2A656 CDC Vol 2 April 2012

NiCad batteries use separators made of a material called permion. The separators in a NiCad battery are responsible for preventing direct contact between the positive and negative electrodes, while still allowing the flow of ions. Permion is a specific material that is commonly used for this purpose in NiCad batteries. It is a type of separator that is made of a combination of nylon and cellophane, or sometimes microporous rubber. Metallic cadmium and nickel oxide are not materials used for separators in NiCad batteries.

When a bonding or grounding jumper is insulated, it should have a resistance of no more than 0.1 ohms. This ensures that the jumper provides an effective path for electrical current to flow in the event of a fault or surge, effectively grounding or bonding the system and preventing electrical hazards. A higher resistance could indicate a poor connection or insulation, which could compromise the effectiveness of the jumper in protecting against electrical faults.

When you have a cold solder joint, it means that the solder joint was not properly heated during the soldering process, resulting in a poor connection. This poor connection leads to a high resistance to current flowing through the joint. Therefore, the correct answer is "High resistance to current."

The correct answer is 35C3-2-112-1. This is the technical order (TO) that covers the RF80-K Charger/Analyzer.

To clean a plated soldering tip, it is recommended to use an abrasive cloth while the tip is cold. Using a fine file while the tip is cold or a coarse file while the tip is hot can cause damage to the tip. Similarly, using an abrasive cloth while the tip is hot can also lead to damage. Therefore, using an abrasive cloth while the tip is cold is the correct method for cleaning a plated soldering tip.

A good solder connection should have no pits or holes, indicating that the solder has properly filled the joint and there are no gaps. Additionally, it should have a good concave fillet, which means that the solder has formed a smooth and even curve along the joint, indicating a strong and reliable connection.

In a parallel circuit, the voltage across each branch is the same as the applied voltage. Therefore, the voltage drop across each resistor in this parallel circuit is 12 volts.

To compute capacitance, you need to know the plate area, distance between the plates, and type of dielectric. The plate area determines the amount of charge that can be stored on the plates, while the distance between the plates affects the strength of the electric field between them. The type of dielectric material between the plates determines the ability of the capacitor to store charge. These factors combined determine the capacitance of a capacitor. The size of the plates, voltage applied, and current flow are not directly related to the computation of capacitance.

In an induction motor, the alternating current (AC) power is directly connected to the stator windings. The stator windings are responsible for creating a rotating magnetic field, which induces currents in the rotor and causes it to rotate. The brushes, armature, and commutator are typically associated with direct current (DC) motors, not induction motors.

The series transistor in an electronic voltage regulator acts like a variable resistor. This means that it can adjust the resistance in the circuit, allowing for the regulation of voltage. Unlike a zener diode, which is used to regulate voltage by maintaining a constant voltage drop, or a fixed resistor, which has a fixed resistance value, the series transistor can vary its resistance based on the input signal. Therefore, it is the correct answer in this case.

A properly installed bolt should have a minimum of two threads protruding through the nut. This is important to ensure that the bolt is securely fastened and can withstand the required load. Having at least two threads engaged in the nut provides enough surface area for the bolt to grip and prevents it from loosening or coming undone. It also helps distribute the load evenly across the threads, reducing the risk of thread stripping or failure.

The effective electromotive force (EMF) in a motor is made up of the applied voltage minus the counter-EMF (CEMF). This is because the CEMF is a back electromotive force that opposes the applied voltage in a motor. Therefore, the effective EMF is the difference between the applied voltage and the CEMF.

Transformers in low-frequency circuits require a core of low-reluctance magnetic material. This is because low-frequency circuits require a high level of magnetic flux to be transferred efficiently, and a low-reluctance core allows for this. A low-reluctance core has a high permeability and low magnetic resistance, allowing for a smooth flow of magnetic flux and minimizing energy losses. Therefore, a core of low-reluctance magnetic material is necessary for efficient operation of transformers in low-frequency circuits.

