When servicing lead acid batteries, what precautions must be taken?

Ensure neutralizing agent is available

What is a benefit of NiCad batteries compared to Lead Acid Batteries?

NiCad batteries maintain an almost constant voltage throughout discharge

NiCad batteries are not susceptible to thermal runaway

NiCad batteries maintain an almost constant voltage throughout discharge

NiCad batteries require fewer cells for the same voltage

NiCad electrolyte is less corrosive & dangerous than Lead Acid electrolyte

What is the required next step if a NiCad battery fails its capacity check?

Tag serviceable & place on shelf

What will happen to the performance of a sea level boosted engine once it is above its critical altitude?

Performance (horsepower) will drop

The engine will overspeed and overheat

Performance (horsepower) will drop

Performance (horsepower) will rise

Where will the exhaust gasses enter a turbocharger?

Through the circular plenum around the outside of the turbine

Through the center of the turbine

Through the circular plenum around the outside of the compressor

Through the center of the compressor

What is often used to protect the engine from excessive turbocharger “boost”?

A pressure relief valve, set 1.5 - 2” of Hg above max specified boot

A bypass valve which will redirect some of the turbocharger exhaust into the inlet

A bypass valve valve which will redirect some of the turbochargers to the inlet

A back-pressure sensing thermal compensating

A pressure relief valve, set 1.5 - 2” of Hg above max specified boot

Which of the following is not a use for a turbocharger on an aircraft piston engine?

To create a pressure source to drive instruments and the de-ice

To increase sea level horsepower

To provide air for cabin pressurization

To create a pressure source to drive instruments and the de-ice

To maintain sea level horse to a critical altitude

What is the purpose of a sea level boosted engine?

To maintain sea level performance up to the critical altitude

To maintain sea level performance above the critical altitude

To maintain sea level performance up to the critical altitude

To maintain sea level performance below sea level

To maintain sea level performance up to the aircraft’s service

What is the source of “muscle” pressure that drives the waste gate actuator towards the closed position?

Turbocharger compressor discharge pressure

When does the density controller control the turbocharger?

It does not, that is the job of the differential pressure

How is the speed of the compressor controlled in a turbocharger system?

By controlling the flow of air into the turbine

By controlling the flow of air into the compressor

By controlling the flow of air our of the turbine

By controlling the flow of air out of the compressor

By controlling the flow of air into the turbine

What is used to turn the compressor of a turbocharger?

Exhaust gasses passing through a turbine will turn the compressor

The compressor will be turned by the crankshaft

Intake gasses passing through a turbine will turn the compressor

The compressor will be turned by the propeller gearbox

Exhaust gasses passing through a turbine will turn the compressor

An aircraft type certificate data sheet identifies that the empty weight centre of gravity (EWCG) range is between FS 47 and FS 53. A mechanic establishes that the actual EWCG is located at FS 47.2. Which of the following statements is correct?

The aircraft centre of gravity will always be between the forward at C of G range limits for all legal loading conditions

The aircraft must be reweighted at every annual inspection to ensure that the EWCG is still within range.

The aircraft centre of gravity will always be between the forward at C of G range limits for all legal loading conditions

Ballast is required at the nose of the aircraft

Ballast is required in the tail of the aircraft

Which of the following describes useful load?

Maximum takeoff weight minus basic empty weight

Maximum takeoff weight minus fuel used during flight

Maximum takeoff weight minus basic empty weight

Basic empty weight plus usable fuel

Choose the statement that describes the datum from the following

An imaginary line down the centre-line of the aircraft, established by the manufacturer, used exclusively for weight and balance computations

An imaginary reference line used to identify wing stations

How is aircraft empty weight determined?

Maximum takeoff weight minus fuel used during the flight

Battery Maintenance MCQ Quiz Questions With Answers

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Questions: 50 | Attempts: 361 | Updated: May 12, 2023

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Battery Maintenance MCQ Quiz Questions With Answers - Quiz

In this quiz, you'll be able to learn about various important battery maintenance MCQ questions with answers. So, if you're looking for a practice set of questions on cells, lead-acid batteries, and turbochargers, you should definitely play this quiz. Do you know batteries should be kept clean and corrosion-free at all times to work efficiently? Many other things should be done to maintain the lifetime of a battery. Do you know what those are? Take this quiz and get to know about them.

Questions and Answers

1.

