.
NCATT AET & AEIT Endorsement Exam – National Center for
Agricultural Education and Teacher Training – 2026/2027 Edition –
Questions and Answers for Prospective Agricultural Education
Teachers
1. What is the primary mechanism by which Electromagnetic Interference (EMI)
affects avionics systems?
A) Thermal heating of conductors
B) Unwanted coupling of electromagnetic energy into sensitive circuits
C) Galvanic corrosion of connectors
D) Electrostatic discharge from human touch
Correct Answer: B
Rationale: EMI occurs when electromagnetic energy from a source couples into a
sensitive circuit (the victim), causing unwanted noise, false data, or system malfunction .
2. What is the definition of 'Grounding' in the context of aircraft electrical
systems?
A) The connection of non-current carrying conductive elements.
,B) Establishing a physical wire path that gives electricity a path to earth/ground.
C) The process of plating a copper wire with tin to slow oxidation.
D) The measure of opposition to the flow of current in a wire.
Correct Answer: B
Rationale: Grounding establishes a physical wire path for electrical current to return to
the source or to the earth, providing a safe path and a stable reference point .
3. What is the definition of 'Bonding' in aircraft maintenance?
A) The act of connecting a wire to a circuit breaker.
B) The process of identifying a wire with a printed sleeve.
C) The connection of non-current carrying conductive elements, like enclosures and
structures.
D) The measurement of a circuit's total opposition to current flow.
Correct Answer: C
Rationale: Bonding is the electrical connection between non-current carrying metallic
parts to ensure a low-impedance path and prevent static electricity buildup .
4. Copper wire used in aircraft is commonly plated with Tin, Silver, or Nickel. What
is the primary reason for this?
A) To increase the wire's current-carrying capacity.
B) To provide a slower oxidation rate than bare copper.
C) To make the wire easier to bend during installation.
D) To reduce the overall weight of the wire.
Correct Answer: B
Rationale: Copper wire is plated to protect it from corrosion. Tin, silver, and nickel all
have slower oxidation rates than bare copper, ensuring a reliable connection .
5. According to standard aircraft wiring practices, the voltage drop in wires should
not exceed what percentage of the regulated voltage?
A) 1%
B) 2%
C) 5%
,D) 10%
Correct Answer: B
Rationale: Voltage drop should not exceed 2% of the regulated voltage to ensure that
connected equipment receives adequate power to operate correctly .
6. What is the allowable voltage drop for a 28-volt continuous circuit?
A) 1 volt
B) 2 volts
C) 5 volts
D) 4 volts
Correct Answer: A
Rationale: Using the 2% rule, a 28-volt circuit can have a voltage drop of 28 * 0.02 =
0.56 volts. The closest value is 1 volt .
7. What is the function of a shielded wire?
A) To allow for a higher voltage rating.
B) To provide a visual indicator of circuit status.
C) To trap electromagnetic energy radiated from the wire and carry it to ground.
D) To increase the wire's resistance to heat.
Correct Answer: C
Rationale: The braided metal jacket of a shielded wire traps electromagnetic energy
and provides a path to ground, preventing it from radiating and causing interference .
8. What is the primary purpose of a Technical Standard Order (TSO)?
A) To approve a part for installation on an aircraft.
B) To define the minimum performance standard for specified materials, parts, and
appliances.
C) To provide a manufacturer with authorization to produce and sell parts.
D) To outline the methods for logging maintenance actions.
Correct Answer: B
Rationale: A TSO is a minimum performance standard for certain aviation articles.
Importantly, TSO authorization does not automatically approve the part for installation .
, 9. What does a Parts Manufacturer Approval (PMA) allow a company to do?
A) Perform major repairs on an aircraft.
B) Produce and sell FAA-approved aircraft articles that are eligible for installation on
FAA Type Certificated Products.
C) Approve the design of a new type of aircraft.
D) Issue airworthiness certificates for newly manufactured aircraft.
Correct Answer: B
Rationale: A PMA is a production approval that allows a company to manufacture and
sell replacement parts for installation on type-certificated aircraft .
10. Which type of diagram is best utilized for troubleshooting an electrical system?
A) Installation diagram
B) Wiring diagram
C) Schematic diagram
D) Block diagram
Correct Answer: C
Rationale: A schematic diagram shows the principle of operation and the logical
relationship between components, making it the best tool for understanding how a
circuit works and where a fault might be .
11. How should identification markings be placed on a wire that is longer than 3
inches?
A) Only at one end of the wire.
B) At each end of the wire and at 15-inch maximum intervals.
C) At each end and at 6-inch intervals.
D) Only at the center of the wire.
Correct Answer: B
Rationale: To ensure traceability, wires should be identified at their terminations and at
regular intervals along their length, not exceeding 15 inches .
12. If direct marking on a wire is not possible, what is the approved method for
indirect marking?
