7
1-54. What is the effect on the gain of an
amplifier if the output-signal-developing
impedance is increased?
1. It decreases
2. It increases
3. It remains the same
4. It cannot be determined
1-55. What is/are the purpose(s) of a
frequency-determining network in an rf
amplifier?
1. To create a large bandpass
2. To compensate for low-frequency
losses
3. To provide maximum impedance at a
given frequency
4. All of the above
1-56. Of the following networks, which could
be used as a frequency-determining
network for an rf amplifier?
1. A parallel-resistor network
2. A series-resistor network
3. A parallel RC network
4. A parallel LC network
1-57. Which of the following methods may be
used to tune an LRC frequency-
determining network to a different
frequency?
1. Vary the capacitance
2. Vary the inductance
3. Both 1 and 2 above
4. Vary the resistance
1-58. What is the most common form of
coupling for an rf amplifier?
1. RC
2. Resistor
3. Impedance
4. Transformer
1-59. Which of the following advantages are
provided by transformer coupling?
1. Simpler power supplies can be used
2. The circuit is not affected by
frequency
3. Low-frequency response is improved
4. Fewer parts are used
1-60. If a current gain is desired, which of the
following elements/networks should be
used as an output-coupling device?
1. An RC network
2. A resistive network
3. A step-up transformer
4. A step-down transformer
1-61. Which of the following techniques would
cause a too-narrow bandpass in an rf
amplifier?
1. An overcoupled transformer
2. A loosely coupled transformer
3. The use of a swamping resistor
4. The use of a frequency-determining
network
1-62. Which of the following techniques would
cause low gain at the center frequency of
an rf amplifier?
1. An overcoupled transformer
2. A loosely coupled transformer
3. The use of a swamping resistor
4. The use of a frequency-determining
network
1-63. What type of transformer coupling
should be used in an rf amplifier?
1. Ideal
2. Loose
3. Optimum
4. Overcoupling
