2A651 Volume 5 Aircraft Troubleshooting

Reviewed by Editorial Team
The ProProfs editorial team is comprised of experienced subject matter experts. They've collectively created over 10,000 quizzes and lessons, serving over 100 million users. Our team includes in-house content moderators and subject matter experts, as well as a global network of rigorously trained contributors. All adhere to our comprehensive editorial guidelines, ensuring the delivery of high-quality content.
Learn about Our Editorial Process
| By Billingsnutz
B
Billingsnutz
Community Contributor
Quizzes Created: 1 | Total Attempts: 129
| Attempts: 129
SettingsSettings
Please wait...
  • 1/95 Questions

    To becmoe and 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
Please wait...
About This Quiz

This quiz assesses skills in aircraft engine troubleshooting, focusing on practical scenarios and technical order guidance. It targets understanding gauge indications, prioritizing repairs, and utilizing engine monitoring systems. Essential for learners aiming to excel in aircraft maintenance.

2A651 Volume 5 Aircraft Troubleshooting - Quiz

Quiz Preview

  • 2. 

    Responsibilty 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 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 the necessary preventive maintenance tasks are carried out. This could include tasks such as regular inspections, cleaning, and servicing of equipment to prevent any potential issues or breakdowns. It is important for these individuals to be diligent and proactive in carrying out their responsibilities to ensure the smooth functioning and longevity of the test cell facility.

    Rate this question:

  • 3. 

    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 information, which is presented in the form of troubleshooting charts. These charts provide a systematic approach to identifying and resolving problems or malfunctions in the power plant and engine systems. By following the steps outlined in the troubleshooting charts, maintenance personnel can effectively diagnose and rectify issues, ensuring the proper functioning of the aircraft's power plant and engine.

    Rate this question:

  • 4. 

    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 if 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, examining the unit that requires the least amount of time to replace would be the first step. This is because replacing the unit that requires less time can help identify if it was the main cause of the trouble. By examining and potentially replacing this unit first, it can help narrow down the issue and potentially solve the problem without having to go through the more time-consuming process of replacing all suspected units or repairing the more complex unit on the spot.

    Rate this question:

  • 5. 

    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 engine monitoring system (EMS) is used on most modern jet engines to gather and record engine data. This system is responsible for monitoring various parameters such as temperature, pressure, fuel flow, and vibration levels. It provides real-time data to the pilots and maintenance crew, allowing them to monitor the engine's performance and detect any abnormalities or potential issues. The recorded data can also be analyzed later for maintenance purposes and to improve engine efficiency and reliability.

    Rate this question:

  • 6. 

    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 prevents any errors or discrepancies. By checking the numbers on the engine data plate, you can be confident that you are accurately documenting the engine model and serial number in the log sheet.

    Rate this question:

  • 7. 

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

    • Resistor

    • Turbine inlet

    • Control valve

    • Exhaust duct

    Correct Answer
    A. Resistor
    Explanation
    The given answer, "resistor," is correct because a typical jet engine exhaust gas temperature (EGT) indicating system includes thermocouples, leads, and an indicator, as well as a resistor. The resistor is an essential component in the system as it helps to regulate the electrical current and provide accurate temperature readings. It works in conjunction with the thermocouples to measure the temperature of the exhaust gas and transmit the data to the indicator for display.

    Rate this question:

  • 8. 

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

    • Velocity

    • Phase log

    • Displacement accelorometer

    • Piezolectric accelorometer

    Correct Answer
    A. Piezolectric accelorometer
    Explanation
    A piezoelectric accelerometer is made up of certain ceramic compounds and natural crystals. These materials have the property of producing an electric charge when subjected to mechanical stress or vibration. This charge is then converted into a voltage signal, which can be measured and used to determine the magnitude and frequency of the vibration. Therefore, a piezoelectric accelerometer is the correct type of vibration transducer that is made up of these specific materials.

    Rate this question:

  • 9. 

    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 +/- 45 degrees

    • At a 90 degree angle to the engine exhaust

    • Directly into the exhaust, within +/- 45 degrees

    Correct Answer
    A. Directly into the inlet, within +/- 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 +/- 45 degrees. This is because the inlet is where the engine draws in air for combustion. By positioning the aircraft in this way, the engine can receive a steady flow of air, which is crucial for proper functioning and optimal performance.

    Rate this question:

  • 10. 

