When a B/C analysis is conducted, the benefits and costs: (choose one)
(a) Must be expressed in terms of their present worth values
(b) Must be expressed in terms of their annual worth values
(c) Must be expressed in terms of their future worth values
(d) Can be expressed in terms of PW, AW, or FW
(d) Can be expressed in terms of PW, AW, or FW
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Answer the following statement(s) true (T) or false (F)
1. Reversing the motor with a VFD is as simple as inserting a selector switch between the DCM and digital input #2 terminals. 2. The relay outputs are similar to the auxiliary contacts on magnetic motor starters. 3. The main difference between the output relays of VFDs and auxiliary contacts of magnetic motor starters is that the user cannot define which operating parameter the relays are programmed to report. 4. The term commissioning simply means to put into service.
For low frequencies, the frequency response of a second order system predicts that the output will be out of phase from the input by
A. ?180° B. 0° C. 180° D. ?90° E. 90°
How was natural gas created?
A) Natural gas was created when the earth was formed B) Natural gas is a byproduct of refining oil C) Decomposition of organisms converted into gas through pressure and heat D) Chemicals are mixed in large gas generating plants that react to form natural gas
________ are used as the finish surface on concrete forms in residential and commercial work
A) Panel overlays B) Medium-density fiberboards C) Hardboards D) Veneers