Assemble And Disassemble

not-available-via-ai

A fuse is the most commonly used protective device because it is designed to protect electrical circuits from overcurrent or short circuits. When the current exceeds the rated value, the fuse melts and breaks the circuit, preventing damage to the circuit or appliances. It acts as a safety measure by interrupting the flow of current in case of any faults or abnormalities, thereby protecting the electrical system from potential hazards.

The essential components of a circuit are the source conducting path and the load. The source conducting path refers to the pathway through which the electric current flows, typically provided by a power source such as a battery or generator. The load is the part of the circuit that consumes the electrical energy, such as a light bulb or motor. These two components are necessary for the circuit to function properly, as the source provides the energy and the load uses it. The other options, inductive reactance, hysteresis loss, and forward bias, are not essential components of a circuit.

The proper procedure in measuring an unknown AC voltage using the VOM as an AC voltmeter is to set the range switch on the highest AC range and then connect the leads to the power source.

not-available-via-ai

not-available-via-ai

not-available-via-ai

The correct answer is "forward bias". This is because in a forward biased diode, the anode is connected to the positive side of the source while the cathode is connected to the negative side. This configuration allows current to flow through the diode, as the positive voltage at the anode repels the majority charge carriers towards the junction, creating a conductive path.

The correct answer is resetting the yoke. Resetting the yoke is the last step in the final adjustment for color purity. The yoke is a coil of wire that controls the movement of the electron beam in a CRT (cathode ray tube) television. Resetting the yoke involves adjusting its position to ensure that the electron beam hits the correct phosphor dots on the screen, resulting in accurate color reproduction. This adjustment is crucial for achieving optimal color purity in the display.

not-available-via-ai

The given answer "electronic type" suggests that the filter capacitor used in a power supply is of the electronic type. This implies that the capacitor is specifically designed for use in electronic circuits and is suitable for filtering and smoothing the output voltage of the power supply. It is important to use an electronic type capacitor in a power supply to ensure proper functioning and reliable performance of the circuit.

The opposition to the flow of alternating current (a.c.) offered by a coil is called inductive reactance. Inductive reactance is a property of inductors, which are passive electronic components that store energy in a magnetic field. When a.c. flows through an inductor, it creates a changing magnetic field, which induces a voltage that opposes the current flow. This opposition is known as inductive reactance and is measured in ohms. It is caused by the self-inductance of the coil and is dependent on the frequency of the alternating current.

A signal generator is an instrument used to provide signal input for testing and aligning purposes. It generates electrical signals of various types and frequencies, which can be used to test and calibrate electronic devices, circuits, and systems. It is commonly used in fields such as telecommunications, electronics, and research laboratories. An oscilloscope, on the other hand, is a device used to visualize and analyze electrical waveforms. While a tester is a general term that can refer to various instruments used for testing purposes, and a ball chart is not a commonly known instrument in this context.

The 75 ohm coaxial cable is the correct answer because it is specifically designed for transmitting and receiving high-frequency signals, such as those used in television and radio broadcasting. This type of cable has low signal loss and impedance matching properties, which allows for efficient signal transmission and reception. The other options, silicon grease, antenna system, and RF amplifier, may play a role in the overall reception quality, but the 75 ohm coaxial cable is essential for optimal signal reception.

The correct answer is RF amplifier transistor / Antenna system / Balunco. This answer suggests that the channel reception may be snowy due to issues with the RF amplifier transistor, antenna system, or balunco. These components are crucial for receiving and amplifying the radio frequency signals, and if any of them are faulty or not properly connected, it can result in poor reception quality, leading to a snowy picture on the television.

The correct answer is spindle motor. The disk-drive mechanism in a CD player uses a spindle motor to rotate the CD at a high speed. This motor is responsible for spinning the CD and allowing the laser to read the data stored on it. Without the spindle motor, the CD player would not be able to function properly.

The correct answer is printed circuit or wiring. This is because a printed circuit or wiring refers to the interconnection of ICs and other electronic components through pathways of conductive materials that are etched onto a rigid surface. This allows for the efficient flow of electrical signals between components and helps in the proper functioning of electronic devices.

The limited core in transformers is used to minimize hysteresis loss. Hysteresis loss occurs due to the continuous reversal of magnetization in the core material, resulting in energy loss. By using a limited core, the amount of core material subject to magnetization reversal is reduced, thereby minimizing hysteresis loss.

The correct answer is A half wave rectifier circuit /full wave rectifier circuit /bridge wave bridge type rectifier. In a semiconductor rectifier, any of these three types of rectifier circuits can be used depending on the specific requirements of the application. The choice of rectifier circuit is determined by factors such as the desired output voltage and current, efficiency, cost, and the type of load being driven.

