Solid-State Electronics
Practice Test
1.
Why are dopants added to intrisinc semiconductor materials?
a.
to make semiconductors electrically neutral
b.
to increase resistance
c.
to increase conductivity
d.
to increase the forbidden gap
Hint
2.
A
p
-type semiconductor conducts electricity with __________.
a.
electrons
b.
neutrons
c.
holes
d.
protons
Hint
3.
If the diode connected to ammeter A
2
in Figure 29-22 were reversed, what would happen to A
1
's reading?
a.
It would remain unchanged.
b.
It would read zero.
c.
It would increase.
d.
It would decrease to a non-zero value.
Hint
4.
In Figure 29-20, what resistor should be used to increase the current to 25 mA? Assume that the potential drop across the LED is still 1.2 V.
a.
120 Ω
b.
300 Ω
c.
240 Ω
d.
192 Ω
Hint
