AET Technical Knowledge and Skills 2

Question 1

What is the standard word length for data transmitted on an ARINC 429 data bus?

Accepted Answer

32 bits

Answer

16 bits

Answer

24 bits

Answer

64 bits

Question 2

A VOR receiver indicates a 'TO' flag with full left CDI deflection. The aircraft is flying directly TOWARD the station. What is the most likely cause?

Accepted Answer

The OBS is set 90° off from the inbound course

Answer

The aircraft is on the correct course and the CDI is calibrated correctly

Answer

The VOR station is transmitting an alarm signal

Answer

The receiver AGC circuit has failed

Question 3

Standard aircraft AC bus voltage and frequency for most commercial transport aircraft is:

Accepted Answer

115V AC at 400 Hz

Answer

28V AC at 400 Hz

Answer

115V AC at 60 Hz

Answer

26V AC at 400 Hz

Question 4

Which component of an ILS system provides lateral course guidance to the runway centerline?

Accepted Answer

Localizer transmitter

Answer

Glide slope transmitter

Answer

Outer marker beacon

Answer

Middle marker beacon

Question 5

A Mode C transponder reply includes which of the following information?

Accepted Answer

Pressure altitude and squawk code

Answer

Aircraft ID and heading

Answer

Aircraft ID only

Answer

GPS position and altitude

Question 6

DME (Distance Measuring Equipment) operates on the principle of measuring:

Accepted Answer

Round-trip pulse propagation time between aircraft and ground station

Answer

The phase difference between two RF signals

Answer

Doppler shift of a carrier frequency

Answer

Signal strength attenuation over distance

Question 7

When troubleshooting an avionics system using a dual-trace oscilloscope, what is the primary advantage of using the 'chop' mode versus 'alternate' mode at low frequencies?

Accepted Answer

Chop mode switches between traces rapidly enough that both appear continuous at low sweep speeds

Answer

Chop mode provides higher bandwidth for fast signals

Answer

Chop mode eliminates ground loops in the measurement

Answer

Chop mode automatically triggers on both channels simultaneously