CDL Practice Tests For Doubles And Triples Page 2

Doubles And Triples Practice Questions

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Good Luck!

If the dolly has spring brakes, release them with:
  • The dolly parking brake control
  • The air tank petcock
  • The emergency air line
  • The parking brake release knob
Click here to look up the answer

From The CDL Manual

Release dolly brakes by opening the air tank petcock. (Or, if the dolly has spring brakes, use the dolly parking brake control.)

Next
To position the converter dolly over short distances you can:
  • Ask the shipper to do it
  • Get your dispatcher to help
  • Move it by hand
  • Call a friend
Click here to look up the answer

From The CDL Manual

If the distance is not too great, wheel dolly into position by hand so it is in line with the kingpin.

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Next
When connecting converter dolly to the front trailer, support gear should be:
  • Raised
  • Lowered
  • Removed
  • Half-way up
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From The CDL Manual

Hook dolly to front trailer.

  • Lock pintle hook.
  • Secure converter gear support in raised position.
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Next
When coupling, correct trailer height should:
  • Require high RPM's to get under it
  • Raise slightly when dolly moves under it
  • Completely clear the dolly
  • Be 4.5 feet off the ground
Click here to look up the answer

From The CDL Manual

Make sure trailer height is correct. (It must be slightly lower than the center of the fifth wheel, so trailer is raised slightly when dolly is pushed under.)

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Next
After coupling, the air shut-off valves at the back of the first trailer should be:
  • Disconnected
  • Closed
  • Half-open
  • Open
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From The CDL Manual

Open shut-off valves at rear of first trailer (and on dolly if so equipped).

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Next
A visual inspection after coupling should show that:
  • The locking jaws are open
  • Landing gear is completely lowered
  • The locking jaws have closed on the kingpin
  • There is space between the upper and lower fifth wheel
Click here to look up the answer

From The CDL Manual

Raise landing gear slightly off ground to prevent damage if trailer moves.

Make visual check of coupling. (No space between upper and lower fifth wheel. Locking jaws closed on kingpin.)

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Next
You can test whether the trailer air system is charged by:
  • Trying to pull the trailer
  • Opening the emergency line shut-off
  • Looking at your air gauges
  • Pumping the brakes repeatedly
Click here to look up the answer

From The CDL Manual

Charge trailers (push “air supply” knob in) and check for air at rear of second trailer by opening the emergency line shut-off. If air pressure is not there, something is wrong and the brakes will not work.

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Next
When coupling or uncoupling, trailer or dolly wheel should always be:
  • Free-rolling
  • Locked and/or chocked
  • Half-flat to avoid rolling
  • Raised off the ground
Click here to look up the answer

From The CDL Manual

Connect converter dolly to rear trailer:

Make sure trailer brakes are locked and/or wheels chocked.

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Next
When uncoupling twin trailers you should park:
  • On an uphill incline
  • At a 45 degree angle to the trailer
  • In a straight line on firm level ground
  • In a truck stop parking lot
Click here to look up the answer

From The CDL Manual

Uncouple rear trailer:

Park in a straight line on firm level ground.

Prev
Next
When uncoupling the rear trailer, which of these should be done first?
  • Disconnect dolly air and electric lines
  • Pull tractor, trailer and dolly out
  • Lower trailer landing gear
  • Apply rig parking brakes
Click here to look up the answer

From The CDL Manual

Uncouple rear trailer:

  • Park in a straight line on firm level ground.
  • Apply parking brakes so rig will not move.
  • Chock wheels of second trailer if it does not have spring brakes.
  • Lower landing gear of second semitrailer enough to remove some weight from dolly.
  • Close air shut-offs at rear of first semitrailer (and on dolly if so equipped).
  • Disconnect all dolly air and electric lines and secure them.
  • Release dolly brakes.
  • Release converter dolly fifth wheel latch.
  • Slowly pull tractor, first semi-trailer and dolly forward to pull dolly out from under rear semi-trailer.
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CDL Practice Tests For Doubles And Triples

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