In a ratio control system, how many variables are uncontrolled?
A. none
B. one
C. all but one
Answer: B
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Benjamin Franklin, in 1748, strung together several Leyden jars as ____ and called the array a “Battery”.
a. inverters b. transformers c. capacitors d. resistors
Why are heated diode leak detectors better than corona discharge leak detectors?
A) Heated diode leak detectors are less expensive to replace. B) Heated diode leak detectors use infrared lights in leak detection. C) Heated diode leak detectors can detect greater amounts of coolant. D) Heated diode leak detectors are not as prone to false alarms.
Wood shingle and shake roofing can be made from many species, but ____ is the most commonly available.
A. oak B. maple C. pine D. cedar
For the protection of a worker on a scaffold, all planking should be overlapped at least ____ inches or otherwise secured from movement.
A. 8 B. 10 C. 12 D. 14