Mixed Quiz (See related pages) 1 There are only three amplifier classes, A, B, and C. A) True B) False 2 Class A operation of an amplifier means that the collector flows for the entire cycle. A) True B) False 3 The three types of amplifier coupling methods are capacitive, transformer, and direct. A) True B) False 4 Capacitive coupling and transformer coupling block ac voltage. A) True B) False 5 A radio frequency amplifier is one that amplifies frequencies below 20 kHz. A) True B) False 6 With a class A amplifier, collector current flows for one-half of the cycle. A) True B) False 7 The efficiency of an amplifier is equal to dc output power divided by the dc input power. A) True B) False 8 A class AB amplifier is defined as an amplifier with a conduction angle of 180°. A) True B) False 9 Class B and AB amplifiers require a stable operating point near saturation. A) True B) False 10 Cutoff and saturation clipping are undesirable because they the signal. 11 The amplifier stage that precedes the output stage is the . 12 Harmonics are of a frequency. 13 If an amplifier circuit has a high quality factor (Q), the bandwidth is . 14 The type of amplifier coupling that uses inductive action is a . 15 The type of amplifier coupling that can couple 0 Hz is . 16 An amplifier that is designed to work over a small range of frequencies is classified as . 17 An amplifier that has a conduction angle between 180° and 360° is referred to as class . 18 With amplifier class C operation, the collector current flows for A) the entire cycle B) half the cycle C) less than half the cycle D) 56 milliseconds 19 When a tank circuit is resonant, the ac load impedance seen by the collector current source is A) maximum and purely resistive B) maximum and inductive C) minimum and purely resistive D) maximum and capacitive 20 The power rating of a transistor can be effectively increased A) by using bigger transistors B) by reducing power supply voltages C) by using heat sinks D) by using slow-blow fuses 21 Types of amplifier coupling do not include A) transistor B) direct C) capacitive D) transformer 22 An amplifier that operates in the range of 20 Hz to 20 kHz is A) a wideband amplifier B) a narrowband amplifier C) audio amplifier D) tuned amplifier 23 If the operating point of an amplifier is at or near saturation A) the output signal will be distorted B) the collector current will be zero C) the output signal will be an exact reproduction of the input signal D) the input signal will be distorted 24 When a transistor circuit operates as a class B amplifier A) the output is an exact reproduction of the input B) one half cycle is clipped off C) there is no distortion D) most of the cycle is clipped off 25 The amplifier stage that precedes the output stage is referred to as the A) preamp B) power amplifier C) tuned tank D) driver
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