2A651 Vol 4 Self Test

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  • 1/60 Questions

    Which part of the barrel assembly provides safe seats for the front and rear cones and also supports the control assembly?

    • Exstension
    • Pitchlock regulator
    • Blade plug
    • Blade shim plate
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Volume Quizzes & Trivia
About This Quiz

The '2a651 Vol 4 Self Test' evaluates knowledge in aircraft maintenance, focusing on components like barrel assemblies, dome assemblies, afterbodies, and pump housings. It assesses understanding of part functions and mechanical relationships crucial for maintaining streamlined aircraft operations.

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  • 2. 

    Which dome assembly part provides a sliding sealing surface between the piston and low-pitch stop?

    • Pitchlock regulator

    • Piston sleeve

    • Flywieghts

    • Speeder spring

    Correct Answer
    A. Piston sleeve
    Explanation
    The piston sleeve is the dome assembly part that provides a sliding sealing surface between the piston and low-pitch stop. It acts as a barrier between the two components, ensuring a tight seal and preventing any leakage or loss of pressure. This helps to maintain the efficiency and functionality of the dome assembly system.

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  • 3. 

    Which dome assembly part prevents the cam bearing rollers from bottoming out in the track slopes?

    • Hub mounting bulkhead

    • Deicer ring holder

    • Stop ring

    • A ring

    Correct Answer
    A. Stop ring
    Explanation
    The stop ring is the dome assembly part that prevents the cam bearing rollers from bottoming out in the track slopes. It acts as a barrier or limit to ensure that the rollers do not reach the bottom of the track slopes, thereby preventing any potential damage or malfunction.

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  • 4. 

    What is the purpose of the afterbodies?

    • To augment basic engine thrust

    • To diffuse compressor air

    • To straighten exhaust flow

    • To streamline the airflow into the engine

    Correct Answer
    A. To streamline the airflow into the engine
    Explanation
    The purpose of the afterbodies is to streamline the airflow into the engine. Afterbodies are designed to reduce drag and turbulence caused by the engine exhaust flow, allowing for a smoother and more efficient flow of air into the engine. By streamlining the airflow, the afterbodies help improve the overall performance and efficiency of the engine.

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  • 5. 

    What drives the main, stanby, and main scavenge pumps?

    • Propeller rotation

    • Turbine rotation

    • Compressor rotation

    • Gearbox rotation

    Correct Answer
    A. Propeller rotation
    Explanation
    The main, standby, and main scavenge pumps are driven by propeller rotation. This means that the pumps are powered by the rotational movement of the propeller. As the propeller rotates, it transfers energy to the pumps, allowing them to function and perform their respective tasks.

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  • 6. 

    Which pump housing part maintains 15-20 psi pressure differential between the atmospheric and pressurized sumps?

    • Pressure relief valve

    • Sump relief valve

    • Auxillary relief valve

    • Compressor relief valve

    Correct Answer
    A. Sump relief valve
    Explanation
    The sump relief valve is the correct answer because it is responsible for maintaining a pressure differential between the atmospheric and pressurized sumps. This valve ensures that the pressure in the sumps remains at a safe and stable level by relieving any excess pressure.

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  • 7. 

    The power transmitted by the brush block assembly is used to supply the propeller with what capability?

    • Propeller anti galling

    • Propeller anti sieze

    • Propeller anti ice

    • Propeller anti governing

    Correct Answer
    A. Propeller anti ice
    Explanation
    The power transmitted by the brush block assembly is used to supply the propeller with the capability of preventing ice formation. This is important because ice buildup on the propeller can disrupt its performance and potentially lead to dangerous situations. By supplying the propeller with anti-ice capability, the brush block assembly helps ensure that the propeller remains ice-free and can operate efficiently.

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  • 8. 

    Which valve limits hydraulic system pressure to 1300 psi above pressurized sump pressure?

    • High pressure relief valve

    • Low pressure relief valve

    • Oil pressure relief valve

    • Compressor relief valve

    Correct Answer
    A. High pressure relief valve
    Explanation
    The high pressure relief valve is responsible for limiting the hydraulic system pressure to 1300 psi above the pressurized sump pressure. This valve is designed to open and release excess pressure when it reaches a certain threshold, preventing damage to the hydraulic system. It ensures that the pressure does not exceed a safe limit, protecting the system from potential failures or leaks.