When servicing lead acid batteries, what precautions must be taken?
- A.
  
  Wear PPE
- B.
  
  Remove metal jewelry
- C.
  
  Ensure neutralizing agent is available
- D.
  
  All of the above
Correct Answer
D. All of the above

Explanation
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.

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2.

What is used to measure the specific gravity of a lead acid battery cell?
- A.
  
  Thermometer
- B.
  
  Anemometer
- C.
  
  Barometer
- D.
  
  Hydrometer
Correct Answer
D. Hydrometer

Explanation
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.

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3.

During servicing of a lead acid battery you notice that it has a low electrolyte level. What should you add to the battery to top up the electrolyte level?
- A.
  
  Distilled water
- B.
  
  Sulphuric acid
- C.
  
  Tap water
- D.
  
  Boric acid
Correct Answer
A. Distilled water

Explanation
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.

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4.

What is used to neutralize a spilled electrolyte from a lead acid battery?
- A.
  
  Boric acid
- B.
  
  Water
- C.
  
  Baking soda
- D.
  
  Sulfuric acid
Correct Answer
C. Baking soda

Explanation
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.

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5.

What electrolyte is used in lead acid batteries?
- A.
  
  Boric acid
- B.
  
  Potassium hydroxide
- C.
  
  Sulfuric acid
- D.
  
  Distilled water
Correct Answer
C. Sulfuric acid

Explanation
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.

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6.

What is a benefit of NiCad batteries compared to Lead Acid Batteries?
- A.
  
  NiCad batteries are not susceptible to thermal runaway
- B.
  
  NiCad batteries maintain an almost constant voltage throughout discharge
- C.
  
  NiCad batteries require fewer cells for the same voltage
- D.
  
  NiCad electrolyte is less corrosive & dangerous than Lead Acid electrolyte
Correct Answer
B. NiCad batteries maintain an almost constant voltage throughout discharge

Explanation
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.

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7.

What is the required next step if a NiCad battery fails its capacity check?
- A.
  
  Deep cycle
- B.
  
  Tag serviceable & place on shelf
- C.
  
  Recharge
- D.
  
  Tag unserviceable & scrap
Correct Answer
A. Deep cycle

Explanation
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.

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8.

What is used to neutralize a spilled electrolyte from a Nicad battery?
- A.
  
  Boric acid
- B.
  
  Water
- C.
  
  Baking soda
- D.
  
  Sulfuric acid
Correct Answer
A. Boric acid

Explanation
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.

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9.

What electrolyte is used in NiCad batteries?
- A.
  
  Boric acid
- B.
  
  Potassium hydroxide
- C.
  
  Sulfuric acid
- D.
  
  Sodium bicarbonate
Correct Answer
B. Potassium hydroxide

Explanation
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.

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10.

What happens to the specific gravity of a NiCad cell during discharge?
- A.
  
  Decreases
- B.
  
  Increases
- C.
  
  Remains constant
- D.
  
  Drops to zero
Correct Answer
C. Remains constant

Explanation
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.

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11.

What will happen to the performance of a sea level boosted engine once it is above its critical altitude?
- A.
  
  Nothing
- B.
  
  The engine will overspeed and overheat
- C.
  
  Performance (horsepower) will drop
- D.
  
  Performance (horsepower) will rise
Correct Answer
C. Performance (horsepower) will drop

Explanation
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.

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12.

Where will the exhaust gasses enter a turbocharger?
- A.
  
  Through the circular plenum around the outside of the turbine
- B.
  
  Through the center of the turbine
- C.
  
  Through the circular plenum around the outside of the compressor
- D.
  
  Through the center of the compressor
Correct Answer
A. Through the circular plenum around the outside of the turbine

Explanation
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.

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13.

What is often used to protect the engine from excessive turbocharger “boost”?
- A.
  
  A bypass valve which will redirect some of the turbocharger exhaust into the inlet
- B.
  
  A bypass valve valve which will redirect some of the turbochargers to the inlet
- C.
  
  A back-pressure sensing thermal compensating
- D.
  
  A pressure relief valve, set 1.5 - 2” of Hg above max specified boot
Correct Answer
D. A pressure relief valve, set 1.5 - 2” of Hg above max specified boot

Explanation
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.

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14.

Which of the following is not a use for a turbocharger on an aircraft piston engine?
- A.
  
  To increase sea level horsepower
- B.
  
