12. The output voltage of an emitter follower is across the a) Emitter diode b) Dc collector resistor c) Load resistor external ac emitter resistance. d)emitter diode and 13. If ẞ- 200 and r. 1502, the input impedance of the base is: 30 ΚΩ b) 600 Ω c) 3 ΚΩ α) 5 ΚΩ 14. The ac emitter current is closest to a) Vo divided by re b) Vin divided by re c) Vo divided by re d) Vin divided by re 15. The ac load line of an emitter follower is usually a) The same as the dc load line b) More horizontal than the dc load line Steeper than the dc load line d) Vertical 16. If the load resistance of an emitter follower is very large, the external ac emitter resistance equals: a) Generator resistance b) Impedance of Base c) DC emitter resistance d) DC collector resistance. 17. If an emitter follower has re-102 and re-902, the voltage gain is approximately a) 0 b) 0.5 20.9 18. The tramsistors of a class B push-pullemitter follower are biased at or near d) 1 de land line c) Saturation d) center of ac load line b) More horizontal than the de Steeper than the de load line Vertical 16. If the load resistance of an emitter follower is very large, the external ac emitter resistance equals: c) DC emitter resistance d) DC collector resistance. a) Generator resistance b) Impedance of Base 17. If an emitter follower has r. -1002 and r,-9002, the voltage gain is approximately b) 0.5 4) O 0.9 18. The tramsistors of a class B push-pullemitter follower are biased at or near b) The center of the de load line c) Saturation Cutoff d) 1 d) center of ac load line 19. The first stage of a preamp is: A tuned RF stage b) large signal c) small signal d) a de amplifier 20. For Maximum peak-to-peak output voltage, the Q point should be: a) Near saturation b) Near Cutoff at center of de load line d) at center if ac load line. 21. When the Q-point is at the center of the ac load line, the maximum peak-to-peak output voltage equals: a) VCEQ b) 2VCBQ 22. Push-pull is almost always used with: c) IcQ d) 21cQ a) Class A b) Class B c) Class C d) All of the above 23. Class C amplifiers are almost always: a) Transformer-coupled between stages b) Operated at audio frequencies c) Tuned RF amplifiers d) Wideband 24. The quiescent collector current is the same as the: a) DC collector current b) AC collector current divider current. c) Total collector current d) Voltage 25. The ac load line is the same as the dc load line when the ac collector resistance equals the a) DC emitter resistance b) AC emitter resistance c) DC collector resistance d) Supply voltage divided by collector current. 26. One advantage of a class B push-pull amplifier is a) No quiescent current drain b) Maximum efficiency of 78.5 percent c) Greater efficiency than class A d) All of the above