A lightning protection device that is grounded at one end, with the other end close to but not touching the object to be protected, is called a lightning _____.
A. arrestor
B. catcher
C. umbrella
D. rod
Answer: A
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Water being used and recycled again and again is _____
A) carcinogenic B) the hydrological cycle C) the aqua cycle D) the sediment cycle
Which of the following statements is true for a delta-connected three-phase system?
A. Line current is higher than phase current by a factor of 1.732. B. Phase current is higher than line current by a factor of 1.732. C. Line current is less than phase current by a factor of 1.732. D. Line current and phase current are equal.
Joints in PVC may be made by using
A. soldering B. brazing C. lead and oakum D. solvent cement
Answer the following statements true (T) or false (F)
1. Soil and rock consist essentially of the same matter. 2. Cohesive soils are those in which the dry soil particles tend to separate from each other when mixed with a small amount of water. 3. If the bearing capacity of the soil is high, the footing area required is large. 4. The building codes do not mandate geotechnical investigations for all building construction sites. 5. A raft foundation is a shallow foundation system.