  To provide air for cabin pressurization
- C.
  
  To create a pressure source to drive instruments and the de-ice
- D.
  
  To maintain sea level horse to a critical altitude
Correct Answer
C. To create a pressure source to drive instruments and the de-ice

Explanation
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.

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15.

What is the purpose of a sea level boosted engine?
- A.
  
  To maintain sea level performance above the critical altitude
- B.
  
  To maintain sea level performance up to the critical altitude
- C.
  
  To maintain sea level performance below sea level
- D.
  
  To maintain sea level performance up to the aircraft’s service
Correct Answer
B. To maintain sea level performance up to the critical altitude

Explanation
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.

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16.

What is the source of “muscle” pressure that drives the waste gate actuator towards the closed position?
- A.
  
  Hydraulic pressure
- B.
  
  Oil pressure from the EDP
- C.
  
  Fuel pressure from the EDP
- D.
  
  Turbocharger compressor discharge pressure
Correct Answer
B. Oil pressure from the EDP

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

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17.

When does the density controller control the turbocharger?
- A.
  
  At full throttle
- B.
  
  At idle
- C.
  
  It does not, that is the job of the differential pressure
- D.
  
  At all throttle settings
Correct Answer
A. At full throttle

Explanation
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.

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18.

What is the compressor discharge pressure of a turbocharger also called?
- A.
  
  Upper deck pressure
- B.
  
  Exhaust back pressure
- C.
  
  Exhaust gas pressure
- D.
  
  Manifold pressure
Correct Answer
A. Upper deck pressure

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

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19.

How is the speed of the compressor controlled in a turbocharger system?
- A.
  
  By controlling the flow of air into the compressor
- B.
  
  By controlling the flow of air our of the turbine
- C.
  
  By controlling the flow of air out of the compressor
- D.
  
  By controlling the flow of air into the turbine
Correct Answer
D. By controlling the flow of air into the turbine

Explanation
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.

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20.

What is used to turn the compressor of a turbocharger?
- A.
  
  The compressor will be turned by the crankshaft
- B.
  
  Intake gasses passing through a turbine will turn the compressor
- C.
  
  The compressor will be turned by the propeller gearbox
- D.
  
  Exhaust gasses passing through a turbine will turn the compressor
Correct Answer
D. Exhaust gasses passing through a turbine will turn the compressor

Explanation
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.

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21.

An aircraft type certificate data sheet identifies that the empty weight centre of gravity (EWCG) range is between FS 47 and FS 53. A mechanic establishes that the actual EWCG is located at FS 47.2. Which of the following statements is correct?
- A.
  
  The aircraft must be reweighted at every annual inspection to ensure that the EWCG is still within range.
- B.
  
  The aircraft centre of gravity will always be between the forward at C of G range limits for all legal loading conditions
- C.
  
  Ballast is required at the nose of the aircraft
- D.
  
  Ballast is required in the tail of the aircraft
Correct Answer
B. The aircraft centre of gravity will always be between the forward at C of G range limits for all legal loading conditions

Explanation
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.

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22.

Which of the following describes useful load?
- A.
  
  Maximum takeoff weight minus fuel used during flight
- B.
  
  Another name for payload
- C.
  
  Maximum takeoff weight minus basic empty weight
- D.
  
  Basic empty weight plus usable fuel
Correct Answer
C. Maximum takeoff weight minus basic empty weight

Explanation
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."

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23.

What are the consequences of an aircraft operating with a centre of gravity that is too far forward?
- A.
  
  Lower stall speed
- B.
  
  Better spin characteristics
- C.
  
  Improved pitch stability
- D.
  
  Longer takeoff distance
Correct Answer
D. Longer takeoff distance

Explanation
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.

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24.

Choose the statement that describes the datum from the following
- A.
  
  Butt Line (BL) 0.0
- B.
  
  An imaginary line down the centre-line of the aircraft, established by the manufacturer, used exclusively for weight and balance computations
- C.
  
  Fuselage Station (FS) 0.0
- D.
  
  An imaginary reference line used to identify wing stations
Correct Answer
C. Fuselage Station (FS) 0.0

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

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25.

How is aircraft empty weight determined?
- A.
  
  Maximum takeoff weight minus fuel used during the flight
- B.
  
  Net weight plus unusable fuel
- C.
  
  Scale weight minus tare weight
- D.
  
