Según OSHA, las herramientas y los aparatos portátiles no deben conectarse a tierra:
a. si tienen un sistema aprobado de doble aislamiento.
b. si van a desecharse. De otra manera, todas las herramientas y los aparatos portátiles siempre deben conectarse a tierra.
c. si tienen aislamiento.
d. si consumen menos de 10 amperios de corriente.
a. si tienen un sistema aprobado de doble aislamiento.
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The angle of a piping offset with a run of 9-1/2 inches and a set of 11 inches is _____ degrees.
a. 49 b. 51 c. 64 d. 87
Ground straps are used to:
A. Provide a return path to the battery between insulated components. B. Suppress electromagnetic induction. C. All of these choices. D. None of these choices.
What type of orbit do geostationary orbits use?
A. Equatorial orbit B. Polar orbit C. Inclined orbit D. Subsatellite orbit
Using a stretcher course and a rowlock course to form each step, how many standard-size bricks are needed to face the surfaces of a flight of 5 concrete stairs if each tread measures 12" deep by 40" wide? (Refer to the diagram on page 65 in the book.)
What will be an ideal response?