This book contains seventy five
drivers license tanker test practice questions and
answers. These questions and answers were written by
professional authors with extensive knowledge and experience
in the transportation
industry. This book was designed to help
drivers pass the
commercial drivers license
tanker exam. Each
question allows the participant to select the correct multiple
choice, true false or fill in the blank answer. Just
Hours of Service in a Tank Vehicle
The maximum driving time within a work period
is 10 hours for drivers of tank vehicles with a capacity
greater than 500 gallons when transporting flammable liquid.
(49 CFR 395.1)
Liquids in bulk are transported in tanks,
mounted on trucks, semitrailers, or full trailers.
Transporting liquids, including liquefied gases, in tanks
requires special skills because of the high center of
gravity and the liquid surge of the cargo.
High Center of Gravity
High center of gravity means that the load is
carried high up off the road. This makes the vehicle
top-heavy and easy to roll over. Tankers often roll over.
Tests have shown that tankers can turn over even at the
cautionary speeds posted for curves. You should drive on
highway curves or onramp/ offramp curves well below the
Liquid surge results from movement of the
liquid in partially filled tanks. For example, when coming
to a stop, the liquid will surge back and forth. When the
wave hits the end of the tank, it tends to push the truck in
the direction the wave is moving. If the truck is on a
slippery surface such as ice, the wave can shove a stopped
truck into an intersection. The driver of a tanker must be
very familiar with the handling of the vehicle.
Keep a steady
pressure on the brakes.
To control the surge do not release
brakes too soon when coming to a stop.
Brake far in advance of a stop and
increase your following distance.
If you must make a quick stop to avoid a
crash, use controlled or stab braking. Also, remember
that if you steer quickly while braking, your vehicle
may roll over.
Some liquid tanks are divided into several
smaller tanks by bulkheads. Bulkheads are liquid-tight
separators between compartments inside the tank. When
loading and unloading the smaller tanks, the driver must pay
special attention to weight distribution. Do not put too
much weight on the front or rear of the vehicle.
Some tanks have compartments in them that
have holes. If the compartment walls have holes in them,
they are called baffles.
Baffles let the liquid flow through and help control the
forward and backward liquid surge. However, side to side
surge can still occur which can cause a rollover. Drive
slowly and be careful in taking curves or making sharp turns
with a partially or fully loaded tanker.
Smooth bore (or
unbaffled) tankers have nothing inside to slow down the flow
of the liquid. Therefore, forward and back surge is very
strong. Smooth bore tanks are usually those that transport
food products such as milk. Sanitation regulations rule out
the use of baffles because of the difficulty in cleaning the
inside of the tank. Corrosive liquids are also routinely
transported in smooth bore tanks. Be extremely cautious
(slow and careful) when driving smooth bore tanks,
especially when starting and stopping.
Never load a cargo tank totally full. Liquids
expand as they warm and you must leave room for the
expanding liquid. This is called outage. Since different
liquids expand by different amounts, they require different
amounts of outage. You must know the outage requirement of
your load when transporting liquids in bulk.
How Much to Load?
A full tank of dense liquid such as some
acids may exceed legal weight limits. For that reason, you
may often only partially fill tanks with heavy liquids. The
amount of liquid to load into a tank depends on:
The amount the
liquid will expand in transit.
The weight of the liquid.
Legal weight limits.
Temperature of the load.