CAT Avionics and Electrical Systems 3

Question 1

What is the function of a Constant Current Regulator (CCR) used in aircraft runway lighting circuits?

Accepted Answer

Maintain steady current through series-connected lamp circuits regardless of lamp count

Answer

Convert AC power to DC for approach lighting systems

Answer

Dim cockpit lighting during night operations

Answer

Detect and report burned-out runway light bulbs to the tower

Question 2

MIL-DTL-38999 circular electrical connectors used in aerospace applications feature which type of coupling mechanism?

Accepted Answer

Threaded screw-type coupling

Answer

Bayonet quarter-turn lock

Answer

Push-pull snap-fit

Answer

Magnetic latching

Question 3

What is the primary purpose of electrical bonding between aircraft structural components?

Accepted Answer

Establish low-resistance electrical paths to equalize potential and provide a common ground

Answer

Increase resistance between dissimilar metals to prevent galvanic corrosion

Answer

Insulate electrical cables from the metallic airframe structure

Answer

Prevent voltage spikes from entering sensitive avionics equipment

Question 4

Which FAA regulation and advisory circular specifically governs Electrical Wiring Interconnection System (EWIS) installation requirements for transport category aircraft?

Accepted Answer

FAR Part 25 / AC 25.1701

Answer

FAR Part 23 / AC 23.1309

Answer

FAR Part 121 / AC 121-22

Answer

FAR Part 43 / AC 43.13-1B

Question 5

What is 'crosstalk' in the context of aircraft avionics wiring and signal integrity?

Accepted Answer

Unintended electromagnetic coupling between adjacent signal paths causing interference

Answer

Voice communication interference between pilot and co-pilot intercoms

Answer

Data transfer between two redundant flight management computers

Answer

A wiring fault mode where two conductors exchange polarity

Question 6

Which test instrument should an aerospace technician use to measure the insulation resistance of aircraft wiring in megohms?

Accepted Answer

Megohmmeter (Megger)

Answer

Oscilloscope

Answer

Digital multimeter set to the resistance (Ω) function

Answer

Clamp-on ammeter

Question 7

What does ADS-B (Automatic Dependent Surveillance-Broadcast) transmit to improve situational awareness?

Accepted Answer

Aircraft GPS-derived position, altitude, velocity, and identification to all receivers

Answer

Weather radar returns to nearby aircraft

Answer

ILS localizer and glideslope signals for instrument approaches

Answer

TCAS resolution advisories to air traffic control