Battery Maintenance MCQ Quiz Questions With Answers

A hydrometer is used to measure the specific gravity of a lead acid battery cell. Specific gravity is a measure of the density of a substance compared to the density of water. In the case of a lead acid battery, the specific gravity of the electrolyte solution indicates the state of charge of the battery. By measuring the specific gravity with a hydrometer, one can determine if the battery is fully charged, partially charged, or discharged. This information is important for maintaining the battery's performance and lifespan.

NiCad batteries maintain an almost constant voltage throughout discharge. This means that as the battery is being used and its charge is being depleted, the voltage output remains relatively stable. This is beneficial because it allows for a more consistent and reliable power supply. In contrast, other types of batteries, such as Lead Acid batteries, may experience a significant drop in voltage as they discharge, leading to a less stable power output.

When servicing lead acid batteries, it is important to take certain precautions. Wearing personal protective equipment (PPE) is crucial to protect oneself from potential hazards such as acid spills or fumes. Removing metal jewelry is necessary to prevent any contact with the battery terminals, which could cause short circuits or electrical shocks. Additionally, having a neutralizing agent available is important in case of acid spills or leaks, as it can help to neutralize the acid and minimize damage. Therefore, all of the mentioned precautions must be taken when servicing lead acid batteries.

Distilled water should be added to the lead acid battery to top up the electrolyte level. This is because distilled water is free from impurities and minerals that may be present in tap water, which can affect the performance and lifespan of the battery. Adding sulphuric acid or boric acid can be harmful and may cause damage to the battery.

A sea level boosted engine is designed to maintain the performance of an aircraft at sea level conditions up to a certain altitude known as the critical altitude. This means that the engine is able to provide the same level of power and efficiency as it would at sea level, even as the aircraft climbs to higher altitudes where the air density decreases. This is important because as the altitude increases, the air becomes thinner and the engine's performance naturally decreases. By using a sea level boosted engine, the aircraft can maintain optimal performance and efficiency even at higher altitudes.

When the weight and balance records have been lost, a small aircraft needs to be reweighed after initial certification. This is because the weight and balance records are crucial for ensuring the aircraft's safety and performance. Without these records, it becomes impossible to accurately calculate the aircraft's weight and balance, which can have serious consequences during flight. Therefore, reweighing the aircraft is necessary to establish new weight and balance measurements and ensure the aircraft remains within safe operating limits.

If a NiCad battery fails its capacity check, the required next step would be to deep cycle the battery. Deep cycling refers to fully discharging and then recharging the battery to help restore its capacity. This process can help remove any memory effect that may have developed in the battery and improve its overall performance.

Once a sea level boosted engine is above its critical altitude, the performance (horsepower) will drop. This is because the engine relies on the denser air at lower altitudes to generate more power. As the altitude increases, the air becomes thinner, resulting in a decrease in engine performance.

When an aircraft operates with a center of gravity that is too far forward, it causes an imbalance in the distribution of weight. This can lead to longer takeoff distances because the aircraft may struggle to lift off the ground efficiently. The forward center of gravity can result in reduced lift on the wings, making it harder for the aircraft to generate enough lift to become airborne. As a result, the aircraft requires a longer distance to gain enough speed and lift to take off.

Sulfuric acid is used as the electrolyte in lead acid batteries. It plays a crucial role in the battery's functioning by facilitating the flow of electric current between the battery's electrodes. Sulfuric acid acts as a conductor, allowing the movement of ions between the lead plates, which generates the electrical energy. It also helps in maintaining the battery's charge and preventing the build-up of lead sulfate on the plates, which can reduce the battery's efficiency. Therefore, sulfuric acid is the correct electrolyte for lead acid batteries.

A turbocharger on an aircraft piston engine is not used to create a pressure source to drive instruments and the de-ice. Turbochargers are primarily used to increase sea level horsepower, maintain sea level horse to a critical altitude, and provide air for cabin pressurization. The purpose of driving instruments and de-ice systems is usually achieved through other means, such as engine bleed air or dedicated pumps.

If an aircraft's center of gravity is not within its allowable range, ballast can be added to shift it back into its desired range. Ballast refers to any material that is added to the aircraft to adjust its weight distribution. By adding ballast, the center of gravity can be moved to the appropriate position, ensuring the aircraft's stability and performance. This procedure is commonly used to maintain the aircraft's balance and prevent any potential safety issues that may arise from an out-of-range center of gravity.

The flight crew is included as part of the aircraft payload because they are essential personnel who are responsible for operating the aircraft during a flight. They contribute to the overall weight of the aircraft and their presence is necessary for the safe and successful completion of the flight.

The term used to describe the product of a weight multiplied by its arm when applied to a lever is called "moment". In physics and engineering, moment refers to the turning effect produced by a force acting at a distance from a pivot point. It is calculated by multiplying the magnitude of the force by the perpendicular distance from the pivot. The moment is used to determine the balance and stability of a lever system.

