Elements with five, six, or seven electrons in their outermost ring are classified as ____.
a. metals
b. unstable
c. nonmetals
d. molecules
c. nonmetals
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Most reciprocating compressors operate with an oil pressure of ____.
a. 15 to 25 psi b. 25 to 35 psi c. 35 to 45 psi d. 45 to 55 psi
Newly placed conventional concrete must be kept moist for five to seven days so that it will _____.
a. cure b. settle c. mature d. segregate
When three transformers are connected with their primary windings in delta and their secondary windings in delta, the total connection is called a(n) ____________________ connection.
Fill in the blank(s) with the appropriate word(s).
When the rate at which a circulator adds head to the fluid in a piping system equals the rate at which the piping system dissipates this head, the system is in hydraulic equilibrium, and flow rate will ____.
a. remain constant b. steadily increase c. occasionally decrease d. fluctuate only slightly