更多"[判断题]只有和电台工作频率相近的无线电波才能对电台产生干扰。"的相关试题:
[单选题]
某甚高频电台工作频率范围是118MHz～136.975MHz，
该电台可提供25kHz频率间隔的信道总数是____。
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[判断题]已知电台工作频率是350MHZ,如有三个干扰频率:350.1.350.2.350.3,则会产生三阶互调干扰。(难)(基础知识)
A.正确
B.错误
[判断题]
当干扰电台的频率等于或接近于VHF接收机的中频频
率时，干扰信号和有用信号在检波输出产生差拍，此
干扰信号称为互调干扰。
A.正确
B.错误
[单选题]
当干扰电台的频率等于或接近于本接收机的中频频率
时，干扰信号和有用信号在检波输出产生差拍，此干
扰称为（）
A.邻近干扰
B.交差干扰
C.中频干扰
D.互调干扰
[判断题]每个波段设有10个电台频率存储器，各保存10个电台的播音频率
A.正确
B.错误
[单选题]
各无线电台站频率一经指定，（）。
A.可以随时变更
B.每隔一年变更一次
C.不准自行变更
D.以上都不对
[单选题] 单选题 民用航空电台专用频率是由( )管理。
A. 国务院民用航空主管部门
B. 空管局
C. 广电总局
D. 省级无线电管理委员会
[判断题]
各无线电台站频率如需要变更，应当报告当地政府，
并按正式变更通知实施。
A.正确
B.错误
[判断题] 判断题 在《中国民用航空无线电管理规定》中规定,各无线电台站频率一经指定,可以自行变更。如需要变更,应当报告民航局无线电管理委员会,并按正式变更通知实施。
A.正确
B.错误
[单选题]
当收听某电台639kHz的节目时（收音机中频为465kHz），
可能产生的镜像干扰频率为（）
A.1569kHz
B.465kHz
C.1104kHz
D.639kHz
[单选题]A330-300飞机上还有一套固定应急发报机系统。是三频率电台，这些频率是国际民航组织通用遇难时发出求救信号的频率。 答案：A
A.B.否
B.正确
[判断题]A330-2飞机上还有一套固定应急发报机系统。是三频率电台，这些频率是国际民航组织通用遇难时发出求救信号的频率。
A.正确
B.错误
[单选题]
我国民航各类无线电台站受到国外电台产生的有害干
扰，有关部门收到有害干扰报告后，应当（）。
A.报告民航局无线电管理委员会
B.报请国家无线电管理委员会处理
C.A和B都需要
D.A和B都不需要
