Section #1-1B Flashcards
The most common frequency generated in the United States is 60 cycle
True
A generation station is a plant that changes fossil fuels, waterfall,or the atom into electrical energy
True
The generator transforms mechanical energy to electrical energy.
True
The power take off of a digger Derek is not placed near the operators platform. Name one other component control that is in an isolated location from the platform
Outrigger
A substation is an installation used to tie the generation system to the transmission system.
True
A good general rule for the transmission of power is to utilize a voltage value of 500 volts per mile.
False
The static wire of the transmission line serves the purpose of
Shielding the line from lightning
Voltages in the range of 138kv to 765kv are referred to as
Transmission
An electrical system used to connect the consumer to the high voltage system
Distribution system
The digger of a digger Derrick is connected mechanically to the source of power. Name the other component, which is connected mechanically
Winch
Most electric energy is generated at a voltage in the range of 13.2kv to 24kv
True
The devise used to bypass voltage surges to protect electrical equipment.
Arrestor
A fused devise used to protect electrical equipment
Cutout
A switch that is Not designed to open under load but used for the isolation of circuits or equipment only.
Disconnect switch
Low voltage wires extending from the last pole or transformer to the consumer is called a service or a service drop.
True
Low voltage wires from the distribution transformer to feed several consumers are called ?
Secondary
No loops are placed in the back of the body belt 2” either side of the center
True
The minimum distance from the D rings to the tool pocket is
4”
Climbing equipment should be inspected
Before each use
Climber gaffs should be sharpened
On the bottom side
To a chiseled shaped point
Both of the above
The best of the natural fibers for rope
Manila
The ratio of the safe working load to the breaking strength of the rope is.
1 to 5
Method of finishing the ends of a rope
Eye splice
Back lash
Whipped end
All of the above
A rope used to tie materials or tools in place temporarily
Sling
The outrigger may be used to level the digger Derrick
True
The synthetic fiber rope, that is the most elastic.
Nylon
Manila rope should not be used on voltages over
5000 volts
A quality Manila fiber will appear in color
Light yellow
The method of construction of fiber rope which pulls rope together.
Yarns and strands twisted in opposite directions.
The most popular rope with power lineman.
Polypropylene
A rope used for stringing in a line conductor.
Running line
After 6 months of use, the safe working load of rope is reduced by
1/2
Rope used to raise and lower heavy loads
Bull rope
A disconnect switch is designed to open a circuit under heavy load
False
Externally mounted radiators and cooling fans on transformers will increase the capacity of transformers
True
“Transmission,” “ Switching,” and “Distribution “ are three types of substations
True
The purpose of a spare transformer in a substation
For use in the event of transformer failure.
Lightning arrestors are installed in substations near
Close to valuable pieces of equipment
Near termination of aerial circuits
Both of the above
A switch that is not designed to be opened under load but used for the isolation of circuits or equipment only
Disconnect switch
The term for the equipment that permits the remote control of substations.
Supervisory control
An electrical devise used to accurately measure line voltage in a substation
Potential transformer
“Coupling capacitors” in substations are used for.
Communication signals
Device (s) wich supplies the information for the purpose of measuring energy
Potential transformer
Current transformer
Both B&C
The voltage at substations may be regulated by TCUL Transformers or step regulators.
True
“Like charges attract and unlike charges repel “
An inaccurate statement
Elementary particle with a positive charge
Proton
Substance containing two or more elements
Compound
Basic material that makes up all matter
Element
Elementary particle, which is a negative charge
Electron
Electron, which will move from atom to atom
Free Electron
The smallest part of an element of matter that can enter into chemical reaction to form a compound.
Atom
The heart of an atom
Nucleus
Has weight and occupies space
Matter
Motion of free electrons
Random movement
Value of which indicates the number of protons in the atom of a particular element
Atomic number
Energy level within energy levels
Sub-shell
The “Shell” is an energy level of an atom identified by letter
True
Indicates how many equal parts the whole untit is divided.
Denominator
Indicates how many equal parts of the whole unit are being considered
Numerator
Indicates what part of the whole unit
Fraction
1/4
Proper
24/6
Improper
5/5
Improper
7 1/5
Mixed
From the fraction 5/8, the 5 is the:
Numerator
From the fraction 3/4, the 4 is the
Denominator
The term used for multiphase is “polyphase”
True
Direct current (DC) transmission of the bulk power is feasible when utilization is a minimum distance of
400 miles
The most common frequency for generated voltages in the United States is
60 cycles
Most transmission lines in the United States are direct current (DC)
False
The advantage of 3-phase in the operation of motors.
