2-5-3 Flashcards
There are __?__ shapes of stranded conductors most common used in cable.
5
There is no such type stranded conductor used in cables as an annular conductor; this is strictly an overhead type.
false
The advantages of using a compact round conductor instead of a concentric round conductor are that the compact has a smaller outside diameter and the cable will __?__ than the concentric round.
weigh less
The three main categories of cable insulation include thermosetting, thermoplastic, and __?__.
laminated
One advantage of impregnated paper insulation is that it has good frequency stability.
false
Another advantage of impregnated paper insulation is that it has good electrical properties such as high dielectric strength, low power factor, and low __?__.
dielectric loss
The ratio of capacitance is the ability of material to hold a charge compared to the capacitance of __?__.
air
The __?__ is the ratio of capacitance on two conducting surfaces with air as the dielectric insulating material used between the surfaces.
dielectric constant
There are __?__ types of extruded insulation used in cable manufacturing listed in the reference materials.
8
Cross-linked polyethylene insulation has a superior resistance to heat deformation and environmental stress cracking.
true
The tape used for the insulation of metallic shield can also be used as a ground to carry a potential fault current.
false
The purpose of the metallic shield is to __?__ inside the cable.
contain and equalize the electrical field
The electrical grounding braid used to ground a splice or termination has a high current carrying capacity equal to that of a # __?__ AWG wire.
6
The purpose of the __?__ is to provide mechanical protection and, in some cases, electrical protection: a path for current return.
cable jacketing
The advantage of using lead sheathing is that it is the most effective protection for insulation against moisture, weather, and __?__.
oxidiation
The cable cleaning kit used to clean the insulation of the solid dielectric cable will help prevent tracking on the insulation and also leaves a tacky surface to help secure the semi-conductor tape which is applied on the insulation after it has been cleaned.
false
Calipers used in cable splicing measure the __?__ thickness.
insulation
A knife is a tool frequently used by a cable splicer, one job that can be performed with a knife is cutting and penciling the insulation.
true
The cable metallic shielding can be soldered using an electric soldering iron, soldering tips, or a __?__ soldering iron.
propane
You should always use a lead pencil when marking your cable because the lead in a lead pencil is very conductive and will help make a better splice.
false
A small __?__ can be used in preparing a cable end because it will allow you to make a straight cut on the insulation and you can control how deep your blade is cutting.
tubing cutter
To ring cut the cable insulation and help prevent damaging the cable conductor, you can use a piece of __?__.
cotton string
When using a torch for shrinking a heat shrink termination or splice, the flame should be adjusted to provide an overall __?__ inch bushy flame. Use the yellow tip for shrinking.
12
Electric cords used on the job must be of the three-prong type.
true
Live-line tools used for primary employee protection must be removed from service every __?__ years, or whenever a defect is discovered, for examination, cleaning, repair, and testing.
2
