La puesta a tierra y unión se tratan en el:
a. Artículo 250 del NEC®.
b. Artículo 308 del NEC®.
c. Artículo 110 del NEC®.
d. Artículo 501 del NEC®.
a. Artículo 250 del NEC®.
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A half-wave voltage doubler is made up of
A) two diodes and two capacitors B) one diode and two capacitors C) two diodes and one capacitor D) one diode and one capacitor
When doing a water system balance, how should the final water flow rate at all units be set?
a. 100 percent of design flow b. Within +/-10 percent of design flow c. 105 percent of design flow d. Above 85 percent of design flow
Identify the order of the steps for the general lockout/tagout procedure:
____ Isolate and de-energize all sources of energy to the equipment. ____ Confirm isolation with maintenance and add maintenance tags. ____ Stop the equipment. ____ Tag the start/stop station. ____ Isolate the equipment (in other words, block, tag, and lock all process lines). ____ Centralize the isolation keys in an area with restricted access (for example, a lockout/tagout lockbox).
In cold climates, the topmost portion of a vent terminal should be enlarged to prevent _____.
a. back pressure b. frost buildup c. sewer-gas blowback d. contraction cracking