Data Center Certified Associate (DCCA) Practice Exam

Direct digital control primarily relies on which type of controllers?

Hydraulic controllers Relay-based controllers Electronic controllers Pneumatic controllers

Correct Answer:

Electronic controllers

Explanation:

Direct digital control hinges on processing control tasks in digital form using electronic controllers. An electronic controller, such as a PLC or microcontroller, samples sensor data, runs control software, and outputs commands to actuators. This digital processing allows programmable, precise, and repeatable control, plus easy data logging and network integration—hallmarks of DDC. Hydraulic or pneumatic controllers rely on fluid power and analog signals rather than computation, and relay-based control uses physical relays without software-driven control, so they don’t embody the digital processing at the heart of direct digital control.

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