2A651 Volume 5 Ure's

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  • 1/95 Questions

    A/C power plant and engine intermediate maintenance TO contain information on troubleshooting. this info is presented in the form of?

    • Troubleshooting charts
    • Mechanical drawings
    • Power plant charts
    • Fix-it diagrams
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2A651 Volume 5 Ure
About This Quiz

This quiz titled '2a651 volume 5 ure's' assesses knowledge in aircraft engine troubleshooting. It focuses on practical approaches to diagnosing issues, understanding system functions, and using engine monitoring tools. Ideal for enhancing skills in aircraft maintenance and engine diagnostics.

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  • 2. 

    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
    Engine monitoring gauges and instruments require a transmitter and indicator to function properly. The transmitter is responsible for converting the physical parameter being measured (such as temperature or pressure) into an electrical signal. This electrical signal is then sent to the indicator, which displays the information to the user. Without both the transmitter and indicator, the gauges and instruments would not be able to accurately measure and display the engine's parameters.

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  • 3. 

    Which metals are used in the thermocouples of the exhaust gas temperature 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 indicating system. Thermocouples are temperature sensors that work based on the principle of the Seebeck effect, which generates a voltage when two dissimilar metals are joined together. Alumel and chromel are two types of alloys that are commonly used in thermocouples due to their high temperature resistance and stability. Alumel is composed of nickel, aluminum, manganese, and silicon, while chromel is made of nickel and chromium. These alloys are chosen for their ability to withstand the high temperatures and harsh conditions of the exhaust gas environment.

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  • 4. 

    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, wire, tools, or any other material in order to help?

    • Eliminate items that could possibly cause FOD

    • Assure that the instrumentation is working properly

    • Prevent wasted mx. hours due to shutdown

    • Eliminate that could cause inaccurate readings

    Correct Answer
    A. Eliminate items that could possibly cause FOD
    Explanation
    Prior to an engine test cell run, checking the engine and quick engine change (QEC) kit for loose nuts, bolts, wire, tools, or any other material helps eliminate items that could potentially cause Foreign Object Damage (FOD). FOD can be any object or debris that could be ingested by the engine during operation, leading to damage or malfunction. By ensuring that there are no loose items present, the risk of FOD-related issues can be minimized, promoting safety and preventing damage to the engine.

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  • 5. 

    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 knowledge allows troubleshooters to identify and diagnose problems accurately. Without understanding the function of each unit, it would be difficult to effectively troubleshoot and resolve issues. While being a 7-level, having at least 5 years of experience, and attending college courses in troubleshooting techniques may contribute to expertise, understanding the function of each unit within each system is the most essential requirement.

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  • 6. 

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

    • Engine start system

    • Engine monitoring system

    • Supervisory control system

    • Supervisory monitoring system

    Correct Answer
    A. Engine monitoring system
    Explanation
    The engine monitoring system is used on most modern jet engines to gather and record engine data. This system allows for real-time monitoring of various parameters such as temperature, pressure, fuel flow, and vibration levels. It helps in identifying any potential issues or abnormalities in the engine's performance and can provide valuable data for maintenance and troubleshooting purposes.

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  • 7. 

    Which one of these inspections is a flight preparedness ck?

    • Periodic

    • Preflight

    • Thruflight

    • EOR

    Correct Answer
    A. Preflight
    Explanation
    The preflight inspection is a flight preparedness check that is conducted before every flight. It involves a thorough examination of the aircraft to ensure that it is in proper working condition and ready for flight. This inspection includes checking the fuel levels, control surfaces, landing gear, and other essential components. By performing a preflight inspection, pilots can identify any potential issues or malfunctions that could affect the safety and performance of the aircraft during the flight.

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  • 8. 

    Which inspection is conducted by mx. personnel after an occurrence of a specific or unusal conditon?

    • Special

    • Calender

    • Acceptance

    • Time replacement item

    Correct Answer
    A. Special
    Explanation
    After an occurrence of a specific or unusual condition, a special inspection is conducted by MX personnel. This inspection is different from routine inspections as it focuses on investigating and assessing the specific condition that occurred. It aims to identify any potential issues, determine the cause of the condition, and implement necessary corrective actions. The special inspection helps ensure that any unusual or specific conditions are thoroughly examined and addressed to maintain safety and operational efficiency.

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  • 9. 

    The engine fuel-flow indicating system of most jet powered a/c contains a fuel-flow

    • A 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 correct answer is "transmitter and a fuel-flow indicator." In the engine fuel-flow indicating system of most jet powered aircraft, a transmitter is used to measure the fuel flow and send this information to a fuel-flow indicator. This allows the pilot or operator to monitor the fuel consumption and ensure that the engine is receiving an adequate supply of fuel. The float valve and control valve options are not correct as they are not typically part of the fuel-flow indicating system.

