21. A class A power amplifier uses ___________ A. Two transistors B. Three transistors C. One transistor D. None of the above 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. The maximum efficiency of transformer coupled class A power amplifier is ___________ A. 30% B. 50% C. 80% D. 45% 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
23. The most important consideration in power amplifier is ___________ A. Biasing the circuit B. Collector efficiency C. To keep the transformer cool 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
24. What turn ratio (Np/Ns) of transformer is required to match 4 Ω speaker to a transistor having an output impedance of 8000 Ω? A. 2 B. 7 C. 3 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
25. The size of a power transistor is made considerably large to ___________ A. Provide easy handling B. Dissipate heat C. Facilitate connections 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
26. If the power rating of a transistor is 1W and collector current is 100mA, then maximum allowable collector voltage is ___________ A. 1V B. 100V C. 20V D. 10V 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 output stage of a multistage amplifier is also called ___________ A. Mixer stage B. Power stage C. Detector stage D. F stage 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
28. Power amplifiers handle ___________ signals compare to voltage amplifiers A. Small B. Very small C. Large D. None of the above 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
29. The pulsating d.c. applied to power amplifier causes ___________ A. Burning of transistor B. Hum in the circuit C. Excessive forward voltage 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
30. For the same a.c. power output as above, what should be the minimum power rating of transistor for class B operation? A. 10 W B. 4 W C. 8 W 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