32. A class C amplifier has a tank circuit in the output. The amplifier is conducting only 28°. The output voltage is ________.
(a) 0 V.
(b) a dc value equal to VCC.
(c) a sine wave.
(d) a square wave with a frequency determined by the tank.
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- Regulated Power Supplies » Exercise - 3 101. In a simple series regulator circuit, which of the following components is the controlling element? (a) Load resistor (b) Zener diode (c) Transistor Q1 (d) None of the above 102. What regulated output voltage is provided for the following circuit elements: R1 = 15 kΩ, R2 = 35 kΩ, and VZ = 11.2 V? (a) 16.50 V (b) 17 V (c) 17.35 V (d) 18.25 V 103. Nota 104. Which component(s) set(s) the voltage across the load in a basic transistor shunt regulator? (a) Zener diode (b) Transistor base-emitter voltage (c) Both the Zener diode and the transistor base-emitter voltage (d) None of the above 105. In a full-wave rectifier, if no load were connected across the capacitor, the output voltage would ideally be a(n) ________. (a) ac voltage (b) constant dc voltage (c) pulsating dc voltage (d) ramp voltage 106. The output of a loaded power supply is ________ that of the unloaded. (a) the same as (b) larger than (c) smaller than (d) None of the above 107. The frequency of the output voltage of a full-wave rectifier is ________ the frequency of its input voltage. (a) the same as (b)…
- Electronics Engineering » Notes » Single Stage Transistor Amplifiers 1. There are four classes of amplifier operations : Class A, Class AB, Class B, and Class C. 2. Class A amplifiers operate entirely in the active region and thus the output if a faithful reproduction of the input signal with some amplification. In a Class A amplifier the efficiency is very low. Class A amplifiers are usedfor audio and frequency amplification. 3. Class AB amplifiers are biased so that the collector current is cutoff for a portion of one cycle of the input and so the efficiency is higher than that of a Class A amplifier. Class AB amplifiers are normally used as push−pull amplifiers to alleviate the crossover distortion of Class B amplifiers. 4. Class B amplifiers are biased so that the collector current is cutoff during one−half of the input signal. Therefore, the efficiency in a Class B amplifier is higher than that of a Class AB amplifier. Class B amplifiers are used in amplifiers requiring high power output. 5. Class C amplifiers are biased so that the collector current flows for less than one−half cycle of the input signal. Class C amplifiers have the highest efficiency and are used for radio frequency amplification in transmitters. Figure-1 :…