    If there's a problem in the F100-PW-220 aircraft engine, the digital electronic engine control (DEEC)

    • Trips and engine no-go flag

    • Turns on cokcpit lights to warn the pilot

    • Trips and engine monitoring unit (EMS) maintenance flag

    • Accommodates the fault and sends the fault code to the engine diagnostic unit (EDU)

    Correct Answer
    A. Accommodates the fault and sends the fault code to the engine diagnostic unit (EDU)
    Explanation
    In the event of a problem in the F100-PW-220 aircraft engine, the digital electronic engine control (DEEC) accommodates the fault and sends the fault code to the engine diagnostic unit (EDU). This means that the DEEC is designed to handle faults within the engine and communicates the specific fault code to the EDU for further analysis and diagnosis. This allows maintenance personnel to identify the exact issue and take appropriate action to resolve it. It does not involve tripping the engine no-go flag, turning on cockpit lights, or tripping the engine monitoring unit (EMS) maintenance flag.

    Rate this question:

  • 11. 

    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 a type of vibration that occurs intermittently and does not persist continuously. It comes and goes, usually in response to certain conditions or events. This type of vibration is often caused by temporary disturbances or variations in the engine's operation or environment. It is different from forced vibration, which is caused by a steady external force, and resonance, which is a sustained vibration at a specific frequency. Transient engine vibration is not externally excited, as it originates from within the engine itself.

    Rate this question:

  • 12. 

    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 channel indicator light emitting diode (LED). This means that the LED light on the analyzer will start flashing to indicate that the signal has surpassed the predetermined threshold. This visual cue is used to alert the user that the vibration levels have exceeded the acceptable range.

    Rate this question:

  • 13. 

    Which inspection is conducted by maintenance personnel after and occurrence of a specific or unusual condition?

    • Special

    • Calender

    • Acceptance

    • Time replacement item

    Correct Answer
    A. Special
    Explanation
    The correct answer is "special". After the occurrence of a specific or unusual condition, maintenance personnel conduct a special inspection. This inspection is different from routine inspections and is specifically focused on identifying and addressing the specific or unusual condition that occurred.

    Rate this question:

  • 14. 

    Which component in the 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)

    • Match number (Mn) test system

    • Supervisory control system (SCS)

    Correct Answer
    A. Data collection unit (DCU)
    Explanation
    The Data collection unit (DCU) is the component in the F100-PW-220 engine monitoring system that transfers information from the engine diagnostic unit (EDU) to the ground station unit (GSU). This unit is responsible for collecting and organizing data from various sensors and diagnostic systems within the engine, and then transmitting that information to the GSU for further analysis and monitoring. The DCU acts as a bridge between the EDU and the GSU, ensuring that important engine performance data is transferred accurately and efficiently.

    Rate this question:

  • 15. 

    Most engine monitoring guages 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. The transmitter is responsible for converting the physical measurements, such as temperature or pressure, into electrical signals. These signals are then sent to the indicator, which displays the readings in a format that can be easily interpreted by the operator. The transmitter and indicator work together to provide accurate and real-time information about the engine's performance, allowing for effective monitoring and troubleshooting.

    Rate this question:

  • 16. 

    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 die to shutdown

    • Eliminate items that could cause inaccurate readings

    Correct Answer
    A. Eliminate items that could possibly cause foreign object damage (FOD)
    Explanation
    Prior to an engine test cell run, it is important to check the engine and quick engine change (QEC) kit for loose nuts, bolts, lock wire, tools, or any other material in order to eliminate items that could potentially cause foreign object damage (FOD). FOD can be harmful to the engine and surrounding equipment, and can lead to costly repairs or failures. By ensuring that there are no loose items or debris present, the risk of FOD is minimized, promoting safe and efficient engine operation.

    Rate this question:

  • 17. 

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

    • Examine most complex unit.

    • Observe guage indications.

    • Check each part of every system

    • Discuss problem with other journeyman in the shop.

    Correct Answer
    A. Observe guage indications.
    Explanation
    To begin troubleshooting after reviewing the aircraft/engine forms, one should observe gauge indications. Gauge indications provide valuable information about the performance and condition of various systems in the aircraft/engine. By carefully observing gauge indications, any anomalies or discrepancies can be identified, which can then be further investigated to pinpoint the root cause of the problem. This approach allows for a systematic and focused troubleshooting process, starting with the most visible and measurable indicators of system performance.

    Rate this question:

  • 18. 

