The ____________ also allow the motor to soft start and to coast down without just shutting the motor off.
Fill in the blank(s) with the appropriate word(s).
VFD's
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A part made from annealed AISI 1018 steel undergoes a 20 percent cold-work operation. (a) Obtain the yield strength and ultimate strength before and after the cold-work operation. Determine the percent increase in each strength. (b) Determine the ratios of ultimate strength to yield strength before and after the cold-work operation. What does the result indicate about the change of ductility of the part?
What will be an ideal response?
The augers used for boring pier holes generally use
A) a hammering operation. B) a rotary operation with a helix-type blade cutter. C) a vibratory operation followed by a hammering operation. D) a rotary operation followed by a hammering operation. E) none of the above.
______________ is a step to implement a preventative maintenance program.
A. Training B. Documentation of activities C. Tracking results D. All answers are correct
Tankless water heaters do not store any hot water in reserve. Therefore, they:
A. require a gas system with larger diameter pipes or higher pressures. B. must convert fuel at a higher rate than storage tank models. C. A, B, and D D. must use heavier gauge wire or higher voltage.