  Scale weight plus tare weight
Correct Answer
B. Net weight plus unusable fuel

Explanation
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.

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26.

How is net weight calculated for an aircraft?
- A.
  
  Scale weight minus tare weight
- B.
  
  Basic empty weight + payload
- C.
  
  Basic empty weight minus special and optional equipment
- D.
  
  Scale weight plus tare weight
Correct Answer
D. Scale weight plus tare weight

Explanation
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.

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27.

An aircraft type certificate data sheet provides the licensed empty weight of an aircraft, what action would the mechanic take when weighing the aircraft?
- A.
  
  Service all operating fluids (i,e, engine oil, hydraulic fluid, lavatory fluid, potable water, etc.) to ful
- B.
  
  Remove all special and optional equipment
- C.
  
  Drain all operating fluids
- D.
  
  Mathematically remove the engine oil after weighing
Correct Answer
D. Mathematically remove the engine oil after weighing

Explanation
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.

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28.

Which statement is true concerning basic empty weight?
- A.
  
  Does not include optional equipment, hydraulic fluid or paint
- B.
  
  Includes only full lavatory fluid and potable water
- C.
  
  Includes full usable fuel
- D.
  
  Includes full engine oil
Correct Answer
D. Includes full engine oil

Explanation
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.

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29.

An aircraft component is located at FS 112, WL 24, where would this place the component?
- A.
  
  112 inches aft of the datum, 24 inches outboard of the fuselage center line
- B.
  
  112 inches above the datum, 24 inches outboard of the fuselage center line
- C.
  
  112 inches aft of the datum, 24 inches above the fuselage center line
- D.
  
  112 inches forward of the datum, 24 inches below the fuselage center line
Correct Answer
C. 112 inches aft of the datum, 24 inches above the fuselage center line

Explanation
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.

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30.

Which of the following is included as part of the aircraft payload?
- A.
  
  Unusable fue
- B.
  
  Optional equipment
- C.
  
  Flight crew
- D.
  
  Fixed ballast
Correct Answer
C. Flight crew

Explanation
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.

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31.

What is the centre of gravity location, referenced to the datum for the illustrated lever?
- A.
  
  + 84 inches
- B.
  
  - 6 feet
- C.
  
  - 84 inches
- D.
  
  + 7 inches
Correct Answer
A. + 84 inches

Explanation
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.

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32.

Choose the method that would normally be used to correct for a nose-high condition during aircraft leveling
- A.
  
  Release air from the main gear oleo struts.
- B.
  
  Lower the main jacks..
- C.
  
  Raise the nose gear jack
- D.
  
  Release air from the nose wheel tire
Correct Answer
D. Release air from the nose wheel tire

Explanation
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.

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33.

Which statement is true when preparing to weigh an aircraft?
- A.
  
  The aircraft brakes must be applied to prevent side loads on the scales.
- B.
  
  All aircraft fluids must be drained (fuel, engine oil, hydraulics, etc)
- C.
  
  The aircraft must be leveled to simulate normal flight altitude
- D.
  
  Release air from the nose wheel tire.
Correct Answer
D. Release air from the nose wheel tire.

Explanation
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.

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34.

Which equation would you apply to the illustrated aircraft (top of diagram) for weight and balance calculations?
- A.
  
  1
- B.
  
  2
- C.
  
  3
- D.
  
  4
Correct Answer
C. 3

Explanation
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.

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35.

What is the primary advantage of using electronic load cells over mechanical platform scales?
- A.
  
  Tare weight is not required for the weighing procedure
- B.
  
  The aircraft does not have to be placed on jacks, this saving considerable limits
- C.
  
  Unusable fuel calculations are not required.
- D.
  
  Load cells never require calibration.
Correct Answer
A. Tare weight is not required for the weighing procedure

Explanation
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.

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36.

When does a small aircraft need to be reweighed (after initial certification)
- A.
  
  At evert annual or 100 hour inspection
- B.
  
  Every five years
- C.
  
  When the weight and balance records have been lost
- D.
  
  When substantial dirt has accumulated on the aircraft
Correct Answer
C. When the weight and balance records have been lost

Explanation
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.

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37.

What is the basic empty weight of the aircraft illustrated in the figure (aircraft fuel has been drained)? NOTE : Complete this in conjunction with the question asking about the empty weight centre of gravity, as it is the same exercise.
- A.
  
  2,538 lbs.
- B.
  
