51. Which of the following configurations has a voltage gain of –RC /re?
52. An emitter-follower amplifier has an input impedance of 107 k. The input signal is 12 mV. The approximate output voltage is (common-collector)
53. Which of the following is (are) true regarding the output impedance for frequencies in the midrange 100 kHz of a BJT transistor amplifier?
54. Refer to this figure. The output signal from the first stage of this amplifier is 0 V. The trouble could be caused by
55. What is the limit of the efficiency defined by = Po / Pi?
56. What is re equal to in terms of h parameters?
57. What is the controlling current in a common-base configuration?
58. Which of the following techniques can be used in the sinusoidal ac analysis of transistor networks?
59. The input impedance of a BJT amplifier is purely ________ in nature and can vary from a few ________ to ________.
60. The ________ the source resistance and/or ________ the load resistance, the less the overall gain of an amplifier.
61. Refer to this figure. If an emitter bypass capacitor was installed, what would the new Av be?
62. A Darlington pair provides beta ________ for ________ input resistance.
63. A Darlington pair amplifier has
64. In a fixed-bias network, the input signal Vi is applied to the ________ of the transistor while the output Vo is off the ________.
65. In an emitter-follower, the voltage gain is ________.
66. In an unbypassed emitter-bias configuration ________ replaces re in the hybrid equivalent circuit.
67. The feedback pair uses a(n) ________ transistor driving a(n) ________ transistor, the two devices acting effectively much like one pnp transistor.
68. In a hybrid equivalent circuit, ________ is determined to make it easier to find the other parameters.
69. The input and output signals are ________ for the typical transistor amplifier at frequencies that permit ignoring the effects of the reactive elements.
70. ________ is slightly affected if the condition ro 10RE is not satisfied in the analysis of an emitter-follower configuration.
71. The dc load line and ac load line both have the same ________ .
72. The ________ the level of RL, the ________ the level of ac voltage gain.
73. The coupling capacitor places the load and collector resistors in a ________ arrangement.
74. In a voltage-divider bias configuration, the voltage-divider equation is used to determine the ________.
75. The ________ of the input signal is one of the first concerns in the sinusoidal ac analysis of transistor networks.