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  • 10. 

    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 flanges 2 (2)

    • Temperature (t) and pressure (p) at flange 2 (2)

    Correct Answer
    A. Total (T) pressure (P) at station 2 (2)
    Explanation
    The term Pt2 refers to the total pressure (T) at station 2 (2), not at flange 2.

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  • 11. 

    After running an engine in augmentation in the hush house, the augmentor tube is cooled by running the engine at idle for a period of?

    • 1 min.

    • 3 min.

    • 6 min.

    • 9 min.

    Correct Answer
    A. 3 min.
    Explanation
    After running an engine in augmentation in the hush house, the augmentor tube is cooled by running the engine at idle for a period of 3 minutes. This cooling process is necessary to prevent overheating and damage to the augmentor tube. Running the engine at idle allows for a gradual decrease in temperature and ensures that the tube is adequately cooled before shutting down the engine completely. A shorter cooling period may not be sufficient to cool down the augmentor tube, while a longer period may be unnecessary and inefficient.

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  • 12. 

    Which of these is not considered a cause of FOD?

    • Ingestion of bolts

    • Formation of ice

    • Ingestion of rocks

    • Failure of internal parts

    Correct Answer
    A. Failure of internal parts
    Explanation
    Failure of internal parts is not considered a cause of Foreign Object Damage (FOD) because FOD refers specifically to damage caused by foreign objects, such as debris, tools, or wildlife, entering and damaging aircraft engines, systems, or structures. Failure of internal parts, on the other hand, refers to mechanical or structural failures within the aircraft itself, which can result in damage but are not classified as FOD. FOD prevention focuses on reducing the risk of foreign objects entering the aircraft and causing damage.

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  • 13. 

    How often are service insp. conducted on the test cell?

    • Daily

    • Hourly

    • Weekly

    • Monthly

    Correct Answer
    A. Daily
    Explanation
    Service inspections are conducted on the test cell daily. This suggests that the test cell requires regular maintenance and checks to ensure its proper functioning. Conducting service inspections on a daily basis allows for any issues or malfunctions to be identified and addressed promptly, minimizing downtime and optimizing the performance of the test cell. Regular daily inspections also help to maintain the accuracy and reliability of the test results obtained from the test cell.

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  • 14. 

    Which component in the PW-220 engine monitoring system transfer info from the EDU to the ground station unit?

    • Data collection unit

    • Engine analyzer unit

    • Mach number (mn) test system

    • Supervisory control system

    Correct Answer
    A. Data collection unit
    Explanation
    The data collection unit in the PW-220 engine monitoring system is responsible for transferring information from the EDU (Engine Data Unit) to the ground station unit. This component collects data from the EDU, which includes various parameters such as engine performance, fuel consumption, and temperature readings. It then sends this data to the ground station unit for further analysis and monitoring.

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  • 15. 

    An understanding of the operating principles of engine instruments will help you decide?

    • If an engine should be removed form an a/c

    • If the engine should be sent to the test cell

    • The meanings of the instruments readings

    • What tools are required for maintenance

    Correct Answer
    A. The meanings of the instruments readings
    Explanation
    An understanding of the operating principles of engine instruments will help you decide the meanings of the instruments readings. By knowing how the engine instruments work and what each reading indicates, you can interpret the information provided by the instruments accurately. This knowledge is crucial in determining the health and performance of the engine, which in turn helps in making decisions such as whether the engine should be removed from the aircraft or sent to the test cell for further evaluation.

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  • 16. 

    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 tachometer indicator. The tachometer generator is responsible for generating the electrical signals based on the rotational speed of the engine. These electrical signals are then sent to the tachometer indicator, which displays the rotational speed in the form of a visual indicator. Therefore, the correct answer is "indicator" as it is one of the two primary units of the tachometer indicating system.

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  • 17. 

    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. Typing these items, checking past records, or entering them only after the test is complete may not guarantee accuracy, as these methods do not involve directly verifying the numbers on the engine data plate.

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  • 18. 

    Responsibility for the proper preventive mx. of a test cell facility rests with the?

    • Individuals assigned

    • Civil engineer squadron

    • Equipment mx. squadron

    • AGE flight

    Correct Answer
    A. Individuals assigned
    Explanation
    The responsibility for the proper preventive maintenance of a test cell facility rests with the individuals assigned to the task. This means that it is the responsibility of the specific individuals who have been assigned to the maintenance of the test cell facility to ensure that it is properly taken care of and preventive measures are implemented. This could include regular inspections, repairs, and maintenance tasks to ensure the facility is functioning optimally and any potential issues are addressed before they become major problems.

