1) A gain of 1000 times in voltage is expressed by_______________? a. 60 db b. 30 db c. 120 db d. 600 db
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2) The upper or lower cut off frequency is also called______________frequency? a. Resonant b. Sideband c. 3 db d. None of the above
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3) The power output of an audio system is 18 W. For a person to notice an increase in the output (loudness or sound intensity) of the system, what must the output power be increased to ? a. 2 W b. 6 W c. 68 W d. None of the above
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4) The number of stages that can be directly coupled is limited because___________? a. Changes in temperature cause thermal instability b. Circuit becomes heavy and costly c. It becomes difficult to bias the circuit d. None of the above
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5) The bandwidth of a single stage amplifier is_____________that of a multistage amplifier? a. More than b. The same as c. Less than d. Data insufficient
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6) The output of a microphone is rated at -52 db. The reference level is 1V under specified conditions. What is the output voltage of this microphone under the same sound conditions? a. 5 mV b. 2 mV c. 8 mV d. 5 mV
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7) If the power level of an amplifier reduces to half, the db gain will fall by___________? a. 5 db b. 2 db c. 10 db d. 3 db
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8) In the initial stages of a multistage amplifier, we use______________? a. RC coupling b. Transformer coupling c. Direct coupling d. None of the above
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9) A gain of 1,000,000 times in power is expressed by_____________? a. 30 db b. 60 db c. 120 db d. 600 db
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10) In transistor amplifiers, we use_____________transformer for impedance matching? a. Step up b. Step down c. Same turn ratio d. None of the above
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