AET Electrical Troubleshooting 4

Question 1

A strobe light on an aircraft fails to flash but the power supply capacitor charges correctly. The fault most likely lies in the:

Accepted Answer

Flash tube or trigger circuit

Answer

If the capacitor charges correctly but the light fails to flash, the flash tube, trigger transformer, or trigger circuit is likely faulty.

Question 2

When checking a shorted wiring harness, a technician should use a/an:

Accepted Answer

Standard ohmmeter to check pin-to-pin resistance

Answer

A standard ohmmeter can detect pin-to-pin shorts within a harness by revealing unexpectedly low resistance between conductors that should be isolated.

Question 3

Aircraft wiring that shows discoloration (brown or black insulation) most likely indicates:

Accepted Answer

Overheating due to excessive current or poor connection

Answer

Discolored or charred insulation is a sign of overheating, caused by overcurrent, high-resistance connections, or incorrect wire gauge.

Question 4

A ground return circuit fault in aircraft wiring most commonly causes:

Accepted Answer

Reduced voltage at the load and erratic equipment operation

Answer

A poor ground return adds resistance in series with the load, causing a voltage drop that results in reduced voltage at the equipment and erratic operation.

Question 5

An ammeter is connected in series with an aircraft circuit to check current flow. When the circuit is activated, the meter reads zero. This indicates:

Accepted Answer

An open circuit between the power source and the load

Answer

Zero current in an energized series circuit indicates an open that prevents current from flowing through the ammeter and load.

(AET) Aircraft Electronics Technician Practice Test

(AET) Aircraft Electronics Technician Practice Test

AET Electrical Troubleshooting 4