Corridor lighting levels in the public areas of a building should have at least _____.
a. the same illuminance level as the adjacent areas
b. 20% of the illuminance level of the adjacent areas
c. 50% of the illuminance level of the adjacent areas
d. 75% of the illuminance level of the adjacent areas
b. 20% of the illuminance level of the adjacent areas
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Answer the following statement(s) true (T) or false (F)
1. A 1:1 relation exists between the primary and the secondary coils of the isolation transformer. 2. The secondary of an isolation transformer is usually grounded. 3. The “hot” power line is staked at a permanent ground reference by the power company. 4. A primary protector is used to protect the main system from higher voltage lightning strikes or switching transients on the input side of the power line. 5. Motor-driven generators are able to provide DC-to-AC conversion.
_________________________ is the portion of the soil that includes animal and plant residues
Fill in the blank(s) with correct word
HVACR technicians should consider becoming involved in a trade association or with a student educational organization:
A) Because it will guarantee higher income. B) To secure a contractor's license. C) To ensure that they can pass required industry certifications. D) To develop business and technical contacts in the local HVACR industry.
Answer the following statement(s) true (T) or false (F)
1. If the sun is to be used as a timer, some type of photodetector will be required to sense when the sun rises and sets. 2. When the cad cell is in the presence of light, its resistance is high. 3. In the presence of darkness, the resistance of the cad cell increases in value. 4. When the voltage applied to the inverting input becomes higher than the voltage applied to the noninverting input, the output changes to a high state. 5. A DC motor contains brushes and a commutator.