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Tüm türler5,215Çoktan seçmeli2,665Çoklu seçim6Doğru / Yanlış260Sayısal512Eşleştirme930Sıralama396Boşluk doldurma397Kısa cevap49
Soru 21Soru →

A technician needs to replace the coil spring on a MacPherson strut assembly that has been removed from a vehicle. What is the correct chronological order of steps required to safely disassemble the strut assembly?

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Cevap

The correct sequence is: first secure the strut assembly in a bench fixture, next compress the coil spring with an approved compressor tool, then remove the damper shaft center retaining nut, and finally remove the upper strut mount and slide the spring off the strut body.
The correct procedure starts by securing the strut in a bench fixture. Next, the coil spring must be compressed with a spring compressor to relieve the preload acting against the upper spring seat. With spring tension relieved, the technician safely removes the center shaft retaining nut, and then removes the upper mount to slide the coil spring off the damper.

Adım Adım Çözüm

1
Secure the strut assembly in a holding fixture or vise.
The strut assembly is stabilized for mechanical service.
Prevents the component from shifting or slipping during high-torque operations.
2
Compress the coil spring with a spring compressor.
Spring preload on the upper strut mount is fully relieved.
Crucial safety step to prevent stored spring energy from violently releasing when fasteners are removed.
3
Remove the center shaft retaining nut.
The upper mounting hardware is mechanically released from the damper rod.
The retaining nut holds the upper plate and damper shaft together.
4
Remove the upper strut mount and remove the spring.
The strut assembly is fully disassembled into its primary components.
Allows replacement of the worn or broken coil spring.

Anahtar Kavram

MacPherson strut spring disassembly safety and procedure
Tahmini Süre:1m 0s
Soru 22Soru →

A technician is preparing to service a removed MacPherson strut assembly to replace a worn hydraulic damper unit. In what sequential order should the technician perform the disassembly process to ensure mechanical integrity and workshop safety?

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Cevap

Mount the complete strut assembly securely in a fixture, compress the coil spring until tension is relieved from the upper seat, remove the center upper piston rod locknut, and lift off the upper mount and compressed spring components from the damper body.
The correct sequence begins with securing the strut assembly in a holding fixture to ensure stability. Next, the coil spring must be compressed using a specialized spring compressor to neutralize the substantial preload energy acting on the upper spring seat. Only after all spring force is relieved from the top plate can the center damper piston rod locknut be safely unthreaded. Finally, with the fastener removed, the upper mount, bearing assembly, and compressed spring can be lifted off the damper body.

Adım Adım Çözüm

1
Secure the strut assembly in a dedicated holding fixture.
The strut is firmly anchored, preventing unexpected movement during heavy tool usage.
Safe disassembly requires stabilization to prevent slipping when torque and compression tools are applied.
2
Apply a coil spring compressor and tighten evenly until the spring is free from the upper mount.
Stored mechanical spring force is contained within the tool rather than acting against the upper mount.
MacPherson strut springs are under heavy preload; removing the fastener while under tension can cause severe injury.
3
Loosen and remove the top piston rod retaining nut while preventing rod rotation.
The mechanical attachment between the upper mounting plate and the damper shaft is disconnected.
The retaining nut holds the top seat to the damper shaft; loosening it without tension on the seat allows safe removal.
4
Disassemble the upper mount, bearing assembly, dust boot, and compressed spring from the strut body.
The damper unit is fully isolated and ready for replacement or inspection.
With the locknut removed, all upper hardware slides freely off the piston rod.

Anahtar Kavram

MacPherson Strut Safety and Disassembly Procedure
Tahmini Süre:1m 30s
Soru 23Soru →

In a modern Speed-Density electronic fuel injection (EFI) system, the Powertrain Control Module (PCM) must precisely calculate and deliver fuel. Arrange the following sequence of events in the correct chronological order, starting from the physical engine stroke to the final fuel delivery.

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Cevap

The correct sequence is: the intake stroke creates a pressure drop, sensors read the pressure and temperature, the PCM calculates the air density, the PCM computes the required injector pulse width, and finally, the injector is electrically energized.
In a Speed-Density EFI system, the sequence must strictly follow the flow of physics to data to actuation. The mechanical action of the engine draws in air (Step 1), which is immediately measured by the primary input sensors (Step 2). The PCM uses this raw data to calculate the physical air density (Step 3). Only after the air mass is known can the PCM calculate the target fuel amount (pulse width) required to maintain a 14.7:1 ratio (Step 4). Finally, the PCM sends the electrical signal to actuate the fuel injector (Step 5).

