ASTM NCATT Aircraft Electrical Systems
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. What is the primary purpose of an aircraft electrical power generation
system?
A. Increase fuel flow
B. Provide electrical power to aircraft systems
C. Lubricate engines
D. Cool hydraulic fluid
Answer: B. Provide electrical power to aircraft systems
Explanation: The electrical generation system supplies power to avionics, lighting,
instruments, pumps, and numerous aircraft electrical components.
2. What is the normal source of electrical power after engine start?
A. Battery
B. External power unit
C. Generator or alternator
,D. Inverter
Answer: C. Generator or alternator
Explanation: Once the engine is operating, the generator or alternator supplies
electrical power while recharging the battery.
3. What is the primary function of an aircraft battery?
A. Operate flight controls
B. Provide power during engine start and emergencies
C. Increase generator voltage
D. Regulate frequency
Answer: B. Provide power during engine start and emergencies
Explanation: Batteries provide electrical power before generators are online and
during emergency situations.
4. Which current flows in only one direction?
A. Alternating current
B. Pulsating current
C. Direct current
D. Polyphase current
Answer: C. Direct current
Explanation: Direct current (DC) flows continuously in one direction.
5. Alternating current changes which characteristic periodically?
A. Resistance
B. Temperature
C. Direction of flow
D. Wire size
,Answer: C. Direction of flow
Explanation: AC reverses direction at a specific frequency.
6. Electrical resistance is measured in:
A. Volts
B. Watts
C. Amperes
D. Ohms
Answer: D. Ohms
Explanation: Resistance is measured in ohms and opposes current flow.
7. Electrical current is measured in:
A. Volts
B. Amperes
C. Ohms
D. Hertz
Answer: B. Amperes
Explanation: Current represents the rate of electron flow through a conductor.
8. Voltage is best described as:
A. Power consumption
B. Resistance
C. Electrical pressure
D. Heat
Answer: C. Electrical pressure
Explanation: Voltage provides the force that moves electrons through a circuit.
, 9. Electrical power is measured in:
A. Ohms
B. Volts
C. Amperes
D. Watts
Answer: D. Watts
Explanation: Power equals voltage multiplied by current.
10.Ohm's Law states:
A. Power equals resistance times voltage
B. Voltage equals current multiplied by resistance
C. Current equals voltage times resistance
D. Resistance equals voltage multiplied by power
Answer: B. Voltage equals current multiplied by resistance
Explanation: Ohm's Law is V = I × R.
11.Which instrument measures voltage?
A. Ammeter
B. Ohmmeter
C. Voltmeter
D. Frequency meter
Answer: C. Voltmeter
Explanation: Voltmeters are connected across a circuit to measure electrical
potential.
12.Which instrument measures current?
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. What is the primary purpose of an aircraft electrical power generation
system?
A. Increase fuel flow
B. Provide electrical power to aircraft systems
C. Lubricate engines
D. Cool hydraulic fluid
Answer: B. Provide electrical power to aircraft systems
Explanation: The electrical generation system supplies power to avionics, lighting,
instruments, pumps, and numerous aircraft electrical components.
2. What is the normal source of electrical power after engine start?
A. Battery
B. External power unit
C. Generator or alternator
,D. Inverter
Answer: C. Generator or alternator
Explanation: Once the engine is operating, the generator or alternator supplies
electrical power while recharging the battery.
3. What is the primary function of an aircraft battery?
A. Operate flight controls
B. Provide power during engine start and emergencies
C. Increase generator voltage
D. Regulate frequency
Answer: B. Provide power during engine start and emergencies
Explanation: Batteries provide electrical power before generators are online and
during emergency situations.
4. Which current flows in only one direction?
A. Alternating current
B. Pulsating current
C. Direct current
D. Polyphase current
Answer: C. Direct current
Explanation: Direct current (DC) flows continuously in one direction.
5. Alternating current changes which characteristic periodically?
A. Resistance
B. Temperature
C. Direction of flow
D. Wire size
,Answer: C. Direction of flow
Explanation: AC reverses direction at a specific frequency.
6. Electrical resistance is measured in:
A. Volts
B. Watts
C. Amperes
D. Ohms
Answer: D. Ohms
Explanation: Resistance is measured in ohms and opposes current flow.
7. Electrical current is measured in:
A. Volts
B. Amperes
C. Ohms
D. Hertz
Answer: B. Amperes
Explanation: Current represents the rate of electron flow through a conductor.
8. Voltage is best described as:
A. Power consumption
B. Resistance
C. Electrical pressure
D. Heat
Answer: C. Electrical pressure
Explanation: Voltage provides the force that moves electrons through a circuit.
, 9. Electrical power is measured in:
A. Ohms
B. Volts
C. Amperes
D. Watts
Answer: D. Watts
Explanation: Power equals voltage multiplied by current.
10.Ohm's Law states:
A. Power equals resistance times voltage
B. Voltage equals current multiplied by resistance
C. Current equals voltage times resistance
D. Resistance equals voltage multiplied by power
Answer: B. Voltage equals current multiplied by resistance
Explanation: Ohm's Law is V = I × R.
11.Which instrument measures voltage?
A. Ammeter
B. Ohmmeter
C. Voltmeter
D. Frequency meter
Answer: C. Voltmeter
Explanation: Voltmeters are connected across a circuit to measure electrical
potential.
12.Which instrument measures current?
