BJT GROB Flashcards
1
Q
- Which transistor region is very thin
and lightly doped?
a. the emitter region.
b. the collector region.
c. the anode region.
d. the base region.
A
d. the base region.
2
Q
- Which region in a transistor is the
most heavily doped?
a. the emitter region.
b. the collector region.
c. the gate region.
d. the base region.
A
a. the emitter region.
3
Q
- In a transistor, which is the largest of
all the doped regions?
a. the emitter region.
b. the collector region.
c. the gate region.
d. the base region.
A
b. the collector region.
4
Q
- For a transistor to function as an
amplifi er,
a. both the EB and CB junctions
must be forward-biased.
b. both the EB and CB junctions
must be reverse-biased.
c. the EB junction must be forward-
biased and the CB junction must be reverse-biased.
d. the CB junction must be forward-
biased and the EB junction must be reverse-biased.
A
c. the EB junction must be forward-
biased and the CB junction must be reverse-biased.
5
Q
- For a typical transistor, which
two currents are nearly the
same?
a. IB and IE.
b. IB and IC.
c. IC and IE.
d. none of the above.
A
c. IC and IE.
6
Q
- In what operating region does the
collector of a transistor act like a
current source?
a. the active region.
b. the saturation region.
c. the cutoff region.
d. the breakdown region.
A
a. the active region.
7
Q
- A transistor operating in the active
region has a base current, IB, of
20 microA. If bDC = 250, how much is
the collector current, IC?
a. 50 mA.
b. 5 mA.
c. 12.5 mA.
d. 80 A.
A
b. 5 mA.
8
Q
- Which of the following biasing
techniques produces the most
unstable Q point?
a. voltage divider bias.
b. emitter bias.
c. collector bias.
d. base bias.
A
d. base bias.
9
Q
- When the collector current in a
transistor is zero, the transistor is
a. cut off .
b. saturated.
c. operating in the breakdown region.
d. either b or c.
A
a. cut off .
10
Q
- When a transistor is in saturation,
a. VCE = VCC.
b. IC = 0 A.
c. VCE = 0 V.
d. VCE = 1⁄2VCC.
A
c. VCE = 0 V.
11
Q
- Emitter bias with two power supplies
provides a
a. very unstable Q point.
b. very stable Q point.
c. large base voltage.
d. none of the above.
A
b. very stable Q point.
12
Q
- The aDC of a transistor equals
a. IC/IE.
b. IB/IC.
c. IE/IC.
d. IC/IB.
A
a. IC/IE
13
Q
- For a transistor operating in the
active region,
a. IC = BDC x IB.
b. VCC has little or no effect on the value of IC.
c. IC is controlled solely by VCC.
d. both a and b.
A
d. both a and b.
14
Q
- In a transistor amplifi er, what
happens to the collector voltage,
VC, when the collector current, IC,
increases?
a. VC increases.
b. VC stays the same.
c. VC decreases.
d. It cannot be determined.
A
c. VC decreases.
15
Q
- With voltage divider bias, how much is
the collector-emitter voltage, VCE,
when the transistor is cut off ?
a. VCE = 1⁄2 VCC.
b. VCE = VCC.
c. VCE = 0 V.
d. none of the above.
A
b. VCE = VCC.
16
Q
- On the schematic symbol of a pnp
transistor,
a. the arrow points out on the
emitter lead.
b. the arrow points out on the
collector lead.
c. the arrow points in on the base lead.
d. the arrow points in on the emitter lead
A
d. the arrow points in on the emitter lead
17
Q
- What is the bDC of a transistor whose
aDC is 0.996?
a. 249.
b. 100.
c. approximately 1.
d. It cannot be determined.
A
a. 249.
18
Q
- In a transistor, which current is the
largest?
a. IC.
b. IB.
c. IE.
d. ID.
A
c. IE.
19
Q
- A bipolar junction transistor has
a. only one p-n junction.
b. three p-n junctions.
c. no p-n junctions.
d. two p-n junctions.
A
d. two p-n junctions.
20
Q
- The endpoints of a DC load line are
labeled
a. ICQ and VCEQ.
b. IC(sat) and VCE(off ).
c. IC(off ) and VCE(sat).
d. none of the above.
A
b. IC(sat) and VCE(off ).
