2A651 Edition2 Volume 5

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  • 1/95 Questions

    (833) Which inspection is conducted by maintenance personnel after an occurrence of a specific or unusual condition?

    • Special.
    • Calendar.
    • Acceptance.
    • Time replacement item.
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About This Quiz

This quiz, titled '2a651 edition2 volume 5', assesses skills in aircraft engine troubleshooting. It focuses on practical scenarios like observing gauge indications, prioritizing unit repairs, and using troubleshooting charts, aiming to enhance expertise in understanding aircraft systems.

2A651 Edition2 Volume 5 - Quiz

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  • 2. 

    (803) An understanding of the operating principles of engine instruments will help you decide

    • If an engine should be removed from an aircraft.

    • If the engine should be sent to the test cell.

    • The meanings of the instrument readings.

    • What tools are required for maintenance.

    Correct Answer
    A. The meanings of the instrument readings.
    Explanation
    An understanding of the operating principles of engine instruments is important in order to interpret the readings provided by these instruments. By understanding the meanings of the instrument readings, one can determine the performance and condition of the engine. This knowledge is necessary to make informed decisions about whether an engine should be removed from an aircraft or sent to the test cell for further examination and maintenance.

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  • 3. 

    (805) The engine fuel-flow indicating system of most jet powered aircraft contains a fuel-flow

    • Transmitter and a float valve.

    • Control valve and a float valve.

    • Transmitter and a fuel-flow indicator.

    • Control valve and a fuel-flow transcriber.

    Correct Answer
    A. Transmitter and a fuel-flow indicator.
    Explanation
    The engine fuel-flow indicating system of most jet powered aircraft contains a fuel-flow transmitter and a fuel-flow indicator. This system is responsible for measuring and displaying the rate at which fuel is flowing into the engine. The fuel-flow transmitter measures the flow of fuel and sends this information to the fuel-flow indicator, which then displays the data to the pilot. This allows the pilot to monitor the fuel consumption and make any necessary adjustments during the flight.

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  • 4. 

    (826) Immediately prior to an engine test cell run, you should check the engine and quick engine change (QEC) kit (if applicable) for loose nuts, bolts, lock wire, tools, or any other material in order to help

    • Eliminate items that could possibly cause foreign object damage (FOD).

    • Assure that the instrumentation is working properly.

    • Prevent wasted maintenance hours due to shutdown.

    • Eliminate items that could cause inaccurate readings.

    Correct Answer
    A. Eliminate items that could possibly cause foreign object damage (FOD).
    Explanation
    The correct answer is to eliminate items that could possibly cause foreign object damage (FOD). This is important because loose nuts, bolts, lock wire, tools, or any other material left in the engine or quick engine change (QEC) kit could potentially get sucked into the engine during the test run, causing damage to the engine and potentially leading to a catastrophic failure. By checking and removing any loose items before the test, the risk of FOD is minimized, ensuring the safety and proper functioning of the engine.

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  • 5. 

    (828) Responsibility for the proper preventive maintenance of a test cell facility rests with the

    • Individuals assigned.

    • Civil engineer squadron.

    • Equipment maintenance squadron.

    • Aerospace ground equipment (AGE) flight.

    Correct Answer
    A. Individuals assigned.
    Explanation
    The correct answer is "individuals assigned". This means that the responsibility for the proper preventive maintenance of a test cell facility rests with the individuals who have been assigned to that task. It implies that there is no specific unit or squadron designated for this responsibility, but rather it is the duty of the individuals who have been assigned to the test cell facility.

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  • 6. 

    (801) To become an expert troubleshooter, you must

    • Be a 7-level.

    • Have at least 5 years experience.

    • Attend college courses in troubleshooting techniques.

    • Understand the function of each unit within each system.

