BDCMs have low maintenance requirements because they do not have brushes.
Answer the following statement true (T) or false (F)
True
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Atmospheric pressure changes with changes in elevation.
Answer the following statement true (T) or false (F)
What is the purpose of a steam turbine?
a. Produce high pressure steam. b. Produce low pressure steam. c. Provide rotational energy to a pump, compressor, or generator. d. Convert high pressure steam into condensate.
In an air-to-air heat pump, defrost is accomplished by _____.
a. placing the unit in the cooling mode b. using electric heaters to warm the outdoor coil c. running hot water over the outdoor coil d. using electric heaters to warm the indoor coil
Answer the following statement(s) true (T) or false (F)
1. The Underwriters Laboratories Inc. (UL) performs product safety tests and certifications for laboratory use only. 2. The EPA sets the standards for contaminant levels in our drinking water that are considered safe to drink. 3. The MCL is legally enforceable. 4. The MCLG is legally enforceable. 5. The source of outdoor air pollution (Figure 3.12) may be classified into three broad categories: the stationary sources, the mobile sources, and the natural sources.