A profile of a (n) ____________________ tolerance is a geometric tolerance that establishes a three-dimensional tolerance zone that extends along the length and width (or circumference) of the considered feature or features.
Fill in the blank(s) with the appropriate word(s).
ANS: surface
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En un circuito de atenuación diseñado correctamente utilizado con aparatos de iluminación HID,
a. la acción de atenuación ocurre inmediatamente después de la activación. b. la atenuación se demora hasta que la lámpara se haya calentado por completo. c. la iluminación producida por el accesorio siempre se reduce al 50% de su salida normal. d. NO es posible el uso de dos o más niveles de iluminación fijos.
Answer the following statement(s) true (T) or false (F)
1.When computing box fill, each 14 AWG lighting fixture wire counts as one conductor. 2.A wire that has its origin inside a device box and does not leave the device box, such as a pigtail, counts as one conductor when computing box fill. 3.When installing electrical boxes above a dropped ceiling, it is OK to have the boxes supported by the same wires that hold up the dropped ceiling. 4.Electricians usually choose square boxes as junction boxes because they can contain more conductors than a comparable octagon box. 5.The volume for a pancake box is durably and legibly marked on the box by the box manufacturer. 6.If a box has one or more securely installed barriers, the volume of the box must be apportioned to each of the resulting spaces.
In a parallel compressor system, oil often does not return at the same rate to all of the compressors because:
A) Only some of the compressors require oil return. B) All the compressors do not use the same type of refrigerant oil. C) All the compressors do not operate for the same length of time. D) Parallel compressors are normally stacked vertically, so most of the returning oil returns to the crankcase of the bottom compressor.
What is the color of the warning light that indicates hydraulic system failure?
A) Amber B) Yellow C) Red D) None of these