The purpose of the quartz sleeve in an ultraviolet-light system is to _____.
a. react chemically with the ultraviolet light to create chlorine ions
b. act as a water filter
c. prevent contaminants in the water from settling on the lamp and reducing its efficiency
d. prevent the water in the disinfecting chamber from cooling the lamp
d. prevent the water in the disinfecting chamber from cooling the lamp
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Which of the following most contributed to the anxieties of Greeks in the early Hellenistic Ages?
a. the increasing power of the polis b. the loss of religious belief c. life in insular communities with little outside influence d. the need to look after oneself, spiritually and materially
Which of the following terms is not used to describe an effective ground-fault current path?
A. Intentionally constructed B. Low-impedance C. 6 AWG or larger D. Continuous and reliable
Producing ice began over 3,000 years ago using the:
A) Mechanical vaporization method. B) Distillation method. C) Water evaporation method. D) Pressure-temperature method.
Motors that are intended to operate on two voltages such as 240 or 480 volts contain two separate ____________________ of each phase
Fill in the blank(s) with the appropriate word(s).