Adım Adım Çözüm

1
Identify the initiating mechanical action in the internal combustion cycle.
The piston's downward movement creates a pressure differential (vacuum) in the manifold.
Airflow calculation begins with the mechanical force that draws air into the engine.
2
Determine how the engine management system first detects this mechanical change.
The MAP and IAT sensors read the current pressure and temperature of the air in the manifold.
Before a computer can process data, the primary sensors must gather real-time environmental metrics.
3
Identify the primary air calculation made by the Powertrain Control Module (PCM).
The PCM calculates the air density and mass.
In a Speed-Density system, the PCM must combine pressure (MAP) and temperature (IAT) with engine speed (RPM) to mathematically calculate the density of the air.
4
Determine the subsequent fuel calculation step.
The PCM computes the necessary injector pulse width.
Once the air mass is definitively known, the PCM applies the target stoichiometric ratio (14.7:1) to determine how long the injector must stay open.
5
Identify the final actuation in the fuel delivery process.
The fuel injector solenoid is energized.
The electrical signal generated by the PCM physically opens the pintle valve in the injector to spray the pressurized fuel.

Anahtar Kavram

Speed-Density Electronic Fuel Injection (EFI) Sequence of Operation
Soru 24Soru →

An electrical technician is evaluating four substances for an electronics assembly based on how easily charge carriers move through their atomic lattices. What is the correct order of these materials when arranged from highest electrical conductivity (greatest electron flow) to lowest electrical conductivity (highest resistance to current flow) at room temperature (25∘C25^\circ\text{C})?

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Cevap

Silver, followed by Intrinsic Germanium, Intrinsic Silicon, and finally Mica.
Electrical conductivity is determined by the density of free charge carriers available in a material's conduction band. Silver is an excellent metallic conductor with free electrons that readily drift under an applied electric field. Germanium and silicon are Group IV semiconductors; because germanium has a narrower forbidden bandgap (0.67 eV0.67\text{ eV}) than silicon (1.12 eV1.12\text{ eV}), more electron-hole pairs are thermally excited across the gap at room temperature, making germanium more conductive than silicon. Mica is an inorganic insulator with tightly held valence electrons and a very wide forbidden energy gap, giving it the lowest electrical conductivity in the sequence.

Adım Adım Çözüm

1
Identify the metallic conductor
Silver is identified as the conductor with the highest concentration of free valence electrons.
Metals have overlapping valence and conduction bands, providing high electrical conductivity.
2
Compare the semiconductor bandgaps
Intrinsic Germanium (Eg≈0.67 eVE_g \approx 0.67\text{ eV}) has higher conductivity than Intrinsic Silicon (Eg≈1.12 eVE_g \approx 1.12\text{ eV}).
A smaller bandgap allows more valence electrons to bridge into the conduction band at room temperature.
3
Identify the electrical insulator
Mica is placed last with the lowest electrical conductivity.
Insulators have full valence bands separated from conduction bands by large forbidden energy gaps.

Anahtar Kavram

Ranking material electrical conductivity based on atomic structure, valence electron availability, and energy bandgap size across conductors, semiconductors, and insulators.
Tahmini Süre:1m 30s
Soru 25Soru →

An electronic technician needs to measure the resistance of a resistor installed on a circuit board to verify its value. What is the correct sequence of steps to safely and accurately perform this measurement?

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Cevap

Disconnect power to the circuit →\rightarrow Isolate at least one lead of the resistor →\rightarrow Set the multimeter dial to resistance (Ω\Omega) →\rightarrow Place the test probes across the component leads and observe the display.
The correct sequence begins with de-energizing the circuit for safety and instrument protection, isolating at least one lead to eliminate parallel circuit paths, configuring the multimeter to the Ohms function, and finally contacting the leads across the component to observe the reading.

Adım Adım Çözüm

1
Ensure all power to the circuit is disconnected.
The circuit is completely de-energized and safe to work on.
Multimeters measure resistance by supplying their own small internal voltage; external power will damage the meter and produce invalid readings.
2
Lift or disconnect at least one lead of the resistor from the circuit board.
The resistor is isolated from other components.
Parallel paths in the circuit network would provide alternative current loops, causing the meter to read lower than the true component value.
3
Turn the rotary switch on the multimeter to the resistance (Ω\Omega) range.
The multimeter is configured in ohmmeter mode.
The meter must be in the correct mode before probes are applied to the device under test.
4
Connect the black and red test leads across the resistor terminals.
The resistance value appears on the digital readout.
The meter sends a small internal current through the component, measures the resulting voltage drop, and displays the calculated resistance.

Anahtar Kavram

Safely and accurately measuring component resistance requires de-energizing the circuit, isolating the component from parallel paths, selecting the Ohms mode, and applying the test probes.
Tahmini Süre:45s
Soru 26Soru →

A technician is troubleshooting a direct-current circuit that suddenly stopped operating. In what order should the technician perform the standard diagnostic steps to locate and resolve the fault safely?

