ASTM NCATT Aircraft Power Distribution
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From Real Past Papers Questions – A Set Of
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Questions And Answers In Details 100%
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Grade A+
1. The primary purpose of an aircraft power distribution system is to:
A. Increase engine thrust
B. Store hydraulic fluid
C. Distribute electrical power safely to aircraft systems
D. Reduce aircraft drag
Answer: C. Distribute electrical power safely to aircraft systems
Explanation: The power distribution system routes electrical power from the
generating source to aircraft loads while providing protection and control.
2. What component primarily protects an electrical circuit from excessive
current?
A. Relay
B. Switch
C. Circuit breaker
D. Bus bar
Answer: C. Circuit breaker
Explanation: Circuit breakers automatically open the circuit when current exceeds
a safe value.
, 3. A bus bar is used to:
A. Measure voltage
B. Increase resistance
C. Distribute electrical power to multiple circuits
D. Generate electricity
Answer: C. Distribute electrical power to multiple circuits
Explanation: Bus bars provide a common connection point for distributing
electrical power.
4. Which type of wire is commonly used in aircraft electrical systems?
A. Solid copper house wire
B. Steel wire
C. Aluminum fencing wire
D. Stranded copper wire
Answer: D. Stranded copper wire
Explanation: Stranded copper wire provides flexibility and resists vibration-induced
failure.
5. The main bus normally receives power directly from the:
A. Fuel pump
B. Hydraulic pump
C. Generator or battery
D. Pitot tube
Answer: C. Generator or battery
Explanation: The main bus distributes power supplied by generators or batteries.
6. A feeder circuit connects:
A. Two light bulbs
B. Two switches
C. The power source to a distribution bus
D. A resistor to ground
, Answer: C. The power source to a distribution bus
Explanation: Feeders carry electrical power from the source to distribution points.
7. Which device allows remote switching of high-current circuits?
A. Fuse
B. Ammeter
C. Relay
D. Capacitor
Answer: C. Relay
Explanation: Relays use a low-current control circuit to operate a high-current
circuit.
8. What is the function of a contactor?
A. Increase voltage
B. Reduce current
C. Switch high-current electrical circuits
D. Measure resistance
Answer: C. Switch high-current electrical circuits
Explanation: Contactors are heavy-duty relays designed for high-current
applications.
9. Essential buses are designed to:
A. Operate cabin lighting only
B. Supply entertainment systems
C. Power critical aircraft equipment
D. Charge portable devices
Answer: C. Power critical aircraft equipment
Explanation: Essential buses keep critical systems powered during electrical
failures.
10.What does a fuse do after opening due to excessive current?
A. Resets automatically
Assessment Newest (2025 - 2026 Update)
From Real Past Papers Questions – A Set Of
100 Most Common Exam Frequently Tested
Questions And Answers In Details 100%
Verified Exam Highly Recommendable For
Grade A+
1. The primary purpose of an aircraft power distribution system is to:
A. Increase engine thrust
B. Store hydraulic fluid
C. Distribute electrical power safely to aircraft systems
D. Reduce aircraft drag
Answer: C. Distribute electrical power safely to aircraft systems
Explanation: The power distribution system routes electrical power from the
generating source to aircraft loads while providing protection and control.
2. What component primarily protects an electrical circuit from excessive
current?
A. Relay
B. Switch
C. Circuit breaker
D. Bus bar
Answer: C. Circuit breaker
Explanation: Circuit breakers automatically open the circuit when current exceeds
a safe value.
, 3. A bus bar is used to:
A. Measure voltage
B. Increase resistance
C. Distribute electrical power to multiple circuits
D. Generate electricity
Answer: C. Distribute electrical power to multiple circuits
Explanation: Bus bars provide a common connection point for distributing
electrical power.
4. Which type of wire is commonly used in aircraft electrical systems?
A. Solid copper house wire
B. Steel wire
C. Aluminum fencing wire
D. Stranded copper wire
Answer: D. Stranded copper wire
Explanation: Stranded copper wire provides flexibility and resists vibration-induced
failure.
5. The main bus normally receives power directly from the:
A. Fuel pump
B. Hydraulic pump
C. Generator or battery
D. Pitot tube
Answer: C. Generator or battery
Explanation: The main bus distributes power supplied by generators or batteries.
6. A feeder circuit connects:
A. Two light bulbs
B. Two switches
C. The power source to a distribution bus
D. A resistor to ground
, Answer: C. The power source to a distribution bus
Explanation: Feeders carry electrical power from the source to distribution points.
7. Which device allows remote switching of high-current circuits?
A. Fuse
B. Ammeter
C. Relay
D. Capacitor
Answer: C. Relay
Explanation: Relays use a low-current control circuit to operate a high-current
circuit.
8. What is the function of a contactor?
A. Increase voltage
B. Reduce current
C. Switch high-current electrical circuits
D. Measure resistance
Answer: C. Switch high-current electrical circuits
Explanation: Contactors are heavy-duty relays designed for high-current
applications.
9. Essential buses are designed to:
A. Operate cabin lighting only
B. Supply entertainment systems
C. Power critical aircraft equipment
D. Charge portable devices
Answer: C. Power critical aircraft equipment
Explanation: Essential buses keep critical systems powered during electrical
failures.
10.What does a fuse do after opening due to excessive current?
A. Resets automatically
