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Questions and Answers
What is the primary aim of heat treatment?
Which of the following methods uses a diamond tip to measure depth?
What occurs when there is a separation of plies in multi-laminate materials?
What defines the term 'pot life' in relation to resins?
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Which aluminum alloy is represented by the Raised Double Dash designation?
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What are the two types of nuts mentioned?
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Which type of key is specifically designed to transmit mechanical power from a shaft to a hub?
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What is the purpose of a shear castle nut?
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What is the function of a cotter pin?
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Which of the following is NOT a classification of a key mentioned?
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What are hollow saddle keys hollowed to fit?
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What distinguishes a flat saddle key from other keys?
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What is the characteristic of non-self locking nuts?
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What is the primary characteristic of driving key type gears?
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Which component is capable of transmitting both pulling and pushing forces?
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What is the main advantage of cables in airplane transmission systems?
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Which of the following gears allows for infinitely variable rotation speed?
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Which transmission component is primarily used for small force transmission at high rotational speeds?
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Which type of coupling is designed for disconnectable operations only?
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What is the maximum storage temperature for aluminum rivets to prevent damage?
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What type of coupling is utilized when the direction of the axes of the shafts changes at an angle?
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What is the purpose of solution annealing in aluminum rivets?
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What is the rotational movement capability of a Taper Lok fastener?
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Which nut is specifically designed for use on aircraft engines but not approved for airframe use?
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Which type of joint consists of elastic clutch disks connected to a flange?
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What is the primary use of a feather key in mechanical applications?
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How long can aluminum rivets be stored at -20 degrees?
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What is the angle of rotation for the shaft axes in a dry disk joint?
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Which type of nut is permanently housed at the outer end with an unthreaded nylon insert?
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What is a characteristic feature of Monel rivets?
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What is the purpose of a lock nut?
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Which rivet type is typically used to join aluminum alloy components when a low-strength rivet is acceptable?
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What defines the upset head of a rivet?
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What is the requirement for selecting the correct rivet diameter?
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Study Notes
Cold Welding and Adhesives
- Cold welding involves bonding surfaces without heat, primarily using adhesives.
- Effectiveness of Adhesives: Depends on resistance to slippage, shrinkage, malleability, cohesive strength, and adhesion.
Riveting and Fasteners
- Blind Rivets: Deform at the back when tension is applied.
- Solid Rivet Formation: Achieved by causing deformation known as upset head.
- Airloc Fasteners: Comprise a receptacle, stud, and cross pin; can be fixed or floating types.
- Self-Tapping Screws: Utilized for securing thin-gauge metal where traditional nuts and bolts are impractical.
Key Materials and Alloy Types
- 2017 Aluminum Alloy (D)
- 2024 Aluminum Alloy (DD)
- 2117 Aluminum Alloy (AD)
- 5056 Aluminum Alloy (B)
Material Failures
- Delamination: Occurs when layers in multi-laminate materials separate.
- Debonding: Separation of stringer from skin due to adhesive failure.
Resin Properties
- Pot Life: Time allowed to work with resins before they harden.
- Shelf Life: Duration products remain usable in unopened containers; varies by product.
Fasteners and Nuts
- Types of Nuts: Non-self-locking (used with drilled shank fasteners), and locking nuts (not reusable).
- Classification of Nuts: Includes shear castle, castle, slotted engine, and wing nuts, each designed for specific applications.
- Nyloc and Oddie Stiff Nuts: Designed with inserts or tongues to ensure secure locking.
Rivet Specifications
- Correct rivet diameter must be at least three times the thickest sheet being joined.
- Aluminum Rivets: Used for low-strength attachments; Monel rivets for steel and titanium assemblies.
Cable and Transmission Mechanisms
- Bowden Cables: Designed for pull operations, used in disconnectable couplings.
- Heat Treatment of Aluminum Rivets: Involves solution annealing at 495°C followed by rapid cooling.
- Torque Tube Transmissions: Used for transmitting swinging or rotating movements in mechanisms.
Gear and Drive Systems
- Stepped Transmission Gears: Adjust meet desired rotational speed through lateral movement; used for variable speeds.
- Friction Gear Setup: Allows for infinitely variable speeds; effective at low force transfer.
- Coney Pulley Drive: Transmits smaller forces at high rotational speeds.
Control Mechanisms in Aircraft
- Cables: Serve as key transmission components, requiring minimum tensile strength of 1200N/mm².
- Push Rods: Operate control surfaces like rudders and flaps, allowing for force transmission.
- Cable Quadrants: Transfer forces between cables and push rods effectively; critical in flight control systems.
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Description
Test your knowledge on cold welding and the substances used to bond surfaces together. This quiz covers various adhesive properties, types of rivets, and specific cables like Quadrax cables. Challenge yourself with questions related to materials and their applications in engineering.
