Practice Test (See related pages) 1 The three general classes for power amplifiers are class I, class II, and class III. A) True B) False 2 The collector current of a transistor in a class A amplifier flows for 360° of the input waveform. A) True B) False 3 A class A amplifier can be used as a linear amplifier. A) True B) False 4 The collector current of a transistor in a class B amplifier flows for only 180° of the input signal. A) True B) False 5 The typical operation of a class C amplifier provides a collector current that flows for approximately 270° or more of the input cycle. A) True B) False 6 The signal amplitude of any class A amplifier at the input should be large enough to drive the amplifier into either cutoff or saturation. A) True B) False 7 In a class A amplifier, the power dissipation in the transistor increases when an ac signal is applied to the input. A) True B) False 8 The percent efficiency of any amplifier is defined as the percentage of the dc input power that is converted to useful ac power output. A) True B) False 9 Coupling and bypass capacitors affect the output of an amplifier at high frequencies. A) True B) False 10 A true class B amplifier is biased such that the Q point is located at . 11 Class C amplifiers are generally used in rf amplifiers. 12 Typical class C amplifiers have efficiencies of approximately %. 13 Those frequencies in which the voltage gain is 70.7% or more of its maximum at resonance is referred to as the . 14 The maximum theoretical efficiency possible for a class A amplifier using a single collector resistor is %. 15 With class AB operation, distortion is entirely eliminated. 16 Crossover distortion results in a class B push-pull amplifier when the transistors are biased at . 17 Tuned class amplifiers can be used as frequency multipliers by tuning the LC tank circuit to a harmonic of the input frequency. 18 What is the form of bias used for class B push-pull amplifiers that uses diodes to provide a slight amount of forward bias for the base-emitter junctions of each transistor? A) voltage-divider bias B) self-bias C) diode bias D) current-source bias 19 Which of the following is not an advantage of using a split supply class B push-pull? A) more output power B) no dc current flow in speaker load C) low frequency response greatly improved D) lower supply voltages can be used 20 Which amplifier class has the highest efficiency? A) A B) AB C) B D) C 21 The collector current of a transistor in a class B amplifier flows for A) approximately 60° of the input waveform B) approximately 120° of the input waveform C) 180° of the input waveform D) 360° of the input waveform 22 What is typically used to reproduce a full sine-wave at its output for each short pulse of collector current in a class C amplifier? A) oscillator circuit B) regulator circuit C) tank circuit D) bridge circuit 23 Which class amplifier has characteristics that include very high efficiency and severe distortion of the input signal? A) A B) B C) AB D) C 24 The percentage of the dc input power that is converted to useful ac power output is the A) class of amplifier B) conduction percentage of an amplifier C) power ratio of an amplifier D) percent efficiency of an amplifier 25 The higher frequencies in the output voltage of an amplifier are substantially affected by what capacitance? A) coupling capacitors B) bypass capacitors C) stray wiring capacitance D) varactor diodes
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