21. 1 db corresponds to ___________ change in power level A. 50% B. 35% C. 26% D. 22% Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
22. An amplifier receives 0.1 W of input signal and delivers 15 W of signal power. What is the power gain in db? A. 8 db B. 6 db C. 5 db D. 4 db Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
23. The final stage of a multistage amplifier uses ___________ A. RC coupling B. Transformer coupling C. Direct coupling D. Impedance coupling Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
24. In obtaining the frequency response curve of an amplifier, the ___________ A. Amplifier level output is kept constant B. Amplifier frequency is held constant C. Generator frequency is held constant D. Generator output level is held constant Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
25. If a three-stage amplifier has individual stage gains of 10 db, 5 db and 12 db, then total gain in db is ___________ A. 600 db B. 24 db C. 14 db D. 27 db Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
26. In RC coupling, the value of coupling capacitor is about ___________ A. 100 pF B. 0.1 µF C. 0.01 µF D. 10 µF Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
27. The ear is not sensitive to ___________ A. Frequency distortion B. Amplitude distortion C. Frequency as well as amplitude distortion D. None of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
28. RC coupling is generally confined to low power applications because of A. Large value of coupling capacitor B. Low efficiency C. Large number of components D. None of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
29. ___________ coupling provides the maximum voltage gain A. RC B. Transformer C. Direct D. Impedance Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
30. 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 Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board