Inquiry-class ships featured the saucer section / engineering section / warp nacelle layout common to most Starfleet vessels. The class contained two variations of warp nacelles. (PIC: "Et in Arcadia Ego, Part 2")

As of 2399, Inquiry-class ships were the fastest and most tactically capable ships in the Federation fleet. They were equipped with phasers and deflector shields.

The Inquiry class was identified by name by Michael Chabon. He identified the class as "a heavy cruiser: the Inquiry-class. That's the Zheng He." Originally, when asked by fans on his Instagram account, he identified the USS Zheng He as a Curiosity-class ship, but he later amended the classification of the ship. [​1]