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Cevap

The correct troubleshooting sequence begins with a visual inspection, followed by verifying supply voltage, then de-energizing the circuit, and finally measuring isolated component resistance.
Systematic troubleshooting follows a logical hierarchy: first perform a visual check for obvious physical damage; second, verify that input voltage is present; third, de-energize the circuit for safety; and fourth, perform resistance checks on isolated components to identify the specific faulty device.

Adım Adım Çözüm

1
Inspect the physical condition of the circuit.
Identifies obvious signs of overheating, loose terminals, or mechanical damage without disturbing connections.
Visual checks are fast, safe, and can resolve obvious problems immediately.
2
Measure input voltage while the circuit is connected to power.
Confirms whether proper operational voltage reaches the circuit input terminals.
If supply voltage is missing, troubleshooting must shift to the upstream power source rather than the circuit itself.
3
Shut off and isolate the power supply.
Removes all live electrical energy from the circuit.
Safety protocol requires de-energizing the circuit before testing resistance or removing parts.
4
Use an ohmmeter to measure continuity and resistance across individual components.
Pinpoints open coils, shorted semiconductor junctions, or out-of-tolerance resistors.
Ohmmeters supply their own internal battery voltage and will be damaged if used on an active, energized circuit.

Anahtar Kavram

Standard systematic troubleshooting progresses from non-invasive visual inspection to live voltage verification, followed by complete power isolation before conducting ohmmeter resistance measurements.
Tahmini Süre:45s
Soru 27Soru →

An electronics technician is sorting materials for a repair job based on their electrical properties. Arrange the following materials in order from the highest electrical conductivity (best conductor) to the lowest electrical conductivity (best insulator).

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Cevap

Copper, Germanium, Rubber
Metals like copper have a high concentration of free electrons, making them excellent conductors. Group IV elements such as germanium act as semiconductors with intermediate conductivity. Non-metallic compounds like rubber hold their electrons tightly in covalent structures, acting as insulators with the lowest conductivity.

Adım Adım Çözüm

1
Identify the conductor among the materials
Copper is identified as a conductor with high electrical conductivity.
Conductors have loosely bound valence electrons that move freely under an applied voltage.
2
Identify the semiconductor among the materials
Germanium is identified as a semiconductor with moderate electrical conductivity.
Semiconductors have four valence electrons and exhibit conductivity between conductors and insulators.
3
Identify the insulator among the materials
Rubber is identified as an insulator with extremely low electrical conductivity.
Insulators hold valence electrons tightly, offering very high resistance to current flow.
4
Sequence the materials from highest to lowest electrical conductivity
Copper (conductor) →\rightarrow Germanium (semiconductor) →\rightarrow Rubber (insulator)
The ranking follows the natural continuum of charge carrier availability in solids.

Anahtar Kavram

Classification and relative electrical conductivity of conductors, semiconductors, and insulators.
Tahmini Süre:45s
Soru 28Soru →

An electronics technician is tasked with creating an insulated, moisture-resistant in-line crimp splice on a stranded copper wire using manual electrical hand tools. In what sequential order should the following steps be executed to ensure proper mechanical strength and electrical integrity?

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The correct sequence is: (1) Trim the damaged conductor ends square using diagonal cutting pliers, (2) Slide the heat-shrink tubing onto one lead away from the joint, (3) Strip the insulation using the matched wire stripper notch, (4) Insert the wire into the butt connector and compress with the ratcheting crimper, and (5) Center the tubing over the joint and shrink with a heat gun.
Executing the sequence by trimming, staging heat-shrink tubing, stripping with sized stripper notches, crimping with a calibrated ratcheting tool, and finally heat-sealing adheres strictly to standard electrical assembly protocols, ensuring both conductor integrity and permanent insulation.

Adım Adım Çözüm

1
Cut and square off the wire conductors using diagonal cutting pliers.
Clean, perpendicular wire ends ready for stripping and connector seating.
Jagged or frayed wire ends prevent uniform insertion into crimp barrels and can puncture insulation.
2
Place heat-shrink sleeving over one wire harness branch before completing the splice.
Protective sleeving is staged on the wire harness.
Closed-loop in-line splices cannot accommodate non-split heat-shrink tubing once the terminal barrel is crimped to both sides.
3
Strip the manufacturer-specified strip length using the exact AWG-marked die of precision wire strippers.
Exposed copper strands with zero severed, nicked, or displaced wire strands.
Using an oversized notch fails to strip cleanly, while an undersized notch severs outer strands and reduces current-carrying capacity.
4
Seat the stripped conductors into the butt connector barrel and cycle the ratcheting crimper until the mechanism releases.
A gas-tight, cold-welded mechanical and electrical connection with high tensile pull-out strength.
Ratcheting crimpers enforce full compression of the terminal barrel without under-crimping or over-fracturing the metal sleeve.
5
Position the heat-shrink tubing symmetrically over the metal barrel and apply hot air evenly.
A fully insulated, moisture-proof, strain-relieved wire connection.
Even heating prevents scorching the wire insulation while ensuring the internal hot-melt adhesive flows to seal out moisture.

