Q. Which gate is used in static relay?

The NAND Gate along with the NOT Gate AND Gate OR Gate and the NOR Gate are collectively referred to as the Universal Gates. As a result of their versatility and the existence of both npn and pnp varieties transistors are used in a wide variety of logic circuits. Resistor transistor logic (RTL) and direct coupled transistor logic are two types of transistor-based logic circuits that can be created (DCTL).