2A651 Volume 5 Ure's

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| By Hamandcheese

Hamandcheese

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Quizzes Created: 5 | Total Attempts: 992

Questions: 95 | Attempts: 96 | Updated: Mar 21, 2023

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Volume 5 ure's

Questions and Answers

1.

After reviewing the a/c & engine forms, where should you begin troubleshooting?
- A.
  
  Examine most complex unit
- B.
  
  Observe gauge indications
- C.
  
  Check each part of every system
- D.
  
  Discuss problem with other journeymen in the shop
Correct Answer
B. 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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2.

If you encounter engine trouble where more than one unit is at fault, you would first?
- A.
  
  Go back and check engine forms again
- B.
  
  Replace all the units suspected to be at fault
- C.
  
  Try to repair the more complex unit on the spot
- D.
  
  Examine the unit that requires the least amount of time to replace
Correct Answer
D. 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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3.

A/C power plant and engine intermediate maintenance TO contain information on troubleshooting. this info is presented in the form of?
- A.
  
  Troubleshooting charts
- B.
  
  Mechanical drawings
- C.
  
  Power plant charts
- D.
  
  Fix-it diagrams
Correct Answer
A. Troubleshooting charts

Explanation
The correct answer is troubleshooting charts. In an A/C power plant and engine intermediate maintenance TO (Technical Order), troubleshooting information is presented in the form of troubleshooting charts. These charts provide a step-by-step guide to diagnose and solve common issues or problems that may arise during maintenance or operation of the power plant and engine. They help technicians identify the root cause of the problem and provide recommended solutions or actions to rectify the issue. By following the troubleshooting charts, technicians can efficiently troubleshoot and resolve any problems that may occur.

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4.

To become an expert troubleshooter, you must?
- A.
  
  Be a 7-level
- B.
  
  Have at least 5 years experience
- C.
  
  Attend college courses in troubleshooting techniques
- D.
  
  Understand the function of each unit within each system
Correct Answer
D. 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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5.

What system is used on most modern jet engines to gather and record engine data?
- A.
  
  Engine start system
- B.
  
  Engine monitoring system
- C.
  
  Supervisory control system
- D.
  
  Supervisory monitoring system
Correct Answer
B. 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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6.

The PW-220 engine monitoring system component that acquires fault data from the DEEC and logs the faults with the time of their occurence is the?
- A.
  
  Data collection unit
- B.
  
  Ground station unit
- C.
  
  Engine analyzer unit
- D.
  
  Engine diagnostic unit
Correct Answer
D. Engine diagnostic unit

Explanation
The engine diagnostic unit is the PW-220 engine monitoring system component that acquires fault data from the DEEC and logs the faults with the time of their occurrence. This unit is responsible for analyzing the engine's performance and identifying any faults or issues that may arise during operation. It collects data from the DEEC, which is the Digital Electronic Engine Control, and keeps a record of the faults along with their timestamps. This information is crucial for maintenance and troubleshooting purposes, allowing engineers to identify and address any problems with the engine.

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7.

Which component in the PW-220 engine monitoring system transfer info from the EDU to the ground station unit?
- A.
  
  Data collection unit
- B.
  
  Engine analyzer unit
- C.
  
  Mach number (mn) test system
- D.
  
  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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8.

If there's a problem in the PW-220 a/c engine, the DEEC?
- A.
  
  Trips an engine no-go flag
- B.
  
  Turns on cockpit lights to warn the pilot
- C.
  
  Trips an engine monitoring unit (EMS) maintenance flag
- D.
  
  Accommodates the fault and sends fault code to the EDU
Correct Answer
D. 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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9.

To be considered effective tools for aviators, a/c instruments must be light weight, easy to read, and
- A.
  
  Small in size
- B.
  
  Analog readout
- C.
  
  Digital readout
- D.
  
  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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10.

An understanding of the operating principles of engine instruments will help you decide?
- A.
  
  If an engine should be removed form an a/c
- B.
  
  If the engine should be sent to the test cell
- C.
  
  The meanings of the instruments readings
- D.
  
  What tools are required for maintenance
Correct Answer
C. 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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11.

Most engine monitoring gauges and instruments require some type of
- A.
  
  Electrical valve to the indicator
- B.
  
  Metal tubing for electron flow
- C.
  
