If the output of an astable 555 timer is LOW for 45 ms and HIGH for 59 ms, the duty cycle is
A) 56.7% B) 77.4% C) 85% D) 67.8%
A
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Find the resultant of the three-force system shown in Figure 12.28 and locate it with respect to point A.
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The use of CFS, as an alternative to lumber, in load-bearing residential applications, has found favor in some warm, humid areas of United States because CFS is
A) more durable against termite and fungal attack. B) heavier, and hence stronger. C) lower in labor and installation cost. D) noncombustible. E) all of the above.
Which of the following statements regarding chillers is TRUE?
A) Dry (direct expansion) chillers require less refrigerant than do flooded chillers. B) Flooded chillers have less potential for freeze-ups than other chillers. C) Regional zone chillers are more cost-effective than centralized units. D) Top-loaded chillers do not use shell-and-tube arrangements.
What is the purpose of a charge controller in a battery backedup solar system?
What will be an ideal response?