Anahtar Kavram

Standard sequential operation of electrical hand tools for wire preparation, mechanical termination, and splice insulation.
Tahmini Süre:1m 30s
Soru 29Soru →

A technician needs to test a household appliance heating element for continuity and resistance using a digital multimeter. What is the correct chronological sequence of steps to perform this measurement safely and accurately?

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Cevap

The correct chronological sequence is: first disconnect the appliance power supply, second disconnect at least one wire lead to isolate the heating element, third insert the test leads and set the multimeter dial to resistance, fourth touch probe tips together to verify meter zeroing and lead continuity, and fifth place the probe tips across the heating element terminals to read the resistance value.
The correct sequence follows standard electronics testing protocol: power must always be disconnected first for safety, the component must be isolated to prevent parallel loop paths from skewing readings, the meter must be properly set up, test leads must be shorted to verify zero calibration, and finally the probes are applied to measure the isolated component.

Adım Adım Çözüm

1
Disconnect electrical power from the appliance.
The appliance is completely de-energized.
Multimeters use an internal battery to pass a known current for resistance measurement; external voltage can blow the meter fuse, destroy internal circuitry, or cause electric shock.
2
Detach at least one wire connection from the heating element.
The component is electrically isolated from surrounding circuitry.
Leaving both ends connected allows current to pass through parallel components, resulting in a false, lower resistance reading.
3
Plug black lead into COM, red lead into Ω\Omega, and select the resistance range on the meter dial.
The digital multimeter is configured for resistance mode.
Proper jack selection and mode switching ensure the meter applies its internal reference voltage and measures current correctly.
4
Touch the test probe tips together.
The display indicates close to 0 Ω0\ \Omega.
This confirms good test lead integrity, proper meter zero reference, and active battery power.
5
Contact the probe tips to the two heating element terminals.
The true component resistance is displayed.
The meter measures the voltage drop across the isolated resistance element to calculate and display its value.

Anahtar Kavram

Safe and accurate multimeter resistance and continuity measurements require complete circuit de-energization, component isolation, proper lead/meter configuration, calibration verification, and direct terminal contact.
Tahmini Süre:1m 15s
Soru 30Soru →

A multi-component series circuit has failed and is drawing zero current due to an open fault. Arrange the following troubleshooting steps in the correct chronological sequence to safely and logically locate the open component using a digital multimeter (DMM) while the circuit is energized.

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Cevap

The correct sequence is to first verify the source voltage, anchor the negative reference lead, systematically probe downstream with the positive lead, observe the full source voltage across intact paths, and pinpoint the fault where the voltage abruptly drops to zero.
The voltage drop method is the most effective and professional way to locate an open fault in an energized circuit. In an open circuit, current cannot flow. According to Ohm's Law (V=I×RV = I \times R), if current (II) is zero, the voltage drop across any intact resistor is zero. Therefore, measuring anywhere between the positive terminal and the open fault will yield the full source voltage. Measuring anywhere after the open fault will yield zero volts because that section is physically isolated from the positive terminal but electrically connected to the negative reference. The steps outlined provide the logical, chronological, and safe procedure to trace this voltage path and isolate the break.

Adım Adım Çözüm

1
Understand the electrical behavior of an open circuit.
Current is 0 Amps, meaning intact resistors will have a voltage drop of 0 Volts (V=0×R=0V = 0 \times R = 0).
This principle dictates that the full source voltage will be measurable all the way up to the break.
2
Verify the baseline power supply.
The source voltage is confirmed to be present at the main terminals.
Troubleshooting downstream is useless if the main power source is dead or the battery is disconnected.
3
Establish a consistent measurement reference.
The black lead is fixed to ground, ensuring all readings are relative to 0 Volts.
Moving both leads simultaneously can cause confusion; anchoring one lead provides a steady reference point.
4
Trace the voltage potential through the circuit.
The meter reads full source voltage at each test point prior to the open fault.
The circuit wiring is intact up to the fault, extending the positive potential forward.
5
Identify the point of failure.
The fault is located exactly between the last point reading full voltage and the first point reading zero volts.
The open break physically separates the positive potential from the remainder of the circuit, causing the downstream voltage reading to drop to zero relative to ground.