    Correct Answer
    A. Understand the function of each unit within each system.
    Explanation
    To become an expert troubleshooter, it is important to understand the function of each unit within each system. This means having a comprehensive knowledge and understanding of how each component within a system works and interacts with other components. This knowledge allows troubleshooters to accurately diagnose and fix issues that may arise within a system. While being a 7-level, having at least 5 years of experience, and attending college courses in troubleshooting techniques may contribute to becoming an expert troubleshooter, understanding the function of each unit within each system is the most essential factor in achieving expertise.

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  • 7. 

    (803) Most engine monitoring gauges and instruments require some type of

    • Electrical valve to the indicator.

    • Metal tubing for electron flow.

    • Radio frequency transmitter.

    • Transmitter and indicator.

    Correct Answer
    A. Transmitter and indicator.
    Explanation
    Most engine monitoring gauges and instruments require a transmitter and indicator because these devices work together to measure and display various parameters of the engine. The transmitter converts the physical measurements into electrical signals, which are then transmitted to the indicator. The indicator receives these signals and displays the readings on the gauge or instrument panel. Therefore, both the transmitter and indicator are necessary components for accurate engine monitoring.

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  • 8. 

    (804) A typical jet engine exhaust gas temperature (EGT) indicating system contains thermocouples, leads, an indicator, and

    • Resistor.

    • Turbine inlet.

    • Control valve

    • Exhaust duct.

    Correct Answer
    A. Resistor.
    Explanation
    A typical jet engine exhaust gas temperature (EGT) indicating system contains a resistor. The resistor is used to measure the temperature of the exhaust gas. The thermocouples and leads are used to sense the temperature and transmit the signal to the indicator. The indicator then displays the temperature reading. The turbine inlet and control valve are not directly related to the EGT indicating system.

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  • 9. 

    (809) During an operational check of the fire warning system, you press

    • Only the TEST switch

    • Both TEST and NORMAL switches

    • Only the TEST WARNING ON switch.

    • Both TEST ON and TEST OFF switches.

    Correct Answer
    A. Only the TEST switch
    Explanation
    Pressing only the TEST switch during the operational check of the fire warning system is the correct answer. This is because the TEST switch is specifically designed to initiate a test of the system, allowing the operator to verify its functionality. Pressing both the TEST and NORMAL switches or only the TEST WARNING ON switch would not provide a comprehensive test of the system. Pressing both the TEST ON and TEST OFF switches is not a valid option as there is no mention of these switches in the question.

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  • 10. 

    (827) When making general entries on the test cell engine log sheet, what should you do with the engine model and serial number?

    • Type these items.

    • Check past records.

    • Enter these only after test is complete.

    • Verify these numbers on the engine data plate.

    Correct Answer
    A. Verify these numbers on the engine data plate.
    Explanation
    When making general entries on the test cell engine log sheet, it is important to verify the engine model and serial number on the engine data plate. This ensures that the correct information is recorded and avoids any mistakes or discrepancies in the log sheet. Checking past records may provide some reference, but it is crucial to verify the numbers on the engine data plate to ensure accuracy. Entering these numbers only after the test is complete may lead to errors if the wrong numbers are recorded during the test.

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  • 11. 

    (834) Careless operation of the throttle during emergency system operation could cause a compressor stall due to

    • A restricted air inlet.

    • Rapid throttle movement.

    • A restricted turbine nozzle.

    • Malfunctioning variable geometry system.

    Correct Answer
    A. Rapid throttle movement.
    Explanation
    Rapid throttle movement can cause a compressor stall during emergency system operation. This is because sudden and excessive changes in throttle position can disrupt the airflow through the engine, leading to a loss of compressor efficiency and potentially causing the compressor to stall.

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  • 12. 

    (801) After reviewing the aircraft/engine forms, where should you begin troubleshooting?

    • Examine most complex unit.

    • Observe gauge indications.

    • Check each part of every system.

    • Discuss problem with other journeymen in the shop.