The exhaust gases will enter a turbocharger through the circular plenum around the outside of the turbine. The turbine is a component of the turbocharger that is driven by the exhaust gases. The circular plenum is the pathway through which the exhaust gases flow into the turbine. This arrangement allows the turbine to harness the energy from the exhaust gases and use it to drive the compressor, which in turn increases the intake air pressure and improves the engine's performance.

The source of "muscle" pressure that drives the waste gate actuator towards the closed position is oil pressure from the EDP.

The compressor discharge pressure of a turbocharger is also called the upper deck pressure.

During discharge, the specific gravity of a NiCad cell remains constant. Specific gravity is a measure of the density of a substance compared to the density of water. In a NiCad cell, the specific gravity is determined by the concentration of the electrolyte solution. During discharge, the concentration of the electrolyte remains relatively constant, resulting in no significant change in the specific gravity.

In a turbocharger system, the speed of the compressor is controlled by regulating the flow of air into the turbine. By controlling the amount of air entering the turbine, the speed of the turbine and subsequently the compressor can be adjusted. This allows for better control of the boost pressure and overall performance of the turbocharger system.

The correct answer is that the aircraft centre of gravity will always be between the forward at C of G range limits for all legal loading conditions. This means that as long as the aircraft is loaded within its legal limits, the centre of gravity will always fall within the specified range of FS 47 and FS 53. Therefore, there is no need to reweight the aircraft at every annual inspection or add ballast to either the nose or tail.

The primary advantage of using electronic load cells over mechanical platform scales is that tare weight is not required for the weighing procedure. Unlike mechanical platform scales, electronic load cells can measure the weight of an object without needing to subtract the weight of the container or platform it is placed on. This saves time and effort as there is no need to calculate or subtract the tare weight from the total weight measurement.

Potassium hydroxide is used as the electrolyte in NiCad batteries. An electrolyte is a substance that conducts electricity when dissolved in water or melted. In NiCad batteries, the electrolyte facilitates the flow of electrons between the cathode and anode, allowing the battery to generate electrical energy. Potassium hydroxide is commonly used as the electrolyte in NiCad batteries because it is a strong base that can dissociate into potassium ions and hydroxide ions, enabling the movement of charge within the battery.

The answer is 3 because it is the only equation that is applicable to weight and balance calculations for aircraft. The other equations (1, 2, and 4) may be relevant for other calculations or scenarios, but they do not specifically pertain to weight and balance calculations.

Weight and balance reports are important documents that ensure the aircraft is properly balanced and within weight limits. These reports need to be certified to confirm their accuracy. Signing a maintenance release is the appropriate action to certify the weight and balance report. This is because the maintenance release signifies that the necessary maintenance and inspections have been completed and the aircraft is in an airworthy condition. By signing the maintenance release, the person takes responsibility for the accuracy of the weight and balance report, ensuring the safety of the aircraft and its occupants.

When an aircraft undergoes a modification that results in a permanent change to its basic empty weight and empty weight center of gravity (C of G), the insurance policy for the aircraft would need to be amended. This is because the modification alters the fundamental characteristics of the aircraft, which would impact its insurability. An amendment to the insurance policy would ensure that the coverage accurately reflects the modified aircraft's new specifications and potential risks.

Baking soda is used to neutralize a spilled electrolyte from a lead acid battery. Baking soda, also known as sodium bicarbonate, is a mild alkaline substance that can effectively neutralize the acidic properties of the spilled electrolyte. It helps to prevent further damage or corrosion caused by the acidic electrolyte and promotes a safer and cleaner environment.

The density controller controls the turbocharger at full throttle. This means that the density controller is responsible for regulating the airflow and boost pressure of the turbocharger when the engine is operating at maximum power. At full throttle, the density controller adjusts the turbocharger's performance to ensure optimal air-fuel mixture and engine performance.

To move the center of gravity (C of G) aft from FS 37.5 to FS 42.5, additional weight needs to be added at the back of the aircraft. The correct answer is 58.43 lbs. This means that 58.43 lbs of ballast is required to shift the C of G to the desired position.

The centre of gravity location for larger aircraft with swept back tapered wings is commonly expressed as a percentage of the MAC (mean aerodynamic chord). The MAC is a reference line that represents the average chord length of the wing, and expressing the centre of gravity location as a percentage of the MAC allows for easy comparison and adjustment of the aircraft's balance. By using this measurement, pilots and engineers can ensure that the aircraft is properly balanced and stable during flight.

Boric acid is used to neutralize a spilled electrolyte from a Nicad battery because it acts as a weak acid and can react with the strong base present in the electrolyte. This reaction helps to neutralize the electrolyte and prevent any further damage or chemical reactions. Water, baking soda, and sulfuric acid are not suitable for neutralizing the spilled electrolyte from a Nicad battery.