Anahtar Kavram

Voltage Drop Troubleshooting Method
Tahmini Süre:1m 30s
Soru 31Soru →

An electrician needs to terminate a solid copper conductor onto a standard screw terminal. What is the correct sequence of steps to complete this operation using manual hand tools?

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Cevap

Strip the insulation using wire strippers, bend the bare conductor into a clockwise loop using needle-nose pliers, place the loop clockwise around the screw shank, and tighten the screw securely with an insulated screwdriver.
The proper sequence begins by using wire strippers to expose bare conductor. Next, needle-nose pliers are used to bend the wire into a clockwise hook. The hook is then seated around the screw post in the direction of rotation, and finally, an insulated screwdriver tightens the screw to secure the termination.

Adım Adım Çözüm

1
Select the correct gauge notch on manual wire strippers and remove approximately 3/4 inch of insulation from the solid conductor.
The bare copper conductor is exposed cleanly without nicks or damage.
Insulation must be removed prior to shaping or establishing electrical contact.
2
Grip the tip of the exposed copper wire with needle-nose pliers and form a smooth, clockwise U-shaped bend.
A terminal loop sized to fit around the screw post is created.
Needle-nose pliers provide the leverage and precision required to form an exact loop.
3
Hook the wire loop clockwise around the screw post under the screw head.
The loop is positioned so that standard clockwise screw rotation pulls the wire tighter instead of pushing it out.
Orienting the loop in the tightening direction prevents the wire from spreading open.
4
Drive and tighten the screw firmly against the conductor using an appropriately sized insulated screwdriver.
A mechanically stable, low-resistance electrical connection is completed.
The screwdriver clamps the wire tightly between the screw head and the contact plate.

Anahtar Kavram

Standard operating procedure for preparing and terminating a conductor onto a screw terminal using hand tools.
Soru 32Soru →

An electronics technician is troubleshooting a 24 V24\text{ V} direct-current (DC) control circuit that repeatedly trips its circuit breaker due to a suspected short circuit to ground. Arrange the following diagnostic procedures in the correct chronological order to safely locate and resolve the fault.

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Cevap

The correct troubleshooting procedure starts with de-energizing the circuit and verifying zero voltage, followed by visual inspection, disconnecting branch loads for isolation, measuring resistance to ground using an ohmmeter, and finally repairing the shorted component and verifying resistance before restoring power.
Effective and safe troubleshooting follows a structured logical progression: electrical safety isolation must occur first, followed by visual inspection, systematic branch isolation, ohmmeter resistance testing to locate the shorted path, and pre-power verification following repair.

Adım Adım Çözüm

1
De-energize and verify zero voltage on the circuit.
Protects the technician from electrical shock and prevents damaging the ohmmeter.
Ohmmeters supply internal sensing voltage and will be damaged if connected to an energized circuit.
2
Visually inspect conductors, terminals, and components.
Identifies obvious burned insulation, pinched wires, or loose metallic debris.
Visual inspection is the fastest and least invasive diagnostic method before mechanical disassembly.
3
Disconnect branch loads to isolate parallel circuit sections.
Separates parallel current paths from one another.
In parallel networks, a single short circuit to ground will reflect across all interconnected branches unless they are isolated.
4
Measure resistance from each isolated conductor to ground using an ohmmeter.
Locates the exact branch exhibiting abnormal near-zero resistance (0 Ω0\ \Omega).
A dead short creates an unintended low-resistance connection directly to chassis ground.
5
Repair the defective component and verify resistance prior to restoring power.
Ensures normal circuit resistance is restored and prevents immediate breaker tripping upon restart.
Verifying high resistance to ground on the repaired branch confirms the short has been eliminated before power is re-applied.

Anahtar Kavram

Systematic Isolation and Troubleshooting of a Short Circuit to Ground
Tahmini Süre:1m 15s
Soru 33Soru →

In an internal combustion engine, the energy generated during combustion travels through several internal components to create rotational power. Place the following components and mechanical events in the correct order of force transfer during the power stroke, from first to last.

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Cevap

Expanding combustion gases push against the piston crown, the wrist pin transfers force to the connecting rod, the connecting rod carries the thrust downward, and the crankshaft converts the linear force into rotational motion.
During the power stroke, expanding combustion pressure exerts force on the piston crown. This downward force passes through the wrist pin to the connecting rod, which in turn pushes against the crankshaft journal to produce rotational torque.

