Home/Electrical Measurement (EMFD)/Page 2
  1. Asked: December 19, 2022In:

    explain the function of the following tools when used for maintenance i. desoldering pump, ii. long nose pliers, iii. logic probe (july 2019)

    Best Answer
    Jemshah Enlightened

    i. Desoldering pump: A desoldering pump, also known as a soldering iron, is a tool used to remove solder from electronic components and circuit boards. It consists of a heating element and a plunger that is used to suck up the molten solder. The desoldering pump is often used during maintenance to rRead more

    i. Desoldering pump:

    A desoldering pump, also known as a soldering iron, is a tool used to remove solder from electronic components and circuit boards. It consists of a heating element and a plunger that is used to suck up the molten solder. The desoldering pump is often used during maintenance to remove faulty or damaged components from circuit boards, or to repair connections that have become loose or broken.

    ii. Long nose pliers:

    Long nose pliers are a type of hand tool with long, pointed jaws that are used for gripping and manipulating small objects. They are often used during maintenance to reach into tight spaces or to hold and position components.

    iii. Logic probe:

    A logic probe is a testing tool used to test digital electronic circuits. It consists of a probe with a light or sound indicator that is used to test the state of a circuit. The logic probe is often used during maintenance to troubleshoot and diagnose problems in digital circuits. It can be used to determine if a circuit is in a high or low state, or to identify fault conditions such as open or shorted circuits.

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  2. Asked: December 19, 2022In:

    effects of each of the following on the reliability of an equipment. i. high temperatures; ii. mechanical vibrations and shock (july 2019)

    Best Answer
    Jemshah Enlightened

    i. High temperatures: High temperatures can have a negative effect on the reliability of equipment. High temperatures can cause materials to expand and contract, leading to mechanical stress and strain on the equipment. High temperatures can also cause components to degrade or fail prematurely, leadRead more

    i. High temperatures:

    High temperatures can have a negative effect on the reliability of equipment. High temperatures can cause materials to expand and contract, leading to mechanical stress and strain on the equipment. High temperatures can also cause components to degrade or fail prematurely, leading to reduced reliability.

    ii. Mechanical vibrations and shock:

    Mechanical vibrations and shock can also have a negative effect on the reliability of equipment. Vibrations and shock can cause mechanical stress and strain on the equipment, leading to wear and tear and increased risk of failure. Vibrations and shock can also cause components to become loose or misaligned, leading to reduced reliability.

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  4. Asked: December 19, 2022In:

    distinguish between reliability and failure with respect to an engineering system (july 2019)

    Best Answer
    Jemshah Enlightened

    Reliability refers to the ability of an engineering system to perform its intended function consistently and without failure over a specified period of time. It is a measure of the system's ability to operate without experiencing a breakdown or malfunction. Failure, on the other hand, refers to theRead more

    Reliability refers to the ability of an engineering system to perform its intended function consistently and without failure over a specified period of time. It is a measure of the system’s ability to operate without experiencing a breakdown or malfunction.

    Failure, on the other hand, refers to the inability of an engineering system to perform its intended function. A failure can be caused by a variety of factors, including wear and tear, design flaws, inadequate maintenance, or external factors such as environmental conditions or accidents.

    Overall, reliability is a measure of the system’s ability to operate without experiencing a failure, while failure refers to the inability of the system to perform its intended function due to various factors.

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  5. Asked: December 19, 2022In:

    distinguish between primary fundamental and auxiliary fundamentals units (july 2019)

    Best Answer
    Jemshah Enlightened

    Primary fundamental units are the basic units of measurement that are used in the International System of Units (SI). These units are used to define the base quantities of length, mass, time, temperature, electric current, and luminous intensity. The primary fundamental units are: Length: The meterRead more

    Primary fundamental units are the basic units of measurement that are used in the International System of Units (SI). These units are used to define the base quantities of length, mass, time, temperature, electric current, and luminous intensity. The primary fundamental units are:

    1. Length: The meter (m) is the unit of length in the SI system.
    2. Mass: The kilogram (kg) is the unit of mass in the SI system.
    3. Time: The second (s) is the unit of time in the SI system.
    4. Temperature: The kelvin (K) is the unit of temperature in the SI system.
    5. Electric current: The ampere (A) is the unit of electric current in the SI system.
    6. Luminous intensity: The candela (cd) is the unit of luminous intensity in the SI system.

    Auxiliary fundamental units are derived units that are used to express quantities that cannot be expressed using the primary fundamental units alone. These units are derived by combining the primary fundamental units in various ways, and include units such as the pascal (pressure), the joule (energy), and the watt (power).

    Overall, primary fundamental units are the basic units of measurement used in the SI system, while auxiliary fundamental units are derived units that are used to express quantities that cannot be expressed using the primary fundamental units alone.

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  6. Asked: December 19, 2022In:

    precautions to be observe when using analogue multi range multi-meters (july 2019 no. 1a)

    Jemshah Enlightened

    Analogue multi-range multi-meters are electrical testing instruments that are used to measure various electrical quantities, such as voltage, current, and resistance. There are several precautions that should be observed when using analogue multi-range multi-meters to ensure safety and accurate readRead more

    Analogue multi-range multi-meters are electrical testing instruments that are used to measure various electrical quantities, such as voltage, current, and resistance. There are several precautions that should be observed when using analogue multi-range multi-meters to ensure safety and accurate readings:

    1. Wear protective gear: Always wear protective gear, such as gloves and safety glasses, when using an analogue multi-range multi-meter to protect against electrical shocks and other hazards.
    2. Use the correct range: Make sure to select the correct range for the measurement you are taking. Using the wrong range can result in inaccurate readings or damage to the meter.
    3. Check the battery: Ensure that the battery in the multi-meter is fresh and fully charged to ensure accurate readings.
    4. Disconnect power: When testing electrical circuits, make sure to disconnect the power before taking any measurements to avoid electrical shocks or damage to the meter.
    5. Follow proper grounding procedures: Proper grounding is essential for ensuring accurate and safe measurements. Follow the manufacturer’s instructions for proper grounding procedures when using the multi-meter.
    6. Handle the leads carefully: Be careful when handling the leads of the multi-meter to avoid damaging them or causing short circuits.
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  7. Asked: December 18, 2022In:

    causes of open circuit fault in carbon composition

    Best Answer
    Jemshah Enlightened

    Physical damage: The resistor may have been damaged physically, such as by being dropped or subjected to high temperatures, which can cause the carbon composition material to break or crack, resulting in an open circuit. Age-related wear and tear: Carbon composition resistors can degrade over time dRead more

    1. Physical damage: The resistor may have been damaged physically, such as by being dropped or subjected to high temperatures, which can cause the carbon composition material to break or crack, resulting in an open circuit.
    2. Age-related wear and tear: Carbon composition resistors can degrade over time due to the effects of heat, humidity, and other environmental factors, which can cause the carbon composition material to break down and result in an open circuit.
    3. Soldering defects: If the resistor is not properly soldered to the circuit board, it may have an open circuit due to a poor connection.
    4. Manufacturing defects: There may be a defect in the manufacturing process that caused the resistor to have an open circuit. This could be due to a variety of factors, such as improper mixing or curing of the carbon composition material.
    5. Electrolytic corrosion: In certain conditions, such as in high humidity environments, the carbon composition material may be susceptible to electrolytic corrosion, which can cause an open circuit.
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  8. Asked: December 18, 2022In:

    procedure of assessing the reliability of an equipment

    Best Answer
    Jemshah Enlightened

    There are various methods and approaches that can be used to assess the reliability of equipment. Here is a general outline of a procedure for assessing the reliability of an equipment: Define the system: Clearly define the boundaries and scope of the equipment being evaluated, including the componeRead more

    There are various methods and approaches that can be used to assess the reliability of equipment. Here is a general outline of a procedure for assessing the reliability of an equipment:

    1. Define the system: Clearly define the boundaries and scope of the equipment being evaluated, including the components and sub-systems that are included.
    2. Identify the failure modes: Identify the ways in which the equipment can fail to perform its intended function, including both functional and physical failures.
    3. Determine the failure rate: Estimate the frequency of each failure mode using data from similar equipment or from testing and analysis.
    4. Estimate the repair rate: Estimate the frequency of repairs needed for each failure mode based on historical data or expert judgement.
    5. Calculate the reliability: Use the failure and repair rates to calculate the reliability of the equipment using appropriate mathematical models or software tools.
    6. Analyze the results: Review the results of the reliability assessment to identify areas where the equipment may be at risk of failure or where improvements could be made to increase reliability.
    7. Implement improvements: Based on the results of the analysis, implement changes or improvements to the equipment or its maintenance practices to increase its reliability.
    8. Monitor and review: Regularly monitor the equipment to track its performance and identify any new failure modes or trends that may affect reliability. Review and update the reliability assessment periodically to reflect any changes to the equipment or its operating conditions.
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  9. Asked: December 18, 2022In:

    define reliability with respect to engineering systems

    Best Answer
    Jemshah Enlightened

    reliability refers to the ability of a system, component, or process to perform its intended function under specified conditions for a certain period of time. It is a measure of the probability that the system will perform its required function without failure for a specified time under specified opRead more

    reliability refers to the ability of a system, component, or process to perform its intended function under specified conditions for a certain period of time. It is a measure of the probability that the system will perform its required function without failure for a specified time under specified operating conditions.

    Reliability is an important consideration in the design and evaluation of engineering systems, as it affects the performance, safety, and cost of the system. Engineers use various methods to analyze and improve the reliability of a system, including statistical analysis, reliability testing, and failure mode and effects analysis (FMEA).

    There are several factors that can affect the reliability of an engineering system, including the quality of the materials and components used, the design and manufacturing processes, the operating conditions, and the maintenance and repair practices. Ensuring reliability is an ongoing process that requires careful planning and attention to detail throughout the life cycle of a system.

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  10. Asked: December 18, 2022In:

    derive the dimensional equation of work done in MLT system of units

    Best Answer
    Jemshah Enlightened

    In the MLT system of units (which stands for mass, length, and time), the dimensional equation for work done can be derived as follows: Work done is defined as the force applied to an object multiplied by the distance over which the force is applied. The dimensional equation for force is [F] = MLT^-Read more

    In the MLT system of units (which stands for mass, length, and time), the dimensional equation for work done can be derived as follows:

    Work done is defined as the force applied to an object multiplied by the distance over which the force is applied. The dimensional equation for force is [F] = MLT^-2, and the dimensional equation for distance is [d] = L. Therefore, the dimensional equation for work done is:

    [W] = [F] * [d] = (MLT^-2) * L = ML^2T^-2

    This means that work is expressed in units of mass times length squared per time squared in the MLT system. For example, in the International System of Units (SI), the unit of work is the joule (J), which is defined as the work done when a force of one newton (N) is applied to an object over a distance of one meter (m). In the MLT system, the unit of work would be something like kilograms times meters squared per seconds squared (kg*m^2/s^2).

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  11. Asked: December 18, 2022In:

    describe the following standards with respect with respect to measurements: i. secondary ii. working

    Jemshah Enlightened

     

     

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