Las condiciones de servicio habituales de la NEMA incluyen una variación de voltaje de no más de _____ del voltaje nominal.
a. 0.02
b. 0.05
c. 0.1
d. 0.2
c. 0.1
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Which of these cannot be extruded?
a. line b. polysolid c. circle d. rectangle
In the formula for front-clearance-angle applications, angle ____________________ is the front clearance angle made with the vertical.
Fill in the blank(s) with the appropriate word(s).
When sheet metal straps are used to suspend fiberglass duct, what gauge and size of metal is required?
a. 22-gauge metal; 1" wide minimum b. 28-gauge metal; 1" wide minimum c. 22-gauge metal; 1-1/2" wide minimum d. 28-gauge metal; 1-1/2" wide minimum
Why can a compound gauge NOT indicate when a system is properly evacuated?
A) Compound gauges don't read vacuum. B) It can only show inches, and there are 25,400 microns in one inch. C) The Bourdon tube will suck completely flat. D) The gas volume in the Bourdon tube will prevent the system from pulling down.