Appendix A
Check-on-Learning Answers
CHAPTER 1 (Semiconductor Diodes)
An electronic device that operates when electrons move within a solid piece of semiconductor
1.
material.
The resistance to electrical current flow decreases as temperature increases.
2.
Commercial products, industry, and all branches of the armed services.
3.
Three to four times.
4.
Solid, liquid, and gaseous.
5.
The atom.
6.
Electrons, protons, and neutrons. The electron holds a negative charge, the proton holds a
7.
positive charge, and the neutron holds no electrical charge.
A valence shell.
8.
An atom that has more than its normal amount of electrons and which acquires a negative
9.
charge.
Conduction band and valence band.
10.
The width of the forbidden band or the separation between the conduction and valence bands.
11.
The number of electrons in its valence shell.
12.
Eight.
13.
Covalent bond.
14.
Electron current flow.
15.
To increase the number of free charges that can be moved by an external applied voltage.
16.
When added to a semiconductor material.
17.
Any donor impurity having five valence electrons in its outer shell.
18.
Makes use of the rectifying properties of a PN junction to convert AC into DC by permitting
19.
current flow in only one direction.
One.
20.
Point-contact diode.
21.
N-type material.
22.
Positive holes.
23.
Depletion region.
24.
23 June 2005
TC 9-62
A-1
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