SEMICONDUCTORS

Effectively, how many valence electrons are there in each atom within a silicon crystal?

• 1

• 2

• 4

• 8

The boundary between p-type material and n-type material is called

• A diode

• A reverse-biased diode

• Pn junction

• A forward-biased diode

When the reverse voltage increases from 5 to 10 V, the depletion later

• Becomes smaller

• Becomes larger

• Is unaffected

• Breaks down

What kind of a device is a diode?

• Bilateral

• Linear

• Nonlinear

• Unipolar

The ideal diode is usually adequate when

• Troubleshooting

• Doing precise calculations

• The source voltage is low

• The load resistance is low

The dc current through each diode in a bridge rectifier equals:

• the load current

• half the dc load current

• twice the dc load current

• one-fourth the dc load current

When matching polarity connections have been made and the potential difference (PD) is above 0.7 V, the diode is considered to be:

• not working

• forward biased

• reverse biased

• an open switch

In a power supply diagram, which block indicates a smooth dc output?

• transformer

• filter

• rectifier

• regulator

A filtered full-wave rectifier voltage has a smaller ripple than does a half-wave rectifier voltage for the same load resistance and capacitor values because:

• there is a shorter time between peaks

• there is a longer time between peaks

• the larger the ripple, the better the filtering action

• none of the above

Testing a good diode with an ohmmeter should indicate

• high resistance when forward or reverse biased

• low resistance when forward or reverse biased

• high resistance when reverse biased and low resistance when forward biased

• high resistance when forward biased and low resistance when reverse biased