ASVAB Electronics Practice Test 5 — Questions and Answers
Question 1: What is the primary purpose of a voltage divider circuit?
- Increase input voltage
- Produce a fraction of the input voltage (Correct answer)
- Convert AC to DC
- Amplify current
Correct answer: Produce a fraction of the input voltage
A voltage divider uses two resistors in series to produce an output voltage that is a fraction of the input voltage.
Question 2: In digital electronics, a flip-flop is used to:
- Convert analog to digital
- Store a single binary bit (Correct answer)
- Amplify digital signals
- Generate clock pulses
Correct answer: Store a single binary bit
A flip-flop is a bistable circuit that stores one bit of binary information (either 0 or 1).
Question 3: What does the term 'impedance' refer to in AC circuits?
- Only resistance to DC current
- Total opposition to AC current flow including reactance (Correct answer)
- The capacitance in the circuit
- The inductance value alone
Correct answer: Total opposition to AC current flow including reactance
Impedance (Z) is the total opposition to AC current, combining resistance and reactance (inductive and capacitive).
Question 4: Which instrument is used to measure electrical power in a circuit?
- Voltmeter
- Ammeter
- Wattmeter (Correct answer)
- Ohmmeter
Correct answer: Wattmeter
A wattmeter measures electrical power (in watts) consumed by a circuit or component.
Question 5: What type of filter allows only frequencies above its cutoff frequency to pass?
- Low-pass filter
- Band-pass filter
- High-pass filter (Correct answer)
- Notch filter
Correct answer: High-pass filter
A high-pass filter attenuates frequencies below the cutoff and passes frequencies above it.
Question 6: Ground fault circuit interrupters (GFCIs) protect against:
- Voltage surges
- Electrical shock from current leakage to ground (Correct answer)
- Power outages
- Short circuits in appliances
Correct answer: Electrical shock from current leakage to ground
GFCIs monitor current imbalance between hot and neutral wires and trip when even a small leakage current to ground is detected.
Question 7: Which oscillator type uses an LC tank circuit to determine its frequency?
- Crystal oscillator
- RC phase-shift oscillator
- Hartley oscillator (Correct answer)
- Wien bridge oscillator
Correct answer: Hartley oscillator
The Hartley oscillator uses a tapped inductor in an LC tank circuit to set its oscillation frequency.
ASVAB Electronics Practice Test 5
What is the primary purpose of a voltage divider circuit?