AMT 102 FINAL EXAM 2026/2027 | COMPLETE
QUESTIONS AND ANSWERS (VERIFIED ANSWERS) |
EXAM PREP | LATEST EXAM GUIDE 2026&2027
1. Which electrical quantity represents the opposition to current flow in an aircraft circuit?
A. Voltage
B. Resistance
C. Power
D. Capacitance
Answer: B
Resistance is the opposition a circuit presents to current flow. It is measured in ohms and is a
fundamental factor in aircraft electrical troubleshooting.
2. A technician measures 24 volts across a circuit having 6 ohms of resistance. What
current should be expected?
A. 4 amperes
B. 6 amperes
C. 18 amperes
D. 144 amperes
Answer: A
Ohm's law states I = E/R. Dividing 24 volts by 6 ohms gives 4 amperes.
3. What is the primary purpose of a circuit protection device such as a fuse or circuit
breaker?
A. Increase circuit voltage
B. Improve electrical efficiency
C. Prevent excessive current from damaging wiring and components
D. Maintain constant resistance
Answer: C
Circuit protection devices interrupt a circuit when current exceeds a safe value, protecting
conductors and equipment from overheating or damage.
4. Two resistors are connected in series. How does the total resistance compare with either
individual resistor?
,A. It is always lower than both
B. It is equal to the smaller resistor
C. It is equal to the larger resistor only
D. It is the sum of the individual resistances
Answer: D
For series resistors, total resistance is calculated by adding the individual resistance values.
5. Which instrument should normally be connected in parallel when measuring voltage?
A. Ammeter
B. Voltmeter
C. Ohmmeter
D. Wattmeter
Answer: B
A voltmeter measures potential difference between two points and is therefore connected
across, or in parallel with, the portion of the circuit being tested.
6. Before using an ohmmeter on an aircraft circuit, what should the technician do?
A. Increase circuit voltage
B. Energize the circuit fully
C. De-energize the circuit
D. Connect the meter in series with the battery
Answer: C
An ohmmeter contains its own internal source of electrical energy and should be used on a
de-energized circuit to prevent inaccurate readings or meter damage.
7. An aircraft circuit has 12 volts applied and draws 3 amperes. What is its electrical power
consumption?
A. 4 watts
B. 9 watts
C. 15 watts
D. 36 watts
Answer: D
Electrical power is calculated as P = E × I. Therefore, 12 volts × 3 amperes equals 36 watts.
,8. Which condition would most likely cause excessive voltage drop across an aircraft
electrical connection?
A. Low resistance connection
B. Loose or corroded connection
C. Correctly sized conductor
D. Shorter conductor length
Answer: B
A loose or corroded connection can introduce unwanted resistance, producing excessive
voltage drop and possible heating under load.
9. In a parallel circuit, what characteristic is common to all branches?
A. The same voltage is present across each branch
B. The same resistance exists in every branch
C. The same current must flow through every branch
D. Each branch must have identical components
Answer: A
All branches connected across the same two points of a parallel circuit have the same applied
voltage.
10. A technician finds that a motor receives substantially less voltage than the aircraft bus
while operating. What should be investigated first?
A. Paint color on the motor
B. Battery capacity only
C. Voltage drop in the supply circuit
D. Fuel quantity
Answer: C
A significant difference between source and load voltage under operating conditions can
indicate excessive resistance or a poor connection in the supply path.
11. Which material is generally considered a good electrical conductor for aircraft wiring?
A. Copper
B. Rubber
C. Glass
D. Ceramic
Answer: A
, Copper has high electrical conductivity and is widely used for aircraft electrical conductors
because it provides efficient current flow with relatively low resistance.
12. What happens to the resistance of a metallic conductor when its length increases,
assuming other factors remain constant?
A. Resistance decreases
B. Resistance becomes zero
C. Resistance increases
D. Resistance becomes independent of temperature
Answer: C
Resistance is directly proportional to conductor length. A longer conductor provides greater
opposition to current flow.
13. What is the effect of increasing the cross-sectional area of a conductor, all other factors
remaining constant?
A. Resistance increases
B. Resistance decreases
C. Voltage becomes zero
D. Current becomes independent of resistance
Answer: B
A larger conductor cross-sectional area provides more conductive material and therefore
reduces electrical resistance.
14. Which condition is most likely to cause an electrical wire to overheat during normal
operation?
A. Excessive resistance or excessive current
B. Correct wire sizing
C. Proper circuit protection
D. Clean electrical connections
Answer: A
Excessive current or resistance can produce excessive heat, potentially damaging insulation,
connectors, and surrounding aircraft structure.
