Diodes & Transistors
Question 1
Copper is a good conductor.
True
False
Question 2
Doping is a process of adding impurity atoms to an intrinsic crystal to alter its electrical conductivity.
True
False
Question 3
You can quickly check the condition of a diode with an ohmmeter on a high resistance range.
True
False
Question 4
The letter Q is an abbreviation for quiescent, which represents the AC signal is operating between cut-off and saturation points of the
transistor.
True
False
Question 5
The half-wave rectifier has a diode in parallel with a load resistor.
True
False
Question 6
In an NPN transistor, the emitter and collector are both n-type materials.
True
False
Question 7
The dc beta is also known as the current gain because a small base current controls a much larger collector current.
True
False
Question 8
The load line is a visual summary of all the possible transistor operating points.
True
False
Question 9
With the switch in the position as shown in Figure 1 below, the LED is on.
True
False
Question 10
A transistor can be tested using an ohmmeter to check back and front resistances of emitter-base, collector-base, and collector-emitter.
True
False
Question 11
Hard saturation refers to any design that makes the saturation current gain approximately:
1
10
100
1000
Question 12
While testing a transistor with an ohmmeter, a high reverse/forward resistance ratio for the emitter-base and base-collector junctions indicates
this transistor is good.
this transistor is open and should be replaced.
this transistor is shorted and should be replaced.
this transistor is a small-signal amplifier.
Question 13
A major advantage of an optocoupler is the:
electrical isolation between input and output circuits.
electrical connection between input and output circuits.
higher gain.
low cost of manufacturing the device.
Question 14
With normal circuit operation, Vout in Figure 2 is ________.
figure 2
Figure 2
Approximately 0V
115 Vac
20 V
10 V DC
Question 15
If the 115 V ac is removed from the circuit shown in Figure 2, what would be measured at Vout?
figure 2
Figure 2
approximately 0 V
115 V
20 V
10 V
Question 16
What type transistor connection is shown in Figure 3 below?
common emitter
common collector
common base
emitter follower
Question 17
What is the device that increases a transistor's power rating by reducing the internal heat faster?
heater wire
chassis
grommet
heat sink
Question 18
Another name for diode offset voltage is:
barrier potential
ripple voltage
surge voltage
filtered voltage
Question 19
The second approximation of a silicon diode is basically the:
the diode appears as a switch in series with a barrier potential of 0.7 V
the diode appears as a switch in parallel with a barrier potential of 0.7 V
the diode appears as a barrier potential of 0.4 V
the diode appears as a short circuit
Question 20
What is the most popular and useful semiconductor material?
silver
Copper
Aluminum
Silicon
Question 21
What is the Peak secondary voltage?
What is the peak-to-peak voltage at the filter point considering non-ideal diode?
Question 22
For the CE circuit shown in Figure 5 below, draw the dc load line and mark the dc working point on it. Assume Beta=100 and neglect
VBE.