A current-limiting circuit breaker performs in a manner similar to conventional thermomagnetic circuit breakers at currents below a threshold of about _____.
a. 600A
b. 700A
c. 800A
d. 1,000A
d. 1,000A
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Which of the following statements is true for commercial installations of glass block?
A. Longer walls or panels of glass should not be laid to a line in mortar. B. Larger installations require that they be divided into a series of individual panels. C. Masons use a margin trowel on large commercial installations. D. Prepackaged mixes are the least expensive option for commercial jobs.
Autotransformer starters are ____________________ type loads and will affect the power factor during the starting period.
Fill in the blank(s) with the appropriate word(s).
Silicon is widely used as a semiconductor because it _____.
a. has no valence electrons b. has only one valence electron c. has a negative charge d. withstands heat
When written as production data, twins are coded as:
a. TR c. S b. Q d. TW