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Quizzes > Science

Temperature Pressure Relief Valve Quiz: 2A654 CDC URE

Quick, free ure practice quiz to check your 2A654 valve knowledge. Instant results.

Editorial: Review CompletedCreated By: Jacob BoggsUpdated Aug 23, 2025
Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art illustration of quiz cards and check marks on dark blue background highlighting AFSC 2A654 CDC quiz.

This temperature pressure relief valve quiz helps you check key functions, inspection steps, and safety actions for 2A654 CDC work. Practice with realistic items and get quick feedback to spot weak areas before test day. For more study, try the cdcs 2a551 practice test and the 2a653 cdc vol 1 quiz. For pressure-system context, see the high pressure boiler quiz.

What does AFSC stand for in Air Force specialty coding?
Aerospace Force Skills Code
Air Force Specialty Code
Air Force System Code
Airframe and Fuel Systems Certification
AFSC stands for Air Force Specialty Code, which is the classification system for all Air Force jobs. Each AFSC identifies a specific career field and skill level. The 2A654 code specifically denotes aircraft structural maintenance.
What is the primary purpose of a Technical Order (TO)?
Logistical supply management
Provide administrative policy
Standardize maintenance and repair procedures
Authorize personnel promotions
A Technical Order provides standardized procedures and detailed instructions for maintenance, repair, and operation of equipment. It ensures consistency and compliance across all units. TOs are mandatory references for Air Force maintenance personnel.
Which tool is used to measure torque on bolted connections?
Feeler gauge
Calibrated torque wrench
Micrometer
Dial indicator
A calibrated torque wrench applies a specific torque to fasteners, ensuring proper tension. Using the correct torque prevents damage and loosening. It is a critical tool in aircraft maintenance.
Which hydraulic fluid is commonly identified by purple dye in USAF aircraft?
MIL-PRF-5606
MIL-PRF-83282 (Skydrol)
Hydraulic Grade 7
MIL-PRF-7870 (Skydrol)
Skydrol hydraulic fluids like MIL-PRF-83282 are dyed purple for easy identification. MIL-PRF-5606 is dyed red. Proper fluid identification prevents system contamination and component failure.
Which personal protective equipment (PPE) is mandatory when working around running aircraft engines?
Safety glasses only
Rubber gloves only
Steel-toe boots only
Hearing protection and safety glasses
Hearing protection and safety glasses protect against high noise levels and foreign object debris. Engines can produce noise above safe exposure limits. PPE compliance is required by AFOSH standards.
What form is used to document aircraft maintenance status and discrepancies?
AFTO Form 95
AF Form 1149
AFTO Form 781 Series
AF Form 332
The AFTO Form 781 series logs maintenance actions, servicing, and discrepancies. It provides a complete history of aircraft status. Accurate record keeping ensures safety and readiness.
Which pressure unit is commonly used for hydraulic system measurements?
Volts
Ohms
PSI (pounds per square inch)
Lumens
Hydraulic pressures are measured in PSI (pounds per square inch). This unit indicates force per area. Technicians use pressure gauges calibrated in PSI to verify system performance.
What is the primary hazard when using a pneumatic torque wrench indoors without proper ventilation?
Airborne oil mist inhalation
Electric shock
Radiation exposure
Excessive noise
Pneumatic tools can generate oil mist which, if inhaled, can cause respiratory irritation. Proper ventilation or mist collectors are required indoors. This hazard is addressed in AFOSH regulations.
Which reference contains the aircraft weight and balance data?
Technical Order Index
Aircraft Flight Manual (AFM)
Maintenance Instruction Card
AFTO Form 95
The Aircraft Flight Manual contains official weight and balance information. It lists empty weights, center-of-gravity limits, and loading procedures. Proper weight and balance ensures safe aircraft performance.
What color coding is used on warning placards for immediate hazards requiring corrective action before flight?
Yellow background, black letters
Blue background, white letters
Red background, white letters
Green background, white letters
Red placards with white letters indicate immediate hazards that must be corrected before flight. Yellow indicates caution. Standardized color coding ensures quick hazard recognition.
Which fire extinguisher type is recommended for class B (fuel) fires in maintenance areas?
Class A water extinguisher
CO2 extinguisher
Halon 1211 extinguisher
Class D powder extinguisher
Halon 1211 extinguishers are effective on class B fuel fires. They leave no residue and are non-conductive. Halon is authorized for aviation fuel fire response.
What does the term 'NDT' stand for in structural inspection?
Next Day Testing
Non-Destructive Testing
Neutral Density Technique
Non-Developmental Technology
Non-Destructive Testing involves inspecting materials for defects without causing damage. Methods include ultrasonic, dye-penetrant, and eddy current tests. NDT is essential for verifying structural integrity.
Which tool is best for checking alignment of landing gear components?
Multimeter
Feeler gauge
Laser alignment tool
Micrometer
Laser alignment tools provide precise, non-contact measurements. They help ensure landing gear tracks correctly. Proper alignment prevents uneven wear and handling issues.
What is the minimum safe distance to stand from an operating jet engine inlet during start?
25 feet
10 feet
50 feet
5 feet
Standing at least 25 feet from the inlet prevents ingestion hazards from high suction. This distance is mandated in many engine start procedures. Safe distances protect personnel from FOD and injury.
Which gauge measures the thickness of paint or coatings on aircraft surfaces?
Pressure gauge
Vernier caliper
Thermocouple
Coating thickness gauge
