音视频设备检验复习题2010年强化题（Audio and video equipment inspection review questions, 2010）.docVIP

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音视频设备检验复习题2010年强化题（Audio and video equipment inspection review questions, 2010）.doc

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音视频设备检验复习题2010年强化题（Audio and video equipment inspection review questions, 2010）

音视频设备检验复习题2010年强化题（Audio and video equipment inspection review questions, 2010） Examination of audio and video equipment examiner -- 10 First, the multiple-choice question: (B) the maximum voltage at which the 1. line outputs are supplied is the supply voltage A.10 times, B.8 times, C.6 times, D.2 times (A) 2.CD player transfer signal pickup from the turntable A. digital signal, B. analog signal, C. audio signal, D. pulse signal (B) the modulation mode of the 3. television sound on the second intermediate frequency is adopted A. amplitude modulation, B. frequency modulation, C., phase modulation, D. pulse coding (A) 4. color TV sets are seriously crawling A. ultrasonic delay line, B. matrix circuit, C. phase locked circuit, D. synchronous detection circuit (B) of the 5. magnetic biasing modes of the recording head, the best is A. DC bias B. AC bias C. constant magnetic bias D. non bias magnetic (C), the following 6 indicators, has no effect on audio signal quality ___. A, SNR, B, distortion C, signal level D, harmonic (A) 7, the audio amplifier works under certain voltage, in order to improve the output power, in addition to improving the power amplifier circuit, The speaker specifications should also be improved as follows ___ A, impedance reduction, rated power increased by B, impedance increased, rated power increased B, impedance constant, rated voltage increased by D, impedance unchanged, rated current increased (C) 8, the tube work, radiating out of harm to the human body _____, so need to use the tube Leaded glass blocks it to reduce leakage. A, infrared, B, ultraviolet C, X ray, D, and other electromagnetic waves (B) 9, compared to CRT, LCD display has the disadvantages of ______. A, large power consumption, B, narrow viewing angle, C, low resolution, D, serious electromagnetic radiation (D) 10. The primary function of the detector is to pick up A. IF signal, B. high frequency signal, C. DC signal, D. original modulation signal (D) the 11. crystal triode is