    Correct Answer
    A. Observe gauge indications.
    Explanation
    To begin troubleshooting after reviewing the aircraft/engine forms, one should observe gauge indications. This is because gauge indications provide valuable information about the performance and condition of various systems in the aircraft/engine. By observing the gauge indications, one can identify any abnormal readings or discrepancies that may indicate a problem or malfunction. This is a logical starting point as it allows for a systematic approach to identifying and resolving any issues.

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  • 13. 

    (801) If you encounter engine trouble where more than one unit is at fault, you would first

    • Go back and check engine forms again.

    • Replace all the units suspected to be at fault.

    • Try to repair the more complex unit on the spot.

    • Examine the unit that requires the least amount of time to replace.

    Correct Answer
    A. Examine the unit that requires the least amount of time to replace.
    Explanation
    The correct answer is to examine the unit that requires the least amount of time to replace. This is because when encountering engine trouble where more than one unit is at fault, it is more efficient to start by examining and potentially replacing the unit that can be replaced quickly. This allows for a quicker diagnosis and resolution of the problem, and if it does not fix the issue, then further examination and replacement of other units can be done.

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  • 14. 

    (803) To be considered effective tools for aviators, aircraft instruments must be light weight, easy to read, and

    • Small in size.

    • Analog readout

    • Digital readout.

    • Cheap to manufacture.

    Correct Answer
    A. Small in size.
    Explanation
    Aircraft instruments need to be small in size in order to be considered effective tools for aviators. This is because space is limited in an aircraft cockpit, and there are numerous instruments that need to be installed. Therefore, having small instruments allows for efficient use of space and ensures that all necessary instruments can be accommodated without cluttering the cockpit. Additionally, small instruments are also easier to read and manipulate, which is crucial for pilots who need to quickly and accurately interpret the information provided by the instruments while flying.

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  • 15. 

    (804) Which metals are used in the thermocouples of the exhaust gas temperature (EGT) indicating system?

    • Steel and iron.

    • Steel and alumel.

    • Iron and chromel.

    • Alumel and chromel.

    Correct Answer
    A. Alumel and chromel.
    Explanation
    Alumel and chromel are used in the thermocouples of the exhaust gas temperature (EGT) indicating system. These metals are commonly used in thermocouples due to their high temperature resistance and good electrical conductivity. Alumel is an alloy of nickel, manganese, aluminum, and silicon, while chromel is an alloy of nickel and chromium. The combination of these two metals allows for accurate temperature measurement in high-temperature environments such as exhaust systems.

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  • 16. 

    (807) The two primary units of the tachometer indicating system are the tachometer generator and tachometer

    • Indicator

    • Fuse panel.

    • Transformer.

    • Thermocouple.

    Correct Answer
    A. Indicator
    Explanation
    The tachometer indicating system consists of two primary units: the tachometer generator and the indicator. The tachometer generator is responsible for generating electrical signals based on the rotational speed of the engine, while the indicator is the device that displays the speed on the tachometer. Therefore, the correct answer is "indicator".

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  • 17. 

    (814) The filter selector switch on the vibration analyzer is used to

    • Provide an exact revolutions per minute (rpm) indication.

    • Indicate the amplitude of the overall vibration.

    • Display the frequency of the overall engine.

    • Allow selection of the necessary filter.

    Correct Answer
    A. Allow selection of the necessary filter.
    Explanation
    The filter selector switch on the vibration analyzer allows the user to choose the appropriate filter for analyzing the vibration data. Different filters are used to isolate specific frequencies or ranges of frequencies, allowing for a more accurate assessment of the vibration characteristics. By selecting the necessary filter, the user can focus on the specific vibration components of interest and eliminate any unwanted noise or interference.

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  • 18. 

    (826) Prior to conducting a test cell run, you must determine the specific engine’s correct type and grade of oil used, which can be found in the

    • Test cell oil formulas.

    • Base engine manager’s office.

    • Applicable engine publications.

    • Periodic checklist for the engine.

