FAA Aviation Mechanic General
Knowledge Test Questions And
Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant
Download Pdf
1. Which type of force is produced by a pressure difference acting
over an area?
A. Torque
B. Pressure force
C. Friction
D. Centrifugal force
Answer: B. Pressure force
Rationale: Pressure acting on a surface produces a force. The
magnitude of that force depends on the pressure and the area over
which the pressure acts. This principle is fundamental to hydraulic,
pneumatic, and aerodynamic systems used throughout aircraft.
2. What is the standard unit of force in the International System of
Units?
A. Joule
B. Watt
C. Newton
D. Pascal
Answer: C. Newton
,Rationale: The newton is the SI unit of force. One newton is the force
required to accelerate a one-kilogram mass at one meter per second
squared. Understanding units is essential when interpreting technical
data and performing maintenance calculations.
3. What is the primary purpose of aircraft maintenance technical
publications?
A. To replace mechanic judgment
B. To provide approved or acceptable maintenance information
C. To establish aircraft purchase prices
D. To provide pilot navigation information
Answer: B. To provide approved or acceptable maintenance
information
Rationale: Maintenance manuals, service information, illustrated parts
information, and other applicable publications provide the procedures,
limitations, specifications, and data necessary to perform maintenance
correctly and safely.
4. Which material property describes a material's ability to resist
deformation under load?
A. Elasticity
B. Hardness
C. Stiffness
D. Conductivity
Answer: C. Stiffness
Rationale: Stiffness is the resistance of a material to deformation when
a load is applied. A stiff material may resist bending or stretching even
though it may have other properties, such as strength or hardness, that
differ from those of another material.
, 5. What is the purpose of a torque wrench?
A. To measure electrical resistance
B. To measure rotational speed
C. To apply a specified torque to a fastener
D. To determine bolt diameter
Answer: C. To apply a specified torque to a fastener
Rationale: A torque wrench allows a mechanic to tighten a fastener to
a specified rotational force. Correct torque helps establish proper
clamping force without producing excessive or insufficient loading of
the fastener or structure.
6. What does the term "ductility" describe?
A. Ability to resist scratching
B. Ability to be drawn into wire
C. Ability to resist corrosion
D. Ability to conduct electricity
Answer: B. Ability to be drawn into wire
Rationale: Ductility is the ability of a material to undergo plastic
deformation in tension and commonly be drawn into wire. Ductile
materials can deform substantially before fracture, which can provide
warning before complete failure.
7. Which property describes a material's ability to absorb energy
before fracture?
A. Toughness
B. Conductivity
C. Brittleness
D. Elasticity
, Answer: A. Toughness
Rationale: Toughness represents a material's ability to absorb energy
and withstand deformation before fracturing. It is particularly
important for aircraft components exposed to impact, vibration,
repeated loading, and changing stresses.
8. What is the purpose of a safety wire installation?
A. To increase bolt tensile strength
B. To prevent fasteners from loosening
C. To lubricate fasteners
D. To seal hydraulic fittings
Answer: B. To prevent fasteners from loosening
Rationale: Safety wire provides a mechanical means of preventing
properly tightened fasteners from rotating loose. It does not replace
proper torque, and the wire must be installed so that its tension tends
to keep the fastener tightened.
9. Which tool is most appropriate for accurately measuring the
outside diameter of a small shaft?
A. Steel rule
B. Micrometer
C. Protractor
D. Feeler gauge
Answer: B. Micrometer
Rationale: A micrometer provides precise measurement of outside
dimensions such as shaft diameters. It is substantially more accurate
than a standard rule and is commonly used when close dimensional
tolerances are involved.
Knowledge Test Questions And
Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant
Download Pdf
1. Which type of force is produced by a pressure difference acting
over an area?
A. Torque
B. Pressure force
C. Friction
D. Centrifugal force
Answer: B. Pressure force
Rationale: Pressure acting on a surface produces a force. The
magnitude of that force depends on the pressure and the area over
which the pressure acts. This principle is fundamental to hydraulic,
pneumatic, and aerodynamic systems used throughout aircraft.
2. What is the standard unit of force in the International System of
Units?
A. Joule
B. Watt
C. Newton
D. Pascal
Answer: C. Newton
,Rationale: The newton is the SI unit of force. One newton is the force
required to accelerate a one-kilogram mass at one meter per second
squared. Understanding units is essential when interpreting technical
data and performing maintenance calculations.
3. What is the primary purpose of aircraft maintenance technical
publications?
A. To replace mechanic judgment
B. To provide approved or acceptable maintenance information
C. To establish aircraft purchase prices
D. To provide pilot navigation information
Answer: B. To provide approved or acceptable maintenance
information
Rationale: Maintenance manuals, service information, illustrated parts
information, and other applicable publications provide the procedures,
limitations, specifications, and data necessary to perform maintenance
correctly and safely.
4. Which material property describes a material's ability to resist
deformation under load?
A. Elasticity
B. Hardness
C. Stiffness
D. Conductivity
Answer: C. Stiffness
Rationale: Stiffness is the resistance of a material to deformation when
a load is applied. A stiff material may resist bending or stretching even
though it may have other properties, such as strength or hardness, that
differ from those of another material.
, 5. What is the purpose of a torque wrench?
A. To measure electrical resistance
B. To measure rotational speed
C. To apply a specified torque to a fastener
D. To determine bolt diameter
Answer: C. To apply a specified torque to a fastener
Rationale: A torque wrench allows a mechanic to tighten a fastener to
a specified rotational force. Correct torque helps establish proper
clamping force without producing excessive or insufficient loading of
the fastener or structure.
6. What does the term "ductility" describe?
A. Ability to resist scratching
B. Ability to be drawn into wire
C. Ability to resist corrosion
D. Ability to conduct electricity
Answer: B. Ability to be drawn into wire
Rationale: Ductility is the ability of a material to undergo plastic
deformation in tension and commonly be drawn into wire. Ductile
materials can deform substantially before fracture, which can provide
warning before complete failure.
7. Which property describes a material's ability to absorb energy
before fracture?
A. Toughness
B. Conductivity
C. Brittleness
D. Elasticity
, Answer: A. Toughness
Rationale: Toughness represents a material's ability to absorb energy
and withstand deformation before fracturing. It is particularly
important for aircraft components exposed to impact, vibration,
repeated loading, and changing stresses.
8. What is the purpose of a safety wire installation?
A. To increase bolt tensile strength
B. To prevent fasteners from loosening
C. To lubricate fasteners
D. To seal hydraulic fittings
Answer: B. To prevent fasteners from loosening
Rationale: Safety wire provides a mechanical means of preventing
properly tightened fasteners from rotating loose. It does not replace
proper torque, and the wire must be installed so that its tension tends
to keep the fastener tightened.
9. Which tool is most appropriate for accurately measuring the
outside diameter of a small shaft?
A. Steel rule
B. Micrometer
C. Protractor
D. Feeler gauge
Answer: B. Micrometer
Rationale: A micrometer provides precise measurement of outside
dimensions such as shaft diameters. It is substantially more accurate
than a standard rule and is commonly used when close dimensional
tolerances are involved.