  Radio frequency transmitter
- D.
  
  Transmitter and indicator
Correct Answer
D. 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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12.

What jet engine temperature is not measured?
- A.
  
  Exhaust gas
- B.
  
  Turbine inlet
- C.
  
  Combustion inlet
- D.
  
  Fan turbine inlet
Correct Answer
C. Combustion inlet

Explanation
The temperature of the combustion inlet is not measured in a jet engine.

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13.

A typical jet engine exhaust gas temperature indicating system contains thermocouples, leads, an indicator, and
- A.
  
  Resistor
- B.
  
  Turbine inlet
- C.
  
  Control valve
- D.
  
  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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14.

Which metals are used in the thermocouples of the exhaust gas temperature indicating system?
- A.
  
  Steel and iron
- B.
  
  Steel and alumel
- C.
  
  Iron and chromel
- D.
  
  Alumel and chromel
Correct Answer
D. 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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15.

The engine fuel-flow indicating system of most jet powered a/c contains a fuel-flow
- A.
  
  A transmitter and a float valve
- B.
  
  Control valve and a float valve
- C.
  
  Transmitter and a fuel-flow indicator
- D.
  
  Control valve and a fuel-flow transcriber
Correct Answer
C. 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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16.

The fuel system component of a jet engine that operates by using a water wheel concept is the fuel?
- A.
  
  Flow indicator
- B.
  
  Flow generator
- C.
  
  Flow transmitter
- D.
  
  Remaining counter
Correct Answer
C. Flow transmitter

Explanation
A flow transmitter is a device used in the fuel system component of a jet engine that operates by using a water wheel concept. It measures and transmits the flow rate of fuel, providing important information about the fuel consumption and efficiency of the engine. This helps in monitoring and controlling the fuel flow, ensuring optimal performance and safety of the jet engine.

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17.

Two units that work together to indicate the oil system is operating correctly are the oil pressure?
- A.
  
  Relief valve and indicator
- B.
  
  Transmitter and indicator
- C.
  
  Relief valve and transmitter
- D.
  
  Synchronous unit and indicator
Correct Answer
B. 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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18.

An oil pressure transmitter contains a mechanical section and?
- A.
  
  A hydraulic unit
- B.
  
  An electrical unit
- C.
  
  A pnuedraulic unit
- D.
  
  A synchronous unit
Correct Answer
D. A synchronous unit

Explanation
The correct answer is a synchronous unit. A synchronous unit is commonly found in an oil pressure transmitter along with the mechanical section. It helps in synchronizing the mechanical and electrical components of the transmitter, ensuring accurate measurement and transmission of oil pressure data.

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19.

The oil pressure indicator receives an electrical signal from the?
- A.
  
  Gyro
- B.
  
  Transmitter
- C.
  
  Hydraulic unit
- D.
  
  Synchronous unit
Correct Answer
B. Transmitter

Explanation
The correct answer is "transmitter" because the oil pressure indicator requires an electrical signal to function properly. A transmitter is a device that converts a physical quantity, in this case, the oil pressure, into an electrical signal that can be received by the indicator. Therefore, the oil pressure indicator receives an electrical signal from the transmitter to display the oil pressure accurately.

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20.

The two primary units of the tachometer indicating system are the tachometer generator and tachometer?
- A.
  
  Indicator
- B.
  
  Fuse panel
- C.
  
  Transformer
- D.
  
  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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21.

The tachometer indicator is?
- A.
  
  A mechanical magnetic-drag type instrument
- B.
  
  An electric magnetic-drag type instrument
- C.
  
  A mechanical direct-drive type instrument
- D.
  
  An electric direct-drive type instrument
Correct Answer
B. 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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22.

The frequency of the tachometer generator is proportional to the?
- A.
  
  Engine speed
- B.
  
  Transformer speed
- C.
  
  Speed of the electical magnet
- D.
  
  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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23.

On engines with afterburners, the position of the exhaust nozzle is converted into an electrical signal by a?
- A.
  
  Rheostat
- B.
  
  Rectifier
- C.
  
  Transducer
- D.
  
  Transformer
Correct Answer
C. 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. This is where a transducer comes in. It takes the mechanical motion of the exhaust nozzle and converts it into an electrical signal that can be easily measured and used for various purposes, such as engine control or monitoring.