    Correct Answer
    A. Applicable engine publications.
    Explanation
    To determine the specific engine's correct type and grade of oil used, one should refer to the applicable engine publications. These publications contain the necessary information regarding the engine's oil requirements and specifications. It is important to consult these publications to ensure that the correct oil is used during the test cell run, as using the wrong type or grade of oil could potentially damage the engine. The base engine manager's office may have some information, but the most accurate and up-to-date information can be found in the applicable engine publications. The test cell oil formulas and periodic checklist for the engine may not provide the specific information required for determining the correct type and grade of oil.

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  • 19. 

    (801) Aircraft power plant and engine intermediate maintenance technical orders (TO) contain information on troubleshooting. This information is presented in the form of

    • Troubleshooting charts.

    • Mechanical drawings.

    • Power plant charts.

    • Fix-it diagrams.

    Correct Answer
    A. Troubleshooting charts.
    Explanation
    Aircraft power plant and engine intermediate maintenance technical orders (TO) contain troubleshooting charts. These charts provide a step-by-step guide to identify and resolve issues with the power plant and engine systems. They help maintenance personnel diagnose and fix problems efficiently by providing a systematic approach to problem-solving. Troubleshooting charts typically include a series of questions or steps to follow, leading the user to the most likely cause of the issue and suggesting appropriate corrective actions.

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  • 20. 

    (802) What system is used on most modern jet engines to gather and record engine data?

    • Engine start system (ESS).

    • Engine monitoring system (EMS).

    • Supervisory control system (SCS).

    • Supervisory monitoring system (SMS).

    Correct Answer
    A. Engine monitoring system (EMS).
    Explanation
    The correct answer is Engine monitoring system (EMS). This system is used on most modern jet engines to gather and record engine data. It allows for real-time monitoring of various engine parameters such as temperature, pressure, and fuel consumption. This data is then recorded and analyzed to ensure optimal engine performance and detect any potential issues or malfunctions. The EMS plays a crucial role in maintaining the safety and efficiency of jet engines.

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  • 21. 

    (813) Which type of vibration transducer is made up of certain ceramic compounds and natural crystals?

    • Velocity.

    • Phase log.

    • Displacement accelerometer.

    • Piezoelectric accelerometer.

    Correct Answer
    A. Piezoelectric accelerometer.
    Explanation
    A piezoelectric accelerometer is made up of certain ceramic compounds and natural crystals. These materials have the property of generating an electric charge when subjected to mechanical stress or vibration. This electric charge is then converted into an electrical signal that can be measured and analyzed to determine the level and frequency of the vibration. Therefore, a piezoelectric accelerometer is the correct type of vibration transducer that is made up of certain ceramic compounds and natural crystals.

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  • 22. 

    (819) Where are the primary silencers positioned on an aircraft noise suppressor?

    • Near the bleed area.

    • To the rear exhaust area.

    • Against the aircraft fuselage.

    • Forward of the bleed exhaust area.

    Correct Answer
    A. Against the aircraft fuselage.
    Explanation
    The primary silencers on an aircraft noise suppressor are positioned against the aircraft fuselage. This means that they are located next to or in contact with the outer structure of the aircraft.

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  • 23. 

    (821) What hush house feature allows for flexibility when you are running an engine that has been removed from the airframe?

    • Tailhook connects to the engine.

    • Wheel chocks restrain the engine.

    • The thrust stand slides into position on tracks.

    • Engines are run while on the ALC 3000 trailer.

    Correct Answer
    A. The thrust stand slides into position on tracks.
    Explanation
    The thrust stand sliding into position on tracks allows for flexibility when running an engine that has been removed from the airframe. This feature allows the engine to be securely positioned and tested while providing the ability to adjust its position as needed.

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  • 24. 

    (826) Which of these is not considered a cause of foreign object damage (FOD)?

    • Ingestion of bolts.

    • Formation of ice.

    • Ingestion of rocks.

    • Failure of internal parts.

