21
3-34.
In an LC choke-input filter, the larger
the value of the filter capacitor, the
better the filtering action. Which of the
following factors represents the major
limitation in obtaining the maximum
value of the capacitor used?
1. Cost
2. Reliability
3. Availability
4. Physical size
3-35.
What is the most common range of
values selected for a power supply
choke?
1. 1 to 20 henries
2. 5 to 25 henries
3. 25 to 30 henries
4. 10 to 200 henries
3-36.
If the impedance of the choke in an LC
choke-input filter is increased, the
ripple voltage amplitude will
1. decrease
2. increase
3. oscillate
4. remain the same
3-37.
A full-wave rectifier has an output
frequency of 120 hertz, a filter choke
with a value of 10 henries, and a load
resistance of 10 kilohms. What is the
value of XL?
1. 75.0 ohms
2. 7.5 ohms
3. 75.0 kilohms
4. 7.5 kilohms
3-38.
The filter capacitor in the LC choke-
input filter is NOT subject to extreme
voltage surges because of the protection
provided by which of the following
components?
1. Inductor
2. Load resistor
3. Series resistor
4. Shunt capacitor
3-39.
Shorted turns in the choke of an LC
choke-input filter may reduce the value
of inductance below the critical value.
When this happens, which of the
following problems may occur?
1. Poor voltage regulation
2. Excessive ripple amplitude
3. Abnormally high output voltage
4. Each of the above
3-40.
The use of the RC capacitor-input filter
is limited to which of the following
situations?
1. When the load current is large
2. When the load current is small
3. When the load voltage is large
4. When the load voltage is small
Figure 3C.
RC Capacitor-input filter.
IN ANSWERING QUESTIONS 3-41 AND
3-42, REFER TO FIGURE 3C.
3-41.
Which of the following components
will have the highest failure rate?
1. C1
2. C2
3. R1
4. RL
3-42.
Which of the following components
provides protection against voltage
surges in the circuit?
1. C1
2. C2
3. R1
4. RL
