If PB 1 is pressed and held with the control circuit power ON, which motors are affected?

The scenario involves understanding how control circuits operate, particularly when a push button, labeled PB 1, is pressed and held while the control circuit is powered on. In many control systems, pressing a button can energize specific motors or equipment based on the circuit's design.

In this case, the correct answer indicates that when PB 1 is pressed and held, motor M1 becomes energized, while motor M2 becomes de-energized. This suggests that the control circuit is structured in such a way that pressing the button activates M1, likely involving a relay or contactor that connects the power supply to M1. At the same time, the operation of M1 seems to require M2 to be turned off, possibly due to interlocking conditions designed to prevent both motors from running simultaneously—for instance, to avoid overloading the circuit or for safety reasons.

This indicates that the control logic is specifically designed to function in a certain manner when the push button is engaged, demonstrating an important principle in motor control circuits: they often use interlocking or phased operation to ensure electrical safety and efficiency in operation. The nature of the control circuit is crucial in determining how the components interact under various conditions.

Understanding these fundamentals helps in troubleshooting and designing circuits in electrical systems