To find the total resistance in a series-parallel circuit, you need to add the total resistance of the parallel part to the total resistance of the series part. This is because in a series-parallel circuit, the resistors are arranged in both series and parallel configurations. The resistors in series add up to a total resistance, and the resistors in parallel can be combined using the formula 1/Rtotal = 1/R1 + 1/R2 + 1/R3 + ... By adding the total resistance of the parallel part to the total resistance of the series part, you get the overall total resistance of the circuit.

To clean tinned, lead-plated circuit boards, a medium-bristle brush and alcohol should be used. This combination is effective in removing dirt and debris from the circuit boards without causing damage. The medium-bristle brush helps to gently scrub the surface, while the alcohol acts as a solvent to dissolve any contaminants. This method ensures that the circuit boards are thoroughly cleaned and ready for use.

The voltmeter indicates the current flowing through a circuit. It measures the flow of electric charge per unit of time, which is known as current. The voltmeter provides a reading that represents the magnitude of the current passing through the circuit.

A rasp is the correct tool to use when filing aluminum or lead. It is a coarse file with sharp teeth that are designed to quickly remove material. The teeth on a rasp are more aggressive than those on other files, making it ideal for working with soft metals like aluminum and lead. The shape and size of the rasp also allow for better control and precision when filing these materials.

During soldering, the proper amount of solder should be applied directly to the connection. This is because the solder is used to create a strong and reliable electrical and mechanical bond between the two components being connected. Applying the solder directly to the connection ensures that it flows and adheres properly, creating a secure joint.

If a circuit board conductor has a nick that extends 25 percent of its width, it must be repaired. This means that if the nick covers a quarter of the width of the conductor, it is considered significant enough to require fixing. Nicks in the conductor can disrupt the flow of electrical current and affect the overall functionality of the circuit board. Therefore, any damage that extends 25 percent of the width should be addressed to ensure proper functioning of the circuit board.

When repairing a damaged terminal on a circuit board, the replacement foil should overlap the connecting circuit conductor by at least 0.125 inch. This overlap ensures a secure and reliable connection between the replacement foil and the conductor, allowing for proper electrical conductivity. A larger overlap helps to prevent any potential gaps or weak points in the connection, reducing the risk of signal loss or circuit failure.

In a parallel circuit, the total resistance is always less than the smallest resistance in the circuit. This is because in a parallel circuit, the total resistance is calculated by taking the reciprocal of the sum of the reciprocals of each individual resistance. Since the reciprocal of a smaller resistance value is larger, adding more of these larger values together will result in a smaller total resistance. Therefore, the total resistance in a parallel circuit is always less than the smallest resistance in the circuit.

The correct answer is that the direction of the arrow on the emitter lead is the difference between the PNP and NPN transistor symbols. In an NPN transistor symbol, the arrow on the emitter lead points outwards, while in a PNP transistor symbol, the arrow on the emitter lead points inwards. This difference in arrow direction helps to distinguish between the two types of transistors.

The surge resistor in a half-wave rectifier limits the peak current. When the diode is conducting, it allows current to flow through it, but the surge resistor limits the amount of current that can flow. This helps to protect the circuit from excessive current and prevents damage to the components.

The correct answer is 6, 60, 600, 1000. This is because these are the four range settings available on the Fluke multimeter.

When joining copper and aluminum terminal lugs together on the same terminal board stud, it is important to separate them with a cadmium-plated washer. This is because copper and aluminum have different properties and can cause galvanic corrosion when they come into direct contact. The cadmium-plated washer acts as a barrier between the two metals, preventing corrosion and ensuring a secure and reliable connection.

The full-wave rectifier is used in both low-voltage and high-voltage circuits. This is because it is capable of converting alternating current (AC) into direct current (DC) regardless of the voltage level. The full-wave rectifier uses a bridge rectifier configuration, which allows it to rectify the AC signal from the input voltage source. This makes it suitable for a wide range of applications, from low-voltage circuits to high-voltage circuits.

