To avoid electrical shock, what class fire extinguisher should be used on electrical equipment?

A) Class D B) Class B C) Class C D) Class A


C

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A(n) ____________________ is a refrigerated area that is conditioned by a mechanical refrigeration system.

Fill in the blank(s) with the appropriate word(s).

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Answer the following statement(s) true (T) or false (F)

If the total rise is 57” for a set of stairs the largest possible unit rise is 7 1/8”.

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False wipes in an automatic wiper system are usually the result of a foreign material on the windshield or from flaws in the windshield that interfere with the system optics.

Answer the following statement true (T) or false (F)

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The lens equation says that if an object is placed at a distance p from a lens, and an image is formed at a distance q from the lens, then the focal length f satisfies the equation 1/f = 1/p + 1/q. Assume that p = 2.3 ± 0.2 cm and q = 3.1 ± 0.2 cm.

a. Estimate f, and find the uncertainty in the estimate. b. Which would provide a greater reduction in the uncertainty in f: reducing the uncertainty in p to 0.1 cm or reducing the uncertainty in q to 0.1 cm?

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