Questions 1 to 20: Select the best answer to each question. Note that a question and its answers may be split across a page break, so be sure that you have seen the entire question and all the answers before choosing an answer.
1. A line filter would be used to remove
A. pulsating DC voltages from a rectifier.
B. line frequencies from an alternator.
C. low frequencies from an AC line signal.
D. high-frequency noise spikes from an AC line signal.
2. Which of the following components has the same amount of opposition to current flow at all frequencies?
A. Transformer
B. Inductor
C. Resistor
D. Capacitor
3. Which of the following is a disadvantage of the waveguide as compared to a transmission line?
A. Waveguides are more difficult to install.
B. Waveguides leak signal into the air.
C. Waveguides can't be used at any of the higher frequencies.
D. Waveguides can only be used in low-power applications.
4. In the formula that's used to calculate the constant-M for a high-pass filter, fe stands for the
A. counter impedance.
B. cutoff frequency.
C. filter capacitance.
D. resonant frequency.
5. For any filter, the more selective the filter is, the closer its shape factor will be to a value of
A. 1.
B. 0.
C. 100.
D. 2.
6. For a particular filter, the multiplication of the series impedance and the shunt impedance produces a fixed value over the range of frequencies for which the circuit is designed. This type of filter is the
A. M-derived filter.
B. line filter.
C. constant-K filter.
D. crystal filter.
7. Which of the following is a disadvantage of using a resistor in place of an inductor in a power-supply filter?
A. A resistor weighs much more than an inductor.
B. The life of the capacitors will be shorter.
C. A resistor will cost much more than an inductor.
D. The output DC voltage will be lower.
8. A filter that always contains at least one tuned LC circuit that's either in series with or across the signal line is the
A. high-pass filter.
B. low-pass filter.
C. M-derived filter.
D. constant-K filter.
9. Which of the following components passes low frequencies but offers high reactance to high frequencies?
A. Capacitor
B. Resistor
C. Switch
D. Inductor
10. To remove pulsations from a power-supply output, you could use a
A. band-reject filter.
B. low-pass filter.
C. high-pass filter.
D. band-pass filter.
11. Richard says "a band-pass filter can be made with a series-tuned LC-circuit." Pam says "a band-pass filter can be made with a parallel-tuned LC-circuit." Who is correct?
A. Both Richard and Pam are correct
B. Neither Richard or Pam is correct
C. Pam is correct
D. Richard is correct
12. You have a tuned circuit with a resonant frequency of 3.7 MHz and a quality factor (Q) of 250. The bandwidth of this circuit is approximately
A. 148 kHz.
B. 14.8 kHz.
C. 1,480 kHz.
D. 1.48 kHz.
13. For a band-pass filter, the range of frequencies between the points on a characteristic curve that are about 70 percent of the maximum value is called the
A. resonance.
B. Q factor.
C. bandwidth.
D. cutoff frequency.
14. Which of the following is a correct variation of the Joule's law equation?
A. P = V/I
B. P = V2/R
C. P = I x R2
D. P = I2/V
15. Which of the following conditions would be necessary in order for you to use an r-f transformer as a very sharply tuned band-pass device?
A. The primary and secondary windings should be overcoupled.
B. A capacitor should be connected between the primary and secondary windings.
C. A series-tuned LC circuit must be connected across the secondary winding.
D. The primary and secondary windings must be shielded from each other.
16. Another name for the capacitive-input power-supply filter is the
A. T filter.
B. r-f filter.
C. pi filter.
D. wave trap filter.
17. Which of the following components offers less opposition to high frequencies than to low frequencies?
A. Capacitors
B. Inductors
C. Resistors
D. Diodes
18. What would be the purpose of connecting a parallel-tuned circuit into an antenna circuit?
A. To increase the signal strength
B. To increase the antenna impedance
C. To remove an unwanted frequency
D. To remove undesired spikes on the signal
19. In a characteristic curve for an overcoupled r-f filter, the steep sides of the curve are called the
A. windings
B. skirts.
C. brackets.
D. bandwidths.
20. What is the conjugate impedance for 5 ∠ -20o?
A. 200 ∠ 0°
B. -5 ∠ 20°
C. 25 ∠ 20°
D. 5 ∠ 20°