1. True/False Selections (3-pt each, 30 pt):

a. ____ Intrinsic semiconductors contains other types of atoms and is called impurity atoms.

b. ____ The semiconductor including acceptor impurity atoms is called extrinsic semiconductor.

c. ____ The semiconductor including acceptor impurity atoms is called n-type semiconductor.

d. ____ A solar cell is a kind of diode that does not need any power and it provides current output.

e. ____ When a diode is forward-biased, the current-voltage relationship is an exponential function.

f. ____ A breakdown occurs when the reverse-biased voltage applied on a Zener diode is greater

than the breakdown voltage, and the voltage is relatively stable compared with the current.

g. ____ Four popular methods used to analyze diode circuits are: iteration, graphical, piecewise

linear and computer simulation methods.

h. ____ Valence electronics are those electronics located and rotated at the outermost orbit around

nucleus.

i. ____ Materials contained less electronics are called conductors.

j. ____ Two kinds of current are existed in a p-n junction: drift and diffusion current.

2. Multiple choices (4-pt each, 40 pt):

1. The intrinsic semiconductor is a kind of semiconductor that contains __________

a. Only purity atoms

b. Donor impurity atoms

c. Acceptor impurity atoms

d. Any other types of atoms

2. The difference between the conductors and insulators is dependent on ________

a. The amount of impurity atoms they contained

b. The amount of donor impurity atoms they contained

c. The amount of acceptor impurity atoms they contained

d. The amount of electrons they contained

3. A n-type semiconductor is a semiconductor that is composed of __________

a. The purity atoms

b. The donor impurity atoms

c. The acceptor impurity atoms

d. The electrons

4. A p-n junction is called forward-biased when the external electrical field is applied _____

a. With positive terminal connected to the n-region and negative terminal to p-region

b. With positive terminal connected to the p-region and negative terminal to n-region

c. With negative terminal connected to the p-region and positive terminal to n-region

d. None of them

5. The current is called the drift current when a p-n junction ___________

a. Is applied with an external electrical field

b. Has the non-homogeneous doping distributions

c. Has a variation in the concentrations or density of carriers

d. Contains too much carriers

6. The diode analysis is to analyze the diodes current-voltage relationship with ___ methods, and they are: ____________________________________ methods

a. 3, data analysis, iteration and piecewise linear

b. 4, graphical, iteration, piecewise linear and data analysis

c. 4, iteration, graphical, piecewise linear and computer simulation

d. 4, iteration, piecewise linear, computer simulation and bias point analysis

7. The solar cell is a kind of diode that does ___________

a. Need the power supply when it is applied in the circuit

b. Not need the power supply when it is applied in the circuit

c. Convert the solar energy to the electrical energy and provides the power for the circuit

d. Nothing when it is connected to a circuit

8. The Zener diode can be used to stabilize __________

a. The current output only

b. Both voltage and current output

c. The voltage output only

d. The resistance output only

9. The half-wave rectifier allows only ________ waveform to pass through the diode and get only the _______ half-wave in the output

a. Full, positive

b. Half, negative

c. Half, positive

d. Full, negative

10. The output voltage of a half-wave and a bridge full-wave rectifier is ________ and ________

a. VS 2Vr, VS - Vr

b. Vr 2VS, VS - Vr

c. VS Vr, Vr - VS

d. VS Vr, VS 2Vr

3. Explain and answer the following questions (10 pt):

a. The Intrinsic Semiconductors and Extrinsic Semiconductors (5-pt)

b. The n-type Semiconductors and the p-type Semiconductors (5-pt)