Technical Knowledge and Skills Flashcards
7 cards from real AET practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Technical Knowledge and Skills flashcards as text
In a CMOS logic circuit used in avionics, what is the most critical handling precaution?
Answer: Use ESD wrist straps and grounded work surfaces to prevent electrostatic discharge
CMOS devices have very high input impedance and can be permanently damaged by electrostatic discharge (ESD), requiring grounded wrist straps and ESD-safe work surfaces during handling.
Per IPC-A-610 and aerospace soldering standards, a solder joint exhibiting a concave fillet, shiny surface, and full lead outline is classified as:
Answer: An acceptable solder joint
A concave fillet, smooth shiny surface, and visible lead outline are all indicators of a correctly wetted, thermally sound solder joint per IPC-A-610 workmanship standards.
An ARINC 664 (AFDX) network in a modern aircraft serves as a replacement for which older avionics data bus architecture?
Answer: ARINC 429 point-to-point buses
AFDX (Avionics Full-Duplex Switched Ethernet, ARINC 664 Part 7) was developed to replace the many point-to-point ARINC 429 links with a higher-bandwidth switched network.
A MIL-STD-1553B data bus uses which physical medium and topology?
Answer: Twisted shielded pair with transformer coupling in a bus topology at 1 Mbps
MIL-STD-1553B uses a shielded twisted pair bus with transformer-coupled stubs, operating at 1 Mbps in a command/response protocol with one Bus Controller and up to 31 Remote Terminals.
Fiber optic cables used in avionics data systems are preferred over copper conductors primarily because they:
Answer: Are immune to electromagnetic interference and have much greater bandwidth potential
Fiber optic cables transmit data as light pulses and are completely immune to EMI/RFI, making them ideal for avionics applications where electromagnetic compatibility is critical.
When installing a D-sub connector backshell on an avionics cable, the primary purpose of the backshell's strain relief is to:
Answer: Prevent mechanical stress on individual conductor solder joints or crimps at the connector pins
The backshell strain relief clamps the cable jacket to transfer axial and bending loads to the cable jacket rather than to the individual pin solder joints or crimp connections.
A logic analyzer shows that a data bus has valid framing and clock, but all data bits read as logic '1'. The most likely cause is:
Answer: An open circuit on the data line causing it to float to the pull-up rail
An open data line with a pull-up resistor will float to the positive supply (logic '1'), causing all bits to read as '1' regardless of what the driver is transmitting.