When an ac voltage is supplied to an RL circuit, the ac's current and amplitude will be:

A) lagging the voltage. B) varying in the same manner.
C) similar in waveform. D) all of these.


D

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Grass clippings from a healthy lawn can be expected to contain approximately ________ % N (on a dry weight basis)

A) 0.5 B) 7.5 C) 3.0 D) 0.01 E) 0.2

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When brazing on refrigeration line with an attached service valve:

A) The line should be attached with quick setting cement instead of brazed. B) The joint should be heated slowly to prevent overheating the valve. C) The joint should be heated quickly to avoid overheating the valve. D) The valve should be cut out of the system prior to brazing to avoid overheating.

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Duty cycle is measured in ________ increments

A) 30 -minute B) 15-minute C) 10-minute D) 1-hour

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Standard water heaters typically have integrated insulation with an R-value of between ____, while very efficient heaters may have R-values as high as 24.

A. 6 and 12 B. 8 and 16 C. 9 and 18 D. 12 and 20

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