    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 test cell

    • The meanings of the intrument readings

    • What tools are required for maintenance

    Correct Answer
    A. The meanings of the intrument readings
    Explanation
    An understanding of the operating principles of engine instruments is important in order to interpret the readings provided by these instruments. By knowing the meanings of the instrument readings, one can determine the current status and performance of the engine. This knowledge is crucial in making decisions such as whether an engine should be removed from an aircraft or sent to a test cell for further examination. Additionally, understanding instrument readings helps in identifying any maintenance or repair requirements and determining the necessary tools and procedures for maintenance.

    Rate this question:

  • 19. 

    During vibration analysis, amplitude is measured in mils. One mil is equal to

    • 1.000 inch

    • 0.100 inch

    • 0.010 inch

    • 0.001 inch

    Correct Answer
    A. 0.001 inch
    Explanation
    During vibration analysis, amplitude is measured in mils. One mil is equal to 0.001 inch. This means that when measuring the amplitude of vibration, each mil represents a distance of 0.001 inch. Therefore, if the amplitude is measured as 5 mils, it would mean that the vibration is occurring with a displacement of 0.005 inch.

    Rate this question:

  • 20. 

    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 devices that reduce friction between moving parts, allowing them to rotate smoothly. In this case, bearings are used to support the fan and low-pressure turbine, ensuring that they can rotate efficiently and without excessive friction. Bushings, brackets, and blades are not specifically designed for supporting rotating parts like fans and turbines, making them incorrect options.

    Rate this question:

  • 21. 

    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 refers to the operational 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 that the JFS is functioning properly and can start the engine without the need for additional fuel or throttle adjustments.

    Rate this question:

  • 22. 

    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. Water is an effective cooling agent that helps to reduce the temperature of the exhaust gases, preventing overheating and potential damage to the equipment. This cooling process is necessary to maintain the efficiency and performance of the test cell noise suppressors, whether they are fixed in a specific location or portable for use in different settings.

    Rate this question:

  • 23. 

    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 FOD because FOD (Foreign Object Damage) refers specifically to damage caused by foreign objects entering and damaging an aircraft or its components. Ingestion of bolts, rocks, or formation of ice are all examples of foreign objects that can cause FOD. However, failure of internal parts is an internal issue and not related to foreign objects entering the system.

    Rate this question:

  • 24. 

    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

    • Damaged aft bearing oil seal

    • An underserviced oil system

    • Leaking external oil lines

    • A loose aft roller bearing

    Correct Answer
    A. Damaged aft bearing oil seal
    Explanation
    If oil is observed on the turbine wheel or oil smoke is present at or near the turbine section during a test cell run, it is a good indication that the aft bearing oil seal is damaged. The oil seal is responsible for preventing oil leakage from the bearing housing, and when it is damaged, oil can escape and come into contact with the turbine wheel, causing the observed symptoms. This suggests that there is a problem with the aft bearing oil seal, which needs to be addressed to prevent further damage and ensure proper functioning of the system.

    Rate this question:

  • 25. 

    If an engine stalls or surges during a test cell rum, 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 responsible for adjusting the airflow in the engine, and any malfunction or issue with them can cause disruptions in the engine's performance. Therefore, it is necessary to examine the variable stator vanes to identify and address any problems that may be causing the engine to stall or surge.

    Rate this question:

  • 26. 

    Which characteristics 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 because lubrication is essential for reducing friction and preventing wear between the bearing surfaces. Without proper lubrication, the bearing will experience increased friction, heat, and wear, leading to premature failure. Additionally, lubrication helps to remove contaminants and debris from the bearing, further protecting it from damage. Therefore, when there is a complete loss of lubrication, the bearing is left vulnerable to excessive friction, heat, and wear, ultimately resulting in failure.

    Rate this question:

  • 27. 

    To be considered effective tools for avaiators, 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
    To be considered effective tools for aviators, aircraft instruments must be small in size. This is because in the limited space of an aircraft cockpit, there is a need for compact instruments that do not take up too much space. Additionally, smaller instruments are easier to install and arrange in the cockpit, allowing for better visibility and accessibility for the pilot. Therefore, small size is an important characteristic for aircraft instruments to ensure their effectiveness in aviation operations.

    Rate this question:

  • 28. 

    In addition to determining the condition of a repaired or everhauled 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 damage

    Correct Answer
    A. That have been involved in an incident or a mishap
    Explanation
    The correct answer is "that have been involved in an incident or a mishap." This means that in addition to testing engines that have been repaired or overhauled, engines that have been involved in an accident or incident are also tested. This is important to ensure that the engine is still functioning properly and to identify any potential issues or damage that may have occurred as a result of the incident.

