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CDL Practice Test: Tankers

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CDL Practice Test: Tankers

Tankers Questions

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Good Luck!

Why don't most food grade tankers come equipped with baffles?
  • Sanitation regulations forbid the use of baffles because of the difficulty in cleaning the inside of the tank
  • Food grade tankers are required to be fitted with baffles or bulkheads
  • Food products are generally light enough that the entire tank can be filled, thus, limiting any liquid surge
  • To save room in the tank, most shippers of liquid food products prefer to forgo baffles so more product can be loaded
This is a question from page 61 - click here to look up the answer

Quote From Page 84 Of The Illinois CDL Manual:

Sanitation regulations forbid the use of baffles because of the difficulty in cleaning the inside of the tank.

TruckingTruth's Advice:

Anytime you see a food grade tanker, it is safe to assume there are no baffles installed. Not only is that important for you to know when pulling a food grade tanker, but you can also drive differently around other vehicles that are pulling food grade tankers (give them more room).

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Which statement below is false?
  • All tankers have baffle devices to limit sloshing of liquids
  • Liquid tankers are easier to roll over
  • Tanker vehicles have a higher center of gravity
  • Liquid tankers are harder to stop in an emergency than other types of vehicles
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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Regarding stopping distance while driving a tanker, which statement is false?
  • Fully loaded tankers take longer to stop than empty ones
  • Wet roads double the normal stopping distance
  • All of these statements are true
  • Liquid surge may force your truck forward after you have already come to a complete stop
This is a question from page 61 - click here to look up the answer

Quote From Page 85 Of The Illinois CDL Manual:

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.

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While driving a liquid tanker around a curve, you should:
  • Be confident that your lower center of gravity will reduce the risk of a rollover
  • Use quick steering movements to keep liquids from collecting on one side
  • Always drive the posted speed for a curve
  • Understand that the posted speed for a curve may be too fast for a tank vehicle
This is a question from page 61 - click here to look up the answer

Quote From Page 85 Of The Illinois CDL Manual:

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.

TruckingTruth's Advice:

All maneuvers in a tanker truck should be made slower and smoother than other vehicle types.

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What are unbaffled tanks?
  • Liquid is held in place by multiple barriers, restricting liquid surge
  • Small tanks which are loaded and secured onto flatbed trailers
  • 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
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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Baffled tanks are:
  • Designed to contain several solid bulkheads
  • Used only for gas products
  • Tanks without any bulkheads
  • Liquid tanks with several bulkheads containing holes that liquid can flow through
This is a question from page 61 - click here to look up the answer

Quote From Page 84 Of The Illinois CDL Manual:

Baffled liquid tanks have bulkheads in them with holes that let the liquid flow through. The baffles help to control the forward and backward liquid surge. Side-to-side surge can still occur. This can cause a roll over.

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How are bulkheads different than baffles?
  • Bulkheads are solid barriers in a tank while baffles are barriers with holes in them, allowing liquid to flow through
  • Baffles are solid barriers in a tanks while bulkheads are barriers with holes in them, allowing liquid to flow through
  • Bulkheads are only used in gas tankers and baffles are only used in liquid tankers
  • Bulkheads are only allowed in food-grade tankers where baffles can be installed in any type of tanker
This is a question from page 61 - click here to look up the answer

Quote From Page 84 Of The Illinois CDL Manual:

Bulkheads: 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.


Baffled tanks: Baffled liquid tanks have bulkheads in them with holes that let the liquid flow through. The baffles help to control the forward and backward liquid surge. Side-to-side surge can still occur. This can cause a roll over.

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When loading a tank, you should:
  • Always load a cargo tank with "filler" so that it's completely filled
  • Use disposable baffles and barriers when hauling food grade tankers
  • Never load a cargo tank so that it's totally full
  • Expect liquid to evaporate and lighten your gross weight over time
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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