# Introduction to Amplifiers

## Quiz Questions

 1. Amplitude is a term that describes the size of a signal. True False 2. SIGNAL is a general term used to refer to a.c.or d.c. of interest in a circuit; e.g., input signal and output signal. True False 3. What determines the class of operation of an amplifier? Amount of time in which current flows in the output circuit None 4. What are the four classes of operation of a transistor amplifier? A, AB, B, C A, B, C, D A, AB, 5. Figure1-8 represents Adding stages of amplification Direct-coupled transistor amplifiers 6. In direct coupling the output of one stage is connected directly to the input of the following stage. True False 7. What is the most common form of coupling? RC coupling Transformer coupling 8. There are two types of feedback in amplifiers. They are Positive Feedback \ Regenerative Feedback Negative Feedback \ Degenerative Feedback Both 9. What is one use for a splitter? A phase splitter is used to provide the input signals to a push-pull amplifier. Not the above 10. Figure 1-23 represents Transistor audio amplifier FET audio amplifier 11. What is the bandwidth of an amplifier? Difference between the upper and lower frequency limits of an amplifier Bandwidth of a transformer 12. What are the upper and lower frequency limits of an amplifier? Half-power points of a frequency-response curve Full-power points of a frequency-response curve 13. What is the purpose of R4? A part of the low-frequency compensation network for Q1 A decoupling capacitor for the effects of R2 14. Figure 2-21 represents _______________. Typical RF amplifier Typical AM radio RF amplifier None 15. A frequency response curve will enable to determine the bandwidth and the upper and lower frequency limits of an amplifier. True False 16. How many inputs and outputs are possible with a differential amplifier as in chapter3? Two inputs, two outputs One input, two outputs 17. Figure 3-8. represents ______________. Single-input, differential-output differential amplifier Single-input, single-output differential amplifier 18. Operational amplifiers are usually high-gain amplifiers with the amount of gain determined by feedback. True False 19. Figure 3-11 represents ____________. Block diagram of an Op-amp Schematics of an Op-amp 20. A magnetic amplifier uses a changing inductance to control the power delivered to a load. True False