Electric squibs, also known as propellant-actuated devices, are similar to which of the following?

Electric squibs, which are also known as propellant-actuated devices, are indeed similar to blasting caps. Both electric squibs and blasting caps function by providing a means to initiate a reaction that leads to an explosive event. Blasting caps are specifically designed to detonate explosives by producing a shock wave that triggers a larger explosion, while electric squibs use electrical energy to ignite a small charge, often leading to the ignition of propellant. This similarity lies in their purpose of initiating reactions within munitions systems.

The other options, while they may have similarities with electric squibs, do not align as closely in function. Electric detonators, for instance, are specifically crafted for initiating explosives but tend to be more complex than electric squibs. Fuse ignitors typically work through a mechanical system rather than an electric one, and shock tubes involve a different method of ignition using a shock wave rather than an electrical current. Hence, the parallel between electric squibs and blasting caps is established primarily through their roles in the detonation process within munitions.