AET Electrical Fundamentals 2 — Questions and Answers
Question 1: What does EMF stand for in electrical systems?
- Electronic Magnetic Force
- Electromotive Force (Correct answer)
- Electromagnetic Frequency
- Electrical Modulation Factor
Correct answer: Electromotive Force
EMF stands for Electromotive Force, which is the energy per unit charge supplied by a source such as a battery.
Question 2: A capacitor in an AC circuit acts primarily as which of the following?
- Resistor
- Inductor
- Reactance element blocking DC (Correct answer)
- Short circuit
Correct answer: Reactance element blocking DC
A capacitor blocks DC and presents capacitive reactance to AC signals, allowing AC to pass while blocking DC.
Question 3: Which instrument is used to measure current flow in an aircraft circuit?
- Voltmeter
- Ammeter (Correct answer)
- Ohmmeter
- Wattmeter
Correct answer: Ammeter
An ammeter measures the flow of electric current in amperes and must be connected in series with the circuit.
Question 4: What is the purpose of a bus bar in an aircraft electrical system?
- To amplify voltage
- To distribute power to multiple circuits (Correct answer)
- To convert AC to DC
- To measure resistance
Correct answer: To distribute power to multiple circuits
A bus bar serves as a common distribution point that supplies power from the main source to multiple branch circuits.
Question 5: What is the typical aircraft standard DC bus voltage in most general aviation aircraft?
- 12V
- 24V
- 28V (Correct answer)
- 115V
Correct answer: 28V
Most aircraft use a 28V DC system, which provides adequate power while keeping wire weight practical.
Question 6: Which component prevents excessive current from damaging aircraft wiring?
- Diode
- Relay
- Circuit breaker (Correct answer)
- Capacitor
Correct answer: Circuit breaker
Circuit breakers protect aircraft wiring by opening the circuit when current exceeds a safe rated value.
AET Electrical Fundamentals 2
What does EMF stand for in electrical systems?