Which of the following is NOT a type of meter movement that can measure either DC or AC?

The moving-coil type of meter movement is specifically designed to measure DC (Direct Current) only. It operates based on the interaction between a magnetic field and a current-carrying coil, which causes the coil to rotate and indicate a measurement on a scale. This design does not function effectively for AC (Alternating Current) since the direction of the current changes periodically, resulting in an average reading of zero if AC were applied directly to a moving-coil meter.

In contrast, electrodynamic and hot-wire meters can measure both AC and DC. The electrodynamic meter uses a similar principle to the moving-coil meter but incorporates a second coil that allows it to measure AC by responding to the average value of the current flow. The hot-wire meter also measures the heating effect of current, allowing it to effectively respond to both AC and DC currents.

The moving-vane meter can also work with both types of current because it relies on a different principle that allows it to respond to changes in the electric field, regardless of the current direction. Thus, moving-coil meters stand out as the type that only measures DC, making it the correct response for this question.