ELECTRONICS CHAPTER 2 5

How many valence electrons are in every semiconductor material?

• 1

• 2

• 3

• 4

The element/device used as a comparator in most voltage regulators.

• Zener diode

• BJT

• IGBT

• Op-amp

The reverse saturation current Is will just ______ in magnitude for every 10°C increase in temperature.

• double

• remain the same

• halve

• triple

In a metal conductor, such as a copper wire

• Positive ions are the following charges that provide current

• Free electrons are the moving charges that provide current

• There are no free electrons

• None of these

Minority carriers are many times activated by:

• heat

• pressure

• dopants

• forward bias

For the 'off' state of a Zener diode, the voltage across the diode should be ________

• greater than Vz

• zero

• less than Vz but greater than zero

• None of the above

How many valence electrons does a silicon atom have?

• 1

• 2

• 3

• 4

As the load resistor increases, the slope of the de load line and the levels of diode current ________.

• increase

• decrease

• remain unchanged

• are unpredictable

Zener diodes are used in regulator networks to ________.

• generate voltage

• consume power

• maintain a fixed voltage across the load resistor

• protect the load

If conductance increases as temperature increases, this is known as a:

• positive coefficient

• negative current flow

• negative coefficient

• positive resistance