Describe a datum and how it is used.
What will be an ideal response?
A datum is a reference point, axis, or plane from which dimensions are located and essential information is derived. A datum may be a point, line, plane, cylinder, or other exact feature. Datums are used in design, manufacturing, CNC, and many other processes. Datums have indispensable roles to perform in geometric dimensioning and tolerancing.
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Refer to the figure. Determine the length of pipe J (c-c)
Fill in the blank(s) with the appropriate word(s).
____ is a water-based wood preservative that prevents decay from fungi and insects.
A. Bardac-treatment B. Alkaline Copper Quat C. Chromated Copper Arsenate D. Copper Azole
To prevent sparks that could ignite fuel, _____.
a. always wear rubber-soled shoes b. wipe the fuel nozzle with an antistatic cloth c. ground the fuel nozzle or funnel d. use a low fuel-flow rate
The internal piston in the reversing valve is moved from one side to the other by
A) A stepper motor B) Pressure difference C) Permanent magnets attached to the ends of the piston D) A gear motor