Discussion of incorrect answers in the new question bank

ShadowMov

自7.29全网第一个上线新题库刷题工具以来，本人一直在AI辅助下补充题解的覆盖率。
目前已经通过通义千问3-Plus（with RAG）、GPT-5-Chat、Claude-4-Sonnet 等模型跑了一轮A类题库，并进行人工审核，发现下面这些A类题有问题：
MC2-0035，解析：https://exam.bh5hsu.com/question/MC2-0035，C项有明确法律条文支持其正确。
MC4-0066，D选项，LF波段136kHz有1W eirp的限制，直接说允许LF申请小于15W可能存在争议。
MC2-0167，解析：https://exam.bh5hsu.com/question/MC2-0167，C项有明确法律条文支持其正确。
MC1-0185，题干中WARC-76应为WARC-79。
MC1-0437，D选项应当正确，A选项表述存在不严谨的地方（需要注明在单个频点无法同时接收）。
MC1-1300，占空比50%的方波有效值并不是最大值的 1/2，详见解析：https://exam.bh5hsu.com/question/MC1-1300
MC1-1365，按GB/T 3805－2008，潮湿状态下，直流电电压限值为35V，而不是选项中的33V。

此外，部分之前老题库已知有问题的题目也没有改过来：
MC1-1008，解析：https://exam.bh5hsu.com/question/MC1-1008
MC1-1009，解析：https://exam.bh5hsu.com/question/MC1-1009

这些题目确实错了吗？大家还有发现哪些错题？

FengziLeo

The first MC2-0035 I opened in CRAC shows the "2025" option.

FengziLeo

FengziLeo I checked the question bank again and noticed that it was initially displayed as "2024," which I believe may have been an error, and I corrected it.

ShadowMov

FengziLeo Indeed, a quick comparison revealed that the question below had already been corrected by CRAC in a previous iteration:
MC2-0035、MC1-0059、MC4-0066、MC1-0308、MC1-0533、MC2-0638、MC1-1008、MC1-1009、MC3-1272、MC1-1375

However, the updated version of the operating procedures available on the official website is somewhat confusing. It only has an update to version 0809 in the "Amateur Radio Operating Procedures Capability Verification Question Bank (2025 Edition)" section under "Downloads - Resources," while all other downloads still have version 0728.

FengziLeo

ShadowMov Oh, that's true. You can certainly send an email to the association about this issue, and I'm sure they would be happy to make changes.

BH5UWL

ShadowMov MC1-1009好像没更新到57.7

ShadowMov

ShadowMov
这个diff漏了 MC1-0016、MC1-1236两题。

yuhjnmwe

BA4TAY 看帖不仔细

ShadowMov 不过官网发修正版本的操作略迷，只在官网 - 资料下载 - 业余无线电台操作技术能力验证题库（2025 年版）有更新 0809 版本，别的地方下载都还是 0728 的版本

ShadowMov

FengziLeo I sent a few emails, but only the first one received a response.

ShadowMov

I've started looking at B-level question banks, and I've found some questions that seem to be incorrect.
MC1-0319, according to IARU's "Radio Amateur General Code of Practice" (Chinese version), section 2.9.6, it is not recommended to use "PSE K".
MC1-0813, Option B has several supporting arguments:https://exam.bh5hsu.com/question/MC1-0813
MC1-1006, similar to MC1-1300, the issue with the 50% duty cycle square wave.
MC1-1012, with two identical options
There were many errors in questions related to effective value and average value of voltage.

ShadowMov

ShadowMov
上面MC1-1006的计算没有问题，有误的是MC1-1007和MC1-1300

另外，新增一道：MC2-0925 混淆了曲率这个概念，也存在问题。

BI8SPH

Great post! I was already starting to doubt everything after seeing questions 1 through 35, but this really highlights how absurd things can be.

ShadowMov

More questions:
MC1-0546, SOSB-20 (Single Operator Single Band 20m) does not specifically require or support Assisted operation, and it may also be incompatible with CW Skimmers.
The dBμ units used for MC1-0962, MC1-0963, MC1-0964, MC3-1342, MC3-1343, and MC3-1344 are not a standard format; they should be expressed as dBμW.
MC-1090, electrolytic capacitors are typically measured in microfarads (µF). It is rare to see capacitors labeled with farads.

