Trivia Facts Quiz On Aircraft Electrical Systems And Engine!

Coaxial cable is the correct answer because it is specifically designed to transmit radio frequency signals with minimal interference and loss. It consists of a central conductor surrounded by an insulating layer, a metallic shield, and an outer insulating layer. This construction allows for efficient transmission of high frequency signals without external interference. Single strand cable and multistrand cables are not suitable for connecting radio and high frequency equipment as they do not provide the same level of signal integrity and shielding.

The correct answer is "only if allowed by the repair scheme." This means that blind rivets can only be replaced by solid shank rivets if the repair scheme, which outlines the approved methods and materials for repairs, allows for it. The repair scheme is a set of guidelines and instructions that technicians must follow when conducting repairs, and it determines what alternatives can be used in specific situations. Therefore, the decision to replace blind rivets with solid shank rivets must be based on the approval of the repair scheme.

Alcad is a layer of pure aluminum rolled on the surface of heated aluminum alloy metal. The given answer states that the total thickness allowable for Alcad is maximum 5% of the base material thickness. This means that the layer of pure aluminum should not exceed 5% of the thickness of the underlying aluminum alloy metal. Any thickness greater than 5% would not be within the allowable limits for Alcad.

In high-temperature climate conditions, the heat can cause the cables in the aircraft to expand. As the cables expand, they will exert more force and tension, leading to an increase in cable tension. This increase in tension is a result of the thermal expansion of the cables due to the high temperature, and it can have an impact on the overall performance and safety of the aircraft.

For an aircraft with a hydraulic system that operates above 3000psi, stainless steel tubing is the most likely choice for the fluid line. Stainless steel is known for its high strength and corrosion resistance, making it suitable for handling high-pressure fluids. It can withstand the high pressures and stresses associated with the hydraulic system, ensuring the safety and reliability of the aircraft. Pure aluminum tubing may not have sufficient strength to handle such high pressures, while aluminum alloy tubing may not provide the same level of corrosion resistance as stainless steel.

A heavy criss-cross wear pattern on the groove of the pulley is likely due to excessive cable tension. When the tension on the cable is too high, it can cause the cable to rub against the sides of the pulley groove, leading to wear marks in a criss-cross pattern. This excessive tension can occur due to various reasons such as incorrect setup or adjustments, improper maintenance, or the use of a cable that is too strong for the application.

The lead of a shaft is the distance the shaft moves axially in one complete revolution. In a single start thread, there is only one thread wrapped around the shaft, so one complete revolution of the thread will move the shaft by the distance equal to the pitch of the thread. Therefore, the lead of the shaft will be equal to the pitch.

Chromium-Molybdenum material is used on landing gear and engine mount because it provides excellent strength, toughness, and resistance to corrosion. These components of an aircraft are subjected to high stress and extreme conditions, so using this material ensures their durability and reliability. Additionally, the use of Chromium-Molybdenum helps to maintain the structural integrity and safety of the aircraft during takeoff, landing, and in-flight operations.

Acrylic plastic can be damaged by cleaning solvent because certain solvents contain chemicals that can react with the acrylic material, causing it to become discolored, cracked, or even dissolve. Acrylic is a sensitive material that requires gentle cleaning methods, and using harsh solvents can lead to irreversible damage. It is important to use mild cleaning solutions specifically designed for acrylic surfaces to avoid any potential harm.

Anodic oxidation is a process used to enhance the corrosion resistance and durability of metal surfaces. It involves creating a protective oxide layer on the surface of the metal through an electrochemical reaction. Aluminum alloy is a commonly used material for anodic oxidation because it forms a dense and stable oxide layer that provides excellent corrosion resistance. On the other hand, non-stainless steel and stainless steel do not typically undergo anodic oxidation as they already have their own inherent corrosion resistance properties.

Cast aluminum is the most brittle among the given options. This is because cast aluminum is formed by pouring molten aluminum into a mold, which results in a less uniform and more porous structure compared to other aluminum alloys. The presence of these pores weakens the material and makes it more prone to cracking and breaking under stress. On the other hand, 2017 aluminum alloy and 2024 aluminum are both stronger and less brittle due to their different compositions and manufacturing processes.

The correct answer is to refer to the structure repair manual. This is because the manual will provide specific instructions and guidelines on how to determine the wrap direction of the top layer of fabric for a composite structure that requires repair. The manual will likely have detailed diagrams, illustrations, or step-by-step instructions that can be followed to accurately determine the wrap direction.

The primary alloying element of 2024 Aluminum alloy is copper. Copper is added to aluminum to enhance its strength and hardness. It also improves the alloy's resistance to corrosion and provides good machinability. The addition of copper in 2024 Aluminum alloy allows it to have high strength-to-weight ratio, making it suitable for applications that require lightweight but strong materials, such as aerospace components and structural materials.

The crimping of electrical wires using a lug should have at least the same strength as the wire to ensure a secure and reliable connection. If the crimping is weaker than the wire, it may result in a loose connection or potential failure, leading to electrical hazards or malfunctions. Therefore, it is crucial to ensure that the crimping has the same strength or higher to maintain the integrity and safety of the electrical system.

The selection of an engine valve spring should consider its fatigue strength. This is because the valve spring undergoes repeated cycles of compression and expansion, which can lead to fatigue failure over time. Fatigue strength refers to the ability of a material to withstand these repeated cycles without experiencing failure. Therefore, choosing a valve spring with a high fatigue strength is essential to ensure its longevity and prevent premature failure in the engine.

The correct answer is at the end of the push pull rod. This is because the locking wire should not go through the inspection hole at the end of the push pull rod. The inspection hole is likely used for checking the condition or alignment of the push pull rod, and inserting the locking wire through it could interfere with its function or cause damage. Therefore, it is important to avoid inserting the locking wire through this particular inspection hole.

The acceptable check to confirm delamination of a composite material is to first use the coin tap method. If no fault is found during the coin tap, then it is followed by an ultrasonic test. This means that if the coin tap does not reveal any delamination, the ultrasonic test is used as a further confirmation to ensure there are no hidden faults or delamination within the material.

Inconel is a type of nickel-chromium-based alloy known for its high resistance to corrosion and heat. Stainless steel is also a corrosion-resistant alloy that contains chromium, making it the closest resemblance to Inconel among the given options. High carbon steel and aluminum alloy do not possess the same level of corrosion resistance and heat resistance as Inconel and stainless steel.

The correct answer is "Metric thread of 60 degree". This is because aeronautical screw threads typically use metric threads that have a 60-degree angle. The B4 screw and American standard are not specifically mentioned in relation to aeronautical screw threads, and the American NC threads, although related to aeronautics, are not specifically mentioned in the given information. Therefore, the metric thread of 60 degrees is the most accurate and relevant answer based on the information provided.

The correct answer is the total length of countersunk rivet. This means that the length of the rivet includes both the shank and the countersunk head. The countersunk head is designed to sit flush with the surface it is being riveted to, so it is important to consider its length when determining the overall length of the rivet.