No, not all microwave ovens beep when you hit the "Start" button. The presence or absence of a beep when you press the "Start" button can vary depending on the specific model and brand of the microwave oven.
Some microwave ovens are designed to provide audible feedback in the form of a beep when you press any button, including the "Start" button. This beep serves as an acknowledgment that the command has been received and the microwave is beginning the cooking process.
On the other hand, certain microwave models may not have an audible beep for every button press, including the "Start" button. Instead, they might have other ways to indicate that the cooking process has started, such as displaying a timer countdown on the control panel or flashing the display.
The presence of beeps and the overall functionality of microwave ovens can vary widely, so it's a good idea to refer to the user manual of your specific microwave model to understand its features and settings better, including whether it provides audible feedback or not.