What is used for tripping time control in timers by utilizing oil flow?

The correct answer relates to dashpots, which are mechanical devices used to control the movement and flow of fluid to create a damping effect. In the context of timers, dashpots utilize oil flow to manage the timing mechanisms effectively. The damping effect produced by the oil flow allows for precise control over the delay periods, making them ideal for applications where controlled timing sequences are necessary.

Dashpots work by restricting the flow of oil through a passage, which results in a time delay based on the viscosity of the oil and the design of the dashpot itself. This principle is utilized in various types of timers where a controlled delay is required before triggering an action, such as tripping a circuit or activating a device.

Other options, while relevant in electrical and safety applications, do not pertain to the specific function of time control using oil flow. For instance, fuses are designed for overcurrent protection, shunt trip circuit breakers are used for remote tripping through an external circuit, and full wave rectifiers are involved in converting alternating current (AC) to direct current (DC). None of these directly utilize oil flow for timing control, which is why dashpots are the correct choice.