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24.

During an operational check of the fire warning system, you press?
- A.
  
  Only the test switch
- B.
  
  Both TEST and NORMAL ON switches
- C.
  
  Only the TEST WARNING ON switches
- D.
  
  Both TEST ON and TEST OFF switches
Correct Answer
A. Only the test switch

Explanation
During an operational check of the fire warning system, pressing only the test switch would be the correct action. This is because the test switch is specifically designed to initiate a test sequence that checks the functionality of the fire warning system. Pressing both the TEST and NORMAL ON switches or only the TEST WARNING ON switches would not initiate the intended test sequence. Similarly, pressing both the TEST ON and TEST OFF switches would also not serve the purpose of testing the fire warning system.

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25.

What is used to indicate the amount of thrust a dual-compressor engine is producing?
- A.
  
  Engine press ratio(EPR)
- B.
  
  Revolutions per minute (rpm)
- C.
  
  Exhaust gas temperature (EGT)
- D.
  
  Turbine Inlet Temperature (TIT)
Correct Answer
A. Engine press ratio(EPR)

Explanation
The engine press ratio (EPR) is used to indicate the amount of thrust a dual-compressor engine is producing. EPR is a ratio of the total pressure at the engine inlet to the total pressure at the exhaust nozzle. It provides a measure of the engine's performance and is commonly used in aviation to monitor and control engine thrust output. RPM, EGT, and TIT are not directly related to the amount of thrust produced by the engine.

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26.

The term Pt2 means the?
- A.
  
  Total (T) pressure (P) at flange 2 (2)
- B.
  
  Total (T) pressure (P) at station 2 (2)
- C.
  
  Temperature (t) and pressure (p) at flanges 2 (2)
- D.
  
  Temperature (t) and pressure (p) at flange 2 (2)
Correct Answer
B. 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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27.

The pressures used in the operation of the engine pressure ratio (EPR) system are the?
- A.
  
  A engine inlet total pressure and exhaust total pressure
- B.
  
  Exhaust toatl pressure and turbine inlet total pressure
- C.
  
  Inlet total pressure and compressor discharge total pressure
- D.
  
  Compressor discharge total pressure and turbine inlet total pressure
Correct Answer
A. A engine inlet total pressure and exhaust total pressure

Explanation
The correct answer is "a engine inlet total pressure and exhaust total pressure". In the operation of the engine pressure ratio (EPR) system, the pressures used are the engine inlet total pressure and exhaust total pressure. These pressures are important in determining the efficiency and performance of the engine. The engine inlet total pressure represents the pressure at the entrance of the engine, while the exhaust total pressure represents the pressure at the exit of the engine. By measuring and controlling these pressures, the EPR system can optimize the engine's performance and ensure proper functioning.

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28.

Inlet pressure (Pt2) is transmitted from its sensing point?
- A.
  
  Electrically
- B.
  
  Mechanically
- C.
  
  Hydraulically
- D.
  
  Through tubing
Correct Answer
D. Through tubing

Explanation
The correct answer is "through tubing." Inlet pressure (Pt2) is transmitted from its sensing point through tubing. This means that the pressure is transferred using a system of tubes or pipes, allowing the pressure to be measured or monitored at a different location. This method is commonly used in various industries to ensure accurate pressure readings and to protect sensitive equipment from the direct impact of high-pressure fluids.

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29.

While testing an engine on an engine test cell, a breather pressure gauge displaying excessively high breather pressure is usually an indication of?
- A.
  
  A maladjusted engine pressure ratio system
- B.
  
  The oil system being underserviced
- C.
  
  Damage to engine bearing oil seals
- D.
  
  Low oil pressure
Correct Answer
C. Damage to engine bearing oil seals

Explanation
Excessively high breather pressure on an engine test cell is usually an indication of damage to engine bearing oil seals. The breather pressure gauge measures the pressure in the crankcase, and if the pressure is excessively high, it suggests that the oil seals, which prevent oil from leaking out of the bearings, are damaged. This can lead to oil leakage and potentially cause engine performance issues or damage.

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30.

The direct oil pressure gauge on a test cell is connected to an engine oil pressure line to indicate oil pressure without using wiring, indicator or
- A.
  
  A/c transformer
- B.
  
  Engine transformer
- C.
  
  A/c transmitter
- D.
  
