Of what are the buried pipes usually made?
What will be an ideal response?
polyethylene or polybutylene
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The roof truss is bolted to a reinforced masonry pier at A and connected to an elastomeric pad at C. The pad, which can apply vertical restraint in either direction but no horizontal restraint, can be treated as a roller. The support at A can be treated as a pin. Compute the reactions at supports A and C produced by the wind load.
The time taken by an automobile mechanic to complete an oil change is random with mean 29.5 minutes and standard deviation 3 minutes.
a. What is the probability that 50 oil changes take more than 1500 minutes? b. What is the probability that a mechanic can complete 80 or more oil changes in 40 hours? c. The mechanic wants to reduce the mean time per oil change so that the probability is 0.99 that 80 or more oil changes can be completed in 40 hours. What does the mean time need to be? Assume the standard deviation remains 3 minutes.
In order to modulate the flow of supply air, VAV systems may use inlet guide vanes on the fan inlet or _____
a. hot gas bypass b. an economizer c. variable speed drives d. powered exhaust
Thyristor(s) with an anode gate is (are)
A) SCR. B) Triac. C) PUT. D) Diac. E) A and B