The A510A load bank is designed to apply both resistive loads in kilowatts (kW) and reactance loads in kilo volt ampere reactance (kVAR). The correct answer is 67.5 kW or 45 kVAR, which means that the load bank can handle a resistive load of up to 67.5 kW and a reactance load of up to 45 kVAR.

After a circuit board has cooled down, it is important to clean the circuit board connection within 90 minutes. This is because during the cooling process, dust, dirt, or other contaminants may settle on the board, which can potentially cause issues with the circuit's performance or functionality. Cleaning the board within this timeframe ensures that any potential contaminants are removed, allowing for optimal circuit performance.

Unclinched-lead terminations are of the special type.

When a component in a series-parallel circuit is shorted, it creates a path of very low resistance or zero resistance. This means that the current will flow through the shorted component without any hindrance, resulting in a lower than normal or zero reading on the ohmmeter.

The heaviest duty soldering iron that is normally used in soldering a printed circuit board is 27 watts. This wattage is higher than the 20 watts option, indicating that it can generate more heat and is therefore more suitable for soldering tasks. However, it is lower than the 30 watts and 35 watts options, suggesting that these higher wattage soldering irons may be too powerful for soldering delicate circuit boards. Therefore, the 27 watts option strikes a balance between providing enough heat for soldering while still being suitable for delicate electronic components.

When soldering a module-type package to a printed circuit board, it is important to ensure that the connection is soldered within 5 seconds. This time frame is crucial to ensure that the solder properly bonds the package to the circuit board and creates a reliable and secure connection. Soldering for too short a time may result in a weak connection, while soldering for too long may cause damage to the components or the board. Therefore, soldering within 5 seconds is the optimal time frame for this process.

The right hand rule for motors is used to determine the direction in which a current-carrying conductor will move in a magnetic field. By pointing the thumb of the right hand in the direction of the current and curling the fingers towards the magnetic field, the direction of motion can be determined. This rule is specifically applicable to motors, where the interaction between the magnetic field and the current produces motion.

A glass tube is used to check the electrolyte level in a nickel-cadmium (NiCad) battery. The glass tube allows for a visual inspection of the electrolyte level, making it easy to determine if the level is too low or too high. This is important because maintaining the correct electrolyte level is crucial for the battery's performance and longevity. By using a glass tube, one can easily monitor and adjust the electrolyte level as needed.

Uniform etch corrosion is a result of a direct chemical attack. In this type of corrosion, the entire surface of the metal is uniformly attacked by a corrosive agent, leading to a gradual and even removal of material. This can occur when the metal is exposed to aggressive chemicals or environments that can dissolve or react with the metal surface. Unlike other types of corrosion, uniform etch corrosion does not involve electrochemical reactions or the formation of galvanic cells. Instead, it is solely driven by the chemical reaction between the metal and the corrosive agent.

To connect wires or component leads to flat perforated terminals, the wrap must be 180 degrees. This means that the wire or component lead should be wrapped around the terminal in a complete circle, forming a 180-degree angle. This ensures a secure and reliable connection between the wire/lead and the terminal, minimizing the risk of disconnection or poor conductivity.

To desolder a component from a printed circuit board, it is best to hold the board vertically. Holding the board vertically allows the heat from the soldering iron to flow downwards, preventing any damage to nearby components or the board itself. This position also helps in ensuring that the soldered joint is heated evenly, making it easier to remove the component without causing any damage. Holding the board flat, horizontally, or at a 45-degree angle may result in uneven heating and potential damage to the board or other components.

The correct answer is "one that is vibrating the most". When multiple reeds are vibrating, the one that is vibrating the most is the one with the highest amplitude. The amplitude of a vibrating object determines the intensity or strength of the vibration. Therefore, by observing which reed is vibrating with the highest amplitude, we can determine which vibrating reed frequency meter reading is correct.

