2-6-1 Mobile Cranes Flashcards
The __?__ is held responsible for any deficiencies found at a D.O.T. stop.
Driver
An off-center valve stem in a truck wheel opening is an indicator of a loose wheel.
True
If a vehicle has air brakes, they should be inspected __?__.
pretrip
With the engine stopped, the foot brake on a truck with air brakes should hold for one minute with less than __?__ of air pressure loss.
2 psi
The last connection when jump starting a vehicle should be to __?__.
a negative point remote from the battery
Cell phone use is not a danger while driving if you use a hands-free unit.
False
When braking, never use the hand valve to apply brakes only to the trailer.
True
The height of a digger derrick is not important because all bridges and underpasses are at least 14 feet high.
False
The best way to inspect for a hydraulic fluid leak is by running your hands along the lines while the system is under pressure.
False
A high-pitched whine in the hydraulic system indicates __?__.
the fluid is not properly warmed up
Non conducting hydraulic lines used on the tool outlet of a bucket truck are generally __?__.
orange in color
When an insulated boom needs to be cleaned, it should be __?__.
hand washed
Any downward movement of a boom during a holding valve test is an indication of __?__ in the system.
air
In most cases, lowering a boom without hydraulic power or battery backup should be left to a __?__.
specialist
Boom-type equipment is designed to work at a slope of __?__ or less.
5 degree
When the vehicle is on an incline, extending the outriggers reduces the holding power of the tires.
True
The best protection when working near a vehicle with a noninsulated boom is to stay away from the vehicle.
True
All hand signals are standard and will not vary from location to location.
False
Properly grounding a truck allows for __?__ in case the truck should become energized.
a fast trip out
A current monitoring meter should never show more than 69 microamperes on a 69kv line.
True
Boom leakage of more than __?__ can leave track burns inside the boom.
1 ma
A side pull with a digger derrick can damage the __?__.
rotation gear
The best way to loosen a pole prior to pulling it is to grab it with the pole guides and rotate the boom from side to side.
False
The winch and hydraulic jib used on material handling units are for __?__ loads only.
Vertical
If a chart refers to “bare shaft capacity”, the total weight of the buckets, jib, and workers must be subtracted from the capacities shown on the chart.
True