15. What is the main reason aircraft wiring must be properly supported and secured?
A. To increase circuit voltage
B. To eliminate the need for circuit protection
QUESTIONS AND ANSWERS (VERIFIED ANSWERS) |
EXAM PREP | LATEST EXAM GUIDE 2026&2027
1. Which electrical quantity represents the opposition to current flow in an aircraft circuit?
A. Voltage
B. Resistance
C. Power
D. Capacitance
Answer: B
Resistance is the opposition a circuit presents to current flow. It is measured in ohms and is a
fundamental factor in aircraft electrical troubleshooting.
2. A technician measures 24 volts across a circuit having 6 ohms of resistance. What
current should be expected?
A. 4 amperes
B. 6 amperes
C. 18 amperes
D. 144 amperes
Answer: A
Ohm's law states I = E/R. Dividing 24 volts by 6 ohms gives 4 amperes.
3. What is the primary purpose of a circuit protection device such as a fuse or circuit
breaker?
A. Increase circuit voltage
B. Improve electrical efficiency
C. Prevent excessive current from damaging wiring and components
D. Maintain constant resistance
Answer: C
Circuit protection devices interrupt a circuit when current exceeds a safe value, protecting
conductors and equipment from overheating or damage.
4. Two resistors are connected in series. How does the total resistance compare with either
individual resistor?
,A. It is always lower than both
B. It is equal to the smaller resistor
C. It is equal to the larger resistor only
D. It is the sum of the individual resistances
Answer: D
For series resistors, total resistance is calculated by adding the individual resistance values.
5. Which instrument should normally be connected in parallel when measuring voltage?
A. Ammeter
B. Voltmeter
C. Ohmmeter
D. Wattmeter
Answer: B
A voltmeter measures potential difference between two points and is therefore connected
across, or in parallel with, the portion of the circuit being tested.
6. Before using an ohmmeter on an aircraft circuit, what should the technician do?
A. Increase circuit voltage
B. Energize the circuit fully
C. De-energize the circuit
D. Connect the meter in series with the battery
Answer: C
An ohmmeter contains its own internal source of electrical energy and should be used on a
de-energized circuit to prevent inaccurate readings or meter damage.
7. An aircraft circuit has 12 volts applied and draws 3 amperes. What is its electrical power
consumption?
A. 4 watts
B. 9 watts
C. 15 watts
D. 36 watts
Answer: D
Electrical power is calculated as P = E × I. Therefore, 12 volts × 3 amperes equals 36 watts.
,8. Which condition would most likely cause excessive voltage drop across an aircraft
electrical connection?
A. Low resistance connection
B. Loose or corroded connection
C. Correctly sized conductor
D. Shorter conductor length
Answer: B
A loose or corroded connection can introduce unwanted resistance, producing excessive
voltage drop and possible heating under load.
9. In a parallel circuit, what characteristic is common to all branches?
A. The same voltage is present across each branch
B. The same resistance exists in every branch
C. The same current must flow through every branch
D. Each branch must have identical components
Answer: A
All branches connected across the same two points of a parallel circuit have the same applied
voltage.
10. A technician finds that a motor receives substantially less voltage than the aircraft bus
while operating. What should be investigated first?
A. Paint color on the motor
B. Battery capacity only
C. Voltage drop in the supply circuit
D. Fuel quantity
Answer: C
A significant difference between source and load voltage under operating conditions can
indicate excessive resistance or a poor connection in the supply path.
11. Which material is generally considered a good electrical conductor for aircraft wiring?
A. Copper
B. Rubber
C. Glass
D. Ceramic
Answer: A
, Copper has high electrical conductivity and is widely used for aircraft electrical conductors
because it provides efficient current flow with relatively low resistance.
12. What happens to the resistance of a metallic conductor when its length increases,
assuming other factors remain constant?
A. Resistance decreases
B. Resistance becomes zero
C. Resistance increases
D. Resistance becomes independent of temperature
Answer: C
Resistance is directly proportional to conductor length. A longer conductor provides greater
opposition to current flow.
13. What is the effect of increasing the cross-sectional area of a conductor, all other factors
remaining constant?
A. Resistance increases
B. Resistance decreases
C. Voltage becomes zero
D. Current becomes independent of resistance
Answer: B
A larger conductor cross-sectional area provides more conductive material and therefore
reduces electrical resistance.
14. Which condition is most likely to cause an electrical wire to overheat during normal
operation?
A. Excessive resistance or excessive current
B. Correct wire sizing
C. Proper circuit protection
D. Clean electrical connections
Answer: A
Excessive current or resistance can produce excessive heat, potentially damaging insulation,
connectors, and surrounding aircraft structure.
15. What is the main reason aircraft wiring must be properly supported and secured?
A. To increase circuit voltage
B. To eliminate the need for circuit protection