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  • 9. 

    What preddetermined overspeed setting allows the ratchets to engage?

    • 101.5%

    • 102.5%

    • 103.5%

    • 104.5%

    Correct Answer
    A. 103.5%
    Explanation
    The predetermined overspeed setting that allows the ratchets to engage is 103.5%.

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  • 10. 

    At what two psi is the servo valve unseated, thus allowing the wedge to move?

    • 200-220

    • 220-240

    • 240-280

    • 260-300

    Correct Answer
    A. 240-280
    Explanation
    The correct answer is 240-280. This range of psi is where the servo valve is unseated, meaning that it is opened or released, allowing the wedge to move. Any psi below 240 or above 280 would not cause the servo valve to unseat and the wedge to move.

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  • 11. 

    Controllable pitch can only occur between what degree settings on the coordinator protractor?

    • 0-14

    • 0-24

    • 0-34

    • 0-44

    Correct Answer
    A. 0-34
    Explanation
    Controllable pitch refers to the ability of adjusting the angle of the propeller blades while the engine is running. The coordinator protractor is a device used to measure the angle of the blades. The correct answer suggests that controllable pitch can occur within a range of 0 to 34 degrees on the coordinator protractor. This means that the blades can be adjusted to various angles within this range, allowing for better control and optimization of the propeller's performance.

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  • 12. 

    Constant speed occurs between what degrees on the coordinator protractor?

    • 24-80

    • 34-90

    • 44-100

    • 54-110

    Correct Answer
    A. 34-90
    Explanation
    Constant speed occurs between the degrees 34 and 90 on the coordinator protractor. This means that when an object is moving at a constant speed, its angle on the protractor will remain within this range.

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  • 13. 

    Which cam centers the pilot valve to stop hydrualic action to blade movement?

    • Beta set cam

    • Beta follow up cam

    • Speed set cam

    • Follow up cam

    Correct Answer
    A. Follow up cam
    Explanation
    The follow up cam centers the pilot valve to stop hydraulic action to blade movement.

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  • 14. 

    In the alpha range, the govenor pilot valve is positioned to maintain what rpm?

    • 70%

    • 80%

    • 90%

    • 100%

    Correct Answer
    A. 100%
  • 15. 

    During an underspeed condition, the govenor pilot valve meters fluid to the increase-pitch side of the dome piston; what is a result from this action?

    • Increase in speed

    • Decrease in speed

    • Constant speed

    • Fluctuation in speed

    Correct Answer
    A. Decrease in speed
    Explanation
    When the governor pilot valve meters fluid to the increase-pitch side of the dome piston during an underspeed condition, it causes a decrease in speed. This is because the increase in fluid to the increase-pitch side of the dome piston will result in a decrease in the pitch of the propeller blades. As a result, the propeller will generate less thrust, leading to a decrease in speed.

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  • 16. 

    In what propeller operating range can the low pitch stop limit decreasing blade angle?

    • Flight range

    • Alpha range

    • Beta range

    • Synchrophasing range

    Correct Answer
    A. Flight range
    Explanation
    The correct answer is flight range. The flight range refers to the range of operating conditions during which the low pitch stop limit decreases the blade angle. This means that in the flight range, the propeller blades can be adjusted to a lower pitch, allowing for more efficient operation at lower speeds or during takeoff and landing. The other options, alpha range, beta range, and synchrophasing range, do not specifically relate to the low pitch stop limit or decreasing blade angle.

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  • 17. 

    When is the condition lever released to the run position?

    • During air start

    • During ground start

    • When rpm decreases

    • When rpm reaches light off

    Correct Answer
    A. When rpm reaches light off
    Explanation
    The condition lever is released to the run position when the RPM reaches light off. This indicates that the engine has reached a sufficient speed for ignition and is ready to operate normally. Releasing the condition lever at this point allows for the fuel flow to be adjusted and the engine to continue running smoothly.

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  • 18. 

    When propellers are rotating at different speeds, what tends to rise and fall?

    • Rpm and fuel flow

    • Fuel flow and blade pitch

    • Noise and vibration levels

    • Vibration and blade pitch

    Correct Answer
    A. Noise and vibration levels
    Explanation
    When propellers are rotating at different speeds, the noise and vibration levels tend to rise and fall. This is because the imbalance in rotational speeds causes uneven forces and disturbances in the propellers, resulting in increased noise and vibration.