    Correct Answer
    A. Failure of internal parts.
    Explanation
    Foreign object damage (FOD) refers to the damage caused to an aircraft or its components due to the presence of foreign objects. Ingestion of bolts, formation of ice, and ingestion of rocks are all examples of foreign objects that can cause FOD. However, the failure of internal parts is not considered a cause of FOD. FOD typically occurs when foreign objects come into contact with the aircraft during operation, causing damage to its structure or systems. Internal part failures, on the other hand, are typically caused by mechanical or electrical issues within the aircraft itself, rather than external objects.

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  • 25. 

    (826) In what step of a test cell leak check do you accomplish a final check for leaks?

    • Start-up.

    • Starter motoring.

    • During engine coast down.

    • During fuel-flow indication.

    Correct Answer
    A. During engine coast down.
    Explanation
    During engine coast down, a final check for leaks is accomplished in a test cell leak check. This step involves observing the engine as it slows down after being shut off, and checking for any signs of leaks or abnormal fluid levels. This is an important step to ensure that there are no leaks in the test cell, which could affect the accuracy of the test results and potentially cause damage to the equipment.

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  • 26. 

    (828) How often are service inspections conducted on the test cell?

    • Daily

    • Hourly

    • Weekly

    • Monthly

    Correct Answer
    A. Daily
    Explanation
    Service inspections are conducted on the test cell on a daily basis. This means that the inspections occur every day, ensuring that the test cell is regularly checked for any issues or maintenance needs. Conducting daily service inspections helps to ensure the proper functioning and safety of the test cell, allowing any problems to be identified and addressed promptly.

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  • 27. 

    (830) Which one of these inspections is a flight preparedness check?

    • Periodic.

    • Preflight.

    • Thruflight.

    • End-of-runway.

    Correct Answer
    A. Preflight.
    Explanation
    A preflight inspection is a flight preparedness check conducted before each flight to ensure that the aircraft is in proper condition and ready for operation. It involves a thorough examination of various components, systems, and documentation to verify their functionality and compliance with safety regulations. This inspection is crucial for identifying any potential issues or discrepancies that could affect the safety and performance of the aircraft during flight. Therefore, preflight is the correct answer as it accurately represents the inspection conducted to ensure flight preparedness.

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  • 28. 

    (812) What kind of engine vibration does not persist, but comes and goes?

    • Forced.

    • Transient.

    • Resonance.

    • Externally excited.

    Correct Answer
    A. Transient.
    Explanation
    Transient engine vibration refers to vibrations that occur intermittently or sporadically, rather than persistently. These vibrations may come and go, and are typically caused by temporary factors such as changes in engine load or operating conditions. Unlike resonance vibrations, which occur at specific frequencies, transient vibrations do not have a consistent pattern or frequency. Similarly, externally excited vibrations are caused by external factors such as road conditions or wind, whereas transient vibrations can originate from within the engine itself.

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  • 29. 

    (814) When you are using a vibration analyzer, you will be notified when a preset signal has been exceeded by

    • A horn alarm.

    • Flashing red lights.

    • The sound of a buzzer.

    • Flashing channel indicator light emitting diode (LED).

    Correct Answer
    A. Flashing channel indicator light emitting diode (LED).
    Explanation
    When using a vibration analyzer, a preset signal is exceeded, the user will be notified by a flashing channel indicator light emitting diode (LED).

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  • 30. 

    (816) When operating an engine that is installed on aircraft, position the aircraft so the wind is blowing

    • At an unnoticeable level

    • Directly into the inlet, within 45ï‚°.

    • At a 90ï‚° angle to the engine exhaust.

    • Directly into the exhaust, within 45ï‚°.

    Correct Answer
    A. Directly into the inlet, within 45.
    Explanation
    When operating an engine that is installed on an aircraft, it is important to position the aircraft so that the wind is blowing directly into the inlet, within ±45°. This is because the inlet is designed to take in air for the engine's combustion process, and having the wind blow directly into the inlet helps to ensure a proper air-to-fuel mixture. Additionally, positioning the aircraft within ±45° allows for some flexibility in wind direction while still maintaining an effective airflow into the engine.

