Lesson 7 Flashcards
A rubber line hose is used to protect Qualified Electrical Workers from accidental electrical contacts.
Select one:
True
False
True
All line hoses should be ? .
Select one:
a. cleaned and inspected regularly
b. kept clean and lubricated
c. stored in a metal cylinder
d. tested for insulation integrity every 6 months
a. cleaned and inspected regularly
Line hose is available in varying lengths and in diameters ranging from 1” to ? .
Select one:
a. 1 1/4”
b. 1 1/2”
c. 2”
d. 2 1/2”
b. 1 1/2”
Rubber blankets are the only things used to cover insulators.
Select one:
True
False
False
A conductor cover, fabricated from high-dielectric polyethylene, clips on and covers conductors up to ? in diameter.
Select one:
a. 1”
b. 2”
c. 3”
d. 4”
b. 2”
To prevent tie wires from contacting the crossarm when conductors are being tied or untied, ? are used.
Select one:
a. doubled-up rubber blankets
b. flattened-out rubber line hoses
c. high-dielectric-strength polyethylene crossarm covers
d. hot-line holding tools
c. high-dielectric-strength polyethylene crossarm covers
How should rubber blankets be stored when on the truck?
Select one:
a. Folded in a bin
b. Hung up in the bed of truck
c. In PCV tubes or a canvas bag
d. Thrown in a bin on the truck
c. In PCV tubes or a canvas bag
Odd-shaped conductors and equipment can usually be covered best with a rubber insulating blanket.
Select one:
True
False
True
A line hose provides Qualified Electrical Workers ? when used on energized conductors.
Select one:
a. a place to lie across to work on an outside phase
b. a margin of safety, for error without injury
c. a safe barrier against grounding themselves
d. the right to break the minimum approach distance of phase-phase conductors
b. a margin of safety, for error without injury
All rubber insulating protective equipment must be treated with care, kept clean, and ? .
Select one:
a. air dried when cleaned
b. inspected at regular intervals
c. stored out of the environment in metal cylinders
d. tested monthly
b. inspected at regular intervals
New rubber goods issued to a Qualified Electrical Worker can be assumed to be in good condition.
Select one:
True Incorrect
False
False
Rubber protective line hose provides the Qualified Electrical Worker an absolute barrier against injury while working on energized conductors.
Select one:
True
False
False
The use of the protective equipment should be ? , along with all other aspects of hot-line work.
Select one:
a. carefully planned
b. discussed at the morning briefing
c. regarded casually
d. second nature to the Qualified Electrical Worker
a. carefully planned
Ozone is created by ? from the oxygen in the air, generally in quite low concentrations, but enough to damage rubber over time.
Select one:
a. moisture
b. static electricity
c. sunlight
d. ultra violet rays
c. sunlight
A natural enemy of rubber that can be removed by hot, soapy water is ? or grease.
Select one:
a. corona
b. creosote
c. oil
d. ozone
c. oil
A luminous discharge due to ionization of air surrounding an electrical conductor with a voltage gradient exceeding a certain critical value is called ? .
Select one:
a. arc flashing
b. corona
c. flashing over
d. radiation exposure
b. corona
The strain or elongation of rubber is caused any time the rubber is distorted from its natural shape.
Select one:
True
False
True
Two things that contribute to ozone cutting damage of rubber are misapplication and improper ? .
Select one:
a. cleaning
b. handling
c. storage
d. testing
c. storage
The highest maximum use voltage for rubber insulating equipment for a phase-to-ground exposure is ? .
Select one:
a. 16 kV
b. 26 kV
c. 36 kV
d. 46 kV
c. 36 kV
A second point of contact is the point ? .
Select one:
a. during the contact when equal potential grounding reduces the current value to zero
b. when protective equipment opens the circuit
c. where current leaves the body if contact is made with a hot circuit
d. where grounds are attached to the neutral
c. where current leaves the body if contact is made with a hot circuit
The most common live-line work method on distribution voltages in the electrical industry is the ? method.
Select one:
a. bare hand
b. hot stick
c. PPG
d. rubber glove
d. rubber glove
A rubber blanket rated for 20,000 volts is placed over a line hose that is also rated at 20,000 volts. This combination of protective equipment has an insulating value of ? .
Select one:
a. 20,000 V
b. 30,000 V
c. 40,000 V
d. 60,000 V
a. 20,000 V
The minimum distance between the cuff of a class 2 rubber glove and the cuff of the leather protector is ? .
Select one:
a. 1”
b. 2”
c. 3”
d. 4”
b. 2”
