ASVAB Electronics Information Test 3 — Questions and Answers
Question 1: What is the primary purpose of a fuse in an electrical circuit?
- Increase current flow
- Regulate voltage
- Protect against overcurrent (Correct answer)
- Store energy
Correct answer: Protect against overcurrent
A fuse melts and opens the circuit when current exceeds a safe level, protecting components.
Question 2: If a circuit has 12V across a 4-ohm resistor, how much power is dissipated?
- 3 watts
- 48 watts
- 36 watts (Correct answer)
- 8 watts
Correct answer: 36 watts
P = V²/R = 12²/4 = 144/4 = 36 watts.
Question 3: What does the term 'frequency' refer to in AC circuits?
- The peak voltage value
- The number of complete cycles per second (Correct answer)
- The time for one cycle
- The phase difference between voltage and current
Correct answer: The number of complete cycles per second
Frequency is measured in hertz (Hz) and indicates how many complete cycles occur each second.
Question 4: What type of circuit has only one path for current to flow?
- Parallel circuit
- Bridge circuit
- Series circuit (Correct answer)
- Complex circuit
Correct answer: Series circuit
In a series circuit, all components share the same single current path.
Question 5: What is the function of an inductor in an AC circuit?
- Blocks DC and passes AC
- Opposes changes in current (Correct answer)
- Converts AC to DC
- Amplifies voltage
Correct answer: Opposes changes in current
An inductor opposes changes in current due to its self-induced back-EMF (inductive reactance).
Question 6: Which material is considered a semiconductor?
- Copper
- Silicon (Correct answer)
- Rubber
- Silver
Correct answer: Silicon
Silicon is a classic semiconductor used in transistors, diodes, and integrated circuits.
Question 7: In electrical wiring, what does AWG stand for?
- Alternating Wire Gauge
- American Wire Gauge (Correct answer)
- Ampere Wire Grade
- Applied Wiring Guide
Correct answer: American Wire Gauge
AWG stands for American Wire Gauge, a standardized system for wire diameter sizes.
ASVAB Electronics Information Test 3
What is the primary purpose of a fuse in an electrical circuit?