When an electronic voltage regulator's input voltage first increases, the series transistor bias decreases. This means that the current flowing through the series transistor decreases. As a result, the voltage across the load also decreases. This is because the decrease in series transistor bias reduces the current flowing through the load, leading to a decrease in the voltage across it.

A larger terminal symbol on a polarized connector indicates the ground side of the circuit. This means that the larger terminal is connected to the ground or earth, which is a reference point for electrical potential in a circuit. It is important to correctly identify and connect the ground side of a circuit to ensure proper functioning and safety.

The common collector configuration is the only one among the given options where the input and output signals are in phase. In this configuration, the input signal is applied to the base terminal and the output is taken from the collector terminal. The emitter terminal is common to both the input and output circuits. This configuration is also known as an emitter follower, and it provides high voltage gain and low current gain.

If there is an open leg or branch in a parallel circuit, it means that the current is not flowing through that specific part of the circuit. Therefore, the ammeter connected in series with the whole circuit will display a low amperage reading because the current passing through the circuit is reduced due to the open branch.

The X-1A thermoswitch tester has a medium position that is suitable for testing switches with a Fahrenheit range of 700-1000 degrees. This means that the tester is designed to accurately measure the functionality of switches within this temperature range. Using the medium position ensures that the tester is set at an appropriate sensitivity level to detect any issues or malfunctions in the switches operating within this specific temperature range.

To apply a reactive load to a generator under test, it is necessary to load a power factor. This means that the load being applied should have both a resistive and reactive component. Reactive loads are used to simulate real-world conditions and test the generator's performance under different power factors. By loading a power factor, the generator can be evaluated for its ability to handle both resistive and reactive loads efficiently.

The thermoswitch tester is capable of checking switches within a Fahrenheit range of 200-1000 degrees. This means that it can accurately measure and test switches that operate within this temperature range. It is important for the tester to have a wide range of temperature capabilities in order to effectively assess the functionality and performance of the switches.

When using a voltmeter to check a circuit for an open in a direct current (DC) circuit, it is important to observe polarities in the circuit. This is because the voltmeter measures the voltage difference between two points in the circuit, and the polarity of the voltmeter leads must be aligned with the polarity of the circuit to obtain an accurate reading. If the polarities are not observed, the voltmeter may give incorrect readings or even damage the circuit. Therefore, observing the polarities ensures that the voltmeter is properly connected and the measurement is accurate.

When two equal resistors are connected in series, the total resistance of the circuit is equal to the sum of the individual resistances. In this case, since one of the resistors is open (meaning it has infinite resistance), the total resistance of the circuit will also be infinite. However, when a voltmeter is connected across an open resistor, it does not draw any current, and therefore does not affect the circuit. As a result, the voltmeter will read the voltage applied across the circuit, which is the same as the applied voltage.

A polyethylene wash bottle is used to adjust the electrolyte level in a nickel-cadmium (NiCad) battery. This type of wash bottle is commonly used in laboratories and is made of a durable plastic material that is resistant to chemicals. The wash bottle allows for controlled dispensing of fluids, making it suitable for adding or removing electrolyte solution from the battery. The use of a polyethylene wash bottle ensures that the electrolyte level can be adjusted accurately and safely without the risk of contamination or damage to the battery.

Electricity does not create or destroy energy. It is a form of energy that is generated from various sources such as fossil fuels, nuclear power, or renewable sources like solar or wind. Once generated, electricity can be transferred to different locations for various purposes such as powering appliances, lighting, or operating machinery. Therefore, the correct answer is that the basic function of electricity is to develop or generate energy.

In a circuit with both coils and capacitors, voltage and current will be out of phase. This means that the voltage and current waveforms will not align with each other. The current waveform will lag or lead the voltage waveform by a certain angle, indicating that they are not occurring simultaneously. This phase difference is due to the reactive components (inductance and capacitance) in the circuit, which cause the voltage and current to behave differently.