Which of the following is/are the limitations of amplitude modulation?

Options

A. Clear reception
B. High efficiency
C. small operating range
D. good audio quality

Answer

To determine the limitations of amplitude modulation (AM), we can analyze the options provided in the question step by step.

### Step 1: Understanding Amplitude Modulation (AM)
Amplitude modulation is a technique used in electronic communication, most commonly for transmitting information via a radio carrier wave. In AM, the amplitude of the carrier wave is varied in proportion to the waveform being sent.

**Hint:** Recall the basic principle of amplitude modulation and its purpose in communication.

### Step 2: Evaluating the Options
Let's evaluate each of the options given in the question:

- **A: Clear Reception** - AM signals are susceptible to noise and interference, which can affect the clarity of reception. Thus, this is not a limitation.

**Hint:** Consider how noise affects signal clarity in communication systems.

- **B: High Efficiency** - AM is generally not considered highly efficient compared to other modulation methods like frequency modulation (FM). However, this option does not directly describe a limitation of AM.

**Hint:** Think about how efficiency is measured in communication systems.

- **C: Small Operating Range** - AM signals have a limited range due to their susceptibility to noise and interference, especially over long distances. This is indeed a limitation of amplitude modulation.

**Hint:** Reflect on the factors that influence the range of a communication signal.

- **D: Good Audio Quality** - While AM can provide decent audio quality, it is not as good as FM. However, this option does not directly indicate a limitation of AM.

**Hint:** Compare the audio quality of AM with other modulation techniques.

### Step 3: Conclusion
Based on the analysis of the options, the only option that represents a limitation of amplitude modulation is:

**C: Small Operating Range**

### Final Answer
The limitation of amplitude modulation is that it has a small operating range.

---