More economic and more efficient
A source of electricity produced by the cutting of Flux lines.
Magnetic
A source of electricity that is used in batteries.
Chemical
A source of electricity that is used in photoelectric cells
Light
A generator is an example of
Chemical
Friction
Pressure
None of the above
A source of electricity produced from crystals
Pressure
2/3+1/3+1/3=
11/3
5/6+1/3+1/3=
11/2
3/5+2/7+4/35=
1
2 3/4+1 2/3=
45/12
4 4/7+ 2 16/21 + 1/3 =
7 2/3
8 1/2 + 3 2/3 =
12 1/6
5/8- 1/8 =
1/2
5/8- 1/2 =
1/8
7 1/5 - 4 1/3 =
2 13/15
4 11/16 - 1 1/8 =
3 9/16
5 1/16 - 2 1/32 =
3 1/2
3 2/3 - 1 3/4 =
1 11/12
12 2/3 - 1 1/2 =
11 1/6
From the illustration below, each suspension insulator is 5 3/4” in length, and the pole is 10” in diameter. What is the minimum required extension of the hardware required to satisfy the minimum of 3’ of clearance to the live line.
19 1/2
The leading cause of accidents
Human failure
The type of fire extinguisher for class C fire.
Multi purpose dry chemical
The type of fire extinguisher for ordinary combustible fires
Foam
Multi purpose dry
Carbon dioxide
A petroleum fire is classified as
Class B fire
After 6 months of use, the WLL of a fiber rope is reduced to one half
True
A quality manilla fiber will appear in color
Light yellow
The ratio of the safe working load to the breaking strength of fiber rope is
1 to 5
Balanced primary feeders reduce line losses because
Current is even across all conductors of the line
The distribution system connects the high voltage system to the consumers equipment
True
Low voltage wires from the distribution transformer to feed several consumers is called
Secondary
A common residential service
120/240 volt 3phase 3 wire
In the transmission of power, an increase in voltage would yield ? In current
Decrease
The single phase transformer is less efficient than a three phase motor
True
A fused devise used to protect electrical equipment
Cutout
Climbing equipment should be inspected
Before each use
The most popular rope with power lineman is
Polypropylene
The best of natural fibers for rope
Manila
The safe working load to the breaking strength of the rope is
1 to 5
A term used for a diagram that represents an actual electrical circuit with components represented by graphical symbols
Schematic
The fuse will serve to limit the
Current in the circuit
A stored quantity of electrical energy
Charge
In electricity, the force that tends to have like charges move away from each other.
Repulsion
A term relating to the physical strength of a wood pole, and calculated by the circumference at the top of the pole and a point 6’ from the butt of the pole.
Class
Classification of steel towers
Rigid and flexible
A disconnect switch is a no load switching device.
True
Good treatment will double the life of a wood pole
True
Chromate copper arsenate is a chemical used to kill brush after a tree trimming operation
False
The safety factor for the weight applied to a pole
5 to 1
The static wire on a transmission line serves as an electrical shield
True
The potential transformer is designed to measure
Voltage
The unit of electrical pressure
Volt
The unit of electrical work. (1columb / volt )
Joule
A unit of measure of a quality of electrons : approximately 6.25 × 10
Coulumb
Voltage is measured by placing the voltmeter lead into the circuit.
False
The current in the circuit below will flow
Clockwise
“Unlike charges attract and like charges repel”
Coulumbs law
Basic material that makes up all matter
Elements
Anything that has weight and occupies space
Matter
Fifty-seven and one tenth
57.1
One thousand and twenty -five thousandths
1000.025
Fourteen and two thousandths
14.002
Seven hundred and fifty six and one tenth
756.1
Ten thousand and one ten thousandths
10000.0001
5 6/100
5.06
1 21/100
1.21
871/1000
.871
16.1 × 10’
1610
250x10’ 2
2.5
835÷10’
8.35
3.5 Amp equals 3500
Milliamp
4 megawatts equals 4000
Kilowatts
Prefix representing 1/1,000,000 of a unit
Micro
Prefix representing 1/1,000 units
Milli
Prefix representing 1000
Kilo
The term “natural trimming” refers to the pruning off of limbs near the parent limbs.
