equal to the weight, and the thrust is equal to the drag.
In a cruise situation for the aircraft in satisfactory situation technique, the forces performing on an aircraft in flight can be in equilibrium and produce no internet outside force. In this situation, the increase is equal to the weight, and the thrust is equal to the drag.
Cruise flight can be described because of the phase of flight that falls between climb and descent. the maximum crucial probabilities of enjoy time and enjoy gas are fed on normally in this phase of flight.
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technician a says that the cranking circuit should be tested for proper amperage draw. technician b says that an open in the control circuit will not prevent starter motor operation. which technician is correct?
Technical A is correct; check the cranking circuit for adequate amperage draw.
What is the operation of a starter motor?When you turn on the ignition, an internal electromagnet inside the body activates and forces a rod with a pinion connected outward. As the pinion and flywheel make contact, the starter motor rotates.This causes the engine to spin and pull in air (as well as fuel). A starter is a device that rotates (cranks) an internal combustion engine so that it can begin running on its own power. It is also referred to as a self-starting, cranking, or beginning motor.The starter motor is powered by the solenoid, which assists in moving the starter gear forward so that it meshes with the engine flywheel.This flywheel is attached to the crankshaft of the engine and rotates with it as the starter motor turns.To learn more about starter motor operation, refer to:
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on a vehicle with dual filament brake / taillight bulbs, whenever the brake pedal is pressed the taillights as well as the brake lights of the vehicle illuminate dimly. technician a says the brake lights / taillights may have a poor ground connection. technician b says the brake light switch may have excessive resistance. who is correct?
Technician A exists correct. In contrast to brake lights, which turn on instantly when you hit the brakes, tail lights are activated by turning on your headlights or applying the parking brake.
Why would the brake warning light come on when you press on the foot brake?When you press on the brake pedal, friction material from the brake pads snags the rotors. Over time, that friction substance deteriorates. When your brake pads are getting close to their minimum thickness, tiny sensors recognize it and turn on the dash light to alert you that it's time for brake maintenance.
In contrast to brake lights, which turn on instantly when you hit the brakes, tail lights are activated by turning on your headlights or applying the parking brake. The brake lights are a brighter red than the tail lights, which are typically red on cars.
One of three things could be the case if one or more of your brake lights aren't functioning properly: either the brake light system fuse has blown, the brake light bulbs have burned out, or the brake light wire switch has malfunctioned. These problems are all simple to fix.
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