Component Repair Practice Exam

FAA Repairman Certificate – Electrical Component Repair Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What is the primary purpose of a rectifier in an aircraft electrical

system?

• To convert AC to DC
• To convert DC to AC
• To store electrical energy
• To regulate voltage

Correct answer: A. To convert AC to DC

Rationale: A rectifier changes alternating current (AC) to direct

current (DC) for systems that require steady voltage.

• What type of solder is commonly used in aircraft electrical repairs?
• 40/60 tin-lead 1 / 4

• 60/40 tin-lead
• 50/50 tin-lead
• 70/30 tin-lead

Correct answer: B. 60/40 tin-lead

Rationale: The 60/40 tin-lead mix provides good conductivity and a

proper melting point for secure electrical joints.

• What is the main function of a capacitor in an electrical circuit?
• To resist current flow
• To increase circuit resistance
• To store electrical energy
• To reduce voltage

Rationale: Capacitors temporarily store and release electrical energy

to smooth out voltage variations or filter noise.

• When testing a diode, what reading indicates a good diode in forward

bias?

• Infinite resistance
• Low resistance
• Zero resistance both ways
• High resistance both ways

Rationale: A good diode conducts current in one direction, showing

low resistance forward and high resistance reverse. 2 / 4

• What color wire is typically used for aircraft ground circuits?
• Red
• Black
• Blue
• Yellow

Rationale: Black wires are standard for ground circuits in aircraft

electrical systems to maintain consistency.

6. The purpose of a fuse in an aircraft circuit is to:

• Protect the circuit from excessive current
• Increase voltage output
• Convert AC to DC
• Regulate temperature

Rationale: Fuses act as safety devices that open the circuit when

excessive current flows, preventing damage.

• What is the function of a relay?
• To regulate voltage
• To store energy
• To control high current with a low current signal
• To generate electricity 3 / 4

Rationale: Relays allow small control currents to switch larger loads

safely and efficiently.

• When crimping terminals, which factor is most important?
• Using the correct crimping tool and die for the terminal size
• Using extra pressure for tightness
• Heating the wire before crimping
• Soldering after crimping

Rationale: Proper tool and die ensure reliable mechanical and

electrical contact.

• Which instrument measures current flow directly?
• Voltmeter
• Ammeter
• Ohmmeter
• Megger

Rationale: Ammeters measure current in amperes by being

connected in series with the circuit.

• Which type of corrosion commonly affects aluminum electrical

connectors?

• Galvanic corrosion
• / 4