True
The three common plants include poison sumac, poison ivy, and poison oak
True
The first treatment for poisonous plants is to wash with soap and water and apply alcohol rinse with water and dry.
True
The clearance achieved during the tree trimming operation should provide adequate clearance for a minimum of
2 years
The trimming must be done in the fall and the winter to protect t the life of the trees
True
The two hitches used on the climbing rope by tree trimmers
Clove and taut
A “Danger tree” is a tree outside of the right of way that could fall within a distance of ? Of the line
5’
The advantage of 3 phase power in the operations of motors
More economical motors
More efficient operations
Opposition to the flow of current
Resistance
The unit of measure of current
Amp
The unit of measure of resistance
Ohm
The electrical symbol for the opposition of current flow
R
The electrical symbol of current
I
Current which flows in only one direction
DC
A circuit that has all of its components connected from end to end
Series
A name specific for a number of electrons, which total 6.26 x10
Coulomb
Energy on a transmission system is lost in the form of
Heat
One coulomb in one second equals one ampere.
True
10 coulombs in 10 seconds
1 amp
15 coulombs in 3 seconds
5 amps
A source of electricity that is used in photoelectric cells
Light
A source of electricity produced by the cutting edge of Flux lines
Magnetic
A generator converts mechanical energy to electrical energy
True
The meter used to measure current flow
Ammeter
To measure current flow, the meter is connected
Into the circuit
A mathematical relationship that exists between voltage, current, and resistance
Ohms law
6X + Y + 2Y
6X + 3Y
5R + 3R + 6 + 2
8R+8
20X/10
20
7X + 9 =30
3
5X = 40
8
3X + 5 = 50
15
3X - 4 = 20
8
“Lay length” refers to
Length of one revolution of a strand
The term “Lay” refers to
Configuration of strands and wires
Give the ratio of the tensile strength to the SWL of wire rope when hoisting personnel.
10 to 1
From the figure below, identify the lay construction.
Left regular lay.
Identify the lay construction for the following wire ropes. The strands and wires rotate to the left.
Left Lang lay
The strands rotate to the right, and the wires rotate to the left.
Right regular lay
“Preforming” improves a wire ropes
Resistance to unraveling
Resistance to fatigue
IWRC refers to
The core of a wire rope
XIP refers to
The grade of the wire rope
The wire rope, which has the greatest resistance to bending fatigue
Lang lay
The wire rope, which has the greatest resistance to rotation from a suspended load
Regular lay
Extra improved plow steel, improved plow steel , and plow steel all refer to the
(Grade) of metal used in the manufacturing of the wire rope
Balanced primary feeders reduce the
(Voltage) drop in the circuit
A fused devise used to protect electrical tri al equipment
Cutout
Formula states that it takes one volt to draw one Ampere through 1ohm of resistance
Ohms law
Give the formula for computing current; if voltage and resistance are known
I=E/R
A heating element has a resistance of 2 ohms. How much current will it take when connected to a 120-volt circuit
60 amps. 120/2
The most dangerous amount of current that can pass through the human body is above 100 miliamps. This amount of current is usually fatal. If the resistance of the body is 10,000 ohms and the body should touch a conductor energized with 2400 volts, could the value of the current prove fatal.
Yes
The resistance of 1000’ of #2 copper wire is 1563 ohms. What is the voltage drop in 2000’ of this wire when 90 amps flows through it?
28 volts
Give the formula for computing resistance if the voltage and current are known
R=E/I
With voltage constant, current is ? Proportional to resistance
Inversely
Whith resistance constant, voltage is ? Proportional to current
Directly
Calculate the voltage drop in 2000’ of # 4 copper wire if the resistance of #4 copper is .2485 ohms per 1000’ with a current flow of 26 Amps
7.46
If you wanted to decrease the current in a circuit. You would ? the resistance
Increase
How many amps will a heater draw that has a resistance of 48 ohms and is connected to a 480-volt source.
10 amps
What is the resistance of a 120-volt electric heater that draws 12 ampers
10 ohms
What voltage is required to force 15amps through a resistance of 32 ohms
480 volts
15 is what percent of 45
33 1/3%
What is 5 % of 50
2.5
A 345 Kv transmission line has an 8% voltage loss. What is the voltage at the load
317.4 kv
A 12 % discount will be given on a 2,500 order of transformers if paid within 30 days. What will be the cost of the transformers.
2,200.00
A 20 hp motor has an efficiency of 60% . What is the output of the motor
6 Hp
100 is 5% of what #
2000
Method of finishing off the ends of rope
Backlash
Eye splice
Whipped end
A square knot has ?% of the strength of a straight rope
50%
The following bend is called a
Bight
The following bend is called a
Loop bend
Another name for the butt splice
Short splice
The short end of the rope, which has a bight
Running end
Another name for the side splice
Eye splice
Used to shorten a rope without cutting
Sheepshank
Used to fasten a rope to another rope of equal size
Square knot
Used to join ropes of dissimilar size
Single sheet bend
The strongest straight splice for a fiber rope
Short splice
A splice that would be used for rope running through a sheave
Long splice
A slip hitch is used on the end of a rope to hoist cylindrical objects
Timber hitch
A non-slip eye for general use, which will not jam and unties easily
Bowline knot
A transformer will function normally on a direct current circuit
False
In the transmission of power, an increase in voltage would result in a ? In current
Decrease
A constant - current transformer is classified as a ? Transformer
Street- lighting
Example of instrument transformers
Potential transformer
Current transformer
External cooling devices will increase the capacity of a transformer
True
The primary side of a step-up transformer
Low voltage side
The magnetic circuit of a transformer
Core
A transformer rated at 500 kva is considered a distribution transformer
True
A transformer that is coupled magnetically magnetically and electrically
Autotransformer
The core construction of a transformer that has the core surrounding the coils
Shell
The conductor insulation in transformer windings absorbs the insulating fluid
True
The function of oil in a transformer
Cool and insulate
The indicating red light on a CSP transformer indicates that the service fed by that transformer is definitely interrupted
False
The core of the transformer is laminated to reduce eddy currents
True
The winding conductors are all round in cross - sectional shape in transformers
False
” Coupling Capacitors “ in substations are used for communications signals
True
An electrical device used to meter voltage, which is high in value
Potential transformer
The high and low sides of a transformer can be determined by the size of the bushing
True
Chromated Copper Arsenate is
A pole preservative
Askarel is banned from use in electrical equipment because of
Environment considerations
Oil should be replaced or filtered if voltage flash-over point is ? Or lower
17,500
New insulating fluid should have a minimum flash over-over test voltage of -
30,000 volts
The two (2) primary functions of oil in electrical apparatus.
Cool and insulating
Oil will conduct heat more efficiently than air
True
Qualities of a good insulating/cooling fluid
High insulating and heat conducting properties
Low moisture content
Low flash piint
Insulating/cooling fluid in general use for electrical equipment
Mineral oil
The standard test devise for testing the dielectric strength of insulating oil has electrodes spaced ? Of an inch apart
1/10
The test devise in question #8 has electrodes that have a diameter of
1”
When oil crackles when hot metal is placed into, it is an indication of -
Moisture
Oxygen causes oil to deteriorate and darken
True
Method of removing moisture from oil
Filter press
Raise temperature of oil above 212 degrees
Substation transformer equipped with an expansion tank has a supply of dry ? Gas for the purpose of replacing atmospheric air
Nitrogen
The first step must be followed. Immediately after refilling a transformer with new oil
Allow time to settle
A transformer that repeatedly blows fuses during an electrical storm
Has a high moisture content in the oil
A vector shows
Magnitude and direction
A graphic method of solving two vectors connected tail to tail
Parallelogram
A graphic method of solving 2 or more vectors connected sierries, or head to tail
Triangle method
When testing transformers for polarity, the lineman will
Ground the tank
Apply low voltage to the high side terminals
Which of the following single phase transformers is subtractive by Nema standards
12000 volt 50 Kva
Most smaller distribution transformers are
Additive
The single bushing on the highline of the transformer is identified as
H1
A transformer with a primary coil voltage of 7200 and a 25Kva capacity rating is
Additive
The term “polarity” refers to the relative instantaneous polarity in the 2 winding
True
When testing a transformer for polarity, a low voltage is impressed on the ? voltage winding
High
The wire rope which has the greatest resistance to rotation.
Regular lay
“Performing” improves a wire ropes
Resistance to unraveling
Resistance to fatigue
The resistance of a conductor is directly proportional to its length
True
The term “lay” refers to the number of strands and wires of a wire rope
False
The “right regular lay” wire rope the strands, and the wires rotate right
False
The wire rope that has the greatest resistance to wear from bending
Lang lay
