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CDL Practice Test: Tankers

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CDL Practice Test: Tankers

Tankers Questions

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Unbaffled liquid tankers are sometimes called:
  • Free flow tanks
  • Smooth bore tanks
  • Unrestricted tanks
  • Selective range tanks
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.

Next
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
  • Use disposable baffles and barriers when hauling food grade tankers
  • Always load a cargo tank with "filler" so that it's completely filled
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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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
  • During turns, liquid will surge to the side of the trailer, increasing the chance of a rollover accident
  • While stopping, liquid will slosh back and forth
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 Liquid Surge?
  • None of these answers are correct
  • 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
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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Next
Why don't most food grade tankers come equipped with baffles?
  • 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
  • Food grade tankers are required to be fitted with baffles or bulkheads
  • Sanitation regulations forbid the use of baffles because of the difficulty in cleaning the inside of the tank
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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What is a Bulkhead?
  • A divider inside a tank to section off liquid or gas
  • 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
  • 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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Next
All of the following tanker-specific inspections are correct, except:
  • Make sure manhole covers and vents have gaskets and that they close correctly
  • Make sure intake, discharge, and cut-off valves are in the correct position before loading, unloading or moving the vehicle
  • All of these inspections are true and correct
  • Check pipes, connections and hoses for leaks
This is a question from page 60 - click here to look up the answer

Quote From Page 84 Of The Illinois CDL Manual:

On all tank vehicles, the most important item to check for is leaks. Check under and around the vehicle for signs of any leaking. Do not carry liquids or gases in a leaking tank. In general, check the following:

  • Tank body or shell for dents or leaks.
  • Intake, discharge and cut-off valves. Make sure valves are in correct position before loading, unloading or moving the vehicle.
  • Pipes, connections and hoses for leaks, especially around joints.
  • Manhole covers and vents. Make sure covers have gaskets and that they close correctly. Keep vents clear so they work correctly.
  • Special purpose equipment. If your vehicle has any of the following equipment, make sure it works:
    • Vapor recovery kits.
    • Grounding and bonding cables.
    • Emergency shut-off systems.
    • Built-in fire extinguisher.

Make sure you know how to operate your special equipment. Check the emergency equipment required for your vehicle. Find out what equipment you are required to carry and make sure you have it (and it works).

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Next
Regarding stopping distance while driving a tanker, which statement is false?
  • 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
  • Fully loaded tankers take longer to stop than empty ones
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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