Coating thickness gauges use magnetic or eddy-current principles to measure paint thickness. They ensure coatings meet specification for corrosion protection. Accurate readings prevent over- or under-coating.
In TO numbering, what does the prefix '1H-' typically indicate?
Engine system manual
Structural repair procedures
Avionics troubleshooting guide
Hydraulic system maintenance
The prefix '1H-' designates engine system technical orders. Each prefix categorizes manuals by system. Proper TO identification speeds finding correct procedures.
What is the first step in troubleshooting a hydraulic system low-pressure warning?
Check fluid level and reservoir filter
Replace hydraulic pump
Torque hydraulic fittings
Bleed actuator lines
Low fluid level or a clogged reservoir filter is the most common cause of low pressure. Inspecting fluid and filter is a quick initial check. This step often resolves simple warnings.
Which inspection method uses a dye to reveal surface cracks?
Radiographic inspection
Magnetic particle inspection
Dye penetrant inspection
Ultrasonic inspection
Dye penetrant inspection applies colored dye to surfaces; cracks draw the dye out and retain it after cleaning. A developer makes the dye visible. It's ideal for non-magnetic metals.
What component regulates the flow of hydraulic fluid to landing gear actuators during retraction?
Pump bypass valve
Pressure relief valve
Selector valve
Hydraulic reservoir
Selector valves direct fluid to specific actuators, like landing gear cylinders. They switch between extend and retract circuits. Proper operation ensures smooth gear movement.
During engine start, what does a sustained high ITT (interstage turbine temperature) indicate?
Fuel control nozzles clogged
Oil pressure low
Excessive fuel flow or no airflow
Ignition system failure
High ITT during start can mean too much fuel is injected or insufficient compressor airflow. Airflow issues or fuel control malfunctions are common causes. Monitoring ITT prevents turbine damage.
Which TO series covers corrosion prevention and control for USAF aircraft?
TO 1-1-4
TO 1-1-8
TO 00-5-1
TO 1-1-691
TO 1-1-8 is the Corrosion Prevention and Control manual for USAF aircraft. It details inspection, treatment, and record requirements. Proper corrosion control extends aircraft life.
What is the correct sequence for troubleshooting an electrical circuit?
Test, repair, identify, isolate
Repair, test, isolate, identify
Identify, isolate, repair, test
Isolate, test, identify, repair
Effective troubleshooting follows identify the symptom, isolate the fault, repair defective parts, then test to confirm. This structured approach saves time and resources. It's taught in electrical maintenance courses.
Which material is commonly used for aircraft structural repairs due to its high strength-to-weight ratio?
Pure titanium
A36 steel
3003 aluminum alloy
2024 aluminum alloy
2024 aluminum alloy is widely used in aircraft structures for its excellent fatigue resistance and strength-to-weight ratio. It is repairable by common shop processes. Many manuals specify 2024 for skin and spar repairs.
What instrument measures engine RPM via magnetic pickup?
Tachometer
Voltmeter
Manometer
Thermometer
A tachometer uses a magnetic pickup on the accessory gearbox to sense teeth passing a sensor and compute RPM. It provides real-time engine speed data to the cockpit. Calibration ensures accurate readings.
Which TO specifies safety hazards and protective measures for maintenance tasks?
TO 1-1-4
TO 00-20-1
TO 00-5-1 (AFOSH Standard)
TO 1-1-8
TO 00-5-1 is the AFOSH Standard covering safety hazards and measures across maintenance activities. It outlines PPE, lockout/tagout, and hazard communication protocols. Adherence reduces workplace injuries.
What tool is required to check the alignment of drive shafts connected by universal joints?
Infrared thermometer
Spirit level
Tachometer
Dial indicator and magnetic base
A dial indicator measures runout and misalignment at the universal joint yokes. Magnetic bases hold the dial indicator steady. Proper alignment prevents vibration and premature wear.
During fuel system maintenance, what precaution prevents contamination?
Open all caps simultaneously
Leave panels open overnight for drying
Use unfiltered shop air for blowing lines
Clean and cap all connections immediately
Cleaning and capping prevents dirt and moisture from entering fuel lines during servicing. Contamination can clog filters and damage components. Strict cleanliness is required by fuel system TOs.
What device protects hydraulic systems from overpressure by diverting fluid?
Selector valve
Flow divider
Pressure relief valve
Check valve
Pressure relief valves open at a set pressure to return fluid to reservoir or pump inlet. They prevent system damage from spikes. Proper adjustment is critical for safe operation.
What is the cause of a hydraulic system cavitation and how is it detected?
Air entrainment in fluid; detected by foaming in reservoir
Low fluid viscosity; detected by filter bypass
Excessive temperature; detected by overheat light
High backpressure; detected by pressure relief chatter
Cavitation occurs when vapor bubbles form due to low inlet pressure or air entrainment. Foaming in the reservoir and unusual pump noise indicate cavitation. It leads to pump damage if uncorrected.
Which structural repair technique uses heat and pressure to bond layers of composite material?
Spot welding
Field splice repair
Vacuum bag cure
Cold layup
Vacuum bag curing applies uniform pressure and heat to remove air and bond composite plies. This yields high-quality repairs in composite structures. It's detailed in composite repair TOs.
What phenomenon causes a jet engine compressor stall during rapid throttle changes?
Overfueling the combustor
Disruption of airflow leading to blade flow separation
Fuel pump cavitation
Oil contamination of bearings