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  • 31. 

    (826) Which engine area should be checked for foreign object damage (FOD) prior to operation on the test cell facility?

    • Fuel control.

    • Turbine area.

    • Inlet to the oil pump.

    • Inlet to the fuel pump.

    Correct Answer
    A. Turbine area.
    Explanation
    The turbine area should be checked for foreign object damage (FOD) prior to operation on the test cell facility. This is because the turbine area is a critical component of the engine and any foreign objects, such as debris or particles, can cause damage and affect the performance and safety of the engine. Therefore, it is important to inspect and ensure that the turbine area is free from any FOD before operating the engine.

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  • 32. 

    (807) The frequency of the tachometer generator is proportional to the

    • Engine speed.

    • Transformer speed.

    • Speed of the electrical magnet.

    • Speed of the alternating magnet.

    Correct Answer
    A. Engine speed.
    Explanation
    The tachometer generator is a device that measures the speed of an engine. It generates a frequency signal that is proportional to the engine speed. Therefore, the correct answer is "engine speed" as the frequency of the tachometer generator directly corresponds to the speed of the engine.

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  • 33. 

    (836) Which characteristic is the most common cause of bearing failure?

    • Transient vibration

    • Partial loss of lubrication.

    • Complete loss of lubrication.

    • Stall condition over temperature.

    Correct Answer
    A. Complete loss of lubrication.
    Explanation
    Complete loss of lubrication is the most common cause of bearing failure. Bearings rely on lubrication to reduce friction and prevent excessive heat and wear. Without proper lubrication, the bearing surfaces can become damaged, leading to failure. Transient vibration, partial loss of lubrication, and stall condition over temperature can also contribute to bearing failure, but complete loss of lubrication is the most significant factor.

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  • 34. 

    (802) Which component in F100-PW–220 engine monitoring system transfers information from the engine diagnostic unit (EDU) to the ground station unit (GSU)?

    • Data collection unit (DCU).

    • Engine analyzer unit (EAU).

    • Mach number (Mn) test system.

    • Supervisory control system (SCS).

    Correct Answer
    A. Data collection unit (DCU).
    Explanation
    The correct answer is the Data Collection Unit (DCU). The DCU is responsible for collecting and storing data from various components of the engine monitoring system, including the Engine Diagnostic Unit (EDU). It then transfers this information to the Ground Station Unit (GSU) for analysis and monitoring. The DCU plays a crucial role in ensuring that the engine is functioning properly and any issues or abnormalities can be detected and addressed in a timely manner.

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  • 35. 

    (818) Which F–16 operational check allows you to start the jet fuel starter (JFS) without advancing the throttle to idle or supplying fuel to the aircraft engine?

    • Interface operational.

    • Bleed schedule.

    • Dry motoring.

    • Wet motoring

    Correct Answer
    A. Dry motoring.
    Explanation
    Dry motoring is the correct answer because it allows you to start the jet fuel starter (JFS) without advancing the throttle to idle or supplying fuel to the aircraft engine. Dry motoring is a procedure used to test the JFS and ensure its proper functioning without actually starting the engine. This check is important for safety and maintenance purposes.

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  • 36. 

    (823) Which test cell noise suppressors use water to cool the exhaust gases?

    • Fixed.

    • Portable.

    • Both fixed and portable.

    • None.

    Correct Answer
    A. Both fixed and portable.
    Explanation
    Both fixed and portable test cell noise suppressors use water to cool the exhaust gases. This means that regardless of whether the suppressor is a permanent installation or a portable unit, water is used as a cooling mechanism for the exhaust gases.

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  • 37. 

    (835) Turbine blade fatigue failure does not result from

    • Nicks.

