Conductors on overhead lines are electrically insulated from the ground by either resting on insulators or being ____.
a. bonded to the structure
b. detached from the surface
c. shunted to the surface
d. suspended from insulators
Reference: Insulators – Types and Installation, “Introduction,” Paragraph 2, Sentences 1-2
The Guidebook for Linemen and Cablemen 2nd Ed. Textbook, Chap. 8, Pg. 258
d. suspended from insulators
Three materials used for overhead line insulators are porcelain, polymer, and ____.
a. fiberglass
b. glass
c. glass-lined wood
d. nylon-reinforced plastic
The Guidebook for Linemen and Cablemen 2nd Ed. Textbook, Chap. 8, Pg. 258
b. glass
If three phases and a neutral are mounted on a crossarm, the neutral can be identified as it is the one mounted on a ____ insulator.
a. ceramic
b. glass
c. polymer
d. porcelain blend
The Guidebook for Linemen and Cablemen 2nd Ed. Textbook, Chap. 8, Pg. 258
b. glass
A combination of dirt and moisture will cause insulators to flash over; ____ is/are also a likely cause.
a. age
b. hail storms
c. lightning
d. loose conductors
The Guidebook for Linemen and Cablemen 2nd Ed. Textbook, Chap. 8, Pg. 260
c. lightning
The glaze on a porcelain insulator helps the insulator’s surface shed dirt and bead water.
True or False?
The Guidebook for Linemen and Cablemen 2nd Ed. Textbook, Chap. 8, Pg. 259
True
Pin-type insulators can be two or more pieces cemented together.
True or False?
Reference: Insulators – Types and Installation, “Introduction,” Paragraph 2, Sentence 4
The Guidebook for Linemen and Cablemen 2nd Ed. Textbook, Chap. 8, Pg. 260
True
A one-piece insulator can withstand a higher voltage than a two-piece insulator.
True or False?
Reference: Insulators – Types and Installation, “Introduction,” Paragraph 2, Sentences 3-4
The Guidebook for Linemen and Cablemen 2nd Ed. Textbook, Chap. 8, Pg. 260
False
Hand wire ties or ____ ties are used to fasten a conductor on most top tie insulators.
a. insulated
b. non-conductive
c. preformed
d. shoe type
The Guidebook for Linemen and Cablemen 2nd Ed. Textbook, Chap. 8, Pg. 260
c. preformed
Each disk of a porcelain or glass suspension insulator is rated at ____.
a. 6 kV
b. 11 kV
c. 15 kV
d. 18 kV
The Guidebook for Linemen and Cablemen 2nd Ed. Textbook, Chap. 8, Pg. 261
b. 11 kV
A porcelain suspension insulator uses a ball-and-socket design which puts the insulating material under ____ to create strength.
a. compression
b. several layers of steel and porcelain
c. strain
d. tension
The Guidebook for Linemen and Cablemen 2nd Ed. Textbook, Chap. 8, Pg. 261
a. compression
One piece porcelain pin-type insulators are used on lines where the voltages are less than ____.
a. 23 kV
b. 32 kV
c. 45 kV
d. 69 kV
Reference: Insulators – Types and Installation, “Introduction,” Paragraph 2, Sentence 3
The Guidebook for Linemen and Cablemen 2nd Ed. Textbook, Chap. 8, Pg. 260
a. 23 kV
A polymer suspension insulator cannot withstand the tension of deadend conductors.
True or False?
Reference: Insulators – Types and Installation, “Introduction,” Paragraph 4, Sentence 1
The Guidebook for Linemen and Cablemen 2nd Ed. Textbook, Chap. 8, Pg. 259
False
Pin insulators are no longer used on transmission lines.
True or False?
Reference: Insulators – Types and Installation, “Introduction,” Paragraph 2, Sentence 5
The Guidebook for Linemen and Cablemen 2nd Ed. Textbook, Chap. 8, Pg. 260
True
If a suspension insulator string is made up of 50 kip insulators, the insulator string is able to withstand ____ of tension.
a. 50,000 lbs
b. 60,000 lbs
c. 70,000 lbs
d. 80,000 lbs
The Guidebook for Linemen and Cablemen 2nd Ed. Textbook, Chap. 8, Pg. 261
a. 50,000 lbs
Post insulators are positioned on a pole to support conductors in a vertical or horizontal ____ position.
a. cantilevered
b. offset
c. tension
d. upright
The Guidebook for Linemen and Cablemen 2nd Ed. Textbook, Chap. 8, Pg. 262
a. cantilevered
Post insulators are most likely to be found when a line is built on a ____ or along a highway.
a. city street
b. hill with downward pressure on the insulators
c. narrow right-of-way
d. rural wide right-of-way
The Guidebook for Linemen and Cablemen 2nd Ed. Textbook, Chap. 8, Pg. 286
c. narrow right-of-way
When hoisting a long string of insulators, care should be taken not to ____ because it can damage the ball, socket, and cotter keys.
a. excessively bend the string
b. send up the entire string
c. split the string
d. tie the rope to the insulators
The Guidebook for Linemen and Cablemen 2nd Ed. Textbook, Chap. 8, Pg. 287
a. excessively bend the string
Polymer insulators are light weight but do not maintain high dielectric or mechanical strength.
True or False?
Reference: Insulators – Types and Installation, “Introduction,” Paragraph 4, Sentence 1
The Guidebook for Linemen and Cablemen 2nd Ed. Textbook, Chap. 8, Pg. 259
False
It is acceptable to climb down a polymer insulator to the conductor level on a transmission line.
True or False?
The Guidebook for Linemen and Cablemen 2nd Ed. Textbook, Chap. 8, Pg. 288
False
A 240-kilovolt suspension insulator string is likely to have ____ porcelain insulators.
a. 8
b. 10
c. 14
d. 18
The Guidebook for Linemen and Cablemen 2nd Ed. Textbook, Chap. 8, Pg. 261
c. 14
A 69-kilovolt suspension insulator string is likely to have ____ porcelain insulators.
a. 2 or 3
b. 3 or 4
c. 4 or 5
d. 5 or 7
The Guidebook for Linemen and Cablemen 2nd Ed. Textbook, Chap. 8, Pg. 258
c. 4 or 5
The diameter of suspension porcelain insulator disks varies from 3 ⅜ to ____.
a. 8 ½”
b. 10”
c. 11 ½”
d. 12”
Reference: Insulators – Types and Installation, “Introduction,” Paragraph 3, Sentence 3
c. 11 ½”
