Sketch the current through the load Ro in the switched-mode power supply of Figure P12.32.


When A or B has a high level voltage, it works as a short-loop; when A or B has a low level voltage, it works as a open-loop. The current waveform of the load is as the below:

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A company that manufactures purgeable hydrogen sulfide monitors will make deposits such that each one is 7% larger than the preceding one. How large must the first deposit at the end of year 1 be if the deposits extend through year 10 and the fourth deposit is $5550? Use an interest rate of 10% per year.

What will be an ideal response?

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Which of the following will increase the evaporation (E) from the soil surface?

A) the use of no-till culture B) plastic mulch C) adding straw mulch to the soil surface D) stubble mulch farming E) none of the above

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Which organizations offer updated training for technicians?

A) Aftermarket part suppliers B) ASA C) IATN D) All of these

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a. Natural-draft b. Induced-draft c. Condensing d. Mid-efficiency

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