    • Dents

    • Blends.

    • Scratches.

    Correct Answer
    A. Blends.
    Explanation
    Turbine blade fatigue failure does not result from blends. This means that the blending process used in manufacturing turbine blades does not contribute to their fatigue failure. Fatigue failure is typically caused by repeated stress and strain on the blades over time, leading to cracks and eventual failure. Nicks, dents, and scratches can potentially weaken the blades and contribute to fatigue failure, but blends do not have this effect.

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  • 38. 

    (810) The term Pt2 means the

    • Total (t) pressure (P) at flange 2 (2).

    • Total (t) pressure (P) at station 2 (2).

    • Temperature (t) and pressure (P) at flange 2 (2).

    • Temperature (t) and pressure (P) at station 2 (2).

    Correct Answer
    A. Total (t) pressure (P) at station 2 (2).
  • 39. 

    (822) In addition to determining the condition of a repaired or overhauled engine, you also test engines

    • For training practice.

    • In aircraft that have been washed.

    • That have been involved in an incident or a mishap.

    • That have severe foreign object damage (FOD) damage.

    Correct Answer
    A. That have been involved in an incident or a mishap.
    Explanation
    Engines that have been involved in an incident or a mishap need to be tested in addition to determining the condition of a repaired or overhauled engine. This is because these engines may have suffered damage or experienced abnormal conditions during the incident or mishap, and it is important to ensure that they are still in proper working order before being used again. Testing these engines helps to identify any potential issues or damage that may have occurred, allowing for necessary repairs or further investigation to be conducted.

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  • 40. 

    (824) Engines are mounted in the fixed test cell on a thrust stand or are suspended

    • By cargo straps.

    • From a cradle mount

    • By a tailhook adapter.

    • On the model 4100 trailer.

    Correct Answer
    A. From a cradle mount
    Explanation
    Engines are mounted from a cradle mount. This means that the engines are suspended or supported by a cradle-like structure. This method of mounting allows for stability and ease of testing, as the engines can be securely held in place while measurements and assessments are conducted.

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  • 41. 

    (827) During a test cell run, if you observe oil on the turbine wheel or oil smoke at or near the turbine section, this is a good indication of

    • A damaged aft bearing oil seal.

    • An underserviced oil system.

    • Leaking external oil lines.

    • A loose aft roller bearing.

    Correct Answer
    A. A damaged aft bearing oil seal.
    Explanation
    If oil is observed on the turbine wheel or oil smoke is seen at or near the turbine section during a test cell run, it is a good indication of a damaged aft bearing oil seal. This suggests that there is a problem with the seal that is allowing oil to escape and potentially causing the smoke. It is important to address this issue to prevent further damage to the turbine system.

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  • 42. 

    (827) If an engine stalls or surges during a test cell run, you should investigate the

    • Ignition exciter.

    • Oil pressure pump.

    • Thrust reverser pump.

    • Variable stator vanes.

    Correct Answer
    A. Variable stator vanes.
    Explanation
    If an engine stalls or surges during a test cell run, the variable stator vanes should be investigated. Variable stator vanes are components in a gas turbine engine that help control the airflow and optimize engine performance. If these vanes are not functioning properly, it can cause disruptions in the airflow, leading to engine stalls or surges. Therefore, it is important to examine the variable stator vanes if such issues occur during a test cell run.

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  • 43. 

    (804) Which jet engine temperature is not measured?

    • Exhaust gas.

    • Turbine inlet.

    • Combustion inlet.

    • Fan turbine inlet.

    Correct Answer
    A. Combustion inlet.
    Explanation
    The combustion inlet temperature is not measured in a jet engine. Temperature measurements are typically taken at the exhaust gas, turbine inlet, and fan turbine inlet. The combustion inlet is the location where fuel is introduced into the engine, and measuring the temperature at this point is not necessary for engine operation or monitoring.

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  • 44. 