Rosin core solder is the commonly used soldering material for electronics assembly. It contains a flux core made of rosin, which helps to remove oxidation and impurities from the solder joint, ensuring a strong and reliable connection. The flux also promotes better wetting and flow of the solder, making it easier to work with. This type of solder is widely used in electronics because it provides good electrical conductivity and is suitable for a variety of applications, including circuit board assembly and component soldering.

not-available-via-ai

When measuring current in a circuit, the voltmeter (vom) should be connected in series with the circuit where the current is to be determined. This is because in a series circuit, the same current flows through all the components, so by connecting the voltmeter in series, it can measure the exact current passing through that specific point in the circuit.

A capacitor is an electronic component that is commonly used to filter out or remove ripples in the power supply output. It acts as a storage device for electrical energy and can release this energy when needed to smooth out fluctuations in voltage. By storing and releasing energy, a capacitor helps to stabilize the power supply output and ensure a more consistent and reliable flow of electricity.

When the high voltage is cut off, it means that the voltage supplied to the anode is reduced or stopped completely. This can result in an increase in brightness because the anode voltage is responsible for accelerating electrons towards the screen, which in turn creates the image. When the voltage is cut off, the electrons are not accelerated as strongly, leading to a brighter image. This method is applied to prevent the anode voltage from exceeding its recommended level, which could potentially cause damage to the cathode or other components.

Side cutter pliers are not advisable for electronics assembly and repair work because they can cause damage to delicate components. These pliers have a cutting edge on one side, which can easily cut through wires and leads, but can also accidentally cut other nearby components or cause short circuits. Therefore, it is recommended to use specialized tools like wire strippers or precision cutters that are designed specifically for electronics work to ensure accuracy and avoid any potential damage.

CFC free soldering is the type of soldering that is used in compliance with the direction of reduction of hazardous substances. This means that CFC free soldering does not contain any Chlorofluorocarbons, which are harmful to the environment and contribute to ozone depletion. Using CFC free soldering helps to reduce the release of these hazardous substances into the environment, making it a more environmentally friendly option.

The function of the rectifier diode in a super hetero dyne is to amplify the audio signal. The rectifier diode is responsible for converting the alternating current (AC) signal into a direct current (DC) signal, which is then amplified to produce the audio signal. This allows for the amplification and transmission of the audio signal in the super hetero dyne system.

not-available-via-ai

Infinite resistance is not a sign of a short circuit because a short circuit typically occurs when there is little to no resistance in a circuit, causing a large current to flow. In contrast, infinite resistance indicates an open circuit, where there is a break in the circuit and no current can flow. Therefore, infinite resistance is not a sign of a short circuit.

The question is asking about the most important thing to know about the vom (volt-ohm-milliammeter). Out of the given options, meter sensitivity is the most crucial aspect to consider when using a vom. Meter sensitivity refers to the ability of the meter to detect and measure small changes in voltage, resistance, or current. A higher sensitivity means that the meter can accurately measure even the smallest changes, making it an essential factor in obtaining accurate readings.

Cathode burn refers to damage to the cathode of a CRT (cathode ray tube) display. This damage cannot be repaired except by replacing the entire CRT. This explanation suggests that the other options (convergence yoke, resetting the yoke, shunt bypass capacitor) are not the correct answer because they do not pertain to the specific issue of cathode burn.

To improve the sound of a small capacitor, a capacitor with a value of .01 uf should be connected across the primary winding of the output transformer in treble circuit designs.

When capacitors are placed in parallel, the total capacitance is equal to the sum of the individual capacitances. In this case, the 0.001 microfarad capacitor is equivalent to 1000 pf (since 1 microfarad is equal to 1000 pf), and when it is placed in parallel with the 100 pf capacitor, the total capacitance is the sum of these two values, which is 1100 pf.

The correct answer is infinite resistance. This is because a short circuit occurs when there is a direct connection between the positive and negative terminals of a power source, bypassing the load. In this case, the resistance is so high that it approaches infinity, meaning that no current can flow through the circuit. Therefore, infinite resistance should not be included as a sign of a short circuit.

An oscilloscope is an instrument used to measure peak and peak voltage and to show the shape of a voltage. It is commonly used in electronics and electrical engineering to visualize electrical waveforms. With its graphical display, it allows users to analyze and troubleshoot circuits by observing the amplitude, frequency, and time characteristics of electrical signals.

The correct answer is v=h deflection yoke. The v=h deflection yoke is responsible for adjusting the electron beams in a cathode ray tube (CRT) display. By properly setting the beam landing adjustment, the electron beams can be accurately aimed and positioned on the screen. This ensures that the image displayed on the CRT is clear and properly aligned. The other options mentioned, such as cathode burn, resetting yoke, and rosin-core soldier, do not relate to the adjustment of electron beams in a CRT display.

