If a boiler will be subjected to freezing temperatures during an extended shutdown, it is normally placed in _____.
a. wet storage
b. either dry or wet storage
c. dry storage
d. dry storage and kept warm by heaters
c. dry storage
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For the AFD operating frequency range shown in Figure 4, the range of output frequencies over which the AFD output voltage remains constant while the frequency varies is identified in the figure as _____.
a. A to C
b. D
c. B to C
d. A to B
In a capacitive AC circuit, the phase relationship between the voltage and the current is such that the:
A) current is leading the voltage. B) voltage is 360 degrees out of phase with current. C) voltage is leading the current. D) current is 180 degrees out of phase with voltage.
The PDF fie is a ___________ which means drawings cannot be changed with thus format.
A. public data file B. read-only C. project data format D. portable document format
When troubleshooting a gas furnace, the technician reads 24 volts at the gas valve solenoid coil, but there is no burner during a call for heat. What is the most likely cause?
A. defective room thermostat B. defective limit switch C. defective gas valve D. defective induced draft motor