Before working on electrical equipment that has been locked and tagged out, a person should use a(n) ______________ to verify there isn't any potential voltage.
A. non-contact voltage detector
B. electric meter
C. infrared thermometer
D. none of the above
Answer: B
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Arch brick can be laid in several positions for semicircular arches.
Answer the following statement true (T) or false (F)
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What type of fitting allows four pipes to be connected together?
A. Tee B. Union C. Cross D. Nipple
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Which type of screwdriver should be used if there is limited space above the head of the fastener?
A) Impact screwdriver B) Robertson screwdriver C) Standard screwdriver D) Offset screwdriver
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Foaming on the water surface of a steam boiler is a condition caused by _____
a. salt and mineral deposits b. colloidal substances and/or electrolytes c. oil, grease, and/or sediment d. dissolved oxygen and amides
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