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  • 19. 

    What component corrects the propellers to obtain the best phase angle relationship between the master and slaves?

    • Synchrophaser unit

    • PCU

    • PUAD

    • GMAD

    Correct Answer
    A. Synchrophaser unit
    Explanation
    The synchrophaser unit is the component that corrects the propellers to obtain the best phase angle relationship between the master and slaves. It ensures that the propellers are synchronized and working in harmony, optimizing their performance and efficiency. The synchrophaser unit adjusts the phase angle to minimize any imbalances or discrepancies between the propellers, allowing for smooth and coordinated operation.

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  • 20. 

    Which propeller governing mode provides the foundation for two other propeller governing modes?

    • Mechanical governing

    • Electrical governing

    • Hydraulic governing

    • Throttle governing

    Correct Answer
    A. Mechanical governing
    Explanation
    Mechanical governing provides the foundation for two other propeller governing modes, namely electrical governing and hydraulic governing. Mechanical governing involves the use of mechanical linkages and mechanisms to control the pitch of the propeller blades. This mode forms the basis for the development of more advanced governing systems that utilize electrical or hydraulic systems to control the propeller pitch.

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  • 21. 

    In the mechanical governing mode, what directly affects all propeller govenor control?

    • Linkage on the flywieghts

    • Torque on the speeder spring

    • Angle of the flywieghts

    • Linkage on the speeder spring

    Correct Answer
    A. Linkage on the speeder spring
    Explanation
    The correct answer is "linkage on the speeder spring". In the mechanical governing mode, the speeder spring is responsible for controlling the fuel flow to the engine. The linkage on the speeder spring directly affects the position and tension of the spring, which in turn determines the amount of fuel being supplied to the engine. Therefore, any adjustments or changes made to the linkage on the speeder spring will directly impact the governor control and consequently affect the propeller's speed and performance.

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  • 22. 

    When the throttle is moved and a signal is sent to the synchrophaser unit, what component changes speeder spring force to the pilot valve?

    • Speed sensitive valve

    • Speed bias motor

    • Speed sensitive control

    • Speed bias control

    Correct Answer
    A. Speed bias motor
    Explanation
    The speed bias motor is the component that changes the speeder spring force to the pilot valve when a signal is sent to the synchrophaser unit. It is responsible for adjusting the spring force based on the throttle position, allowing for precise control of the engine speed. The speed sensitive valve, speed sensitive control, and speed bias control are not directly involved in changing the speeder spring force to the pilot valve.

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  • 23. 

    When is indexing the synchrophaser system normally required?

    • If a syncrophaser is replaced

    • If a PCU is replaced

    • If a PUAD is replaced

    • If a GMAD is replaced

    Correct Answer
    A. If a syncrophaser is replaced
    Explanation
    When a synchrophaser is replaced, indexing the synchrophaser system is normally required. This is because the synchrophaser is a crucial component of the system that ensures synchronization and coordination between different devices. Replacing the synchrophaser may disrupt the system's functionality, and indexing is necessary to recalibrate and align the new synchrophaser with the rest of the system.

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  • 24. 

    What are some methods used for inspecting a propeller?

    • Visual, dimensional, and special

    • Purple dye, visual, blade depth

    • Special, purple dye, and dimensional

    • Dimensional, blade depth, and visual

    Correct Answer
    A. Visual, dimensional, and special
    Explanation
    The correct answer is visual, dimensional, and special. When inspecting a propeller, visual inspection is important to identify any visible damage or wear. Dimensional inspection involves taking measurements to ensure that the propeller meets the required specifications. Special inspection techniques may be used for specific purposes, such as using purple dye to detect cracks or other defects. These methods together provide a comprehensive inspection of the propeller.

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  • 25. 

    Which inspection method would be used if you were required to check the pulse generator for propeller clearance?

    • Special

    • Dimensional

    • Purple dye

    • Blade indicator

    Correct Answer
    A. Dimensional
    Explanation
    The correct answer is "dimensional." In order to check the pulse generator for propeller clearance, a dimensional inspection method would be used. This method involves measuring the dimensions of the pulse generator to ensure that it meets the required specifications and has the appropriate clearance for the propeller. Other inspection methods such as special, purple dye, or blade indicator would not be suitable for this specific task.

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  • 26. 

    Which inspection method could be used if minute cracks are suspected on the propeller blade?

