ASVAB Electronics 5

Question 1

Which semiconductor device can be used to amplify a signal using three terminals: gate, source, and drain?

Accepted Answer

MOSFET

Answer

A MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) uses gate, source, and drain terminals and controls current via an electric field.

Question 2

In a full-wave bridge rectifier, how many diodes are required?

Accepted Answer

4

Answer

A bridge rectifier uses 4 diodes arranged in a bridge configuration to convert both half-cycles of AC into DC.

Question 3

What does the term 'gain' mean in the context of an amplifier?

Accepted Answer

The ratio of output signal amplitude to input signal amplitude

Answer

Gain is the ratio of output to input (voltage, current, or power), indicating how much the amplifier increases the signal.

Question 4

A fuse is rated at 5 amps. If the circuit draws 7 amps, what will happen?

Accepted Answer

The fuse will blow, opening the circuit

Answer

When current exceeds the fuse rating, the fuse element melts and opens the circuit, protecting the wiring and components.

Question 5

What is the function of an oscilloscope in electronics testing?

Accepted Answer

To display voltage waveforms as a function of time

Answer

An oscilloscope displays voltage versus time on a screen, allowing technicians to visualize signal shape, frequency, and amplitude.

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