13. How do most variable frequency drives operate?
What will be an ideal response?
Most variable frequency drives operate by first changing the AC voltage into DC and then changing it back to AC at the desired frequency.
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A tertiary witness to a workplace accident is one who:
A) Saw the accident but is not sure what happened or how B) Was involved in the accident but was not injured C) Heard the accident and turned to view it right after it happened D) Was not present at the accident but has knowledge pertinent to it
A(n)____ removes broken bolts.
A. tap B. impact wrench C. drill press D. screw extractor
All of the following are correct when a capital budgeting problem is solved using the 0-1 integer linear programming model, except: (choose one)
(a) Partial investment in a project is acceptable. (b) The objective is to maximize the present worth of the investments. (c) Budget constraints may be present for the first year only or for several years. (d) Contingent and dependent project restrictions may be considered.
Show that a system described by 
is time variant, BIBO unstable, causal, dynamic and noninvertible.
What will be an ideal response?