The convergence yoke is responsible for adjusting the beams of different colors to converge on the screen. It has individual adjustments for each color, allowing precise alignment and convergence of the beams. This ensures that the colors appear properly aligned and there is no color fringing or blurring on the screen. The convergence yoke is an essential component in CRT displays and helps in achieving accurate color reproduction.

The number 2 in the given code refers to the number of effective junctions. In electronic circuits, junctions are points where different components are connected together. The number of junctions affects the behavior of the circuit and can determine how current flows through it. Therefore, the number 2 in the code indicates that there are two effective junctions in the circuit.

The given answer "cable television system" is the correct answer because the terms "head end," "trunk line," "trunk amplifier," "distribution," and "subscriber" are all components or stages of a cable television system. The head end is where the television signals are received and processed, the trunk line is the main cable that carries the signals, the trunk amplifier boosts the signal strength, distribution refers to the branching of the signal to different areas, and subscribers are the end users who receive the television signals through their cable connections. Therefore, the correct answer is a cable television system.

A sweep marker generator and oscilloscope can be used to align the if and rf circuits of a television receiver visually. The sweep marker generator generates a sweep signal that is fed into the if and rf circuits, while the oscilloscope displays the output waveform. By adjusting the circuits until the waveform on the oscilloscope is aligned and stable, the if and rf circuits can be properly calibrated for optimal performance.

The range of the scale should be set to R x 100 when testing a low power transistor with an ohmmeter. This is because a low power transistor typically has a low resistance value, and setting the scale to R x 100 allows for more accurate measurement within the expected range of resistance values for the transistor. Setting the scale too low (R x 1) may result in the resistance value exceeding the range of the meter, while setting it too high (R x 1000) may not provide enough precision for accurate measurement.

Silicon grease is the best option for assuring good thermal contact between a power transistor and its heat sink. This is because silicon grease has high thermal conductivity and can fill in any gaps or imperfections between the transistor and the heat sink, allowing for efficient heat transfer. It also provides electrical insulation, preventing any short circuits. Wire, silicon paste, and soldering lead are not suitable for this purpose as they do not have the same thermal conductivity and may not provide a secure and efficient thermal contact.

The most important consideration when connecting an electrolytic capacitor in a circuit is its polarity. Electrolytic capacitors are polarized components, meaning they have a positive and negative terminal. If they are connected with the wrong polarity, they can become damaged or even explode. Therefore, it is crucial to correctly identify the positive and negative terminals of the capacitor and connect them accordingly in the circuit.

A transistor is not a basic component of a typical low voltage power supply. In a low voltage power supply, basic components typically include a transformer, rectifier, filter capacitor, and voltage regulator. A transistor is a semiconductor device used for amplification or switching purposes, and it is not directly involved in the basic functioning of a power supply.

The dull and crunchy soldering joints are likely due to a faulty soldering tip. The tip is the part of the soldering iron that comes into direct contact with the solder and the joint being soldered. If the tip is worn out, dirty, or not properly heated, it can result in poor soldering joints. A dull and crunchy joint indicates that the solder did not properly flow and adhere to the surface, which can be caused by a malfunctioning or inadequate soldering tip.

When a transistor is checked or tested with a vom (volt-ohm meter), the highest resistance is observed between the emitter and collector. This is because the emitter and collector are the two main terminals of a transistor, and there is no direct current flow between them in normal operation. The base terminal controls the flow of current between the emitter and collector, so when the transistor is not conducting, the resistance between the emitter and collector is at its highest.

A shunt bypass capacitor is commonly used in treble output circuits to reduce the output at high frequencies. It acts as a low impedance path for high-frequency signals, bypassing them to the ground and preventing them from reaching the output. This helps in attenuating the treble frequencies and achieving a desired frequency response in the circuit.

The given resistor is coded with brown, green, yellow, and gold stripes from left to right. The first digit brown represents 1, the second digit green represents 5, the third digit yellow represents 4, and the gold stripe represents a tolerance of 5%. Therefore, the value of the resistor is 154 with a tolerance of 5%. The answer option that matches this value and tolerance is 150,00+-5 percent.

A dry cell is a device that can be installed or connected to a radio receiver to provide the necessary power. It is a type of battery that uses a paste electrolyte instead of a liquid, making it more convenient and portable.

The correct answer is the circuit diagram with the switch connected to the voltmeter (V), the resistor (R) connected in parallel to the voltmeter, and the voltmeter connected to the fuse, which is then connected back to the switch. This configuration allows the AC voltmeter to accurately measure the voltage output of the generator by providing a proper path for the current to flow through the voltmeter and the resistor.