Electronics Engineering (ELEX) Board Practice Exam

Asynchronous circuits are particularly useful in applications where input signals may:

1. Change continuously

2. Both change at any time and never change

3. Be sampled at a fixed interval

4. Only change at predictable intervals

The correct answer is: Both change at any time and never change

Asynchronous circuits are designed to operate without a global clock signal, which allows them to respond to input changes in real-time. This is particularly advantageous in scenarios where input signals can change at any time, making them highly flexible for dynamic environments. The correct answer highlights the adaptability of asynchronous circuits to handle situations where inputs can both change at unpredictable moments and also not change at all. They efficiently manage asynchronous events, enabling the system to react immediately to unforeseen input changes while remaining idle when there are no changes. In contrast, synchronous circuits rely on clock signals to operate, leading to potential delays in response to input changes, which can be inefficient for applications requiring immediate action. Therefore, the unique capability of asynchronous circuits to accommodate both unpredictable changes and periods of inactivity makes them especially useful in diverse applications.