Online Test For Second Semester Electrician Students(Module 1 Cell And Batteries)

A photo voltaic cell is a device that converts sunlight into electrical energy. It does this through the photovoltaic effect, where photons from sunlight excite electrons in the cell's semiconductor material, creating a flow of electricity. This process allows the photo voltaic cell to generate electrical power from sunlight, making it an efficient and renewable energy source.

Boost charging is the method of charging a battery for a short duration at a higher rate. This is done to quickly replenish the battery's charge and bring it to a suitable level for normal use. Boost charging is commonly used when a battery needs to be charged quickly, such as in emergency situations or when there is limited time available for charging. This method helps to provide a rapid charge to the battery, allowing it to be used again in a shorter amount of time.

Passing an electric current through liquids can cause a chemical effect. This is because the movement of electrons can break down molecules and create new chemical compounds. This process is known as electrolysis and is commonly used in various applications such as electroplating, water splitting, and electrolytic cells.

The formula for Faraday's first law of electrolysis is M = zit, where M represents the mass of the substance deposited or liberated at the electrode, z is the electrochemical equivalent, i is the current, and t is the time. This formula shows the relationship between the amount of substance deposited or liberated during electrolysis and the current and time.

Buckling is the correct answer because it refers to the defect of bending in plates in secondary cells. Buckling occurs when the plates in a battery become deformed or distorted, typically due to excessive pressure or stress. This can lead to reduced battery performance and potential damage to the battery. Therefore, buckling is the appropriate term to describe the bending of plates in secondary cells.

The correct answer is "faradays laws of electrolysis." Faraday's laws of electrolysis describe the relationship between the amount of substance produced or consumed during an electrolytic reaction and the quantity of electricity passed through the electrolyte. This law explains the process of electrolysis, where an electric current is used to drive a non-spontaneous chemical reaction. Lenz's law, Joule's law, and Faraday's laws of electromagnetic induction are unrelated to the functioning of secondary cells.

The capacity of batteries is specified in ampere hour, which is a unit of electrical charge. It represents the amount of electrical charge that a battery can deliver over a certain period of time. This unit is commonly used to measure the capacity of batteries because it takes into account both the current (amperes) and the duration (hours) for which the battery can provide a steady flow of current. Therefore, ampere hour is the most appropriate unit to specify the capacity of batteries.

The hydrometer is used during the charging of a battery to determine the specific gravity of the electrolyte. The specific gravity of the electrolyte is a measure of its density and can indicate the state of charge of the battery. As the battery charges, the specific gravity of the electrolyte increases, indicating that the battery is becoming fully charged. By measuring the specific gravity, the user can determine if the battery is properly charging and if it has reached its full capacity. This helps to ensure that the battery is functioning correctly and can provide accurate information about its charge level.

The unit of electric charge is coulomb. The coulomb is a fundamental unit of charge in the International System of Units (SI). It represents the amount of electric charge transported by a constant current of one ampere in one second. The coulomb is commonly used to measure the quantity of charge in electrical systems and is essential in understanding the behavior of electric currents and electromagnetic interactions.

Mercury cells are commonly used in digital watches due to their high energy density, long shelf life, and stable voltage output. They provide a reliable power source for digital watch movements, ensuring accurate timekeeping. Additionally, mercury cells are small and lightweight, making them suitable for compact electronic devices like watches.

The formula to calculate the mass deposited during electrolysis is M = zit gm. This formula takes into account the charge of the ions (z), the current (i), and the time (t) to determine the amount of mass deposited. The product of z, i, and t gives the total charge passed during electrolysis, which is then multiplied by the molar mass (g/mole) to obtain the mass deposited.

Diluted sulfuric acid is used as an electrolyte in lead-acid batteries. This is because sulfuric acid dissociates into hydrogen ions (H+) and sulfate ions (SO4^2-) in solution, allowing for the flow of electric current. The hydrogen ions participate in the redox reactions that occur during the charging and discharging of the battery, while the sulfate ions help maintain electrical neutrality. Additionally, sulfuric acid is able to provide the necessary acidity for the reactions to occur efficiently.

If one cell is connected with reverse polarity in a parallel combination circuit, it means that the positive terminal of one cell is connected to the negative terminal of the other cell. This creates a short circuit because the current flows in the opposite direction through the cells, causing a high amount of current to flow between them. As a result, the cells will get short-circuited, which can lead to damage or malfunctioning of the circuit.

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The output voltage of a lithium cell is typically around 3.7 volts. However, it is important to note that lithium cells can come in various voltages depending on their specific chemistry and design. Therefore, it is incorrect to state that the output voltage of a lithium cell is 2.5 volts.

Sponge lead is used to make negative plates in a lead-acid battery. The negative plates in a lead-acid battery are made from a porous and spongy form of lead, known as sponge lead. This material allows for a larger surface area and increased contact with the electrolyte, which enhances the battery's performance and efficiency. Sponge lead is chosen for its ability to efficiently store and release electrical energy during the battery's charging and discharging cycles.

Cathodic protection is a technique used to control the corrosion of metal surfaces. It involves making the metal surface the cathode of an electrochemical cell, which results in the reduction of corrosion by supplying electrons to the metal surface. This technique is commonly used in industries such as oil and gas, maritime, and infrastructure to protect metal structures from corrosion caused by environmental factors such as moisture and saltwater.

Ammonium chloride is used as an electrolyte in carbon zinc dry cells. It helps to facilitate the flow of electrons between the zinc anode and the carbon cathode, allowing the cell to generate electrical energy. Ammonium chloride also helps to prevent the build-up of zinc oxide on the anode, which can hinder the cell's performance. Therefore, ammonium chloride is the correct answer for the electrolyte used in carbon zinc dry cells.

During the charging process of a lead-acid battery, a chemical reaction occurs at the positive plate. This reaction involves the conversion of lead dioxide (PbO2) into lead peroxide (PbO4), which is the correct answer. Lead peroxide is formed as a result of the charging process and is essential for the battery's functionality. It helps in the conversion of electrical energy into chemical energy, allowing the battery to store and release electricity efficiently.

The output power of solar cells decreases with a decrease in temperature. This is because as the temperature decreases, the efficiency of the solar cells decreases, resulting in a lower output power.

The function of the fine selector switch in a battery charger is to select the desired current rating for charging the battery. This switch allows the user to choose the appropriate current level based on the battery's specifications and charging requirements. By selecting the correct current rating, the charger can provide the optimal charging current to ensure efficient and safe charging of the battery.