A compressor stall occurs when airflow separates from the compressor blades due to sudden demand changes. This separation disrupts pressure rise and can cause backflow. Avoided by proper throttle scheduling and variable geometry.
How is stress corrosion cracking prevented in high-strength aircraft aluminum alloys?
Shot peening without coating
Applying pure water rinse only
Storage at high humidity
Using corrosion-inhibiting primers and regular inspections
Corrosion-inhibiting primers and sealants block corrosive elements from contact. Regular NDT inspections detect early cracking. Proper maintenance prevents stress corrosion failures.
What is the function of an orifice check valve in a hydraulic system?
Relieve excess pressure to reservoir
Allow restricted flow one way and positive check the other
Permit free flow in both directions
Divide flow equally between branches
An orifice check valve permits fluid through an orifice in one direction and locks in the reverse direction. This controls actuator extension and retraction speeds. It also prevents backflow.
During non-destructive eddy-current inspection, what indicates a subsurface crack?
No signal output
Abrupt change in signal amplitude or phase
Consistent baseline signal
Change in probe lift-off value
When an eddy-current probe passes a crack, the disturbance alters the signal amplitude and phase. Qualified technicians interpret these changes on a display. Subsurface indications require further evaluation.
Which calibrates ultrasonic inspection equipment for thickness measurement?
Magnetic flux meter
Standard pressure gauge
Reference block with known thicknesses
Surface tachometer
Ultrasonic reference blocks of known thickness calibrate both velocity and gain settings. Calibration ensures accuracy in detecting material loss. They are specified in inspection procedures.
What is the purpose of shot peening on metal aircraft components?
Increase surface hardness only
Improve electrical conductivity
Introduce compressive surface stresses to improve fatigue life
Reduce component weight
Shot peening bombards surfaces with small spheres to create residual compressive stresses. These stresses impede crack initiation and growth. It significantly extends fatigue life of parts.
Which chemical treatment converts aluminum oxide to a corrosion-resistant layer before primer application?
Anodizing
Electroplating
Phosphating
Passivation
Anodizing thickens the natural oxide layer on aluminum, increasing corrosion resistance and improving paint adhesion. It's specified prior to priming certain parts. The process uses sulfuric acid electrolytes.
How do thermal expansion discrepancies between aluminum and steel fasteners get managed in assembly?
Tighten faster to reduce gaps
Use washers or flanged heads to distribute loads
Use lubricants to equalize expansion
Apply torque at operational temperature only
Washers and flanged heads help distribute stress and allow for differential expansion. They prevent galling and loosening due to temperature changes. Proper hardware selection is detailed in installation TOs.
What analysis is performed to verify that a repair splice does not overstress the remaining structure?
Thermal cycling test
Corrosion rate assessment
Fatigue life prediction
Stress analysis using finite element modeling
Finite element modeling simulates loads and predicts stress distribution in a repair splice. It ensures stresses remain within allowable limits. Many structural repair approvals require FEA.
Which ground support equipment is critical for maintaining correct engine bleed air pressure during anti-icing tests?
Auxiliary power unit only
Hydraulic test stand
Ground air cart with pressure regulator
Coolant evacuation cart
A ground air cart supplies controlled regulated air for engine anti-icing tests. It allows simulation of bleed air pressure without running the engine. This ensures accurate functional checks.
In diagnosing a hydraulic servo valve oscillation, what advanced test identifies valve spool instability?
Static pressure decay test
Reservoir temperature profiling
Frequency response analysis using a dynamic signal analyzer
Manual flow rate measurement
Frequency response analysis measures servo valve gain and phase across frequencies. Spool instability appears as peaks or dips in the response curve. This advanced test pinpoints dynamic faults.
What electrochemical method is used to apply a corrosion-resistant primer to aluminum in the field?
Spray painting only
Dip galvanizing
Electrophoretic deposition (e-coat)
Thermal spray aluminum
E-coat uses an electric field to deposit primer uniformly on complex shapes. It ensures complete coverage and strong adhesion. Portable e-coat systems exist for field applications.
Which crack growth model predicts fatigue life in multi-axial stress fields for repaired structures?
Reynolds equation
Archard wear model
Paris' law using stress intensity factors
Coffin-Manson relationship
Paris' law relates crack growth rate to stress intensity factor range under cyclic loading. It applies to multi-axial fields when stress intensity factors are computed. Used in advanced structural durability analysis.
What non-contact measurement technique uses interferometry to detect surface deformations after repair?
Ultrasonic phased array
Electronic holographic interferometry
Thermographic imaging
Laser Doppler vibrometry
Electronic holographic interferometry uses laser light interference patterns to visualize minute surface deformations. It is extremely sensitive and non-contact. Ideal for verifying repair integrity and stress relief.
How is hydrogen embrittlement assessed in high-strength steel fasteners post-nitriding?
Magnetic particle inspection only
Visual surface finish check
Bend test and microhardness survey
Eddy current surface scan
A bend test reveals brittle fracture characteristics from hydrogen embrittlement. Microhardness surveys detect hardness anomalies. These methods confirm fasteners meet post-nitriding specifications.
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Study Outcomes

