ASVAB Study GuideElectronics Information Practice Test 3
Tap an answer to check it instantly and read the explanation. 10 questions: 3 easy, 4 medium and 3 hard.
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Question 1 easy
Which term is used to describe the electrical pressure that forces current through a conductor?
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Correct answer: B — voltage
Voltage, also known as electromotive force (EMF), is the electrical potential difference that causes electric current to flow through a circuit.
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Question 2 easy
What standard unit is commonly used by electric utilities to measure total electrical energy consumed over time?
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Correct answer: C — kilowatt-hour
The kilowatt-hour (kWh) is the standard billing unit of electrical energy, representing 1,000 watts of power consumed over a duration of one hour.
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Question 3 easy
The heat generated in a wire when electric current passes through it is known as which effect of electric current?
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Correct answer: A — heating effect
The heating effect (also called Joule heating or resistance heating) occurs when electric current passes through a conductor and encounters resistance, converting electrical energy into thermal energy.
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Question 4 medium
The process of electroplating, where a metal coating is deposited onto a conductor using electric current in a solution, is an application of which effect?
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Correct answer: D — chemical effect
Electroplating relies on the chemical effect of electric current (electrolysis), where electricity drives chemical reactions in an electrolyte solution to deposit metal.
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Question 5 medium
How do capacitive reactance ($$X_C$$) and inductive reactance ($$X_L$$) respond when the frequency of an AC signal increases?
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Correct answer: B — Capacitive reactance decreases, while inductive reactance increases.
Capacitive reactance ($$X_C = \frac{1}{2\pi fC}$$) is inversely proportional to frequency, so it decreases as frequency rises. Inductive reactance ($$X_L = 2\pi fL$$) is directly proportional, so it increases with frequency.
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Question 6 medium
Which effect of electric current causes a magnetic needle to deflect when placed near a current-carrying wire?
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Correct answer: B — magnetic effect
The magnetic effect of electric current (Oersted's discovery) creates a magnetic field around any wire carrying electricity, which deflects a magnetic needle.
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Question 7 medium
Electric shock causes involuntary muscle contractions and ventricular fibrillation in the human body. This is an example of which effect of electric current?
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Correct answer: D — physiological effect
The physiological effect refers to the impact of electrical current passing through living biological tissues and nerve pathways, inducing muscle contractions or nerve stimulation.
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Question 8 hard
Which semiconductor device features three terminals designated as Gate, Drain, and Source?
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Correct answer: A — a Field-Effect Transistor (FET)
A Field-Effect Transistor (FET) controls current flow using an electric field and has three terminals named Gate, Drain, and Source (unlike BJTs which use Emitter, Base, Collector).
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Question 9 hard
According to Kirchhoff's Current Law (KCL), what is the algebraic sum of all electric currents meeting at any circuit junction?
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Correct answer: C — zero
Kirchhoff's Current Law states that charge is conserved, meaning the total current entering a junction must equal the total current leaving it, making the sum equal to zero.
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Question 10 hard
Which type of transducer converts sound energy into an electrical signal?
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Correct answer: B — microphone
A microphone functions as an input transducer that senses acoustic pressure variations (sound waves) and converts them into corresponding electrical signals.