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The CAET exam has 100 questions and runs 1 hours 30 minutes.
These 10 free CAET questions are organized by exam domain, so you can see how each part of the Certified Aircraft Electronics Technician blueprint is tested. Reveal the answer and explanation under each question.
A maintenance entry for a minor avionics repair on a U.S. Part 91 airplane describes the work, identifies the maintenance data, gives the completion date, and names the technician who performed it. The authorized mechanic approving the repair has signed the entry. Under 14 CFR 43.9, what must also accompany that approval?
Correct answer: C - The approver's certificate number and kind of certificate.
A VHF radio resets when keyed but receives normally. During an approved loaded check, the source remains at 28.0 V. Referenced to source negative, the radio supply pin measures 27.8 V and its return pin measures 4.6 V. With the radio disconnected, supply-to-return measures 28.0 V. Where do these readings localize the excessive voltage drop?
Correct answer: B - In the radio's return path to source negative.
An inverter has continuous output limits of 180 W and 200 VA. A single-phase load draws 2.0 A RMS at 115 V RMS with a power factor of 0.60; voltage and current are sinusoidal. No starting transient is involved. Which assessment correctly applies both inverter limits?
Correct answer: D - The load is 138 W and 230 VA, so only the VA limit is exceeded.
A VHF COM receiver remains muted at a directly injected signal level that the bench procedure requires it to receive with squelch enabled. Overriding squelch produces clear audio, and the receiver then passes its sensitivity check. Stronger signals open the squelch normally. Which action best addresses these results?
Correct answer: D - Check the squelch threshold against its specified setting.
For an ILS receiver check, NAV 1 is tuned to 110.30 MHz. Localizer deviation checks pass, but the glideslope remains flagged. The test-set configuration lists only a 110.30 MHz localizer output. Which additional RF stimulus is needed to exercise the paired vertical-guidance channel?
Correct answer: C - 335.00 MHz with glideslope modulation applied.
The discrepancy report describes a climb in which the conventional altimeter stopped changing, the vertical-speed indicator settled at zero, and indicated airspeed became lower than the reading from an independent, serviceable system. All three affected instruments share one static source; the airspeed indicator's pitot line is separate. Which single fault accounts for the combined indications?
Correct answer: A - A blockage in the shared static-pressure supply.
An ARINC 429 analyzer decodes the expected altitude label with valid odd parity and a plausible numeric value. The word uses binary-number representation (BNR), and its sign/status matrix is bit 31 = 0, bit 30 = 1. The receiving display flags the altitude as invalid. What does the transmitted status mean?
Correct answer: B - No computed data; disregard the altitude value.
A batch of newly crimped connector contacts passes continuity testing, but samples fail the required wire-to-contact pull test. The wire gauge and contact part numbers are correct. The crimp tool was fitted with a positioner intended for a different contact series. How should the affected terminations be corrected?
Correct answer: A - Replace the affected contacts using the specified tool setup.
A DC-capable clamp meter has been zeroed and checked. With its jaws around both conductors of an operating two-wire, 28 V DC blower circuit, it reads approximately zero. The blower is running normally. To obtain the blower's load current, the technician should:
Correct answer: A - Clamp around the positive conductor alone.
While a nickel-cadmium aircraft battery is on constant-voltage charge, its temperature and charging current begin rising rapidly together. The charger controls are accessible without approaching the battery. What is the immediate priority?
Correct answer: C - Stop charging from the safe control point.
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