    (807) The tachometer indicator is

    • A mechanical magnetic-drag-type instrument.

    • An electric magnetic-drag-type instrument.

    • A mechanical direct-drive-type instrument.

    • An electric direct-drive type instrument.

    Correct Answer
    A. An electric magnetic-drag-type instrument.
    Explanation
    The correct answer is "an electric magnetic-drag-type instrument." This means that the tachometer indicator is an instrument that uses electricity and a magnetic drag mechanism to measure and display the speed of rotation of a motor or engine. This type of tachometer is commonly used in vehicles and other machinery to provide accurate and reliable speed readings.

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  • 45. 

    (815) What are used to support the fan and low-pressure turbine?

    • Bushings.

    • Brackets.

    • Bearings.

    • Blades.

    Correct Answer
    A. Bearings.
    Explanation
    Bearings are used to support the fan and low-pressure turbine. Bearings are mechanical components that reduce friction between moving parts and support the weight of rotating shafts. In this case, bearings are used to support the fan and low-pressure turbine, allowing them to rotate smoothly and efficiently. Bushings, brackets, and blades are not specifically designed for this purpose and would not provide the necessary support and functionality.

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  • 46. 

    (821) Before moving an aircraft into the hush house, you must inspect the aircraft

    • Red streamers.

    • And its forms.

    • Flight station.

    • Forms.

    Correct Answer
    A. And its forms.
    Explanation
    Before moving an aircraft into the hush house, it is necessary to inspect the aircraft and its forms. This means that not only the physical condition of the aircraft needs to be checked, but also any necessary paperwork or documentation related to the aircraft must be reviewed. This ensures that the aircraft is in proper working order and all necessary paperwork is in place before it is moved into the hush house.

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  • 47. 

    (823) A portable test cell is not equipped with a

    • Control cab

    • Thrust trailer

    • Miscellaneous equipment kit.

    • Hydraulically operated pylon mount cradle.

    Correct Answer
    A. Hydraulically operated pylon mount cradle.
    Explanation
    A portable test cell is a mobile unit used for testing engines or other equipment. It is not equipped with a control cab, which is a separate compartment for operating the test cell. It also does not have a thrust trailer, which is used for measuring the thrust produced by the engine. Additionally, it does not come with a miscellaneous equipment kit, which could include various tools and instruments needed for testing. The correct answer is the hydraulically operated pylon mount cradle, which is a device used for mounting the engine or equipment being tested.

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  • 48. 

    (828) What information is used as an aid in test facility inspections?

    • Test cell run procedures.

    • Unit serial number listings.

    • Periodic inspection checklists.

    • Monthly requirements listings.

    Correct Answer
    A. Periodic inspection checklists.
    Explanation
    Periodic inspection checklists are used as an aid in test facility inspections. These checklists provide a systematic and comprehensive approach to inspecting the test facility, ensuring that all necessary areas and equipment are inspected. They help to ensure that inspections are conducted consistently and efficiently, and that all required inspections are completed. By using periodic inspection checklists, test facility inspectors can identify any potential issues or deficiencies and take appropriate corrective actions.

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  • 49. 

    (806) The oil pressure indicator receives an electrical signal from the

    • Gyro

    • Transmitter.

    • Hydraulic unit.

    • Synchronous unit.

    Correct Answer
    A. Transmitter.
    Explanation
    The oil pressure indicator receives an electrical signal from the transmitter. This means that the transmitter is responsible for sending information about the oil pressure to the indicator. The other options, gyro, hydraulic unit, and synchronous unit, do not make sense in the context of an oil pressure indicator. A gyro is typically used for measuring rotation, a hydraulic unit is used for transmitting power through fluids, and a synchronous unit is used for maintaining constant speed. Therefore, the correct answer is transmitter.

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Quiz Review Timeline (Updated): Dec 14, 2023 +

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  • Current Version
  • Dec 14, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Jan 24, 2013
    Quiz Created by
    Kc10

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