  2,538 in.lbs.
- C.
  
  2,553 lbs.
- D.
  
  2,554 lbs.
Correct Answer
A. 2,538 lbs.

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

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38.

What is the empty weight centre of gravity of the aircraft shown (aircraft fuel has been drained)? Note: Complete this in conjunction with the question asking about the basic empty weight, as it is the same exercise.
- A.
  
  Minus 50.6 inches
- B.
  
  50.8 inches
- C.
  
  51 inches
- D.
  
  50.6 inches
Correct Answer
D. 50.6 inches

Explanation
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.

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39.

What is the term used to describe the product of a weight x its arm when applied to a lever?
- A.
  
  Net weight
- B.
  
  Tare weight
- C.
  
  Basic empty weight
- D.
  
  Moment
Correct Answer
D. Moment

Explanation
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.

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40.

What procedure is commonly accomplished if an aircraft’s centre of gravity is not within its allowable C of G range?
- A.
  
  Ballast can be added to shift it back into its desired range
- B.
  
  Weight restrictions must be applied
- C.
  
  Special loading charts are required prior to each flight
- D.
  
  Nothing is required, as this a normal flight condition
Correct Answer
A. Ballast can be added to shift it back into its desired range

Explanation
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.

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41.

With reference to the accompanying chart, what is aft C of G range limit for a helicopter weight of 6,250 pounds?
- A.
  
  FS 255.1
- B.
  
  FS 245.9
- C.
  
  FS 245
- D.
  
  FS 256
Correct Answer
A. FS 255.1

Explanation
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.

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42.

What is the port side (left side) lateral C of G range limit for a longitudinal C of G at FS 248?
- A.
  
  BL minus 2
- B.
  
  BL 1.5
- C.
  
  BL 2.4
- D.
  
  BL minus 1
Correct Answer
A. BL minus 2

Explanation
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.

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43.

Complete the following sentence: Weight and balance reports shall be certified be
- A.
  
  Signing a maintenance release
- B.
  
  Signing a weight and balance amendment form
- C.
  
  Completing a weight and balance addendum
- D.
  
  Completing the weight and balance report and equipment list.
Correct Answer
A. Signing a maintenance release

Explanation
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.

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44.

Referencing the chart, what is the forward C of G range limit if the aircraft weighs 6,400 pounds?
- A.
  
  139.2 inches
- B.
  
  134 inches
- C.
  
  132 inches
- D.
  
  133 inches
Correct Answer
D. 133 inches

Explanation
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.

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45.

How much ballast is required at the back of the illustrated aircraft to move the C of G aft from the current location at FS 37.5 to FS 42.5?
- A.
  
  1.32 lbs.
- B.
  
  58.43 lbs
- C.
  
  58.06 lbs
- D.
  
  45.15 lbs
Correct Answer
B. 58.43 lbs

Explanation
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.

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46.

What would need to be insured for an aircraft that has undergone a modification resulting in a permanent change to the basic empty weight and empty weight C of G?
- A.
  
  An airworthiness directive
- B.
  
  An amendment
- C.
  
  A service bulletin
- D.
  
  An addendum
Correct Answer
B. An amendment

Explanation
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.

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47.

How is the centre of gravity location commonly expressed for larger aircraft with swept back tapered wings?
- A.
  
  % of the MAC (mean aerodynamic chord)
- B.
  
  % of the C of L (centre of lift)
- C.
  
  FS (fuselage station) reference to the datum in feet
- D.
  
  FS (fuselage station) reference to the datum in inches
Correct Answer
A. % of the MAC (mean aerodynamic chord)

Explanation
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.

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48.

According to the chart, what is the approximate minimum gross weight of the aircraft?
- A.
  
  6,800 lbs
- B.
  
  6,725 lbs
- C.
  
  6,400 lbs
- D.
  
  6,550 lbs
Correct Answer
B. 6,725 lbs

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

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49.

The flight crew of a large transport category aircraft have found that the centre of gravity is aft of the operating range after loading. What would they do to remedy this condition?
- A.
  
  Trim the ailerons to compensate for this condition.
- B.
  
  Transfer baggage from the aft cargo compartment to the forward compartment
- C.
  
  Install permanent ballast in the nose section of the aircraft
- D.
  
  Shift passengers from the front to the aft section of the aircraft
Correct Answer
C. Install permanent ballast in the nose section of the aircraft

Explanation
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.

