Why are direct digital control systems (DDC) sometimes referred to as energy management systems?
What will be an ideal response?
The DDC systems are often called energy management systems since one of their main functions, and usually justification for their adoption, is saving energy. Special provision has been made in the selection of sensors to make possible continuous monitoring of the energy usage. The control system is set up to energize loads only when necessary and to use such features as free cooling
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Fires that occur with flammable liquids, such as gasoline, oil, grease, paints, and thinners are Class __________ fires.
a. A b. B c. C d. D
Construct a 95% confidence interval for the population variance 
if a sample of size 25 has standard deviation s=15.
What will be an ideal response?
When first setting up a new communicating control system:
A) The technician enters the control code on each individual component access screen. B) The system automatically scans the network for connected devices. C) The technician must enter the communicating address and function of each component in the system. D) The technician must connect a laptop to each device in the network.
Construction traffic and loads should be kept off of a newly placed concrete slab until it has cured for at least _____ days.