Subelement A: — Topic :
Question 6A189
Element 6 (Radiotelegraph)"The temperature coefficient of an x-cut crystal is negative":
Explanation
A negative temperature coefficient for a crystal implies an inverse relationship between temperature and operating frequency.
Specifically:
* As the temperature *increases*, the crystal's operating frequency *decreases*. This aligns with option B.
* Conversely, as the temperature *decreases*, the crystal's operating frequency *increases*. This aligns with option C.
Both statements B and C accurately describe the behavior of a crystal with a negative temperature coefficient. Therefore, D, which combines B and C, is the correct answer. Option A describes the behavior of a crystal with a positive temperature coefficient. Crystal cuts like the X-cut are known for this characteristic frequency drift with temperature.
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