    • Purple dye

    • Special

    • Dimensional

    • Blade indicator

    Correct Answer
    A. Special
    Explanation
    The special inspection method would be used if minute cracks are suspected on the propeller blade. This method is specifically designed to detect and identify any small cracks that may be present. The other options, such as purple dye, dimensional, and blade indicator, may be used for different types of inspections or to measure specific dimensions, but they would not be suitable for detecting minute cracks on the propeller blade.

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  • 27. 

    When performing the fluid leakage inspection, what is the hydraulic fluid leak lmit from the control assembly, whether it is running or static?

    • 1 drop/45 sec

    • 3 drop/45 sec

    • 5 drop/45 sec

    • 7 drop/45 sec

    Correct Answer
    A. 1 drop/45 sec
    Explanation
    The correct answer is 1 drop/45 sec. This means that during the fluid leakage inspection, the hydraulic fluid leak from the control assembly should not exceed 1 drop every 45 seconds, whether the assembly is running or static. This standard helps ensure that the control assembly is functioning properly and does not have any significant fluid leaks that could affect its performance or safety.

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  • 28. 

    What must you do if there is an unexplained loss of fluid?

    • Perform a consumption check

    • R2 the shaft seal

    • Verify the 781H

    • R2 the propeller assembly

    Correct Answer
    A. R2 the shaft seal
    Explanation
    If there is an unexplained loss of fluid, the correct action to take is to r2 the shaft seal. This means that you need to inspect and potentially replace the shaft seal, as it may be the source of the fluid loss. By doing this, you can identify and address any issues with the seal, preventing further loss of fluid and potential damage to the system.

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  • 29. 

    What must you do if the impact caused the propeller to stop rotating?

    • R2 the propeller assembly

    • R2 the hub mounting bulkhead

    • R2 the blade segment gear

    • R2 the propeller afterbodies

    Correct Answer
    A. R2 the propeller assembly
    Explanation
    If the impact caused the propeller to stop rotating, the correct action to take would be to remove and replace the propeller assembly.

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  • 30. 

    The direction in which you file a blade depends on what?

    • Where the damage is on the blade

    • The angle of the blade damage

    • The length of blade damage

    • The depth of the blade damage

    Correct Answer
    A. Where the damage is on the blade
    Explanation
    The direction in which you file a blade depends on where the damage is on the blade.

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  • 31. 

    If the repair depth exceeds the allowable limits after you repair the metal damage, what must you do?

    • Remove the blade

    • R2 the beta set gear

    • R2 the entire assembly

    • R2 the hub mounting bulkhead

    Correct Answer
    A. R2 the entire assembly
    Explanation
    If the repair depth exceeds the allowable limits after the metal damage is repaired, the best course of action is to R2 (replace and reinstall) the entire assembly. This means that the damaged assembly should be completely replaced with a new one, ensuring that the repair depth remains within the allowable limits. This is necessary to maintain the structural integrity and safety of the equipment.

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  • 32. 

    What is the difference between repairing a weather crack that is less than 0.070 inch and repairing one that exceeds the limit?

    • R2 the blade

    • R2 the entire assembly

    • Stop drill the crack

    • Install a "patch" on the blade

    Correct Answer
    A. Install a "patch" on the blade
    Explanation
    Installing a "patch" on the blade is the difference between repairing a weather crack that is less than 0.070 inch and repairing one that exceeds the limit. This suggests that when the crack is smaller than 0.070 inch, it can be repaired without the need for a patch. However, when the crack exceeds this limit, a patch needs to be installed on the blade to properly repair it.

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  • 33. 

    How does blade heater is not visible, how can it be located?

    • Multimeter set to ohms

    • Multimeter set to amp

    • ESS system tester

    • SSC system tester

    Correct Answer
    A. Multimeter set to ohms
    Explanation
    The blade heater is not visible because it is an internal component of a device or system. However, it can be located by using a multimeter set to ohms. The multimeter measures resistance, so by connecting the probes to the appropriate terminals or contacts related to the blade heater, it is possible to determine its presence and functionality. The resistance reading on the multimeter will indicate whether the blade heater is functioning properly or not.

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  • 34. 

    How does blade heater damage usually result?

