Direct digital controls (DDC) operate by:
A) Turning relay coils on or off to complete circuits.
B) Providing a varying DC voltage in response to monitored conditions.
C) Processing electronic signals with a microprocessor.
D) Providing a modulating air pressure in response to monitored conditions.
C
You might also like to view...
¿Cuántos diodos se necesitan para formar un rectificador de puente?
a. Uno b. Dos c. Tres d. Cuatro
____________________ are preplaced filler metal used for the root pass when consistent, high-quality welds are required.
Fill in the blank(s) with the appropriate word(s).
What is an air conditioning system's capacity in tons, if the supply air is moving through the 12" x 24" main supply duct at a velocity of 400 ft/min?
What will be an ideal response?
The American Society of Mechanical Engineers document that governs sectioning techniques is ____.
A. ASME Y14.5 titled Multi and Sectional View Drawings. B. ASME Y14.3 titled Sectional View Drawings. C. ASME Y14.3 titled Multi View Drawings. D. ASME Y14.3 titled Multi and Sectional View Drawings. E. none of the above