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  • 19. 

    Which f-16 ops check allows you to start the 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 an F-16 ops check that allows you to start the Jet Fuel Starter (JFS) without advancing the throttle to idle or supplying fuel to the aircraft engine. This check is performed to ensure the proper functioning of the JFS and its ability to start the engine without the need for fuel. It is an important step in the startup procedure of the F-16 aircraft.

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  • 20. 

    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, one should investigate the variable stator vanes. Variable stator vanes are used in turbine engines to control airflow and optimize engine performance. If these vanes are not functioning properly, it can cause disruptions in the airflow, leading to stalling or surging of the engine. Therefore, investigating the variable stator vanes would be necessary to identify and rectify the issue.

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  • 21. 

    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 could cause a compressor stall during emergency system operation. This is because sudden and aggressive movement of the throttle can disrupt the delicate balance of air and fuel mixture in the compressor, leading to an imbalance in the combustion process. This imbalance can result in a compressor stall, where the airflow through the compressor is disrupted, causing a loss of power and potentially damaging the engine.

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  • 22. 

    After reviewing the a/c & 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 and engine forms, it is suggested to observe gauge indications. This means that by closely monitoring the readings on the gauges, one can identify any abnormal or out-of-range values that may indicate a problem within the system. This approach allows for a more targeted investigation and can help in narrowing down the potential causes of the issue. By focusing on the gauge indications, the troubleshooter can gather important information about the system's performance and make informed decisions on further steps to take.

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  • 23. 

    To be considered effective tools for aviators, a/c 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
    In order for aircraft instruments to be considered effective tools for aviators, they need to meet certain criteria. One of these criteria is being small in size. This is important because aircraft cockpits have limited space, and having small instruments allows for more efficient use of that space. Additionally, smaller instruments are easier to install and navigate around in the cockpit. Therefore, small size is an important factor for aircraft instruments to be effective tools for aviators.

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  • 24. 

    The frequency of the tachometer generator is proportional to the?

    • Engine speed

    • Transformer speed

    • Speed of the electical magnet

    • Speed of the alternating magnet

    Correct Answer
    A. Engine speed
    Explanation
    The tachometer generator is a device used to measure the speed of an engine. It works by generating a frequency that is proportional to the engine speed. Therefore, the correct answer is "engine speed" because the frequency of the tachometer generator is directly related to the speed of the engine.

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  • 25. 

    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. When the accelerometer experiences vibrations, the crystals within it generate an electric charge, which is then measured and converted into a corresponding acceleration value. This type of transducer is commonly used for measuring vibrations in various applications such as structural analysis, machine monitoring, and automotive testing.

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  • 26. 

    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 and load of rotating equipment. In this case, the fan and low-pressure turbine require support to ensure smooth rotation and minimize wear and tear. Bearings provide this support by allowing the rotating parts to move freely while reducing friction and preventing excessive heat buildup. Therefore, bearings are essential components in supporting the fan and low-pressure turbine.

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  • 27. 

    When operating an engine that is installed on a/c, position the a/c so the wind is blowing?

    • At an unnoticeable level

    • Directly into the inlet, within plus or minus 45 degrees

    • At a 90 degrees angle to the engine exhaust

    • Directly into the exhaust, within plus or minus 45 degrees

    Correct Answer
    A. Directly into the inlet, within plus or minus 45 degrees
    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 plus or minus 45 degrees. This is because the wind blowing directly into the inlet helps to provide the necessary airflow for the engine's combustion process. Positioning the aircraft in this way ensures that the engine receives the optimal amount of air for efficient operation.

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  • 28. 

    Which testing engine is equipped with a QEC kit?

    • TF39-1c

    • F110-ge-129

    • F100-pw-220

    • F100-pw-229

    Correct Answer
    A. TF39-1c
  • 29. 

    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. Fatigue failure in turbine blades is typically caused by repeated stress cycles, which can be caused by factors such as nicks, dents, and scratches. However, blends, which refer to smooth transitions between different surfaces, do not introduce stress concentrations or irregularities that could lead to fatigue failure. Therefore, blends are not a likely cause of turbine blade fatigue failure.

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  • 30. 