    • Overheating and poor mx

    • Fod damage and poor mx

    • Overheating and fod damage

    • Fod damage and below temperature conditions

    Correct Answer
    A. Overheating and fod damage
    Explanation
    Blade heater damage usually results from a combination of overheating and foreign object damage (FOD). Overheating can cause the blade heater to become damaged due to excessive heat, leading to malfunctions or failure. Additionally, FOD, such as debris or foreign objects, can cause physical damage to the blade heater, affecting its performance and potentially causing further damage. Therefore, the correct answer is overheating and FOD damage.

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  • 35. 

    Why do dome piston seals have to be replaced?

    • They are a time change item

    • They are easily cut during installation

    • They dissolve rapidly

    • They "fall" into the system regularly

    Correct Answer
    A. They are a time change item
    Explanation
    Dome piston seals have to be replaced because they are a time change item. This means that they have a limited lifespan and need to be replaced periodically to ensure the proper functioning of the system. Over time, these seals can wear out or become damaged, leading to leaks or other issues. Therefore, regular replacement is necessary to maintain the efficiency and reliability of the system.

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  • 36. 

    What can the vibrations produced by an unbalanced propeller do to an engine mount or a propeller shaft, if they are intense enough?

    • They could fod out the engine

    • They could crack or break

    • They can be re-balanced within limits

    • They can be reset and re-blended to be set as servicable

    Correct Answer
    A. They could crack or break
    Explanation
    Intense vibrations produced by an unbalanced propeller can potentially cause damage to an engine mount or a propeller shaft. These vibrations can be strong enough to cause cracks or even break these components.

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  • 37. 

    Where does the anaylzer recieve its two inputs?

    • Velocimeter and pizeoelectric meter

    • Pizeoelectric meter and PMG output

    • PMG output and velocimeter

    • Velocimeter and PMG output

    Correct Answer
    A. PMG output and velocimeter
    Explanation
    The analyzer receives its two inputs from the PMG output and the velocimeter.

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  • 38. 

    How is the output of the velocimeter that is sent to the analyzer measured?

    • IPS

    • PMG

    • GMAD

    • PUAD

    Correct Answer
    A. IPS
    Explanation
    The output of the velocimeter that is sent to the analyzer is measured in IPS (Inches Per Second). This unit of measurement indicates the speed or velocity at which the object being measured is moving. The velocimeter records the movement and converts it into a measurement in inches per second, providing information about the velocity of the object.

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  • 39. 

    How is the angular position provided by the magnetic pulse generator measured?

    • Temp degrees

    • Angle degrees

    • Depth degrees

    • Blend degrees

    Correct Answer
    A. Angle degrees
    Explanation
    The angular position provided by the magnetic pulse generator is measured in angle degrees. This means that the measurement is being taken in terms of the angle formed between the reference point and the position being measured. The magnetic pulse generator likely uses magnetic pulses to determine the angular position, and the measurement is given in degrees to provide a specific and standardized unit for the angular position.

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  • 40. 

    How and where should the velocimeter be secured to the forward side of the RGB?

    • Horizontally at 6 oclock

    • Vertically at 6 oclock

    • Horizontally at 9 oclock

    • Vertically at 9 oclock

    Correct Answer
    A. Horizontally at 9 oclock
    Explanation
    The velocimeter should be secured horizontally at 9 o'clock on the forward side of the RGB. This means that it should be positioned in a way that the instrument is parallel to the ground and the 9 o'clock position on a clock face. This positioning allows for accurate measurement of velocity and ensures that the instrument is properly aligned with the direction of movement.

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  • 41. 

    When balancing more than one propeller, why should you label the end of the velocimeter cables with its respective propeller number?

    • To properly balance the propeller angles

    • To verify correct cable thickness

    • To ensure cable ends are connected properly

    • To verify correct output of cables

    Correct Answer
    A. To ensure cable ends are connected properly
    Explanation
    Labeling the end of the velocimeter cables with its respective propeller number helps to ensure that the cable ends are connected properly. This is important because if the cables are not connected correctly, it can lead to inaccurate readings from the velocimeter. By labeling the cables, it becomes easier to identify and match the correct cable with the corresponding propeller, minimizing the chances of incorrect connections. This ensures that the velocimeter is functioning accurately and providing reliable data for balancing the propellers.

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  • 42. 

    Why is the PB/PMS being installed on newer acft?

