Connecticut Combination Vehicles CDL Test Cheat Sheet (CT)

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THE EARLIEST WAY TO NOTICE A TRAILER SKID IS:

Correct! Wrong!

The earliest and best way to recognize that the trailer has started to skid is by seeing it in your mirrors. Any time you apply the brakes hard, check the mirrors to make sure the trailer is staying where it should be.

A KINGPIN IS:

Correct! Wrong!

The kingpin is a connector between a tractor and trailer in a fifth-wheel coupling.

YOU CAN DAMAGE THE LANDING GEAR IF YOU:

Correct! Wrong!

Have tractor lined up with the trailer before pulling out. Pulling out at an angle can damage landing gear.

THE HAND VALVE SHOULD BE USED:

Correct! Wrong!

The trailer hand valve should be used only to test the trailer brakes. Do not use it in driving because of the danger of making the trailer skid.

YOU SHOULD NOT BACK A TRACTOR UNDER A TRAILER UNTIL THE WHOLE AIR SYSTEM IS:

Correct! Wrong!

Do not back under the trailer until you connect both the emergency and the service line and make sure air pressure is up to normal.

WHEN SHOULD YOU USE THE HAND VALVE TO PARK A COMBINATION VEHICLE?

Correct! Wrong!

Never use the hand valve for parking, because all the air might leak out unlocking the brakes (in trailers that don't have spring brakes). Always use the parking brakes when parking. If the trailer does not have spring brakes, use wheel chocks to keep the trailer from moving.

TRAILER MADE BEFORE 1975, EQUIPPED WITH AIR BRAKES:

Correct! Wrong!

Newer trailers have spring brakes just like trucks and truck tractors; however, converter dollies and trailers built before 1975 are not required to have spring brakes. Those that do not have spring brakes have emergency brakes, which work from the air stored in the trailer air tank.

WHEN YOU TURN SUDDENLY WHILE PULLING DOUBLES, WHICH TRAILER IS MOST LIKELY TO TURN OVER?

Correct! Wrong!

Rearward amplification increases the chances of the rear trailer turning over. Depending on the combination vehicle type and length, the amount of rearward amplification can vary. When pulling doubles, the rear trailer is 1.5 to 2 times as likely to turn over as the tractor.

IF THE SERVICE AIR LINE COMES APART WHILE YOU ARE DRIVING A COMBINATION VEHICLE BUT THE EMERGENCY LINE STAYS TOGETHER, WHAT WILL HAPPEN RIGHT AWAY?

Correct! Wrong!

If the service air line comes apart while you are driving a combination vehicle, but the emergency line stays intact, you will lose control over your trailer's brakes. The tractor's brake will remain functional, as will the trailer's emergency brakes.

THE SAFETY LATCH FOR THE FIFTH WHEEL LOCKING LEVER MUST BE ____ FOR A COUPLING TO BE COMPLETE.

Correct! Wrong!

While inspecting coupling, check that the fifth wheel locking lever is in the lock position and that the safety latch is in position over locking lever (on some fifth wheels the catch must be put in place by hand).

TO DRIVE YOU NEED TO RAISE THE LANDING GEAR ONLY UNTIL IT JUST LIFTS OFF THE PAVEMENT. TRUE OR FALSE?

Correct! Wrong!

Raise the landing gear all the way up. Never drive with landing gear only part way up as it may catch on railroad tracks or other things. After raising landing gear, secure the crank handle safely.

WHY SHOULD YOU NOT USE THE TRAILER HAND VALVE WHILE DRIVING?

Correct! Wrong!

The trailer hand valve should be used only to test the trailer brakes. Do not use it in driving because of the danger of making the trailer skid. The foot brake sends air to all of the brakes on the vehicle (including the trailer(s). There is much less danger of causing a skid or jackknife when using just the foot brake.

MORE THAN HALF OF TRUCK DRIVER DEATHS IN CRASHES ARE THE RESULT OF TRUCK ROLLOVERS. TRUCKS TURN OVER EASIER WHEN FULLY LOADED AND ARE:

Correct! Wrong!

More than half of truck driver deaths in crashes are the result of truck rollovers. When more cargo is piled up in a truck, the “center of gravity” moves higher up from the road. The truck becomes easier to turn over. Fully loaded rigs are ten times more likely to roll over in a crash than empty vehicles.

THE FIFTH WHEEL LOCKING LEVER IS NOT LOCKED AFTER THE JAWS CLOSE AROUND THE KINGPIN. THIS MEANS THAT:

Correct! Wrong!

If you are inspecting the coupling and notice that the fifth wheel locking lever is not in the lock position, the coupling is not right. Get it fixed before you start driving.

YOU ARE COUPLING A TRACTOR TO A TRAILER AND HAVE BACKED UP TO IT, BUT NOT UNDER IT. WHAT SHOULD YOU HOOK UP BEFORE BACKING FULLY UNDER THE TRAILER?

Correct! Wrong!

When you have backed up to the trailer, connect the emergency and service air lines and supply air to the trailer brake system.

WHEN YOU INSPECT THE COUPLING, CHECK TO ENSURE THAT:

Correct! Wrong!

When conducting a walk-around and inspecting coupling, always make sure that air lines are properly connected, there are no air leaks and there is enough slack for turns.

USING THE TRAILER HAND VALVE (JOHNSON/TROLLEY VALVE) BEFORE THE BRAKE PEDAL TO PREVENT TRAILER SKIDS IN NORMAL DRIVING:

Correct! Wrong!

The trailer hand valve should be used only to test the trailer brakes. Do not use it in driving because of the danger of making the trailer skid. The foot brake sends air to all of the brakes on the vehicle (including the trailer(s). There is much less danger of causing a skid or jackknife when using just the foot brake.

WHAT IS OFF-TRACKING?

Correct! Wrong!

Off-tracking causes the path followed by a tractor to be wider than the rig itself. Longer vehicles will off-track more. The rear wheels of the powered unit (truck or tractor) will off-track some, and the rear wheels of the trailer will off-track even more.

WHAT TYPE OF TRAILERS CAN GET STUCK ON RAILROAD-HIGHWAY CROSSINGS?

Correct! Wrong!

Low-slung units (lowboy, car carrier, moving van, possum-belly livestock trailer) and single-axle tractor pulling a long trailer with its landing gear set to accommodate a tandem-axle tractor stand a higher chance of getting stuck on a railroad-highway crossing.

WHAT IS OFF-TRACKING?

Correct! Wrong!

Off-tracking causes the path followed by a tractor to be wider than the rig itself. Longer vehicles will off-track more. The rear wheels of the powered unit (truck or tractor) will off-track some, and the rear wheels of the trailer will off-track even more.

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