ASVAB Electronics Practice Test 3 — Questions and Answers
Question 1: Which type of transistor is controlled by voltage at the gate terminal?
- BJT (Bipolar Junction Transistor)
- PNP Transistor
- FET (Field Effect Transistor) (Correct answer)
- NPN Transistor
Correct answer: FET (Field Effect Transistor)
FETs (Field Effect Transistors) are voltage-controlled devices that use a gate to control current flow.
Question 2: If a circuit has a 9V battery and a 3Ω resistor, what is the current?
- 27A
- 0.33A
- 3A (Correct answer)
- 6A
Correct answer: 3A
Using Ohm's Law: I = V/R = 9V / 3Ω = 3A.
Question 3: What does AM stand for in radio communication?
- Amplitude Modulation (Correct answer)
- Antenna Management
- Audio Mode
- Alternating Measurement
Correct answer: Amplitude Modulation
AM stands for Amplitude Modulation, where the carrier wave's amplitude is varied to encode information.
Question 4: The color code for a resistor with bands Orange, Orange, Red is:
- 3,300 Ω (Correct answer)
- 33 Ω
- 330 Ω
- 33,000 Ω
Correct answer: 3,300 Ω
Orange=3, Orange=3, Red=×100 multiplier, giving 33 × 100 = 3,300 Ω.
Question 5: What is the purpose of a capacitor in a DC power supply filter?
- Increase voltage output
- Amplify the ripple voltage
- Smooth out voltage ripple (Correct answer)
- Convert AC to DC
Correct answer: Smooth out voltage ripple
A filter capacitor charges during voltage peaks and discharges during valleys, smoothing out ripple in DC output.
Question 6: Which gate produces a HIGH output only when ALL inputs are HIGH?
- OR gate
- NAND gate
- AND gate (Correct answer)
- NOR gate
Correct answer: AND gate
An AND gate outputs HIGH only when all of its inputs are simultaneously HIGH.
Question 7: Frequency is measured in which unit?
- Watts
- Hertz (Correct answer)
- Volts
- Amperes
Correct answer: Hertz
Frequency, the number of cycles per second, is measured in Hertz (Hz), named after Heinrich Hertz.
ASVAB Electronics Practice Test 3
Which type of transistor is controlled by voltage at the gate terminal?