Home/ Jemshah/Best Answers
  1. Asked: December 19, 2022In:

    tests carried out on a completed solar electric installation

    Jemshah Enlightened

    Visual inspection: This involves inspecting the physical components of the system, such as the solar panels, inverters, and wiring, to ensure that they are properly installed and in good condition. Voltage and current measurement: This involves measuring the voltage and current output of the solar pRead more

    1. Visual inspection: This involves inspecting the physical components of the system, such as the solar panels, inverters, and wiring, to ensure that they are properly installed and in good condition.
    2. Voltage and current measurement: This involves measuring the voltage and current output of the solar panels and other components of the system to ensure that they are operating within the specified range.
    3. Insulation resistance testing: This involves measuring the resistance of the insulation on the wires and cables in the system to ensure that it is sufficient to prevent electrical shocks and other hazards.
    4. Earthing resistance testing: This involves measuring the resistance of the earthing system to ensure that it is sufficient to protect against electrical shocks and other hazards.
    5. Continuity testing: This involves checking the continuity of the wiring and cables in the system to ensure that there are no breaks or faults.
    6. Functionality testing: This involves testing the operation of the system under various conditions to ensure that it is functioning properly.
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  2. Asked: December 19, 2022In:

    reasons for earthing of a PV solar module

    Jemshah Enlightened

    Safety: Earthing helps to protect against electrical shocks and other hazards by providing a safe path for electrical currents to flow in the event of a fault or short circuit. Surge protection: Earthing can help to protect against voltage surges and lightning strikes, which can damage or destroy PVRead more

    1. Safety: Earthing helps to protect against electrical shocks and other hazards by providing a safe path for electrical currents to flow in the event of a fault or short circuit.
    2. Surge protection: Earthing can help to protect against voltage surges and lightning strikes, which can damage or destroy PV solar modules and other components of the system.
    3. Ground fault protection: Earthing helps to detect and interrupt ground faults, which are dangerous and can cause damage to the system.
    4. Improved performance: Earthing can help to improve the performance of a PV solar module by reducing electrical noise and interference.
    5. Compliance with codes and standards: In many cases, earthing is required by codes and standards to ensure the safety and reliability of PV solar systems. Overall, earthing is an important aspect of PV solar module installation and maintenance, and is essential for ensuring the safety, performance, and longevity of the system.
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  3. Asked: December 19, 2022In:

    explain the function of i. switches ii. lamps as in solar installations

    Jemshah Enlightened

    i. Switches: In a solar installation, switches are used to control the flow of electricity. They can be used to turn the system on or off, or to switch between different components in the system. For example, a switch might be used to turn a solar panel array on or off, or to switch between a batterRead more

    i. Switches:

    In a solar installation, switches are used to control the flow of electricity. They can be used to turn the system on or off, or to switch between different components in the system. For example, a switch might be used to turn a solar panel array on or off, or to switch between a battery bank and the grid.

    ii. Lamps:

    Lamps are used to provide lighting in a solar installation. They may be connected to a solar panel array or a battery bank, and can be turned on or off using switches or other control devices. Lamps can be used to provide general lighting, task lighting, or accent lighting, depending on the needs of the installation.

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  4. Asked: December 19, 2022In:

    list four types of i. cable joints ii. wiring systems

    Jemshah Enlightened

    i. Cable joints: Mechanical splice Compression joint Crimp joint Soldered joint ii. Wiring systems: Series wiring Parallel wiring Series-parallel wiring Multiconductor wiring

    i. Cable joints:

    1. Mechanical splice
    2. Compression joint
    3. Crimp joint
    4. Soldered joint

    ii. Wiring systems:

    1. Series wiring
    2. Parallel wiring
    3. Series-parallel wiring
    4. Multiconductor wiring
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  5. Asked: December 18, 2022In:

    describe the entrance facilities of a structured cabling

    Jemshah Enlightened

    Demarcation point: This is the point at which the responsibility for the cabling system shifts from the telecommunications provider to the building owner or tenant. It is typically located at the point where the telecommunications cables enter the building. Cross-connect: This is a patch panel or otRead more

    1. Demarcation point: This is the point at which the responsibility for the cabling system shifts from the telecommunications provider to the building owner or tenant. It is typically located at the point where the telecommunications cables enter the building.
    2. Cross-connect: This is a patch panel or other device that is used to connect the telecommunications cables to the internal cabling system. It allows for the easy reconfiguration of the cabling system as needed.
    3. Cable management: This includes racks, trays, and other devices that are used to organize and support the cables as they enter the building.
    4. Cable termination: This refers to the process of attaching connectors to the ends of the cables. This may be done using punch-down blocks, connectors, or other methods.
    5. Testing equipment: This includes testers and other tools that are used to verify the performance and integrity of the cabling system.
    6. Environmental controls: This may include air conditioning, humidity control, and other measures to ensure that the entrance facilities are maintained at a suitable temperature and humidity level.
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  6. Asked: December 18, 2022In:

    Distinguish between an ammeter and a voltmeter when connected in a circuit

    Jemshah Enlightened

    An ammeter is an instrument that is used to measure the flow of electric current in a circuit. It is typically connected in series with the load in a circuit, so that the current flowing through the ammeter is the same as the current flowing through the circuit. A voltmeter, on the other hand, is anRead more

    An ammeter is an instrument that is used to measure the flow of electric current in a circuit. It is typically connected in series with the load in a circuit, so that the current flowing through the ammeter is the same as the current flowing through the circuit.

    A voltmeter, on the other hand, is an instrument that is used to measure the voltage difference between two points in a circuit. It is typically connected in parallel with the load in a circuit, so that it does not interfere with the flow of current through the circuit.

    One key difference between an ammeter and a voltmeter is the amount of current that they are designed to handle. An ammeter is typically designed to handle relatively large currents, while a voltmeter is designed to handle very small currents. This is because an ammeter must be able to measure the current flowing through the circuit without significantly affecting it, while a voltmeter must be able to measure the voltage difference without drawing too much current from the circuit.

    Another key difference between an ammeter and a voltmeter is the type of movement that they use to indicate the measurement. An ammeter typically uses a moving coil movement, while a voltmeter typically uses a moving magnet movement.

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  7. Asked: December 18, 2022In:

    describe a fire alarm system

    Jemshah Enlightened

    A fire alarm system is a safety system that is designed to detect the presence of fire and alert building occupants and emergency responders. It typically consists of the following components: Sensors: These are devices that detect the presence of fire and send a signal to the control panel when actRead more

    A fire alarm system is a safety system that is designed to detect the presence of fire and alert building occupants and emergency responders. It typically consists of the following components:

    1. Sensors: These are devices that detect the presence of fire and send a signal to the control panel when activated. There are several types of sensors that can be used in a fire alarm system, including smoke detectors, heat detectors, and flame detectors.
    2. Control panel: This is the central hub of the fire alarm system, which receives signals from the sensors and initiates the alarm. The control panel may also be equipped with a display that shows the location of the fire and other relevant information.
    3. Alarm devices: These are devices that are activated by the control panel and serve to alert building occupants and emergency responders to the presence of a fire. Examples of alarm devices include bells, horns, and strobe lights.
    4. Communication devices: These are devices that are used to send signals to the control panel and to communicate with emergency responders. Examples of communication devices include hardwired or wireless transmitters, modems, and telephone interfaces.
    5. Power supply: This is the source of power for the fire alarm system. It may be supplied by the building’s electrical system, or it may have a separate backup power source such as a battery.

    In addition to these components, a fire alarm system may also include manual pull stations, sprinkler systems, and other features that are designed to help prevent or control fires. It is important to regularly test and maintain a fire alarm system to ensure that it is in proper working order.

