To test a coil using an ohmmeter, follow these steps:

1. Set the ohmmeter to the appropriate range: Depending on the resistance of the coil, you may need to set the ohmmeter to a higher or lower range. Consult the manufacturer’s specifications for the expected resistance of the coil, and set the ohmmeter accordingly.
2. Disconnect the coil from the circuit: To avoid damaging the ohmmeter or the coil, it is important to disconnect the coil from any circuit or power source before testing.
3. Test the resistance: Once the ohmmeter is set and the coil is disconnected, touch the probes of the ohmmeter to the terminals of the coil. The ohmmeter should display the resistance of the coil.
4. Compare the results to the manufacturer’s specifications: Consult the manufacturer’s specifications for the expected resistance of the coil, and compare the measured value to the expected value. If the measured value is within the range specified by the manufacturer, the coil is likely to be functioning properly. If the measured value is significantly different from the expected value, the coil may be damaged or malfunctioning.

Overall, testing a coil using an ohmmeter is a simple and effective way to determine whether the coil is functioning properly.

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.

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.

i. Stratification:

Stratification refers to the separation of the different components of the electrolyte solution in a lead acid battery. This can occur when the battery is not used regularly or is not charged and discharged properly. Stratification can cause the battery to lose its ability to hold a charge and may lead to reduced performance and shortened lifespan.

ii. Sulphation:

Sulphation refers to the build-up of lead sulphate crystals on the surface of the lead plates inside a lead acid battery. This can occur when the battery is not charged regularly or is not charged properly, or when it is left in a discharged state for an extended period of time. Sulphation can cause the battery to lose its ability to hold a charge and may lead to reduced performance and shortened lifespan.

A parabolic dish mirror is a type of solar energy collector that uses a parabolic-shaped mirror to focus sunlight onto a receiver at the focus of the parabola. The parabolic shape of the mirror helps to minimize the loss of solar energy during the harvesting process by minimizing the amount of sunlight that is reflected or absorbed by the mirror.

The parabolic shape of the mirror allows it to capture a wide range of sunlight and focus it onto a small area, which increases the intensity of the sunlight and makes it easier to convert into usable forms of energy. In addition, the receiver at the focus of the parabola is typically coated with a highly efficient solar energy conversion material, which helps to further minimize the loss of solar energy during the harvesting process.

Overall, the use of a parabolic dish mirror helps to minimize the loss of solar energy during the harvesting process and increases the efficiency of the system.