Which method enables ultraviolet (UV) lamps to be able to kill the maximum number of microbes in a duct
system?
a. Install UV lamps in the airstream ahead of an EAC.
b. Constantly bathe the evaporator coil with UV light.
c. Cycle the UV lamps on and off with the furnace blower.
d. Install UV lamps in the return air duct airstream.
b
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A contractor is likely to select and use a specific form system whenever possible because _____.
a. crews are trained in its use b. it is the most expensive c. it is readily available d. contracts require use of that system
Because the neutral wire is ____________________, it helps protect the three high-voltage primary windings from lightning surges.
Fill in the blank(s) with the appropriate word(s).
RC integrators can be used to convert a repetitive pulse waveform to a constant dc voltage equal to the average voltage of the waveform if:
A) ? is very small compared to tW. B) ? is very large compared to tW. C) ? is five times tW. D) ? is equal to tW.
The CTFS harmonic function of x(t) based on one fundamental period is found to be
(a) Is the signal even, odd or neither?
Since the harmonic function is purely real, the signal is even.
(b) What is the numerical average value of the signal?