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electronics and communication engineering radio receivers
1. An unmodulated voltage 10 V effective is applied to a dioxide detector in which load resistance is 4 x 10-5 ohms. A micrometer shows that the rectified DC current in this resistance is 30 A. The efficiency of detection is
(A): 34%
(B): 55.5%
(C): 68.8%
(D): 84.7%
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