Adım Adım Çözüm

1
Identify the initial source of mechanical thrust in the cylinder.
Combustion pressure acts first on the piston crown.
Igniting air-fuel mixture creates rapid expansion in the cylinder, exerting immediate pressure on the movable piston face.
2
Trace the force through the pivot inside the piston.
The wrist pin receives the downward thrust from the piston.
The wrist pin passes through the piston skirt and holds the small end of the connecting rod.
3
Follow the mechanical path through the connecting rod.
The connecting rod pushes down on the crankshaft journal.
The beam of the connecting rod transfers linear motion from the wrist pin down toward the lower engine block.
4
Determine the final motion conversion at the bottom of the stroke.
The crankshaft converts the downward force into rotary power.
The offset throw of the crankshaft translates reciprocating linear travel into rotary torque.

Anahtar Kavram

Force transmission and motion conversion through internal engine components
Tahmini Süre:45s
Soru 34Soru →

Materials are categorized by their ability to facilitate or oppose the movement of electrical charge. Arrange the following substances in order from greatest electrical conductivity (easiest electron flow) to least electrical conductivity (highest electrical resistance).

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Cevap

Aluminum wire, Silicon wafer, Glass sheet
The correct sequence begins with Aluminum wire because metals are good conductors with low resistivity due to their sea of free electrons. Silicon wafer comes next because it is a semiconductor with four valence electrons, exhibiting moderate electrical conductivity. Glass sheet comes last because it is an insulator with a wide bandgap and tightly bound electrons, preventing current flow under normal operating conditions.

Adım Adım Çözüm

1
Identify the electrical classification of each listed material.
Aluminum wire is a conductor, Silicon wafer is a semiconductor, and Glass sheet is an insulator.
Electrical classification defines how easily electrons move through a material's atomic structure.
2
Rank the materials according to their relative ability to conduct electric current from highest to lowest.
Conductor (Aluminum wire) > Semiconductor (Silicon wafer) > Insulator (Glass sheet).
Conductors have freely moving valence electrons, semiconductors have moderate carrier concentrations, and insulators hold their valence electrons tightly to impede electron flow.

Anahtar Kavram

Relative electrical conductivity of conductors, semiconductors, and insulators based on atomic structure.
Tahmini Süre:45s
Soru 35Soru →

A technician is preparing to install a heat-sensitive transistor onto a printed circuit board terminal using an electric soldering pencil and rosin-core solder. What is the correct sequential order of steps the technician must follow to complete the solder connection properly without damaging the component or creating a defective joint?

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Cevap

The proper sequence is: (1) Clean and tin the soldering iron tip on a damp sponge, (2) attach a thermal shunt to the transistor lead, (3) apply the iron tip simultaneously to both the lead and the pad, (4) feed rosin-core solder into the heated junction opposite the iron, and (5) remove the solder, withdraw the iron, and allow the connection to cool undisturbed.
High-reliability electronic soldering follows a strict thermodynamic and metallurgical order: preparing the heat transfer medium (cleaning/tinning), safeguarding delicate active devices with a thermal shunt, heating the target metals to soldering temperature, feeding flux-cored solder directly into the joint to facilitate capillary action, and finally removing the heat source while avoiding physical disturbance during crystallization.

Adım Adım Çözüm

1
Prepare and tin the soldering tip
The tip is free of oxidized residue and coated with a bright, molten solder film.
Tinning creates a liquid solder bridge that dramatically improves heat conductivity into the connection.
2
Position protective thermal tooling
A metallic heat sink clip is fastened between the transistor body and the soldering zone.
Semiconductor junctions can be permanently damaged by excessive heat; the shunt dissipates thermal energy before reaching internal silicone layers.
3
Preheat the connection elements
Both the copper terminal pad and the component lead reach the wetting temperature of solder.
Solder only adheres properly and flows over surfaces that are at or above its liquidus temperature.
4
Introduce solder alloy and flux to the workpiece
Rosin flux cleans surface oxides while molten solder forms a concave wetting fillet around the lead.
Melting solder onto the workpieces rather than directly against the iron tip prevents flux burnout and cold joints.
5
Remove tools and allow undisturbed solidification
The alloy freezes into a shiny, smooth, mechanically sound metallurgical bond.
Moving the joint while the alloy passes through its plastic phase creates a crystallized, high-resistance cold solder joint.

Anahtar Kavram

Procedural stages of electronic soldering, thermal protection, and joint solidification

Alternatif Yöntem

For desoldering rather than soldering, the sequence reverses slightly: clean/tin tip, apply desoldering braid or vacuum pump nozzle to the preheated joint, depress the suction plunger, and verify lead release before component removal.
Tahmini Süre:1m 30s
Soru 36Soru →

An industrial technician is troubleshooting an unpowered control cabinet and needs to measure the electrical resistance of a 24-volt relay coil to determine if the internal winding is defective. What is the correct chronological sequence of steps the technician should follow to perform this measurement safely and accurately?