  1. Apply 2A654 maintenance procedures -

    Use CDC URE quiz scenarios to practice key AFSC 2A654 maintenance standards and technical guidelines.

  2. Analyze URE questions -

    Break down typical 2A654 URE quiz items to identify underlying concepts and answer strategies effectively.

  3. Assess knowledge gaps -

    Pinpoint areas of strength and weakness in aircraft maintenance to target further study and practice.

  4. Sharpen diagnostic skills -

    Improve troubleshooting abilities by engaging with realistic AFSC 2A654 practice test questions.

  5. Enhance exam readiness -

    Develop confidence and time-management techniques for timed 2A654 CDC quizzes and URE evaluations.

  6. Demonstrate proficiency -

    Prove your expertise in aircraft maintenance standards by achieving a high score on the 2A654 CDC quiz.

Cheat Sheet

  1. Mastering Technical Orders (TOs) -

    Review the numbering and layout of Air Force Technical Orders (TO 00-5-1) and AFI 21-101 to swiftly locate maintenance procedures. Use the mnemonic "1xxx=flight manuals, 2xxx=airframe" to streamline lookups during your 2A654 CDC quiz. This proficiency saves time on AFSC 2A654 practice tests and real-world maintenance tasks.

  2. Electrical Systems & Ohm's Law -

    Understand Ohm's Law (V=IR) and Kirchhoff's rules to troubleshoot wiring and power distribution on aircraft. Apply the "VIR gin" trick - V divided by I equals R - to avoid calculation errors when answering 2A654 URE questions on the aircraft maintenance quiz. Practicing with official USAF circuit simulators bolsters your confidence and accuracy.

  3. Non-Destructive Inspection (NDI) Techniques -

    Familiarize yourself with visual, dye penetrant, and ultrasonic methods following ASTM E1417 and AFI 21-101 guidelines. Recall "See, Dye, Sound" as a quick sequence: visual check first, then penetrant, then ultrasonic scan. Nailing NDI concepts is crucial for both the 2A654 CDC quiz and safe aircraft operations.

  4. Hydraulic Systems & Pascal's Principle -

    Apply Pascal's Principle (P=F/A) to calculate pressures and forces in landing gear and flight control hydraulics per MIL-HDBK-245 standards. Work through sample problems from AFIs to ensure you can solve reservoir capacity and pressure-leak scenarios. Mastery of these calculations will help you ace your AFSC 2A654 practice test.

  5. Torque-Tension Relationship -

    Study the torque-preload formula T=K·D·F (nut factor × bolt diameter × preload force) as outlined in FAA Advisory Circular AC 43-13-1B. Use the "Three-P" checklist - Plate alignment, Protection applied, Proper tool used - when performing fastener installations. Precision torque application is a recurring theme on the 2A654 URE questions and essential for optimal aircraft assembly.

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