31. What will be the collector efficiency of a power amplifier having zero signal power dissipation of 5 watts and a.c. power output of 2 watts? A. 20% B. 80% C. 40% D. 50% 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
32. A transformer coupled class A power amplifier has a load of 100 Ω on the secondary. If the turn ratio is 10:1, what is the value of load appearing on the primary? A. 5 kΩ B. 20 kΩ C. 100 kΩ D. 10 kΩ 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
33. When a transistor is cut off___________ A. Maximum voltage appears across transistor B. Maximum current flows C. Maximum voltage appears across load 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
34. Low efficiency of a power amplifier results in ___________ A. Low forward bias B. Less battery consumption C. More battery consumption 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
35. If the gain versus frequency curve of a transistor amplifier is not flat, then there is distortion. A. Amplitude B. Intermodulation C. Frequency 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
36. A power amplifier has comparatively ___________ ß A. Small B. Large C. Very large 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
37. Power amplifiers generally use transformer coupling because transformer per-mits A. Cooling of the circuit B. Impedance matching C. Distortionless output D. Good frequency response 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
38. The driver stage usually employs___________ A. Class A power amplifier B. Push-pull amplifier C. Class C amplifier 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