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Cevap

The technician must first verify the circuit is de-energized, disconnect at least one coil terminal to isolate it from parallel paths, configure the multimeter into resistance mode with correct lead placement, apply the test probes across the coil terminals, and finally compare the resulting reading against manufacturer specifications.
The correct procedural order begins with personal and equipment safety by de-energizing the circuit, followed by component isolation to eliminate parallel resistance paths. Next, the multimeter is properly configured with leads in COM and V/Ω\Omega ports on the resistance setting. The probes are then placed across the terminals to obtain a reading, and the sequence finishes by comparing the measured value to the manufacturer's technical specifications.

Adım Adım Çözüm

1
Ensure all power to the system is shut down and locked out.
The control circuit is fully de-energized and safe for ohmmeter connection.
Ohmmeter circuits inject their own small reference current; measuring on a live circuit will blow meter fuses or cause severe damage.
2
Disconnect at least one conductor from the relay coil terminals.
The relay coil is electrically isolated from any parallel components.
Parallel circuit paths provide alternative routes for test current, resulting in false, lower-than-actual resistance readings.
3
Connect the black lead to COM, red lead to V/Ω\Omega, and turn the dial to the Ω\Omega range.
The meter is correctly set up to inject reference current and compute resistance from voltage drop.
Placing leads in current (A/mA) jacks or selecting incorrect functions causes measurement failure or errors.
4
Apply probe tips firmly to the two coil terminals and wait for a stable reading.
The multimeter displays the true resistance of the coil winding.
Firm probe pressure minimizes contact resistance and ensures accurate measurement.
5
Evaluate the measured resistance relative to published technical data.
Accurate diagnostic determination of whether the coil is operational, shorted (near 0 Ω0\ \Omega), or open (OL).
A reading matching nominal specifications indicates a good coil, while significant deviations indicate faults.

Anahtar Kavram

Multimeter resistance testing requires a strictly ordered procedure: de-energizing power for safety, isolating the component to eliminate parallel paths, configuring proper meter settings, taking the measurement, and comparing results with specifications.
Tahmini Süre:1m 0s
Soru 37Soru →

An electrician is joining two solid copper conductors to form a pigtail splice using standard electrical hand tools. What is the correct sequence of steps to complete this connection?

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Cevap

The correct sequence is: Strip the insulation with wire strippers, align the bare ends with lineworker pliers, twist the conductors clockwise into a tight spiral, trim the twisted tips flush with the plier cutting blades, and thread a twist-on wire connector over the splice.
The correct procedure begins with stripping the outer insulation to expose clean copper. The bare ends are then aligned and twisted clockwise with lineworker pliers to establish a secure mechanical bond. Trimming any uneven ends ensures the splice fits fully inside the twist-on wire connector, which is screwed on last to provide electrical insulation.

Adım Adım Çözüm

1
Strip wire insulation
Clean bare copper conductors are exposed without nicking the metal.
Removing insulation is the mandatory first step to establish electrical conductivity.
2
Align and hold bare ends with lineworker pliers
The two conductors are positioned parallel in the plier jaws.
Even alignment ensures uniform tension and twisting across both wires.
3
Twist conductors clockwise
A tight, solid mechanical twist is formed.
Provides mechanical strength and prevents loose contacts under thermal cycling.
4
Trim the splice tip flush
The twisted conductors end at an equal length.
Prevents exposed bare copper from protruding past the connector housing.
5
Install the twist-on wire connector
The joint is mechanically locked and electrically insulated.
Encloses the bare connection to prevent short circuits and shock hazards.

Anahtar Kavram

Proper operational procedure for creating a mechanical pigtail wire splice using hand tools
Tahmini Süre:45s
Soru 38Soru →

An electronics technician is troubleshooting an inoperative single-phase ventilation blower that fails to operate when energized. In what sequence should the technician perform the following diagnostic and repair actions to follow standard, safe troubleshooting procedures from initial assessment to final verification?

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Cevap

The correct logical sequence is: verify supply voltage at the input terminals, measure the voltage drop across the closed control switch, de-energize and lock out the power source, isolate and measure motor winding resistance with an ohmmeter, and finally replace the defective motor and test operation.
Standard electrical troubleshooting begins with verifying the source power, followed by live circuit voltage checks across active control elements. Once the faulty branch or load is localized, the circuit must be safely de-energized before isolating components for resistance testing. The final step is component replacement followed by an operational verification test.

