Good grounding in a substation yard is essential in order for relays to be activated to open switchgears during ground faults.
True or False?
The Guidebook for Linemen and Cablemen 2nd Ed. Textbook, Chap. 4, Pg. 120, “Switchgear,” Paragraph 1, Sentence 3
True
To reduce the risk of shifting in substation foundations, topsoil and clay are removed and replaced with ____.
a. crushed rock
b. sandy loam
c. stabilizing backfill
d. washed gravel
Reference: Site Layout and Preparation, “Site Preparation,” Paragraphs 1 and 2
c. stabilizing backfill
The ideal location for a substation is ____, but out of public view.
a. by the generating facilities
b. close to the load center
c. in an area with high soil resistance
d. near transmission line corridors
Reference: Site Layout and Preparation, “Site Considerations,” Paragraph 1, Bullet 1
b. close to the load center
If the substation site had been used as a dumping ground, buried materials and toxic waste can be left in place if the proper compaction of the site is carried out.
True or False?
Reference: Site Layout and Preparation, “Site Considerations,” Paragraph 1, Sentence 3
False
The effects of electromagnetic fields on livestock and people have been disproved and are of no concern when picking a site for a future substation.
True or False?
Reference: Site Layout and Preparation, “Site Considerations,” Paragraph 1, Bullet 4
False
When an engineer plans for stormwater drainage or the flow of oil released accidentally, he or she will refer to a ____ map.
a. construction strip
b. plan and profile
c. topographical
d. vicinity
Reference: Site Layout and Preparation, Figure 1, Caption
c. topographical
Soil resistivity is a factor in site selection because soil with a high resistance may require compensation measures so that the ____.
a. equipment and structure footings do not shift
b. fill compaction is adequate
c. ground grid operates properly
d. site drainage is effective
Reference: Site Layout and Preparation, “Site Considerations,” Paragraph 1, Bullet 6
c. ground grid operates properly
Soil that is brought in to be used as fill material is referred to as ____.
a. borrow
b. muck
c. slag
d. spoils
Reference: Site Layout and Preparation, “Site Preparation,” Paragraph 2, Sentence 1
a. borrow
Fill areas should be compacted in eight-inch layers to ____ of the maximum density as mandated by ASSHTO Standard T180.
a. 66 ⅔%
b. 75%
c. 95%
d. 100%
Reference: Site Layout and Preparation, “Site Preparation,” Paragraph 2, Last Sentence
c. 95%
The definition of the term soil ____ is to mechanically increase the density of the soil.
a. compaction
b. compression
c. condensing
d. packing
Reference: Site Layout and Preparation, “Compaction,” Paragraph 1, Sentence 2
a. compaction
By mechanically increasing the density of the soil, swelling and contraction with the seasons are reduced.
True or False?
Reference: Site Layout and Preparation, “Compaction,” Paragraph 1, Bullet 4
True
Increasing soil density by putting particles in motion and moving them closer together is the ____ method.
a. impact
b. kneading
c. pressure
d. vibration
Reference: Site Layout and Preparation, “Compaction,” Paragraph 3, Last Sentence
d. vibration
The four types of compaction are further divided into two basic types. These basic types are the ____ type and the vibratory type.
a. force
b. load
c. power
d. static
Reference: Site Layout and Preparation, “Compaction,” Paragraph 3, Sentence 1
d. static
In soil with too much moisture, the particles cannot move past each other, resulting in inadequate compaction.
True or False?
Reference: Site Layout and Preparation, “Compaction,” Paragraph 4, Sentence 5
False
Soils should never be over-compacted because it results in a weaker soil layer.
True or False?
Reference: Site Layout and Preparation, “Compaction Equipment,” Paragraph 1, Last Sentence
True
Rammers cover three types of compaction and operate within a range of ____ blows per minute.
a. 60 to 120
b. 120 to 240
c. 240 to 460
d. 500 to 750
Reference: Site Layout and Preparation, “Rammers,” Paragraph 1, Last Sentence
d. 500 to 750
Trenches are generally compacted using ____.
a. drum rollers
b. rammers
c. vibratory plates
d. wheel rollers
Reference: Site Layout and Preparation, “Rammers,” Paragraph 1, Sentence 1
b. rammers
For large areas, ____ are the most common type of compaction equipment used.
a. graders
b. rollers
c. tampers
d. vibratory plates
Reference: Site Layout and Preparation, “Rollers,” Paragraph 1, Sentence 1
b. rollers
A substation worker does not need to be able to spot site weaknesses that could cause problems in the future.
True or False?
Reference: Site Layout and Preparation, “Conclusion,” Paragraph 1, Sentence 4
False
A soil type with cohesive properties is ____.
a. angular gravel
b. caliche
c. clay
d. loam
Reference: Site Layout and Preparation, “Compaction Equipment,” Paragraph 1, Bullet 1, Sentence 1
c. clay
