Practice Test (See related pages) 1 The biasing of a transistor deals specifically with dc voltages and currents. A) True B) False 2 The input signal applied to a linear amplifier should not be so large that it shifts the instantaneous operating point to either saturation or cutoff. A) True B) False 3 When analyzing a common-emitter amplifier, it is common practice to represent the emitter diode as a large resistance. A) True B) False 4 An emitter bypass capacitor provides a low-impedance path for ac signals between the emitter terminal and ground. A) True B) False 5 The ratio of ac collector current to ac base current is called the ac beta. A) True B) False 6 The common-collector amplifier is the only transistor amplifier configuration that produces a 180° phase shift between vin and vout. A) True B) False 7 Adding a swamping resistor to the emitter circuit reduces distortion considerably. A) True B) False 8 The output impedance of a CE amplifier equals the value of the collector resistor, and also includes the load resistor. A) True B) False 9 The common-collector amplifier does not provide current gain or power gain. A) True B) False 10 The output of an emitter follower is taken from the . 11 The phase shift between the input signal and the output signal of a CC amplifier is degrees. 12 The output impedance of an emitter follower is usually very . 13 In a common-base configuration, the output is taken from the . 14 A signal that has a peak-to-peak current equal to or less than one-tenth of the dc diode current is typically referred to as signal. 15 Because the output signal follows the input signal, the amplifier is usually referred to as an emitter follower. 16 With the amplifier, the output is taken from the collector. 17 The of a transistor deals specifically with dc voltages and currents. 18 The common-collector has a A) high input impedance and high output impedance B) low input impedance and low output impedance C) high input impedance and low output impedance D) low input impedance and high output impedance 19 Which transistor amplifier configuration offers effective impedance matching? A) common-base B) common-collector C) common-emitter D) base follower 20 When the emitter follower is used to isolate a low value of load resistance from the high impedance collector, the emitter follower serves as a(n) A) bridge circuit B) amplifier C) coupler D) buffer 21 Which transistor configuration provides some desirable features for operation at higher frequencies? A) common-base B) common-emitter C) common-collector D) base follower 22 Which transistor configuration has the best high frequency response and also has a low input impedance that approximates the 50Ω rf-circuitry antennas? A) common-base B) common-emitter C) common-collector D) base follower 23 The purpose of the dc bias is to A) set the gain of the amplifier B) couple the ac signals from stage to stage C) establish the desired operating point D) determine the amplifier's input impedance 24 In the CE configuration, what provides a low-impedance path for ac signals between the emitter terminal and ground? A) input coupling capacitor B) emitter resistor C) base-emitter junction D) emitter bypass capacitor 25 One way to significantly reduce distortion in a CE amplifier is to add a(n) A) emitter bypass capacitor B) another amplifier stage C) swamping resistor in the emitter circuit D) larger coupling capacitor
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