In a swamped amplifier the effects of re become A critical t

In a swamped amplifier, the effects of r\'_e become A) critical to input impedance. B) insignificant. C) significant to the analysis. D) important to voltage gain. 14) Class A amplifiers A) always operate in the non-linear region of the ac load line B) are used as power amplifiers only C) are small signal amplifiers only D) always operate within the linear region 15) Clipping can be caused by A) biasing too close to cutoff B) biasing too close to cutoff C) too high an input signal D) all of the above 16) If an application for an amplifier requires operation in a linear mode, the most likely choice would be a A) class A. B) class B. C) class C. D) class AB. 17) A CE amplifier has a load power of 10 mW and the dc power is 215 mW. The efficiency is A) 25%. B) 46.5%. C) 4.65%. D) 0%. 18) The maximum efficiency of a class B push-pull amplifier is A) 25 percent. B) 50 percent. C) 100 percent. D) 79 percent. 19) Unlike a class A amplifier, a class B amplifier A) has a maximum theoretical efficiency of 25% B) consumes a lot of power with no input signal C) conducts during the entire 360degree of the input signal D) consumes very little power with no input signal

Solution

13) answer: D important to voltage gain

       r\' depends on temparature and any change in r\' cause change in voltage gain.

14) Answer : D class a amplifiers always operates in linear mode due to its simple constuction and there is no cross over or switch-off distortion to the output wave.

15) Answer : D

16) Answer : A if an amplifiers wants to operate in linear mode the most common type is class A

17) Answer : C

     efficiency = (output ac power)/(input dc power)*100

    efficiency= (load power)/(dc power)*100

   efficiency=(10/215)*100

                = 4.65%

18) Answer: D

    the max.efficiency of class b is 78.5% that is aproximately 79%

19) Answer : D

so that the efficiency is very high