A drafting department supervisor estimates that 575 hours of drafting will be spent during a specific month. In fact, 610 hours are logged for that month. Find the percent to the nearest tenth percent accuracy of the estimate.

What will be an ideal response?


6.1%

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Gasoline is obtained from crude oil by a process called ____________________, which is based on the fact that each hydrocarbon boils or vaporizes within a certain temperature range.

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

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All refrigerants with a three-digit number starting with the number 4 are:

A) Compounds. B) Zeotropic blends. C) Refrigerant blends. D) Refrigerant effects.

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A relay is a device that ________

A) isolates the actuating signal from the control signal B) uses an electromagnet to open and close contacts C) has a coil to actuate some contacts that control other circuits D) all of these

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?What is different about the collector circulator for drainback-protected systems as compared with that of antifreeze-protected systems?

A. ?It only needs a single circulator as opposed to two circulators. B. ?It must not allow air bubbles to be entrained in the return piping. C. ?It must lift water from the static water level in the tank to the top of the collector array. D. ?It must have potential for overcoming increased frictional head loss in the collector piping.

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