ASVAB Electronics Practice Test 2 — Questions and Answers
Question 1: What is the unit of electrical capacitance?
- Henry
- Farad (Correct answer)
- Ohm
- Siemens
Correct answer: Farad
Capacitance is measured in Farads (F), named after scientist Michael Faraday.
Question 2: In a series RLC circuit at resonance, the impedance is:
- Maximum
- Equal to the inductive reactance
- Equal to the resistance only (Correct answer)
- Zero
Correct answer: Equal to the resistance only
At resonance in a series RLC circuit, inductive and capacitive reactances cancel, leaving only the resistance.
Question 3: A transformer has 200 primary turns and 50 secondary turns. If the primary voltage is 120V, what is the secondary voltage?
- 480V
- 30V (Correct answer)
- 60V
- 240V
Correct answer: 30V
Using the turns ratio formula: Vs = Vp × (Ns/Np) = 120 × (50/200) = 30V.
Question 4: Which component stores energy in a magnetic field?
- Capacitor
- Resistor
- Inductor (Correct answer)
- Diode
Correct answer: Inductor
An inductor stores energy in a magnetic field when current flows through its coiled wire.
Question 5: What does a forward-biased diode primarily allow?
- Current to flow in both directions
- Current to flow from anode to cathode (Correct answer)
- Current to flow from cathode to anode
- No current to flow
Correct answer: Current to flow from anode to cathode
A forward-biased diode allows conventional current to flow from anode to cathode (positive to negative).
Question 6: The process of converting AC to DC is called:
- Amplification
- Rectification (Correct answer)
- Modulation
- Oscillation
Correct answer: Rectification
Rectification is the process of converting alternating current (AC) to direct current (DC).
Question 7: What is the function of a Zener diode?
- Amplify signals
- Emit light when forward biased
- Regulate voltage in reverse bias (Correct answer)
- Store electrical charge
Correct answer: Regulate voltage in reverse bias
A Zener diode is designed to operate in reverse breakdown to provide a stable reference voltage.
ASVAB Electronics Practice Test 2
What is the unit of electrical capacitance?