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CDL Practice Test: Tankers

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CDL Practice Test: Tankers

Tankers Questions

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What type of tanker trailers are normally unbaffled?
  • Food grade tankers
  • Tankers designed to haul non-liquid products
  • Fuel tankers
  • All tanker trucks are equipped with baffles
This is a question from page 61 - click here to look up the answer

Quote From Page 84 Of The Illinois CDL Manual:

Unbaffled liquid tankers (sometimes called "smooth bore" tanks) have nothing inside to slow down the flow of the liquid. Therefore, forward-and-back surge is very strong. Unbaffled tanks are usually those that transport food products (e.g., milk). (Sanitation regulations forbid the use of baffles because of the difficulty in cleaning the inside of the tank.) Be extremely cautious (slow and careful) in driving smooth bore tanks, especially when starting and stopping.

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What are unbaffled tanks?
  • Liquid is held in place by multiple barriers, restricting liquid surge
  • There are barriers in the tank with holes in them to slow down and restrict surging liquid
  • There are no barriers inside to slow down or stop liquid from surging
  • Small tanks which are loaded and secured onto flatbed trailers
This is a question from page 61 - click here to look up the answer

Quote From Page 84 Of The Illinois CDL Manual:

Unbaffled liquid tankers (sometimes called "smooth bore" tanks) have nothing inside to slow down the flow of the liquid. Therefore, forward-and-back surge is very strong. Unbaffled tanks are usually those that transport food products (e.g., milk). (Sanitation regulations forbid the use of baffles because of the difficulty in cleaning the inside of the tank.) Be extremely cautious (slow and careful) in driving smooth bore tanks, especially when starting and stopping.

TruckingTruth's Advice:

Unbaffled tankers are much more dangerous to drive, especially when the tanks aren't completely full, as liquid can surge and slosh around in any direction hindering vehicle control.

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Why do liquid tankers need to be driven more smoothly than most other vehicles?
  • Quick acceleration will cause unnecessary sloshing and control difficulties
  • All of these are correct
  • While stopping, liquid will slosh back and forth
  • During turns, liquid will surge to the side of the trailer, increasing the chance of a rollover accident
This is a question from page 61 - click here to look up the answer

Quote From Page 85 Of The Illinois CDL Manual:

In order to drive tank vehicles safely, remember:

  • Drive smoothly - Because of the high center of gravity and the surge of the liquid, you must start, slow down and stop very smoothly. Also, make smooth turns and lane changes.
  • Braking - If you must make a quick stop to avoid an accident, use controlled or stab braking. Also, remember that if you steer quickly while braking, your vehicle may roll over.
  • Curves - Slow down before curves, then accelerate slightly through the curve. The posted speed for a curve may be too fast for a tank vehicle.
  • Stopping distance - Keep in mind how much space you need to stop your vehicle. Remember that wet roads double the normal stopping distance. Empty tank vehicles may take longer to stop than full ones.
  • Skids - Do not over steer, over accelerate or over brake. If you do, your vehicle may skid. On tank trailers, if your drive wheels or trailer wheels begin to skid, your vehicle may jackknife. When any vehicle starts to skid, you must take action to restore traction to the wheels.
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What is a Bulkhead?
  • A device that is placed on the top of liquid or gas and compresses it as low as possible to decrease the center of gravity
  • Used to hold all liquid or gas to one side of the tank
  • A divider inside a tank to section off liquid or gas
  • Used to elevate liquid to a higher center of gravity
This is a question from page 61 - click here to look up the answer

Quote From Page 84 Of The Illinois CDL Manual:

Some liquid tanks are divided into several smaller tanks by bulkheads. When loading and unloading the smaller tanks, the driver must pay attention to weight distribution. Do not put too much weight on the front or rear of the vehicle.

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Which statement below is false?
  • Liquid tankers are easier to roll over
  • Liquid tankers are harder to stop in an emergency than other types of vehicles
  • All tankers have baffle devices to limit sloshing of liquids
  • Tanker vehicles have a higher center of gravity
This is a question from page 60 - click here to look up the answer

Quote From Page 84 Of The Illinois CDL Manual:

Hauling liquids in tanks requires special skills because of the high center of gravity and liquid movement. A high center of gravity means that much of the load's weight is carried high up off the road. This makes the vehicle top-heavy and easy to roll over. Liquid tankers are especially easy to roll over. Tests how that tankers can turn over at the speed limits posted for curves. Take highway curves and on-ramp/off-ramp curves well below the posted speed limits.

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Which of these tanker trucks are the least likely to have baffles installed
  • A tank carrying milk
  • A tank filled with propane
  • A tank filled with oil
  • A tank carrying automotive gasoline
This is a question from page 61 - click here to look up the answer

Quote From Page 84 Of The Illinois CDL Manual:

Unbaffled liquid tankers (sometimes called "smooth bore" tanks) have nothing inside to slow down the flow of the liquid. Therefore, forward-and-back surge is very strong. Unbaffled tanks are usually those that transport food products (e.g., milk). (Sanitation regulations forbid the use of baffles because of the difficulty in cleaning the inside of the tank.) Be extremely cautious (slow and careful) in driving smooth bore tanks, especially when starting and stopping.

TruckingTruth's Advice:

Baffles make cleaning the inside of a tank vehicle very difficult. Since most food grade tankers have to be completely clean and sanitary before each load, it is very rare for food grade tankers to have baffles.

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What is Liquid Surge?
  • Results from movement of the liquid in partially filled tanks
  • If the tank is punctured, the liquid will rush out of the opening
  • When liquid naturally swirls inside of a tank
  • None of these answers are correct
This is a question from page 61 - click here to look up the answer

Quote From Page 84 Of The Illinois CDL Manual:

Liquid surge results from movement of the liquid in partially filled tanks. This movement can have bad effects on handling. 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 out into an intersection. The driver of a liquid tanker must be very familiar with the handling of the vehicle.

TruckingTruth's Advice:

Liquid surge can result from nearly any conceivable movement. Steering left, right, accelerating, or slowing down can all cause liquid to surge. Even after stopping a liquid filled tanker, the liquid will surge back, then forward again, possibly forcing your truck to "jump" forward once more. That's why it's good practice to stay further back from vehicles, even when stopped.

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When loading a tank, you should:
  • Expect liquid to evaporate and lighten your gross weight over time
  • Never load a cargo tank so that it's totally full
  • Always load a cargo tank with "filler" so that it's completely filled
  • Use disposable baffles and barriers when hauling food grade tankers
This is a question from page 61 - click here to look up the answer

Quote From Page 85 Of The Illinois CDL Manual:

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 when hauling liquids in bulk.

A full tank of dense liquid (such as some acids) may exceed legal weight limits. For that reason, you often may 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.
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