    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 and do not persist continuously. These vibrations come and go, often caused by temporary disturbances or changes in engine conditions. Unlike forced vibrations, which are continuous and caused by a constant external force, transient vibrations are more unpredictable and can vary in intensity and duration. Resonance vibrations, on the other hand, occur when the engine's natural frequency matches an external force frequency, leading to sustained vibrations. Therefore, the correct answer is transient.

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  • 31. 

    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, the device will notify you when a preset signal has been exceeded by flashing a channel indicator light emitting diode (LED). This indicates that the vibration levels have exceeded the predetermined threshold and serves as a visual alert to the user. The LED light is a practical and efficient way to quickly and easily identify when the vibration levels are outside the acceptable range.

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  • 32. 

    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
    The engines are mounted from a cradle mount. This means that they are suspended and supported by a cradle-like structure. This method of mounting allows for stability and flexibility in testing the engines, as they can be easily adjusted and maneuvered as needed. It also ensures that the engines are securely held in place during testing, minimizing any potential risks or accidents.

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  • 33. 

    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 conduct a test cell run, it is necessary to determine the specific engine's correct type and grade of oil used. This information can be found in the applicable engine publications. These publications provide detailed information about the engine, including the recommended oil specifications and requirements. By referring to the applicable engine publications, you can ensure that the correct type and grade of oil are used for the test cell run, which is crucial for the engine's optimal performance and reliability.

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  • 34. 

    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
    When encountering engine trouble where more than one unit is at fault, it is best to examine the unit that requires the least amount of time to replace. This approach allows for a quicker diagnosis and resolution of the issue, as it focuses on the unit that can be replaced most efficiently. By addressing the problem with the unit that can be replaced quickly, it may also help to narrow down the potential causes of the engine trouble and identify any additional units that need to be examined or replaced.

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  • 35. 

    If there's a problem in the PW-220 a/c engine, the  DEEC?

    • Trips an engine no-go flag

    • Turns on cockpit lights to warn the pilot

    • Trips an engine monitoring unit (EMS) maintenance flag

    • Accommodates the fault and sends fault code to the EDU

    Correct Answer
    A. Accommodates the fault and sends fault code to the EDU
    Explanation
    The correct answer is "accommodates the fault and sends fault code to the EDU". In the event of a problem in the PW-220 a/c engine, the DEEC (Digital Electronic Engine Control) system is designed to accommodate the fault and send a fault code to the EDU (Engine Data Unit). This allows for the identification and diagnosis of the specific issue, which can then be addressed by maintenance personnel. The DEEC does not trip an engine no-go flag, turn on cockpit lights, or trip an engine monitoring unit (EMS) maintenance flag.

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  • 36. 

    Before moving an a/c into the hush house, you must inspect the a/c?

    • Red streamers

    • And its forms

    • Flight station

    • Forms

    Correct Answer
    A. And its forms
    Explanation
    The correct answer is "and its forms". Before moving an aircraft into the hush house, it is necessary to inspect the aircraft and its various forms. This implies that not only the physical condition of the aircraft should be checked, but also any relevant documentation or paperwork associated with the aircraft should be reviewed. This comprehensive inspection ensures that all aspects of the aircraft are in proper order before it is moved into the hush house.

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  • 37. 

    Before operating an engine at the test cell, you must always check its status as indicated on the?

    • Crew chief's log book of mx. performed

    • Mx. log book

    • Engine forms

    • A/c forms

    Correct Answer
    A. Engine forms
    Explanation
    Before operating an engine at the test cell, it is important to check its status as indicated on the engine forms. These forms contain crucial information about the engine's maintenance history, any recent repairs or modifications, and any outstanding issues that need to be addressed. By reviewing the engine forms, the operator can ensure that the engine is in a suitable condition for testing and identify any potential risks or concerns that may affect its performance or safety.

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  • 38. 

    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 likely a good indication of a damaged aft bearing oil seal. The presence of oil or oil smoke suggests that there is a leak in the oil seal, which is causing the oil to escape and potentially come into contact with the turbine wheel or create smoke. This indicates that the oil seal is not functioning properly and needs to be repaired or replaced.

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  • 39. 

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

    • For training practices

    • In a/c that have been washed

    • That have been invovled in an incident or a mishap

    • That have severe FOD damage

    Correct Answer
    A. That have been invovled 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 their condition after repair or overhaul. This is because these engines may have undergone significant damage or stress during the incident or mishap, which could affect their performance and safety. Testing these engines helps to ensure that they are functioning properly and can be safely used again.

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  • 40. 

    A typical jet engine exhaust gas temperature 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 indicating system contains thermocouples, leads, an indicator, and a resistor. The resistor is used in the system to provide a reference point for the temperature measurements. It helps to calibrate the readings from the thermocouples and ensures accurate temperature measurements. Without the resistor, the system would not be able to accurately indicate the exhaust gas temperature.

