There are aids to making original elementary diagrams and layouts more useful and to cutting maintenance and troubleshooting time. Numbering elementary circuit lines and ____________________ the relays and their contacts are two such aids.
Fill in the blank(s) with the appropriate word(s).
cross-referencing
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What branch of chemistry that studies the relationships among the physical properties of substances and their chemical compositions and transformations?
A) Organic chemistry B) Inorganic chemistry C) Physical chemistry D) Compound chemistry
According to the NEC®, neutral conductors size No. 6 and smaller must have a continuous marking of white or _____.
a. black b. yellow c. gray d. red
Answer the following statement(s) true (T) or false (F)
1. It is often necessary to determine the quantity of heat stored in a given amount of material that undergoes a specific temperature change. An equation known as the sensible heat quantity equation, can be used for this purpose. 2. The quantity of heat absorbed or released from the material is expressed as Btu/hr. 3. The rate of heat transfer into or out of the fluid stream in equations is expressed as Btu. 4. The vapor pressure of a liquid is the minimum pressure that must be applied at the liquid’s surface to prevent it from boiling. 5. When hydronic systems are first filled with water, dissolved air is present in the water throughout the system.
Using the method of proof by perfect induction, show that
