ACR-105 unit 16 test

The components that make up a basic control loop are the _________.

• controller and the device being controlled

• pneumatic controls and the direct digital controls (DDCs)

• pneumatic controls and the sensors

• sensor, controller, and the device being controlled

The _________ is the device that responds to a change in temperature, air velocity, humidity, water level or pressure.

• controller

• diaphragm

• sensor

• thermometer

In a pneumatic control system, the control signal is ________.

• heat

• air

• AC control voltage

• DC voltage

The term used to describe the sensitivity of a control, such as how much change in output signal per degree of temperature change, is called ________.

• flow modulation

• temperature swing

• overshoot

• gain

Pneumatic control components can include thermostats, humidistats, pressure controls, relays, and switches.

• True

• False

A signal converter is used to convert ____________ signals.

• analog to digital or digital to analog

• variable frequency to single frequency

• pneumatic to electromechanical

• DC to AC or AC to DC

A control loop contains a controller, a sensor, and a control device.

• True

• False

Pneumatic controls are operated by

• water.

• electricity.

• electronics.

• air.

One advantage of a modern control system is

• simplicity.

• faster response.

• ability to modulate.

• that they are less expensive.

Pneumatic air must

• be clean and dry.

• have very high pressure.

• encompass a large volume.

• be hot.