When circuit breakers are installed in Class I locations, they must be ____.

A. dustproof
B. dust-ignitionproof
C. explosionproof
D. waterproof


Answer: C

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¿Cuántas bandas se necesitarían para sujetar una lámina de revestimiento de 120 pies (36,576 m) de tubería si las bandas fueran a a instalarse en centros de 9 pulgadas? (22,860 cm)

a. 120 b. 90 c. 160 d. 240

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Lumber used for structural framing of buildings in North America is generally derived

A) from hardwood species. B) from softwood species. C) from both softwoods and hardwoods, depending on the price of lumber. D) from both softwoods and hardwoods, depending on the time of the year.

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In a load of 10 cubic meters of topsoil, approximately how many cubic meters of the volume would be solid material?

A) 7.5 B) 1 C) 5 D) 4 E) 2.5

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Technician A says that disc brake pads should be replaced when worn to the thickness of the steel backing. Technician B says the pads should be removed and inspected whenever there is a brake performance complaint. Which technician is correct?

A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B

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