  Engine transmitter
Correct Answer
C. A/c transmitter

Explanation
The direct oil pressure gauge on a test cell is connected to an a/c transmitter. This transmitter is responsible for converting the oil pressure into an electrical signal that can be interpreted by the gauge. It eliminates the need for wiring, an indicator, or an engine transformer. By using an a/c transmitter, the oil pressure can be accurately measured and displayed without the need for additional components or complicated wiring setups.

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31.

The test cell exhaust gas temperature (EGT) selector allows selection of?
- A.
  
  The EGT parameter for transit speeds
- B.
  
  Accuracy check switch during adjustment
- C.
  
  The EGT indicator to be read in digital or analog
- D.
  
  Individual thermocouple inputs or an average of these inputs
Correct Answer
D. Individual thermocouple inputs or an average of these inputs

Explanation
The test cell exhaust gas temperature (EGT) selector allows the selection of individual thermocouple inputs or an average of these inputs. This means that the EGT indicator can be read either for each individual thermocouple or for an average of all the thermocouples. This allows for flexibility in monitoring the EGT parameter based on specific needs or preferences.

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32.

The test cell fuel-flow rate indicator automatically controls the solenoid valves in the fuel module in order to divert fuel flow through the?
- A.
  
  Fuel control
- B.
  
  Flow turbines
- C.
  
  Fuel-oil coolers
- D.
  
  Flow cascades
Correct Answer
B. Flow turbines

Explanation
The correct answer is flow turbines. The test cell fuel-flow rate indicator controls the solenoid valves in the fuel module to divert fuel flow through the flow turbines. This is done in order to measure and regulate the flow of fuel in the system. The flow turbines are responsible for accurately measuring the fuel flow rate and providing feedback to the indicator.

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33.

When properly adjusted, the accuracy of the test cell N1 and N2 speed indicator in revolutions per minute (RPM) will be within?
- A.
  
  1 rpm
- B.
  
  2 rpm
- C.
  
  3 rpm
- D.
  
  4 rpm
Correct Answer
B. 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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34.

The test cell integrated circuit (IC) temperature indicator displays temperature in degrees Fahrenheit, with a range of ?
- A.
  
  -100 to +1000
- B.
  
  -75 to + 1400
- C.
  
  50 to + 1600
- D.
  
  -25 to 1800
Correct Answer
C. 50 to + 1600

Explanation
The correct answer is 50 to +1600. This range is the widest among the given options, indicating that the test cell IC temperature indicator can measure temperatures from as low as 50 degrees Fahrenheit to as high as 1600 degrees Fahrenheit.

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35.

What type of vibration causes unnecessary engine removals and unwarranted repairs?
- A.
  
  Forced
- B.
  
  Transient
- C.
  
  Unbalanced
- D.
  
  Externally excited
Correct Answer
D. Externally excited

Explanation
Externally excited vibrations refer to vibrations that are caused by external factors such as misalignment, resonance, or mechanical forces. These vibrations can lead to unnecessary engine removals and unwarranted repairs because they put extra stress on the engine components, causing them to wear out faster or become damaged. Therefore, the correct answer is externally excited.

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36.

What kind of engine vibration does not persist, but comes and goes?
- A.
  
  Forced
- B.
  
  Transient
- C.
  
  Resonance
- D.
  
  Externally excited
Correct Answer
B. 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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37.

During vibration analysis, frequency is usually measured in?
- A.
  
  Mills
- B.
  
  Phase lags
- C.
  
  Cycles per second
- D.
  
  Phases per second
Correct Answer
C. Cycles per second

Explanation
During vibration analysis, frequency is usually measured in cycles per second. This unit of measurement, also known as hertz (Hz), represents the number of complete oscillations or vibrations that occur in one second. It is a standard unit used to quantify the rate at which a vibrating object or wave repeats its motion. Measuring frequency in cycles per second allows for accurate analysis and comparison of vibrations in various systems and helps identify any potential issues or abnormalities.

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38.

During vibration analysis, amplitude is measured in mils. One mil is equal to?
- A.
  
  1.000 inch
- B.
  
  0.100 inch
- C.
  
  0.010 inch
- D.
  
  0.001 inch
Correct Answer
D. 0.001 inch

Explanation
During vibration analysis, amplitude is measured in mils. One mil is equal to 0.001 inch.