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  • 41. 

    When properly adjusted, the accuracy of the test cell N1 and N2 speed indicator in revolutions per minute (RPM) will be within?

    • 1 rpm

    • 2 rpm

    • 3 rpm

    • 4 rpm

    Correct Answer
    A. 2 rpm
    Explanation
    The accuracy of the test cell N1 and N2 speed indicator in revolutions per minute (RPM) will be within 2 rpm when properly adjusted. This means that the readings on the speed indicator will be accurate within a range of plus or minus 2 rpm.

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  • 42. 

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

    • Near the bleed area

    • To the rear exhaust area

    • Against the a/c fuselage

    • Forward of the bleed exhaust area

    Correct Answer
    A. Against the a/c fuselage
    Explanation
    The primary silencers on an aircraft noise suppressor are positioned against the aircraft fuselage. This placement allows for effective noise reduction by minimizing the transmission of sound waves from the engine exhaust. By positioning the primary silencers against the fuselage, the noise is contained and absorbed, resulting in a quieter aircraft environment.

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  • 43. 

    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 is the step in a test cell leak check where a final check for leaks is accomplished. This step occurs after the engine has been started and is being shut down. As the engine coasts down, any leaks that may be present can be detected and addressed before the test is completed. This ensures that the test cell is properly sealed and that accurate results can be obtained during the testing process.

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  • 44. 

    What info is used as an aid in test facility insp.?

    • Test cell run procedures

    • Unit serial number listings

    • Periodic insp. checklists

    • Monthly requirements listings

    Correct Answer
    A. Periodic insp. checklists
    Explanation
    Periodic inspection checklists are used as an aid in test facility inspections. These checklists provide a systematic and standardized approach to conducting inspections, ensuring that all necessary areas and components are thoroughly examined. They outline specific inspection tasks, criteria, and requirements that need to be met, helping inspectors to identify any potential issues or deficiencies. By using periodic inspection checklists, test facility inspections can be conducted efficiently and effectively, ensuring the facility's compliance with safety and quality standards.

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  • 45. 

    A cold compressor stall that occurs at low revolutions per minute (rpm) and is accompanied by a slight over temperature is called?

    • An incipient

    • A thermal

    • A partial

    • A mild

    Correct Answer
    A. An incipient
    Explanation
    An incipient cold compressor stall refers to a stall that occurs at low rpm and is accompanied by a slight over temperature. This means that the compressor is experiencing a disruption in airflow, leading to a decrease in performance and an increase in temperature. The term "incipient" suggests that the stall is in its early stages and has not fully developed yet.

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  • 46. 

    Two units that work together to indicate the oil system is operating correctly are the oil pressure?

    • Relief valve and indicator

    • Transmitter and indicator

    • Relief valve and transmitter

    • Synchronous unit and indicator

    Correct Answer
    A. Transmitter and indicator
    Explanation
    The correct answer is transmitter and indicator. The oil pressure transmitter is responsible for measuring the oil pressure in the system and sending the information to the indicator. The indicator then displays the oil pressure reading to the operator, allowing them to monitor the system and ensure it is operating correctly. Both the transmitter and indicator are necessary for indicating the oil system's operation.

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  • 47. 

    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 tachometer indicator is an electric magnetic-drag type instrument. This means that it operates using an electric current and a magnetic field to measure and display the speed of rotation of an engine or motor. The magnetic drag in this type of instrument allows for accurate and precise readings of the rotational speed.

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  • 48. 

    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 correct answer is the thrust stand slides into position on tracks. This feature allows for flexibility when running an engine that has been removed from the airframe because the thrust stand can be easily adjusted and positioned on tracks to accommodate different engine sizes and configurations. This ensures stability and safety during engine testing and allows for efficient and precise measurements of thrust output.

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  • 49. 

    In the fixed test cell, air for the engine intake comes through baffles located on the?

    • Floor

    • Ceiling

    • Side walls

    • Front doors

    Correct Answer
    A. Ceiling
    Explanation
    In the fixed test cell, air for the engine intake comes through baffles located on the ceiling. This means that the air enters the test cell from the top, possibly through vents or openings in the ceiling. The baffles help control the flow and direction of the air, ensuring that it is distributed evenly throughout the test cell. This setup allows for efficient testing and analysis of the engine's performance.

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Quiz Review Timeline (Updated): Mar 21, 2023 +

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

  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Oct 22, 2012
    Quiz Created by
    Hamandcheese

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