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50.

What additional weight and balance procedure is required for rotary wing aircraft that is not a function for fixed wing?
- A.
  
  Static and dynamic main and tail rotor balancing
- B.
  
  An auto-rotation test
- C.
  
  A mandatory test flight after maintenance mods, due to criticalC of G ??? envelopes
- D.
  
  A lateral C of G check
Correct Answer
D. A lateral C of G check

Explanation
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.

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Battery Maintenance MCQ Quiz Questions With Answers

When servicing lead acid batteries, what precautions must be taken?

What is used to measure the specific gravity of a lead acid battery cell?

During servicing of a lead acid battery you notice that it has a low electrolyte level. What should you add to the battery to top up the electrolyte level?

What is used to neutralize a spilled electrolyte from a lead acid battery?

What electrolyte is used in lead acid batteries?

What is a benefit of NiCad batteries compared to Lead Acid Batteries?

What is the required next step if a NiCad battery fails its capacity check?

What is used to neutralize a spilled electrolyte from a Nicad battery?

What electrolyte is used in NiCad batteries?

What happens to the specific gravity of a NiCad cell during discharge?

What will happen to the performance of a sea level boosted engine once it is above its critical altitude?

Where will the exhaust gasses enter a turbocharger?

What is often used to protect the engine from excessive turbocharger “boost”?

Which of the following is not a use for a turbocharger on an aircraft piston engine?

What is the purpose of a sea level boosted engine?

What is the source of “muscle” pressure that drives the waste gate actuator towards the closed position?

When does the density controller control the turbocharger?

What is the compressor discharge pressure of a turbocharger also called?

How is the speed of the compressor controlled in a turbocharger system?

What is used to turn the compressor of a turbocharger?

An aircraft type certificate data sheet identifies that the empty weight centre of gravity (EWCG) range is between FS 47 and FS 53. A mechanic establishes that the actual EWCG is located at FS 47.2. Which of the following statements is correct?

Which of the following describes useful load?

What are the consequences of an aircraft operating with a centre of gravity that is too far forward?

Choose the statement that describes the datum from the following

How is aircraft empty weight determined?

How is net weight calculated for an aircraft?

An aircraft type certificate data sheet provides the licensed empty weight of an aircraft, what action would the mechanic take when weighing the aircraft?

Which statement is true concerning basic empty weight?

An aircraft component is located at FS 112, WL 24, where would this place the component?

Which of the following is included as part of the aircraft payload?

What is the centre of gravity location, referenced to the datum for the illustrated lever?

Choose the method that would normally be used to correct for a nose-high condition during aircraft leveling

Which statement is true when preparing to weigh an aircraft?

Which equation would you apply to the illustrated aircraft (top of diagram) for weight and balance calculations?

What is the primary advantage of using electronic load cells over mechanical platform scales?

When does a small aircraft need to be reweighed (after initial certification)

What is the basic empty weight of the aircraft illustrated in the figure (aircraft fuel has been drained)? NOTE : Complete this in conjunction with the question asking about the empty weight centre of gravity, as it is the same exercise.

What is the empty weight centre of gravity of the aircraft shown (aircraft fuel has been drained)? Note: Complete this in conjunction with the question asking about the basic empty weight, as it is the same exercise.

What is the term used to describe the product of a weight x its arm when applied to a lever?

What procedure is commonly accomplished if an aircraft’s centre of gravity is not within its allowable C of G range?

With reference to the accompanying chart, what is aft C of G range limit for a helicopter weight of 6,250 pounds?

What is the port side (left side) lateral C of G range limit for a longitudinal C of G at FS 248?

Complete the following sentence: Weight and balance reports shall be certified be

Referencing the chart, what is the forward C of G range limit if the aircraft weighs 6,400 pounds?

How much ballast is required at the back of the illustrated aircraft to move the C of G aft from the current location at FS 37.5 to FS 42.5?

What would need to be insured for an aircraft that has undergone a modification resulting in a permanent change to the basic empty weight and empty weight C of G?

How is the centre of gravity location commonly expressed for larger aircraft with swept back tapered wings?

According to the chart, what is the approximate minimum gross weight of the aircraft?

The flight crew of a large transport category aircraft have found that the centre of gravity is aft of the operating range after loading. What would they do to remedy this condition?

What additional weight and balance procedure is required for rotary wing aircraft that is not a function for fixed wing?