Adım Adım Çözüm

1
Check the input power supply with a voltmeter.
Confirms whether electrical power is reaching the system.
Eliminates external power failure or tripped upstream breakers before diagnosing internal faults.
2
Check the closed control switch for voltage drop under live conditions.
Determines if the switch contacts are conducting correctly (0 V0\text{ V} drop across good closed contacts; full source voltage across open contacts).
Allows quick live-circuit localization of series circuit faults.
3
Disconnect and lock out the circuit power.
De-energizes the system to establish an electrically safe work condition.
Essential for personnel safety and required before using an ohmmeter, which can be damaged by live voltage.
4
Isolate one winding terminal and measure resistance using an ohmmeter.
Provides an accurate internal resistance reading (infinite ohms indicating an open winding).
Isolating one lead prevents parallel circuit paths from yielding false resistance readings.
5
Replace the faulty motor and restore power to test the unit.
Restores system operation and validates that the root fault is fully resolved.
Every repair procedure concludes with an operational check under normal load conditions.

Anahtar Kavram

Logical Troubleshooting and Safety Sequence
Tahmini Süre:1m 30s
Soru 39Soru →

A standard automotive piston engine relies on a continuous four-stage operating sequence to convert fuel energy into mechanical power. Arrange the following four strokes in the correct chronological order of operation, starting from the introduction of fresh charge into the cylinder.

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Intake stroke → Compression stroke → Power stroke → Exhaust stroke
The four-stroke engine cycle operates in the strict sequential order of Intake, Compression, Power, and Exhaust. The intake stroke pulls the air-fuel mixture into the cylinder, the compression stroke squeezes the mixture with both valves closed, the power stroke harnesses burning gases to drive the piston down, and the exhaust stroke pushes spent gases out through the open exhaust valve to reset the cylinder.

Adım Adım Çözüm

1
Identify the introductory stroke of the four-stroke cycle
The intake stroke begins the cycle as the descending piston creates low pressure to draw in the air-fuel mixture through the open intake valve.
Combustion requires an air-fuel charge inside the cylinder before any subsequent mechanical operation can take place.
2
Determine the preparation stroke preceding ignition
The compression stroke follows as the rising piston compresses the trapped mixture against closed valves.
Compressing the air-fuel mixture elevates pressure and temperature, maximizing combustion efficiency when ignited.
3
Identify the energy-producing power phase
The power stroke takes place when ignition forces the piston downward to deliver mechanical torque to the crankshaft.
This is the sole stroke in the four-stroke cycle that generates positive mechanical power.
4
Determine the clearing stroke that concludes the cycle
The exhaust stroke completes the sequence as the piston ascends to push spent combustion gases out through the open exhaust valve.
Evacuating spent exhaust gases clears the cylinder volume so a fresh charge can enter on the next intake stroke.

Anahtar Kavram

Four-stroke internal combustion cycle operating sequence (Intake, Compression, Power, Exhaust)
Tahmini Süre:45s
Soru 40Soru →

In a standard four-stroke spark-ignition engine, mechanical actions inside the cylinder occur in a precise sequence to complete one operating cycle. Arrange the following cylinder events in the correct chronological order, starting from the induction of the fresh charge.

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The correct sequence of events is: 1) The intake valve opens as the piston moves downward to draw in the air-fuel mixture; 2) Both valves seal while the piston moves upward to compress the mixture; 3) The spark plug ignites the mixture, driving the piston downward to produce power; 4) The exhaust valve opens as the piston moves upward to expel the burned exhaust gases.
A four-stroke engine operates strictly in the sequence of intake (piston moves down, intake valve open), compression (piston moves up, both valves closed), power (combustion forces piston down, both valves closed), and exhaust (piston moves up, exhaust valve open). Arranging the cylinder events from intake through exhaust accurately reflects the mechanical cycle.

Adım Adım Çözüm

1
Identify the first stroke of the internal combustion operating cycle.
The intake stroke begins at top dead center with the intake valve open and the piston traveling downward, drawing in the air-fuel charge.
An engine must bring a combustible charge into the cylinder before any compression or combustion can take place.
2
Determine the mechanical event following cylinder charging.
The compression stroke follows as both valves close and the piston moves upward toward top dead center, compressing the mixture into a smaller volume.
Compressing the air-fuel mixture increases thermal efficiency and combustion speed prior to ignition.
3
Identify the working phase resulting from mixture ignition.
The power stroke occurs when the spark plug ignites the compressed charge, creating high-pressure expanding gases that push the piston downward.
This is the only stroke in the four-stroke cycle that produces positive mechanical work to rotate the crankshaft.
4
Determine the concluding event of the four-stroke cycle.
The exhaust stroke concludes the cycle as the exhaust valve opens and the rising piston expels the spent combustion byproducts.
Residual burned gases must be cleared from the cylinder volume before a fresh intake stroke can begin.

Anahtar Kavram

The operational sequence and mechanical events of the four-stroke internal combustion engine cycle (intake, compression, power, exhaust).
Tahmini Süre:1m 0s
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