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Kansas CDL Triples Quiz/Study Guide
When coupling doubles, start by
A) coupling the second trailer to the tractor
B) backing the converter dolly completely under the second trailer
C) coupling the converter tongue to the pintle hook on the first trailer
D) placing the converter dolly in front of the second trailer.
When pulling more than one trailer, which trailer should be the first one behind the tractor?
A) The lightest
B) The heaviest
C) The shortest
D) The one with the best tires
To uncouple trailers, you should park your rig
A) on a slight incline.
B) on level ground.
C) on concrete only.
D) on dirt or gravel only.
If you want to couple a second trailer to your combination vehicle, secure it by using
A) the trailer's spring brakes or emergency air brakes
B) wheel chocks
C) either of the above
D) none of the above
To check for air flow to the last trailer,
A) pull forward and step on brake pedal.
B) open shut off valves at the back of the rear trailer and listen for escaping air.
C) step on brake pedal and watch for brake lights.
D) test emergency brake lines on a level surface.
Before backing a dolly under a trailer, you should make sure the fifth wheel jaws are
A) open in order to avoid damaging the jaws when they hit the king pin.
B) closed in order to secure the jaws around the king pin.
C) open in order to allow the king pin to go past them.
D) Both A and C
Which of these is a possible risk if you unlatch the pintle hook while the converter dolly is still under the last trailer?
A) The dolly tow bar may fly up.
B) The air lines will rupture.
C) The trailer brakes will unlock.
D) The dolly brakes will lock.
If you are pulling doubles or triples when a set of trailer wheels goes into a skid, which of these is likely to occur first?
A) The rig will continue to move in a straight line even if you turn the steering wheel.
B) The emergency brakes will apply automatically.
C) The rig will continue forward, but the trailer will slide sideways.
D) The wheels will lock up for no reason.
You should check the height of the trailer before connecting a converter dolly to a second or third trailer. The trailer height is correct when
A) the trailer will be raised slightly when the converter dolly is backed under it.
B) the kingpin rests on the fifth wheel.
C) the center of the kingpin lines up with the locking jaws.
D) all of the above.
Which of these statements about quick steering movements and doubles/triples is true?
A) Counter-steering is easier with doubles/triples than with most other vehicles.
B) You should apply the brakes at the same time you perform quick steering movements.
C)Doubles/triples are no problem with a quick steering movement.
D) Doubles/triples flip over from sudden steering more easily than many other vehicles.
To uncouple the converter dolly from the rear trailer you should
A) set trailer brakes, lower trailer landing gear, and close shutoffs on the next trailer forward.
B) lower trailer landing gear, set trailer brakes and close shutoffs on the next trailer forward.
C) close shutoffs on the next trailer forward, set trailer brakes, and lower trailer landing gear.
D) lower landing gear, set trailer brakes and remove safety chains.
The correct steps before unhooking a converter dolly from the pintle hook of the lead trailer are as follows:
A) Lower dolly landing gear. Apply converter gear spring brakes or chock wheels. Disconnect safety chains.
B) Disconnect safety chains. Apply converter gear spring brakes or chock wheels. Lower dolly landing gear.
C) Apply converter gear spring brakes or chock wheels. Disconnect safety chains. Lower dolly landing gear.
D) Lower dolly landing gear. Disconnect safety chains. Apply converter gear spring brakes or chock wheels.
To test the trailer service brakes, you should
A) lightly test the foot brake control at 5 mph
B) apply the hand control (if available) at 5mph to feel whether the trailer brakes apply.
C) stomp on the brake pedal.
D) release the trailer air knob.
The most effective way to stop a skid is to
A) use stab braking.
B) countersteer and accelerate.
C) restore traction to the tires.
D) brake hard.
The first step in restoring traction during a skid is to
A) stop using the brakes.
B) press the foot brake firmly and hold.
C) use the trailer hand brake only.
D) apply and release the brakes quickly and repeatedly.
Trucks with double or triple trailers
A) have a dangerous "crack the whip" effect.
B) amplify a hazardous wave effect toward the rear of the trailer.
C) can turn over in response to abrupt steering movements.
D) all of the above.
Which of these techniques below will provide the best control on curves?
A) Keep up with the car traffic in the curve.
B) Downshift while you are in the curve.
C) Brake and downshift while you are in the curve.
D) Slow down to a safe speed before entering the curve, and accelerate slightly through the curve.
In order to charge the air tanks of a second trailer, you must
A) Open the shut-off valves at the rear of the first trailer and close the shut-off valves at the rear of the second trailer.
B) Close the shut-off valves at the rear of both trailers.
C) Open the shut-off valves at the rear of both trailers.
D) Open the air tank valve (petcock) on the converter dolly.
Which of these statements about managing space is true?
A) Always keep your vehicle to the right side within your lane of travel.