    Rate this question:

  • 29. 

    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 a model 4100 trailer

    Correct Answer
    A. From a cradle mount
    Explanation
    Engines are mounted from a cradle mount, which means they are supported and held in place by a secure framework. This type of mounting allows for stability and easy access to the engine for testing purposes. The cradle mount ensures that the engine is securely attached and can withstand the forces exerted during testing. This method of mounting is commonly used in fixed test cells to ensure accurate and reliable testing of engines.

    Rate this question:

  • 30. 

    Which engine area should be checked for 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 FOD (Foreign Object Debris) prior to operation on the test cell facility. This is because the turbine area is a critical part of the engine where the combustion process occurs, and any foreign objects present in this area can cause damage to the turbine blades and disrupt the engine's performance. Therefore, it is important to inspect and remove any debris from the turbine area before operating the engine in the test cell facility.

    Rate this question:

  • 31. 

    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, the vehicle's engine is allowed to naturally slow down and come to a stop. This step is important because it allows any potential leaks in the test cell to become more noticeable. As the engine cools down and the pressure inside the test cell decreases, any leaks present will become more apparent. Therefore, the final check for leaks is accomplished during engine coast down.

    Rate this question:

  • 32. 

    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 standardized set of criteria and guidelines for inspectors to follow during inspections. They ensure that all necessary areas and equipment are thoroughly examined and evaluated. By using these checklists, inspectors can easily identify any potential issues or discrepancies that may exist in the test facility. This helps to maintain the quality and safety of the facility and ensures that it meets the required standards and regulations.

    Rate this question:

  • 33. 

    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 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, engine, and other crucial components. By performing a preflight inspection, pilots can identify any potential issues or malfunctions that could jeopardize the safety of the flight. Therefore, the correct answer to this question is preflight.

    Rate this question:

  • 34. 

    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 the information about the oil pressure to the indicator. The transmitter is likely connected to the oil system and measures the pressure, converting it into an electrical signal that can be interpreted by the indicator. Without the transmitter, the oil pressure indicator would not receive any information and would not be able to display the oil pressure accurately.

    Rate this question:

  • 35. 

    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 an operational check of the fire warning system ensures that the system is functioning properly. This switch is specifically designed to initiate a test of the fire warning system, allowing the operator to verify that the system is capable of detecting and alerting for potential fires. By pressing only the TEST switch, the operator can isolate the test function and ensure that the system is not inadvertently switched to a different mode or setting. Pressing any other switches could potentially interfere with the accuracy of the test or compromise the system's functionality.

    Rate this question:

  • 36. 

    The vibration pickups on the portable test cell are colled by the

    • Engine oil

    • Atmosphere

    • Hydraulic fluid

    • Pneumatic system

    Correct Answer
    A. Pneumatic system
    Explanation
    The vibration pickups on the portable test cell are cooled by the pneumatic system. This means that the pneumatic system is responsible for cooling the vibration pickups.

    Rate this question:

  • 37. 

    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. Thermocouples are temperature sensors that work based on the principle of the Seebeck effect, which generates a voltage when there is a temperature difference between two different metals. Alumel and chromel are specific alloys that are commonly used in type K thermocouples, which are suitable for measuring high temperatures, such as those found in exhaust gas systems. Therefore, alumel and chromel are the correct metals used in the EGT indicating system.

    Rate this question:

  • 38. 

    On engines with afterburners, the position of the exhaust nozzle is converted into an electrical signal by a

    • Rheostat

    • Recitifier

    • Transducer

    • Transformer

    Correct Answer
    A. Transducer
    Explanation
    A transducer is a device that converts one form of energy into another. In the case of engines with afterburners, the position of the exhaust nozzle needs to be converted into an electrical signal. A transducer is capable of converting the mechanical motion of the nozzle into an electrical signal, allowing it to be measured and controlled. This makes transducer the most suitable option among the given choices.

    Rate this question:

  • 39. 

    How often are service inspections conducted on test cell?

    • Daily

    • Hourly

    • Weekly

    • Monthly

    Correct Answer
    A. Daily
    Explanation
    Service inspections on test cell are conducted daily. This frequency ensures that the test cell is regularly checked for any issues or malfunctions that may affect its performance. Daily inspections help in identifying and addressing any potential problems promptly, ensuring the smooth functioning of the test cell and accurate test results. It also allows for regular maintenance and upkeep of the equipment, minimizing the risk of breakdowns or failures during testing operations.

