Las lámparas fluorescentes con un único terminal en cada extremo son lámparas de ________.
a. arranque instantáneo
b. arranque rápido
c. precalentamiento
d. alta luminosidad (HO)
a. arranque instantáneo
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¿Qué es un economizador?
a. Una válvula de combustible b. Un mezclador de aire c. Un precalentador para agua de alimentación de calderas d. Un recalentador para vapor
When both change and complexity are high, which of the following is true?
a. uncertainty is also high b. System 1 designs are best c. bureaucratic or mechanistic designs work best. d. All of these are correct. e. None of these are correct.
A large water utility is planning to upgrade its SCADA system for controlling well pumps, booster pumps, and disinfection equipment so that everything can be centrally controlled. Phase I will reduce labor and travel costs by $28,000 per year. Phase II will reduce costs by an additional $20,000 per year, that is, $48,000. Phase I savings should occur in years 0, 1, 2, and 3 and phase II savings should occur in years 4 through 10. Let i = 8% per year.
(a) Using a spreadsheet determine the present worth of the upgraded system for years 1 to 10. (b) The utility General Manager had hoped for a present worth of at least $400,000. Determine the interest rate at which this would be correct. What will be an ideal response?
The three essential requirements for a useful electric circuit are:
A) A magnetic field, a path for current flow, and a switch. B) A power source, a path for current flow, and a switch. C) A power source, a path for current flow, and an electrical load. D) A power source, a magnetic field, and a path for current flow.