NCATT AET & AEIT Endorsement Exam – National Center for
Agricultural Education and Teacher Training – 2026/2027 Edition –
Questions and Answers for Prospective Agricultural Education
Teachers
1. What is the primary mechanism by which Electromagnetic Interference (EMI)
affects avionics systems?
A) Thermal heating of conductors
B) Unwanted coupling of electromagnetic energy into sensitive circuits
C) Galvanic corrosion of connectors
D) Electrostatic discharge from human touch
Correct Answer: B
Rationale: EMI occurs when electromagnetic energy from a source couples into a
sensitive circuit (the victim), causing unwanted noise, false data, or system malfunction .
2. What is the definition of 'Grounding' in the context of aircraft electrical
systems?
A) The connection of non-current carrying conductive elements.
,B) Establishing a physical wire path that gives electricity a path to earth/ground.
C) The process of plating a copper wire with tin to slow oxidation.
D) The measure of opposition to the flow of current in a wire.
Correct Answer: B
Rationale: Grounding establishes a physical wire path for electrical current to return to
the source or to the earth, providing a safe path and a stable reference point .
3. What is the definition of 'Bonding' in aircraft maintenance?
A) The act of connecting a wire to a circuit breaker.
B) The process of identifying a wire with a printed sleeve.
C) The connection of non-current carrying conductive elements, like enclosures and
structures.
D) The measurement of a circuit's total opposition to current flow.
Correct Answer: C
Rationale: Bonding is the electrical connection between non-current carrying metallic
parts to ensure a low-impedance path and prevent static electricity buildup .
4. Copper wire used in aircraft is commonly plated with Tin, Silver, or Nickel. What
is the primary reason for this?
A) To increase the wire's current-carrying capacity.
B) To provide a slower oxidation rate than bare copper.
C) To make the wire easier to bend during installation.
D) To reduce the overall weight of the wire.
Correct Answer: B
Rationale: Copper wire is plated to protect it from corrosion. Tin, silver, and nickel all
have slower oxidation rates than bare copper, ensuring a reliable connection .
5. According to standard aircraft wiring practices, the voltage drop in wires should
not exceed what percentage of the regulated voltage?
A) 1%
B) 2%
C) 5%
,D) 10%
Correct Answer: B
Rationale: Voltage drop should not exceed 2% of the regulated voltage to ensure that
connected equipment receives adequate power to operate correctly .
6. What is the allowable voltage drop for a 28-volt continuous circuit?
A) 1 volt
B) 2 volts
C) 5 volts
D) 4 volts
Correct Answer: A
Rationale: Using the 2% rule, a 28-volt circuit can have a voltage drop of 28 * 0.02 =
0.56 volts. The closest value is 1 volt .
7. What is the function of a shielded wire?
A) To allow for a higher voltage rating.
B) To provide a visual indicator of circuit status.
C) To trap electromagnetic energy radiated from the wire and carry it to ground.
D) To increase the wire's resistance to heat.
Correct Answer: C
Rationale: The braided metal jacket of a shielded wire traps electromagnetic energy
and provides a path to ground, preventing it from radiating and causing interference .
8. What is the primary purpose of a Technical Standard Order (TSO)?
A) To approve a part for installation on an aircraft.
B) To define the minimum performance standard for specified materials, parts, and
appliances.
C) To provide a manufacturer with authorization to produce and sell parts.
D) To outline the methods for logging maintenance actions.
Correct Answer: B
Rationale: A TSO is a minimum performance standard for certain aviation articles.
Importantly, TSO authorization does not automatically approve the part for installation .
, 9. What does a Parts Manufacturer Approval (PMA) allow a company to do?
A) Perform major repairs on an aircraft.
B) Produce and sell FAA-approved aircraft articles that are eligible for installation on
FAA Type Certificated Products.
C) Approve the design of a new type of aircraft.
D) Issue airworthiness certificates for newly manufactured aircraft.
Correct Answer: B
Rationale: A PMA is a production approval that allows a company to manufacture and
sell replacement parts for installation on type-certificated aircraft .
10. Which type of diagram is best utilized for troubleshooting an electrical system?
A) Installation diagram
B) Wiring diagram
C) Schematic diagram
D) Block diagram
Correct Answer: C
Rationale: A schematic diagram shows the principle of operation and the logical
relationship between components, making it the best tool for understanding how a
circuit works and where a fault might be .
11. How should identification markings be placed on a wire that is longer than 3
inches?
A) Only at one end of the wire.
B) At each end of the wire and at 15-inch maximum intervals.
C) At each end and at 6-inch intervals.
D) Only at the center of the wire.
Correct Answer: B
Rationale: To ensure traceability, wires should be identified at their terminations and at
regular intervals along their length, not exceeding 15 inches .
12. If direct marking on a wire is not possible, what is the approved method for
indirect marking?