    Rate this question:

  • 40. 

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

    • Restricted air inlet

    • Rapid throttle movement

    • A restricted turbine nozzle

    • Malfuctioning 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 careless movement of the throttle can disrupt the airflow and create turbulence within the compressor. This turbulence can disrupt the proper functioning of the compressor, leading to a stall. It is important to operate the throttle carefully and smoothly to avoid such issues.

    Rate this question:

  • 41. 

    The filter selector switch on the vibration analyzer is used to

    • Provide an exact 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 select the necessary filter. This is important because different filters are used to analyze different frequencies of vibration. By selecting the appropriate filter, the user can focus on specific frequency ranges and eliminate unwanted noise or interference, thereby obtaining accurate and reliable vibration analysis results.

    Rate this question:

  • 42. 

    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 should the physical condition of the aircraft be checked, but also any required documentation or paperwork related to the aircraft should be reviewed. This ensures that the aircraft is in proper working order and all necessary paperwork is in order before it is moved into the hush house.

    Rate this question:

  • 43. 

    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 self-contained unit used for testing various equipment or systems. It is designed to be easily transported and set up in different locations. The control cab is the area where the operator controls and monitors the test processes. The thrust trailer is used to measure and analyze the thrust produced by the equipment being tested. The miscellaneous equipment kit contains various tools and accessories necessary for conducting the tests. The hydraulically operated pylon mount cradle is a mechanism used to securely mount and position the equipment being tested. Since the portable test cell is not equipped with a hydraulically operated pylon mount cradle, it means that the equipment being tested is not mounted and positioned using this specific mechanism.

    Rate this question:

  • 44. 

    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 refers to the area where the air and fuel mix and ignite, and it is not necessary to measure the temperature at this point.

    Rate this question:

  • 45. 

    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 oil pressure transmitter and indicator are two units that work together to indicate the oil system is operating correctly. The transmitter measures the oil pressure and sends a signal to the indicator, which displays the pressure reading. This allows the operator to monitor the oil pressure and ensure it is within the desired range.

    Rate this question:

  • 46. 

    The frequency of the tachometer generator 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 rotational speed of an engine. It generates an electrical signal whose frequency is directly proportional to the engine speed. As the engine speed increases, the frequency of the generated signal also increases. Therefore, the correct answer is "engine speed".

    Rate this question:

  • 47. 

    When properly adjusted, the accuracy of the test cell N1 and N2 speed indicator in revolutions per mimnute (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 indicated speed on the test cell will be within 2 RPM of the actual speed.

    Rate this question:

  • 48. 

    The test cell integrated circuit (IC) temperature indicator displays temperatures in degress Fahrenheit, with a range of

    • -100 to +1,000

    • -75 to +1,400

    • -50 to +1,600

    • -25 to +1,800

    Correct Answer
    A. -50 to +1,600
    Explanation
    The correct answer is -50 to +1,600. This range is the widest among the given options and covers a larger span of temperatures. It allows for a more comprehensive display of temperatures, ranging from very low temperatures (-50 degrees Fahrenheit) to high temperatures (+1,600 degrees Fahrenheit). This range is suitable for a test cell integrated circuit temperature indicator as it can accommodate a wide range of temperature variations that may be encountered in different testing scenarios.

    Rate this question:

  • 49. 

    During vibration analysis, frequency is usually measured in

    • Mils

    • Phase lags

    • Cycles per second

    • Phases per second

    Correct Answer
    A. Cycles per second
    Explanation
    During vibration analysis, frequency is usually measured in cycles per second. This is because frequency represents the number of complete cycles or oscillations that occur in one second. It is a fundamental parameter used to analyze vibrations and is commonly expressed in cycles per second, also known as Hertz (Hz). This measurement helps in identifying the rate or speed at which the vibration is occurring, allowing for further analysis and understanding of the vibration behavior.

    Rate this question:

Quiz Review Timeline (Updated): Jan 20, 2025 +

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

  • Current Version
  • Jan 20, 2025
    Quiz Edited by
    ProProfs Editorial Team
  • Dec 10, 2012
    Quiz Created by
    Billingsnutz

Recent Quizzes

Volume 4 - 2014 2A651S CDC Volume 4 - 2014 2A651S CDC
2a651 edition2 volume 5 2a651 edition2 volume 5
2a651 volume 5 ure's 2a651 volume 5 ure's
Back to Top Back to top
Advertisement
×

Wait!
Here's an interesting quiz for you.

We have other quizzes matching your interest.