Direct Digital Control Concepts

Front

DDC stands for Direct _______ Control?

Back

Digital

Front

In an open loop control system, where is the input device located?

Back

Outside the controlled space

Front

In a closed loop system, does the input sensor directly measure and/or affect the output of the system?

Back

yes

Front

What are the components listed? Options: controllers, transmitters, inputs, outputs

Back

inputs

Front

Which of the following is an OUTPUT: occupancy sensor, Damper actuator, terminal block, GPC (general purpose controller)?

Back

Damper actuator

Front

This type of signal has very precise, set changes in voltage, like steps

Back

digital

Front

This type of signal is more fluid, a continuous wave that varies from one second to the next

Back

analog

Front

_______ is a device that converts AC voltage to DC voltage

Back

Rectifier

Front

________ is a device that converts DC voltage to AC voltage

Back

Inverter

Front

_______ is a device that changes the frequency of the AC voltage sine wave

Back

VFD