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  8. Asked: December 18, 2022In:

    state three methods of charging batteries

    Jemshah Enlightened

    Constant current charging: This method involves applying a constant current to the battery until it is fully charged. The voltage of the battery will increase as it charges, until it reaches the maximum voltage at which point the current will begin to taper off. Constant voltage charging: This methoRead more

    1. Constant current charging: This method involves applying a constant current to the battery until it is fully charged. The voltage of the battery will increase as it charges, until it reaches the maximum voltage at which point the current will begin to taper off.
    2. Constant voltage charging: This method involves applying a constant voltage to the battery until it is fully charged. The current flowing through the battery will decrease as it charges, until it reaches a minimum level at which point the charging process is complete.
    3. Pulse charging: This method involves applying short bursts of high current to the battery, followed by periods of no current. This can help to reduce the amount of heat generated during the charging process and extend the life of the battery.
    4. Trickle charging: This method involves applying a low, constant current to the battery for an extended period of time. It is typically used to maintain the charge of a battery that is not in use, or to compensate for small amounts of self-discharge.
    5. Solar charging: This method involves using photovoltaic cells to convert sunlight into electricity, which is then used to charge the battery. This is a environmentally friendly and renewable method of charging batteries.
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  9. Asked: December 18, 2022In:

    explain the function of a surge tank in hydro-power station

    Jemshah Enlightened

    A surge tank is a type of hydraulic structure that is used in hydroelectric power plants to absorb sudden changes in water flow and pressure. It is typically located downstream of the turbine and serves to regulate the flow of water through the power plant. The surge tank acts as a buffer, storing eRead more

    A surge tank is a type of hydraulic structure that is used in hydroelectric power plants to absorb sudden changes in water flow and pressure. It is typically located downstream of the turbine and serves to regulate the flow of water through the power plant.

    The surge tank acts as a buffer, storing excess water during periods of high flow and releasing it during periods of low flow. This helps to stabilize the pressure and flow in the system, preventing damage to the turbine and other components of the power plant.

    The surge tank is typically designed to have a large volume and a small surface area to minimize the amount of energy lost through wave action. It may also be equipped with gates or valves to control the flow of water in and out of the tank.

    In addition to providing stability to the system, the surge tank can also help to improve the overall efficiency of the hydroelectric power plant by allowing the turbine to operate at a more constant speed. This can reduce wear and tear on the turbine and improve its efficiency.

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  10. Asked: December 18, 2022In:

    conduit fittings that are used in installation of the conduit

    Jemshah Enlightened

    Couplings: Couplings are used to join two sections of conduit together. They can be used to extend the length of a conduit run or to connect two sections of conduit at an angle. Elbows: Elbows are used to change the direction of a conduit run. They are available in various angles, such as 90 degreesRead more

    1. Couplings: Couplings are used to join two sections of conduit together. They can be used to extend the length of a conduit run or to connect two sections of conduit at an angle.
    2. Elbows: Elbows are used to change the direction of a conduit run. They are available in various angles, such as 90 degrees or 45 degrees, to allow for flexibility in the layout of the conduit system.
    3. Adapter sleeves: Adapter sleeves are used to join two different types or sizes of conduit together. They can be used to connect a smaller diameter conduit to a larger diameter conduit or to connect a conduit made of one material to a conduit made of a different material.
    4. Junction boxes: Junction boxes are used to connect multiple conduit runs together or to provide an access point for electrical wires. They are typically made of metal or plastic and have a removable cover for easy access.
    5. Conduit bodies: Conduit bodies are used to provide access to the interior of a conduit system. They are typically used to connect multiple conduit runs together or to provide a connection point for electrical devices, such as switches or outlets.
    6. Supports: Supports are used to secure conduit to a structure or to hold it in place. They can be used to hold conduit in place on a wall, ceiling, or floor, or to support conduit that is suspended from a ceiling or structure.
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