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CDL Practice Test: Tankers

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CDL Practice Test: Tankers

Tankers Questions

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Good Luck!

How much do liquids expand as they warm?
  • different liquids expand by different amounts
  • None of these answers are correct
  • Liquids expand at 1kg/m per 10 degree increase
  • Most liquids do not expand when heated
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.

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What type of tanker trailers are normally unbaffled?
  • All tanker trucks are equipped with baffles
  • Food grade tankers
  • Tankers designed to haul non-liquid products
  • Fuel tankers
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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Regarding stopping distance while driving a tanker, which statement is false?
  • All of these statements are true
  • Liquid surge may force your truck forward after you have already come to a complete stop
  • Fully loaded tankers take longer to stop than empty ones
  • Wet roads double the normal stopping distance
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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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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While driving a liquid tanker around a curve, you should:
  • Use quick steering movements to keep liquids from collecting on one side
  • Be confident that your lower center of gravity will reduce the risk of a rollover
  • 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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The amount of liquid to load into a tank depends on:
  • The amount the liquid will expand in transit (outage)
  • All of these should be taken into consideration when loading liquid into a tank
  • The weight of the liquid
  • Legal weight limits
This is a question from page 61 - click here to look up the answer

Quote From Page 85 Of The Illinois CDL Manual:

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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Why don't most food grade tankers come equipped with baffles?
  • To save room in the tank, most shippers of liquid food products prefer to forgo baffles so more product can be loaded
  • 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
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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Why do liquid tankers need to be driven more smoothly than most other vehicles?
  • 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
  • Quick acceleration will cause unnecessary sloshing and control difficulties
  • All of these are correct
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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