AM AM Electrical Systems & Avionics 2 — Questions and Answers
Question 1: Which component converts AC generator output to DC for aircraft bus use?
- Transformer
- Rectifier/TRU (Correct answer)
- Inverter
- Voltage regulator
Correct answer: Rectifier/TRU
A Transformer Rectifier Unit (TRU) steps down AC voltage and converts it to DC for the aircraft's DC bus.
Question 2: What does a transponder Mode C provide to ATC?
- Aircraft identification only
- Aircraft position and heading
- Pressure altitude and identification (Correct answer)
- Ground speed and track
Correct answer: Pressure altitude and identification
Mode C transponders encode and transmit the aircraft's pressure altitude along with its squawk code to ATC radar.
Question 3: A static inverter in an aircraft converts:
- DC to AC (Correct answer)
- AC to DC
- High voltage AC to low voltage AC
- 28V DC to 14V DC
Correct answer: DC to AC
A static inverter converts DC power from the aircraft bus to AC power needed by instruments and avionics equipment.
Question 4: What is the function of an aircraft VOR receiver?
- Measures distance to a ground station
- Provides magnetic bearing to/from a VOR station (Correct answer)
- Receives weather data broadcasts
- Tracks GPS satellite signals
Correct answer: Provides magnetic bearing to/from a VOR station
A VOR receiver measures the phase difference between reference and variable signals to determine the aircraft's magnetic bearing to or from a VOR ground station.
Question 5: When replacing an aircraft antenna coaxial cable, what must be verified after installation?
- Cable temperature rating only
- VSWR (Voltage Standing Wave Ratio) (Correct answer)
- Cable color coding
- Connector pin count
Correct answer: VSWR (Voltage Standing Wave Ratio)
VSWR must be measured after coaxial cable replacement to verify proper impedance matching and antenna system efficiency.
Question 6: Which document defines the approved avionics equipment for a specific aircraft?
- Pilot Operating Handbook only
- Aircraft Equipment List / AFMS (Correct answer)
- AC 43.13-1B
- FAR Part 91
Correct answer: Aircraft Equipment List / AFMS
The Aircraft Equipment List or Approved Flight Manual Supplement (AFMS) documents which avionics are approved for installation on a specific aircraft.
AM AM Electrical Systems & Avionics 2
Which component converts AC generator output to DC for aircraft bus use?