________________ is a rapid change in direction and speed caused by obstacles in the wind’s path.

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


Turbulence

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Chilled water systems use a primary refrigerant to remove heat from a secondary refrigerant in a chiller unit. What is the secondary refrigerant in such systems?

A) R-22 B) Water C) R-134A D) Ammonia

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How many steps are required to calculate the heat necessary to change 10 lbs of ice at -20°F to steam at 250°F?

A) One B) Five C) Two D) Three

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Articles of cargo that are likely to roll must be restrained by:

A. chocks B. wedges C. a cradle D. any of the above

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For a ladder contacting the wall 20ft above the ground, the base should be ____ from the wall.

a. 6 ft b. 4 ft c. 3 ft d. 5 ft

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