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39.

The two types of transducers used to measure vibration are?
- A.
  
  Velocity and phase accelerometer
- B.
  
  Velocity and displacement accelerometer
- C.
  
  Piezoelectric acceleromter and velocity
- D.
  
  Piezoelectric accelerometer and phase lag transducer
Correct Answer
C. Piezoelectric acceleromter and velocity

Explanation
The correct answer is piezoelectric accelerometer and velocity. Piezoelectric accelerometers are used to measure the acceleration of an object, while velocity transducers are used to measure the velocity of vibration. These two types of transducers are commonly used in vibration analysis and monitoring applications to accurately measure and analyze vibrations in various systems and structures.

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40.

Which type of vibration transducer is made up of certain ceramic compounds and natural crystals?
- A.
  
  Velocity
- B.
  
  Phase log
- C.
  
  Displacement accelerometer
- D.
  
  Piezoelectric accelerometer
Correct Answer
D. 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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41.

To find the instructions for installing vibration pickups at the test cell, you should check the?
- A.
  
  Test cell technical order
- B.
  
  Intermediate maintenance manual
- C.
  
  Organizational maintenance manual
- D.
  
  Methods and procedures maintenance manual
Correct Answer
B. Intermediate maintenance manual

Explanation
The intermediate maintenance manual would be the most appropriate source to find the instructions for installing vibration pickups at the test cell. This manual typically contains detailed procedures and guidelines for maintenance tasks that are more complex than those covered in the organizational maintenance manual. Since installing vibration pickups requires a certain level of technical expertise, the intermediate maintenance manual would likely provide the necessary instructions and specifications for this task. The test cell technical order may also contain relevant information, but the intermediate maintenance manual is more likely to have specific instructions for this particular task. The organizational maintenance manual and methods and procedures maintenance manual may not provide the level of detail needed for this installation.

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42.

When you are using a vibration analyzer , you will be notified when a preset signal has been exceeded by?
- A.
  
  A horn alarm
- B.
  
  Flashing red lights
- C.
  
  The sound of a buzzer
- D.
  
  Flashing channel indicator light emitting diode (LED)
Correct Answer
D. 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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43.

The filter selector switch on the vibration analyzer is used to?
- A.
  
  Provide an exact revolutions per minute (RPM) indication
- B.
  
  Indicate the amplitude of the overall vibration
- C.
  
  Display the frequency of the overall engine
- D.
  
  Allow selection of the necessary filter
Correct Answer
D. Allow selection of the necessary filter

Explanation
The filter selector switch on the vibration analyzer is used to allow selection of the necessary filter. This means that the switch enables the user to choose the appropriate filter to be applied to the vibration data being analyzed. The filters are used to eliminate or reduce unwanted frequencies or noise from the vibration signal, allowing for a more accurate and specific analysis of the desired vibration information.

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44.

What are used to support the fan and low-pressure turbine?
- A.
  
  Bushings
- B.
  
  Brackets
- C.
  
  Bearings
- D.
  
  Blades
Correct Answer
C. 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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45.

What procedure is used to ensure the fan and low-pressure turbine are correctly balanced?
- A.
  
  Engine trim
- B.
  
  Fan rotor trim balance
- C.
  
  Low-pressure turbine rotor trim balance
- D.
  
  High-pressure turbine rotor trim balance
Correct Answer
B. Fan rotor trim balance

Explanation
The procedure used to ensure the fan and low-pressure turbine are correctly balanced is called fan rotor trim balance. This process involves adjusting the weight distribution of the fan rotor to minimize any vibrations or imbalances that may occur during operation. By achieving the correct balance, the fan and low-pressure turbine can operate smoothly and efficiently, reducing the risk of damage and improving overall performance.

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46.

When operating an engine that is installed on a/c, position the a/c so the wind is blowing?
- A.
  
  At an unnoticeable level
- B.
  
  Directly into the inlet, within plus or minus 45 degrees
- C.
  
  At a 90 degrees angle to the engine exhaust
- D.
  
  Directly into the exhaust, within plus or minus 45 degrees
Correct Answer
B. 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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47.

The term trim means to adjust the engine systems for optimum performance per the limits in the TO, The two methods used to trim an engine are ?
- A.
  
