The tight bond between the refrigerant tube and the fins on tube-and-fin coils is made by:
A) Glueing the fins to the tubing.
B) Soldering the fins to the tubing.
C) Machining the fins and tubing out of a single piece of solid metal.
D) Expanding the tubing into the fins.
D
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A machine tool purchased 2 years ago for $40,000 has a market value best described by the relation $40,000 ? 3000k, where k is the number of years from time of purchase. Experience with this type of asset has shown that its annual operating cost is described by the relation $30,000 + 1000k. The asset’s salvage value was originally estimated to be $10,000 after a predicted 10-year useful life. Determine the current estimates for P, S, and AOC for a replacement study, assuming it will be kept only 1 more year, which will be the third year of ownership.
What will be an ideal response?
What is the frequency, in units of Hertz, of the ac signal: 2 sin (5t) V?
A. 10? B. 5/(2?) C. 5 D. 5/? E. 5?
When installing electric furnaces, all aspects of the power wiring circuit are crucial because
A) Of the high current draw of electric furnaces B) The higher voltage that is supplied to electric furnaces C) The sensitivity of the delicate electronic controls used to control electric heating elements D) The intolerance of electric heating elements to voltage variation
Which of the following statements is true for a delta-connected three-phase system?
A. Line current is higher than phase current by a factor of 1.732. B. Phase current is higher than line current by a factor of 1.732. C. Line current is less than phase current by a factor of 1.732. D. Line current and phase current are equal.