Two types of gases that tend to concentrate in and along low areas are _____
a. acetylene and propylene
b. methane and butane
c. propylene and propane
d. butane and propane
c. propylene and propane
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Which of the following is a probable cause of relay-controlled equipment failing to start when the contactor is closed?
a. excessive residual magnetism b. one contact not closing c. a grounded coil d. gummy deposits
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Any reversed flow of used or nonpotable water into the potable water distribution system is called _____
a. backflow b. backwash c. contamination d. coagulation
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The programmable element in a PAL is called a ________
Fill in the blank(s) with correct word
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A set of construction documents that show how the construction was actually performed are known by the name _____________________.