ASVAB Electronics Practice Test 2

Question 1

What is the frequency of Direct Current (DC)?

Accepted Answer

0 Hz

Answer

Direct Current (DC) is an electric current that flows in only one direction, maintaining a constant polarity. Unlike Alternating Current (AC), DC does not periodically reverse its direction or magnitude in a cyclical pattern. Therefore, it has no cycles per second, meaning its frequency is 0 Hz.

Question 2

What does the following image represent?

Accepted Answer

Ground

Answer

The image (three horizontal lines decreasing in length, often connected to a circuit) is the standard electrical symbol for 'Ground'. This symbol represents a common reference point in an electrical circuit, typically considered to be at zero potential, and often connected to the earth or a chassis for safety and stability.

Question 3

An ideal fuse should have a:

Accepted Answer

Low melting point and a high current rating.

Answer

An ideal fuse is designed to protect a circuit by melting and breaking the connection when current exceeds a safe limit. It must have a low melting point to react quickly to overcurrent conditions. While the term 'high current rating' can be ambiguous, in this context, it implies the fuse material can efficiently carry its rated current without degradation, yet still blow quickly due to its low melting point when that rating is exceeded.

Question 4

A fuse rated at 0.8 A blows when the switch is closed. If an 80 V supply is supplying power to the circuit, what would be the maximum possible value of the resistance for which the current flows through the circuit?

Accepted Answer

100 ohms

Answer

Ohm's Law states that V = I * R, where V is voltage, I is current, and R is resistance. To find the maximum resistance for which current flows without blowing the fuse, we use the fuse's maximum current rating. Rearranging Ohm's Law, R = V / I. Plugging in the values, R = 80 V / 0.8 A = 100 ohms. If the resistance were lower than 100 ohms, the current would exceed 0.8 A, causing the fuse to blow.

Question 5

A capacitor stores energy in the form of:

Accepted Answer

Electric Field

Answer

A capacitor consists of two conductive plates separated by a dielectric (insulating) material. When a voltage is applied across the plates, electric charge accumulates on them, creating an electric field in the dielectric material between the plates. The energy stored in a capacitor is held within this electric field.

ASVAB - Armed Services Vocational Aptitude Battery Practice Test

ASVAB - Armed Services Vocational Aptitude Battery Practice Test

ASVAB Electronics Practice Test 2