    • To monitor exhaust gas temp

    • To monitor intake gas temp

    • To monitor compressor ratio

    • To ensure proper dynamic balancing

    Correct Answer
    A. To ensure proper dynamic balancing
    Explanation
    The PB/PMS (Power Balance/Power Management System) is being installed on newer aircraft to ensure proper dynamic balancing. This system helps in maintaining the balance of power between different engines or components of the aircraft, ensuring optimal performance and reducing vibrations. By monitoring and managing the power distribution, the PB/PMS helps to prevent any imbalance that could lead to mechanical issues or decreased efficiency.

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  • 43. 

    What protects the leading edge of the propeller blades?

    • Nickel leading edge gaurd

    • Aluminum leading edge gaurd

    • Nickel trailing edge gaurd

    • Aluminum trailing edge gaurd

    Correct Answer
    A. Nickel leading edge gaurd
    Explanation
    The leading edge of the propeller blades is protected by a nickel leading edge guard. This guard is specifically designed to prevent damage to the propeller blades, such as erosion or impact from foreign objects. Nickel is a durable and corrosion-resistant material, making it suitable for this purpose. It helps to maintain the integrity and performance of the propeller blades by shielding them from potential hazards during operation.

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  • 44. 

    When more oil is delivered to the aft side of the piston, in whcih direction does the piston move?

    • Forward towards max reverse

    • Backward towards max reverse

    • Foward towards full feather

    • Backward towards full feather

    Correct Answer
    A. Forward towards max reverse
    Explanation
    When more oil is delivered to the aft side of the piston, the piston moves forward towards max reverse. This is because the increased oil pressure on the aft side creates a force that pushes the piston in the forward direction.

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  • 45. 

    What component gives an indication to the aircrew if the GBE valve is not in flight position for the flight condition?

    • Temperature switch

    • Fuel sov

    • Pressure switch

    • Filter bypass switch

    Correct Answer
    A. Pressure switch
    Explanation
    The pressure switch is the component that gives an indication to the aircrew if the GBE valve is not in flight position for the flight condition. This switch is designed to detect the pressure in the system and provide a signal if it falls below or exceeds the desired range. In this case, if the GBE valve is not in the correct position, it would result in abnormal pressure readings, triggering the pressure switch and alerting the aircrew of the issue.

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  • 46. 

    Where is the auxillary feather pump located?

    • Forward of the PCU

    • Behind the PCU

    • Forward of the GMAD

    • Behind the GMAD

    Correct Answer
    A. Behind the GMAD
    Explanation
    The auxiliary feather pump is located behind the GMAD (Generator Control Unit).

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  • 47. 

    During beta/ground operation, what is the normal ground idle propeller speed?

    • 1,015.0 rpm

    • 1,050.1 rpm

    • 1,010.5 rpm

    • 1,051.0 rpm

    Correct Answer
    A. 1,010.5 rpm
    Explanation
    During beta/ground operation, the normal ground idle propeller speed is 1,010.5 rpm.

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  • 48. 

    What is the propeller deicing duty cycle?

    • 78 seconds on, 12 seconds off

    • 12 seconds on, 78 seconds off

    • 17 seconds on, 28 seconds off

    • 28 seconds on, 17 seconds off

    Correct Answer
    A. 12 seconds on, 78 seconds off
    Explanation
    The propeller deicing duty cycle refers to the pattern of time intervals during which the deicing system is activated and deactivated. In this case, the correct answer is "12 seconds on, 78 seconds off", indicating that the deicing system is turned on for 12 seconds and then turned off for 78 seconds. This duty cycle allows for periodic activation of the deicing system to prevent ice buildup on the propeller while allowing for longer intervals of non-operation.

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  • 49. 

    What are some uses for the air that is bled from the SGT engine?

    • Operate large class equipment, age, and remove snow/ice

    • Remove snow/ice, operate all equipment, inflate acft tires

    • Inflate acft tires, remove snow/ice operate large class equipment

    • Operate all equipment, remove snow/ice, and age

    Correct Answer
    A. Operate large class equipment, age, and remove snow/ice
    Explanation
    The air that is bled from the SGT engine can be used to operate large class equipment, such as air compressors or generators. It can also be used to age certain materials or components, as well as to remove snow and ice from aircraft surfaces.

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Quiz Review Timeline (Updated): Mar 17, 2023 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 17, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Apr 05, 2012
    Quiz Created by
    AerospacePropuls

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