ASVAB Electronics Practice Test 4 — Questions and Answers
Question 1: In a parallel circuit with two equal resistors of 10Ω each, the total resistance is:
- 20Ω
- 10Ω
- 5Ω (Correct answer)
- 2.5Ω
Correct answer: 5Ω
For two equal resistors in parallel, total resistance = R/2 = 10Ω/2 = 5Ω.
Question 2: What does the 'Q' factor represent in an LC circuit?
- The quality or sharpness of resonance (Correct answer)
- The charge stored in the capacitor
- The total current flowing
- The power dissipated
Correct answer: The quality or sharpness of resonance
The Q (quality) factor describes how sharp or selective a resonant circuit's frequency response is.
Question 3: Semiconductors have conductivity that falls between:
- Conductors and superconductors
- Insulators and conductors (Correct answer)
- Magnets and insulators
- Resistors and capacitors
Correct answer: Insulators and conductors
Semiconductors have electrical conductivity between that of a conductor and an insulator, making them useful for controlling current.
Question 4: What happens to the resistance of a conductor as its temperature increases?
- It decreases
- It stays the same
- It increases (Correct answer)
- It becomes zero
Correct answer: It increases
For most conductors, resistance increases with temperature due to increased atomic vibration impeding electron flow.
Question 5: Which of the following is an example of an active electronic component?
- Resistor
- Capacitor
- Transistor (Correct answer)
- Inductor
Correct answer: Transistor
A transistor is an active component because it can amplify or switch signals and requires a power source.
Question 6: A 100W light bulb operating at 120V draws how much current?
- 1.2A
- 0.83A (Correct answer)
- 12A
- 8.3A
Correct answer: 0.83A
Using P = V × I, rearranged: I = P/V = 100W / 120V ≈ 0.83A.
Question 7: Which type of coupling uses a capacitor to pass AC signals while blocking DC between amplifier stages?
- Direct coupling
- Transformer coupling
- Capacitive coupling (Correct answer)
- Inductive coupling
Correct answer: Capacitive coupling
Capacitive (RC) coupling uses capacitors to pass AC signals while blocking the DC bias between stages.
ASVAB Electronics Practice Test 4
In a parallel circuit with two equal resistors of 10Ω each, the total resistance is: