Study cards 4 Flashcards
True/ False A daily pretrip inspection is required by law for large trucks
True
True/ False If a truck has poor brakes, is overloaded, or has defective tires, any charges laid will be to the driver
true
Too much travel ( should be less than ______ inches/ 6cm) in the slack adjusters of an air brake is a common fault leading to poor braking
2.5”
The angle between the push rod and the adjuster arm should not be more than _____ when the brakes are applied
90 degrees
If a lug nut indicator has turned it means
The nut needs to be tightened
If the slack adjusters are over _____ they will not meet regulatory compliance
90 degrees
Type of braking used during an emergency stop when a truck does not have antilock brakes
Stab braking
Before starting down a grade, what gear should the truck be put in?
The same gear as what was needed going up the hill
True/ False You should investigate hydraulic leaks with the system under pressure
False
What is the maximum temperature of hydraulic oil?
135 F (57 C)
A sound like the hydraulic pump is pumping marbles indicates that the pump is trying to pump more fluid than the system can supply to it. What does this cause?
A partial vacuum in the fluid at the pump (cavitation)
What is cavitation?
A partial vacuum in the fluid at the pump
What is the most common cause of cavitation and hydraulic pump failure?
A partial vacuum in the fluid at the pump
What situations cause cavitation to occur?
- Pump is over revved or brought up to speed before the fluid is adequately warm
- When the fluid is low in the reservoir
- When the filter or suction line is restricted
- When the shut off valve fails to open
- Driving with the PTO engaged
True / false When the temperature is below freezing, the hydraulic pump won’t be damaged by running at the rated rpm while the oil is cold.
False
Which controls are used to bring down the boom in the event of an emergency
Lower controls
What can a person do to stay the same potential as the vehicle when the vehicle is noninsulated and working near energized conductors.
Staying on the vehicle or on a ground gradient mat
What slope is boom type equipment designed to work at
5 degrees or less
True/ False There is no need to stay clear of a truck when the boom is in motion
False because there can be an unexpected electrical contact.
The signal person and the operator should using ________ signals
The same
Use ________ or ______ to communicate with a derrick or crane operator
hand signals or two way radio
Is an operator at an equipotential position when staying on the vehicle?
Yes
_________ bonded to the truck will put an operator in an equipotential zone
Ground gradient mat
What is the best protection for working near a vehicle with a noninsulated boom?
Staying away from the vehicle and anything attached to it
True/ False Electrical shock resistant footwear is a last resort safety barrier
true
What can be done to promote a fast trip out of a circuit if a truck should become energized?
Grounding the truck
Is a circuit dead when it has been isolated and grounded?
No
When a qualified operator is in the bucket of a tested bucket truck, what should the bucket and boom do?
Maintain the same minimum approach distance (MAD) as a qualified worker must maintain when working on a hot line.
What distance should an unqualified operator in a bucket maintain?
10 ft from a distribution circuit and an additional 4 inches per 10 kV over that .
Why do we put boom and bucket covers?
They prevent road salt and wash from contaminating the insulated portions of a unit.
They prolong the life of a boom by protecting it from UV rays
True/ False A current test is made daily before starting work and before working on a higher voltage
True
The _______ shows the amount of current between the upper electrode, which consists of all the metal components bonded together, and the lower electrode, which is the collector band mounted inside and outside of the boom, isolated from thboom.e metal lower
Microampere meter
________ circuit measures the leakage between the upper electrode and the collector band
Boom contamination monitoring
Leakage current should not exceed _______ per kilovolt of the phase to phase voltage of the circuit
1 microampere
On the chart on the digger derrick will show a ____ rating for a slide slope and _____ rating for an uphill slope.
60 degrees
75 degrees
A typical digger derrick _________ chart shows the weight that can be lifted is dependent on the length and angle of the boom
lifting capacity chart
True/ False It is okay to pull a load by rotating the boom sideways
False
To remove a pole out of the ground, use the ________ (butt puller)
Hydraulic pole jack
The lifting capacity of a boom tip or turret winch and the strength of the winch cable or winch rope can be ______ or _______ than the capability of the boom or load.
greater or less
There shall never be less than ______ full wraps of winch rope or winch cable on the winch drum
two
A _____ wire rope winch cable with a 4,200 lb max working load is strong enough to break a boom or tip over a truck while lifting with the boom in one of many weak positions
1/2 inch
True/ False When the auger is unstowed or stowed, there is always a danger of the windup cable or rope breaking during the operation. Everyone must stand clear during the unstowing and stowing operation.
True
What must be done when auguring a pole hole with a digger derrick?
Boom extensions must be adjusted to keep the auger straight.
When installing a screw anchor, an operator will need to _____ the boom and move the boom ______ to follow the anchor into the ground
rotate the boom and move the boom down
Maintaining down pressure so that the outrigger stays about _____ inches off the outrigger plank will keep a steady down pressure on the installation.
2 inches
What happens if there is not enough down pressure when installing an anchor?
Too little down pressure may result in CHURNING the soil and result in a loss of the ability for the anchor to hold the expected load.
What factors is the lifting capacity of a boom dependent on
Stability
Boom Angle
Horizontal Load
Moving conductors into a ______ is a high risk operation because the magnitude of the load is usually unknown and the load increases quickly as the conductor is moved into the bisect
Corner
Are there boom configurations with virtually no horizontal load capactiy?
Yes
True/ False The winch and hydraulic jib used on material building units are only for vertical loads
true
What is the working load limit (WLL)
It is the max load that can be applied to a rigging component and may never be exceeded
What is the working load limit (WLL) used to identify ?
It is used to identify the capacity of individual rigging components
What is the WLL rating based on?
Breaking strength of the equipment divided by a safety factor
What does safety or design factors refer to ?
The theoretical reserve capability of a component calculated by dividing the strength by the WLL
What safety factor is applied to WLL of a component that is used to suspend someone at a specific height?
10 ( or 15)
True/ false The WLL of each piece of rigging hardware must be labeled or identified by size and checked against WLL tables
True
What are fiber ropes?
Ropes made from natural or synthetic fibers
What are the two general categories of rope construction are used in powerline work?
Twisted and braided
How is twisted rope formed?
By coiling three strands together in the same direction
What is the type of rope that has been used for the longest time?
Twisted Rope
What are the types of rope construction?
Three Strand
Hollow Braid
Solid Braid
Double Braid
What are the three general categories of braided construction (rope)
Solid Braid
Double Braid
Hollow Braid
A __________ is firm and stands up well to chafing of stringing blocks. A single ______ cannot be spliced except when used in a double braid rope
Solid Braid
________ also known as braid on braid, is two braided ropes combined into one rope.
Double Braid
A _______ rope core is covered with a ______ rope sheath to produce a strong and spliceable rope that is abrasion resistant.
Braided
A ________ is a braided core with a hollow center that is very quick and easy to splice
Hollow Braid
What are the natural fiber types for rope?
Manila
Sisal
Hemp
What are the natural fiber types for rope?
Manila
Sisal
Hemp
Why are the natural fibers Manila, Sisal, and hemp no longer used in the trade
Their tendency to be heavy, soak up water, mildew and decay
What are some types of synthetic ropes that we can distinguish?
Nylon, Polypropylene, dacron and polyethylene
True/ False It isn’t important to recognize the type of rope being used when performing critical work involving a capstan hoist
False
When you consult the table for WLL for fiber rope and the table only shows breaking strength what should be done?
That number should be divided by 5 for the WLL, or 10 if it is to support people
Rule of thumb for fiber rope strength when accuracy is not critical
- Change rope diameter to eighths
- Square the numerator
- Multiply by:
40 for three strand polypropylene rope
50 for hollow braid polypropylene
50 polydacron rope
70 for three strand nylon rope
90 for double braid nylon rope
A ______ bend is a very secure way to tie together tow rope eneds
Bowline
A _______ bend is typically used to tie together two ropes that have different diameters
Sheet
A ______ is easy to tie, but when it is tied incorrectly it does not form a loop and it goes back on itself
Timber Hitch
A timber hitch is used to what?
used to tie around a pole especially if the pole is to be dragged along the ground
True/ False A splice is more permanent and more efficient than a knot
True
The ______ allows the rope to retain much more of its strength than when using a knot.
Eye Splice
What is the derating factor for an eye splice
10%
What is the derating factor for a bowline knot
45%
What is the derating factor for a running bowline knot
35%
What is the derating factor for a square knot
60%
What is the derating factor for a round turn and two half hitches
50%
What are the different cores that wire rope comes with
Manila
Polypropylene
Wire
Wire rope strength is reduced _______ for a U bolt clipped eye
20%
Wire rope strength is reduced ______ for a flemish eye
10%
Types of web slings
Double Eye Return Eye Endless Triangle End Choker
The strength of a web sling is dependent on
the type of configuration used
What safety factor should a rescue device have and why?
Because of its rugged use, it should have at least a 10 to 1 safety factor
True/ False Hydraulic fluid coming from a pinhole in a hydraulic hose under pressure can pierce the skin.
True
________ without steel reinforcement is especially susceptible to a leak.
Insulated hose
What should you look for on a insulated hose to check for leaks?
Kinks in the hose
Oil gathering in places near the hose
When jumpstarting a vehicle, why should the last connection not be at the battery
Battery could explode
_______ prevent outriggers from penetrating the ground surface
Outrigger Pads
A curb can prevent the outrigger from extending far enough to provide ________
good stability
An insulater bucket truck with an uninsulated lower boom must be _______ to protect workers on the ground.
Grounded