Additionally, MC1-0437, which previously indicated that option D was correct (but it seems inaccurate – the FM carrier frequency is not constant), also appears to be incorrect. Options A and D seem particularly problematic.

BG5VXJ

Therefore, the most time-consuming part of reviewing the question bank is updating the software, which may only take one or two days.

ShadowMov

C also completed a round, with new incorrect answers:

MC1-1236, after being modified from LK1055, its statements are no longer as rigorous as before.

As of now, this is all the incorrect answers I've found. I don't know if anyone else has more, or if they think some of these are actually correct.

BH5UWL

I also found a few mistakes, and I discussed them with my friends. We all agreed that they were not accurate. Also, the 0809 version didn't change, so I thought it was best to "follow the official exam answers." However, discussing these errors is perfectly fine.

MC1-0702, clockwise means right rotation.
MC1-0914, a 2-meter antenna, is also used for meteor debris. MC1-0915, the FT4 antenna, is not used for meteor debris.
MC3-0968 also includes devices that are powered by dry cell batteries.
MC1-1090, as you mentioned, the Falcon units are quite large and not very common.

ShadowMov

BH5UWL
According to RAG-based AI, MC1-0914 identified a frequency band of 6 MHz as the most suitable for detecting meteor debris.https://exam.bh5hsu.com/question/MC1-0914
In MC3-0968, the question mentions "external power supply," but batteries are generally not used for external power supplies.

Several other users have reported similar issues.

Hydroxide

BH5UWL
MC1-0702的解释是因为信号是右旋，但这个右旋是以信号传播方向为“前”定义的，“从地面看卫星”则是反过来，所以是左旋。。纯坑题
MC1-0914说是最合适倒也没问题，最合适肯定是6m，俩都玩过的肯定深有体会。。
MC1-0915确有问题，FT4勉强能用但从来不是MS主流模式
另外MC1-0913的B选项我认为也是正确的，UHF包括了432、1296和2304三个频段，后两个频段的典型馈线损耗已经相当可观，因此将低噪放直接接在馈源上或至少在塔上几乎是必要的（更高频率就更是了），而50M以下频段完全不需要考虑这个

BH5UWL

This website is very well done. I was also recommended it by someone when I was looking for a new question bank application.
A personal suggestion: If the question bank could be categorized by topic, it would allow individuals to focus on their weaker areas rather than randomly selecting questions from the entire bank each time. This would save time and effort. For specific implementation details, please refer to the "HAM Exam Preparation Practice" WeChat mini-program.

ShadowMov

BH5UWL The old question bank can be used to export categorized information through reverse analysis of the official exam software. However, the new question bank does not currently have a clear source for categorized information. Currently, it is only possible to guess [P
] The field contains information about the exam syllabus chapters. We also need to wait and see if the official source will provide specific categorization information, and then decide whether or not to include it, and how to implement the categorization functionality.

BH5UWL

ShadowMov Using AI to ask questions like "What evidence supports the use of the 2-meter band for communication with meteor debris?" can also yield valuable information. I have also discussed this point with other colleagues, and they agree. Therefore, the answers provided by AI sometimes require verification from multiple perspectives.
External power sources, such as a set of 18650 batteries, are also common. However, his use of the term "standard battery" is not entirely precise.

ShadowMov

BH5UWL It's important not to over-rely on AI, so I've incorporated RAG (Retrieval-Augmented Generation) knowledge retrieval into the AI. Specifically, I retrieved information from the "No-Nonsense Technician Class License Study Guide" book to identify the 6 MHz frequency band that is most suitable for meteor debris scattering. This topic is also covered in the FCC exam.

ShadowMov

ShadowMov
BH5UWL
However, why "6m" specifically? The book doesn't seem to explain this clearly either. More investigation is needed.

ShadowMov

BH5UWL

Regarding "standard batteries," I searched for it and believe it refers to the standard battery defined in GB/T 3929-1983. It's not a typical AA/AAA type of dry cell, but rather a reference based on electromotive force.

BG2KAJ

ShadowMov 是的，标准电池是不能供电的，只能作为电压标准

闽ICP备2021006864号-7

闽公网安备35020602002794号互联网举报中心

用户协议隐私政策社区规范积分规则中继规则转载须知
更新日志联系我们常见问题友情链接运营报告赞助

浩奇科技（厦门）有限公司

是无线电，把我们联系在一起