AET Diagnostic and Testing Tools 2

Question 1

When using a clamp-on ammeter to measure AC current in an aircraft wiring harness, the technician should ensure which of the following?

Accepted Answer

Only one conductor passes through the clamp jaw

Answer

A clamp-on ammeter measures the magnetic field produced by a single conductor; placing multiple conductors cancels their fields and gives a false reading.

Question 2

A Time Domain Reflectometer (TDR) is primarily used in aircraft maintenance to:

Accepted Answer

Locate faults and determine their distance in coaxial or wire runs

Answer

A TDR sends a pulse down a conductor and analyzes the reflected signal to pinpoint fault location and distance.

Question 3

Which instrument is the correct tool for verifying the output frequency of an aircraft inverter?

Accepted Answer

Frequency counter or oscilloscope

Answer

A frequency counter or oscilloscope directly measures the cycles per second of an inverter's AC output.

Question 4

A logic probe displaying a steady LOW on a digital avionics bus line most likely indicates:

Accepted Answer

The line is being held at ground potential or is open

Answer

A steady LOW typically means the line is being actively pulled to ground or is open with a pull-down resistor.

Question 5

What is the primary purpose of a breakout box in avionics troubleshooting?

Accepted Answer

To provide access points to individual pins of a connector without removing it from the LRU

Answer

A breakout box intercepts the connector to expose each pin for measurement while the unit remains in its normal circuit configuration.

(AET) Aircraft Electronics Technician Practice Test

(AET) Aircraft Electronics Technician Practice Test

AET Diagnostic and Testing Tools 2