ASVAB Electronics Practice Test 1 3

Question 1

In a series circuit with three resistors of 10Ω, 20Ω, and 30Ω connected to a 12V battery, what is the total current flowing through the circuit?

Accepted Answer

0.2 A

Answer

Total resistance in series = 10 + 20 + 30 = 60Ω. Using Ohm's Law: I = V/R = 12/60 = 0.2 amperes.

Question 2

What is the function of a capacitor in an electronic circuit?

Accepted Answer

Store electrical charge and release it when needed

Answer

A capacitor stores electrical energy in an electric field between two conductive plates separated by an insulating material (dielectric), releasing the stored energy when needed by the circuit.

Question 3

What does 'impedance' mean in an AC circuit?

Accepted Answer

The total opposition to current flow including resistance and reactance

Answer

Impedance is the total opposition to AC current flow, combining both resistance (from resistors, measured in ohms) and reactance (from capacitors and inductors, also in ohms) into a single complex quantity.

Question 4

In digital electronics, what logic operation does a NAND gate perform?

Accepted Answer

It outputs LOW only when ALL inputs are HIGH; otherwise outputs HIGH

Answer

A NAND gate (NOT-AND) outputs LOW only when ALL inputs are simultaneously HIGH. For any other combination (at least one LOW input), it outputs HIGH. It is the inverse of an AND gate.

Question 5

What is the primary difference between a BJT (Bipolar Junction Transistor) and a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor)?

Accepted Answer

BJTs are controlled by base current; MOSFETs are controlled by gate voltage

Answer

A BJT is a current-controlled device where base current controls collector current. A MOSFET is a voltage-controlled device where gate voltage controls drain current — the gate draws essentially no current due to the insulating oxide layer.

ASVAB - Armed Services Vocational Aptitude Battery Practice Test

ASVAB - Armed Services Vocational Aptitude Battery Practice Test

ASVAB Electronics Practice Test 1 3