The center of gravity location, referenced to the datum for the illustrated lever, is 84 inches away. This means that the point where the weight of the lever is evenly distributed is located 84 inches from the reference point or datum.

The correct answer is BL minus 2. The question is asking for the port side (left side) lateral center of gravity (C of G) range limit for a longitudinal C of G at FS 248. The term "BL" refers to the basic lateral arm, which is a measurement used to determine the lateral position of the C of G. The answer BL minus 2 indicates that the port side lateral C of G range limit is 2 units to the left of the basic lateral arm.

A pressure relief valve is often used to protect the engine from excessive turbocharger "boost". This valve is set at a specific pressure level, typically 1.5 - 2" of Hg above the maximum specified boost level. When the boost pressure exceeds this level, the valve opens and releases the excess pressure, preventing any damage to the engine. This ensures that the engine operates within safe limits and avoids any potential issues caused by excessive turbocharger boost.

In a turbocharger, the compressor is driven by a turbine. The turbine is powered by the flow of exhaust gases from the engine. As the exhaust gases pass through the turbine, they cause it to spin, which in turn spins the compressor. The compressor then compresses the incoming air, increasing its density and allowing for more efficient combustion in the engine. Therefore, the correct answer is that exhaust gases passing through a turbine will turn the compressor.

To correct for a nose-high condition during aircraft leveling, air needs to be released from the nose wheel tire. This will lower the nose of the aircraft and bring it to a level position.

When weighing the aircraft, the mechanic would need to mathematically remove the weight of the engine oil from the total weight in order to obtain the licensed empty weight. This is because the aircraft type certificate data sheet provides the weight of the aircraft without any operating fluids, including engine oil.

The basic empty weight refers to the weight of an aircraft without any optional equipment, hydraulic fluid, or paint. It includes only full engine oil, not full lavatory fluid, potable water, or usable fuel. The engine oil is considered a necessary component of the aircraft's weight calculation.

The given answer states that the aircraft component is located 112 inches aft of the datum, which means it is positioned towards the rear of the aircraft. Additionally, it is located 24 inches above the fuselage center line, indicating that it is positioned higher than the center line of the fuselage.

The correct answer describes the datum as an imaginary reference line used to identify wing stations.

Rotary wing aircraft, such as helicopters, have a different weight and balance procedure compared to fixed wing aircraft. One additional procedure required for rotary wing aircraft is a lateral C of G check. This check is necessary to ensure that the center of gravity of the aircraft is within acceptable limits from side to side. This is important for maintaining stability and control during flight. Fixed wing aircraft do not require this specific check as their weight and balance considerations are primarily focused on the longitudinal axis.

The correct answer is 2,538 lbs. This means that the basic empty weight of the aircraft, without any fuel, is 2,538 pounds.

Useful load refers to the maximum weight of passengers, cargo, and fuel that an aircraft can carry. It is calculated by subtracting the basic empty weight of the aircraft, which includes the weight of the structure, systems, and fixed equipment, from the maximum takeoff weight. This means that the correct answer is "Maximum takeoff weight minus basic empty weight."

To remedy the condition of having the center of gravity aft of the operating range after loading, the flight crew would install permanent ballast in the nose section of the aircraft. This would help to shift the center of gravity forward and bring it within the acceptable range.

Based on the given chart, the approximate minimum gross weight of the aircraft is 6,725 lbs.

The correct answer is 50.6 inches. This means that the empty weight center of gravity of the aircraft is located at a distance of 50.6 inches from the reference point. This measurement is important for determining the balance and stability of the aircraft during flight.

Based on the information provided in the chart, the aft C of G range limit for a helicopter weight of 6,250 pounds is FS 255.1.

The net weight of an aircraft is calculated by adding the scale weight and the tare weight. The scale weight is the weight of the aircraft as measured on a scale, while the tare weight is the weight of any additional equipment or items that are not part of the aircraft's basic empty weight. By adding these two weights together, the net weight of the aircraft can be determined.

The aircraft empty weight is determined by calculating the net weight of the aircraft, which includes all the necessary equipment and systems, along with the weight of the unusable fuel. This weight does not include any passengers, cargo, or usable fuel. The net weight plus unusable fuel gives an accurate measurement of the aircraft's empty weight.

When preparing to weigh an aircraft, it is necessary to release air from the nose wheel tire. This is done to ensure that the weight of the aircraft is evenly distributed and accurately measured. By releasing air from the nose wheel tire, the weight of the aircraft is transferred to the scales, allowing for an accurate measurement. This step is important in order to obtain precise weight and balance information for the aircraft.

The forward C of G range limit for an aircraft weighing 6,400 pounds is 133 inches. This information can be determined by referencing the chart provided.