  Hydraulic and mechanical
- B.
  
  Hydraulic and electronic
- C.
  
  Manual and mechanical
- D.
  
  Manual and electronic
Correct Answer
D. Manual and electronic

Explanation
The term "trim" refers to adjusting the engine systems for optimal performance within the limits specified in the Technical Order (TO). There are two methods used to trim an engine: manual and electronic. Manual trimming involves physically adjusting the engine components, while electronic trimming involves using electronic controls to make the necessary adjustments. Both methods are used to ensure that the engine operates at its best performance level while staying within the specified limits.

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48.

When checking the turbine section, you do not measure?
- A.
  
  FTIT
- B.
  
  TIT
- C.
  
  EGT
- D.
  
  IGT
Correct Answer
D. IGT

Explanation
When checking the turbine section, you do not measure the IGT.

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49.

Prior to starting the engine when doing an anti-ice valve ops check on an F-16c/d, place the anti-ice engine switch to?
- A.
  
  On
- B.
  
  Off
- C.
  
  Start
- D.
  
  Manual
Correct Answer
D. Manual

Explanation
Before starting the engine, when performing an anti-ice valve operations check on an F-16C/D, the anti-ice engine switch should be placed in the "manual" position. This is because the manual position allows the pilot to manually control the anti-ice valve, ensuring that it is functioning properly before starting the engine. The other options, such as "on," "off," and "start," do not provide the same level of control and would not be appropriate for this specific operation.

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50.

Which f-16 ops check allows you to start the JFS without advancing the throttle to idle or supplying fuel to the aircraft engine?
- A.
  
  Interface operational
- B.
  
  Bleed schedule
- C.
  
  Dry motoring
- D.
  
  Wet motoring
Correct Answer
C. 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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Quiz Review Timeline +

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Current Version
Mar 21, 2023

Quiz Edited by
ProProfs Editorial Team
Oct 22, 2012

Quiz Created by
Hamandcheese

2A651 Volume 5 Ure's

After reviewing the a/c & engine forms, where should you begin troubleshooting?

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

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

To become an expert troubleshooter, you must?

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

The PW-220 engine monitoring system component that acquires fault data from the DEEC and logs the faults with the time of their occurence is the?

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

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

To be considered effective tools for aviators, a/c instruments must be light weight, easy to read, and

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

Most engine monitoring gauges and instruments require some type of

What jet engine temperature is not measured?

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

Which metals are used in the thermocouples of the exhaust gas temperature indicating system?

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

The fuel system component of a jet engine that operates by using a water wheel concept is the fuel?

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

An oil pressure transmitter contains a mechanical section and?

The oil pressure indicator receives an electrical signal from the?

The two primary units of the tachometer indicating system are the tachometer generator and tachometer?

The tachometer indicator is?

The frequency of the tachometer generator is proportional to the?

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

During an operational check of the fire warning system, you press?

What is used to indicate the amount of thrust a dual-compressor engine is producing?

The term Pt2 means the?

The pressures used in the operation of the engine pressure ratio (EPR) system are the?

Inlet pressure (Pt2) is transmitted from its sensing point?

While testing an engine on an engine test cell, a breather pressure gauge displaying excessively high breather pressure is usually an indication of?

The direct oil pressure gauge on a test cell is connected to an engine oil pressure line to indicate oil pressure without using wiring, indicator or

The test cell exhaust gas temperature (EGT) selector allows selection of?

The test cell fuel-flow rate indicator automatically controls the solenoid valves in the fuel module in order to divert fuel flow through the?

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

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

What type of vibration causes unnecessary engine removals and unwarranted repairs?

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

During vibration analysis, frequency is usually measured in?

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

The two types of transducers used to measure vibration are?

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

To find the instructions for installing vibration pickups at the test cell, you should check the?

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

The filter selector switch on the vibration analyzer is used to?

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

What procedure is used to ensure the fan and low-pressure turbine are correctly balanced?

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

The term trim means to adjust the engine systems for optimum performance per the limits in the TO, The two methods used to trim an engine are ?

When checking the turbine section, you do not measure?

Prior to starting the engine when doing an anti-ice valve ops check on an F-16c/d, place the anti-ice engine switch to?

Which f-16 ops check allows you to start the JFS without advancing the throttle to idle or supplying fuel to the aircraft engine?