B) Allow more following distance and avoid traveling beside other vehicles.
C) Doubles and triples have the same stopping distance as other vehicles because they have more axles.
D) all of the above.
In order to pull doubles and triples, at highway speeds, smoothly and to avoid sudden movements, drivers must
A) keep their vision focused on the first hundred feet ahead of the vehicle.
B) keep their vision focused at a point four hundred yards (
- mile) ahead of the vehicle.
C) keep vision moving side-to-side, near-and-far.
D) keep up with the flow of the fastest traffic.
How far ahead of your vehicle should you look when driving a double/triple combination at highway speed?
A) One football field
B) Four tractor-trailer lengths
C) Five car lengths
D) Twelve to fifteen seconds
By checking the tractor protection valve, you can reduce the chance of
A) the emergency brakes coming on due to loss of air.
B) loss of air from the trailer supply (red) line.
C) loss of air from the trailer brakes.
D) all of the above.
The order of steps for backing a converter dolly under the rear trailer are as follows:
A) Back under the trailer, check the trailer for spring brakes (or chock wheels), check trailer height.
B) Check the trailer for spring brakes (or chock wheels), back under the trailer, check trailer height.
C) Check the trailer for spring brakes (or chock wheels), check trailer height, back under trailer.
D) Check trailer height, back under trailer, check for spring brakes (or chock wheels).
Before backing a converter dolly under the trailer, the proper height of a trailer is
A) one inch above the converter dolly's fifth wheel.
B) two inches above the converter dolly's fifth wheel.
C) three inches above the converter dolly's fifth wheel.
D) low enough that the trailer will be lifted slightly when the dolly is backed underneath.
On trailers equipped to be used in double/triple combinations, you will find air shut-off valves on
A) the front of the vehicle only.
B) the service air lines only.
C) the emergency air lines only.
D) both service and emergency air lines.
If the second trailer does not have spring brakes, and you have no wheel chocks available you should
A) not couple the trailer until you have wheel chocks.
B) back under with a quick, swift momentum before the trailer has time to move.
C) charge the trailer's air tanks with the tractor and then disconnect the emergency line to set the emergency air brakes.
D) connect the electric cord to the rear trailer to set the electric brakes.
The first step in coupling doubles is to
A) connect the tractor to the second trailer.
B) place the converter dolly in front of the rear trailer and in line with the king pin.
C) connect the converter dolly tongue to the pintle hook on the front trailer.
D) use the tractor to push the converter dolly under the second trailer until the king pin jaws are fully locked.
You can tell whether the converter dolly is equipped with anti-lock brakes
A) by checking whether its paint is really new.
B) by checking its registration card.
C) by asking the mechanic in the shop.
D) by checking for a yellow indicator lamp on the left side of the dolly draw bar.
If a dolly has no parking brake control knob, you can release the dolly's brakes by
A) closing the shut-off valves at the rear of the first trailer.
B) disconnecting the emergency air supply line.
C) disconnecting the service air supply line.
D) opening the air tank valve (petcock) on the converter dolly.
The best way to check whether a fifth wheel is completely locked is to
A) engage the clutch swiftly to see whether the trailer follows.
B) ask a mechanic to check it for you.
C) apply the brakes and pull with the trailer brakes applied.
D) visually inspect the jaws and kingpin with a flashlight.
During your walk-around inspection of a double or triple trailer rig, you should be sure the converter dolly air tank drain valves are ______ and the pintle hook is _____.
A) latched, closed
C) open, latched
D) closed, latched
When connecting a tractor with a sliding fifth wheel to a 28-foot trailer (pup), the fifth wheel should be
A) all the way forward.
B) back far enough to avoid damaging the landing gear or cab on turns.
C) halfway between front and back notches.
D) left unlocked so that it can slide easily when necessary.
When pulling "turnpike doubles" (double 53-foot trailers), the ideal position for the tandems on the FRONT trailer is
A) all the way back.
B) all the way forward.
C) halfway between front and back.
D) left unlocked so that they can slide easily when necessary.
When uncoupling a converter dolly from the rear trailer, you find that the converter dolly wheels will not roll. You know that the dolly has no spring brakes or parking brake control knob. You can release the brakes by
A) charging the dolly's air tank.
B) banging the dolly's brake shoes with a heavy hammer.
C) pulling the dolly from under the trailer in a swift, smooth motion.
D) draining the dolly air tank.
When pulling double/triple combinations at highway speed, you should use the trailer brake hand control
A) when descending long grades.
B) when the rear trailer goes into a skid.
C) any time road conditions are slick.
The proper order of steps before pulling a dolly from underneath a trailer is as follows.
A) Set trailer brakes, lower trailer landing gear, disconnect air/electrical lines, drain dolly air tank, release fifth wheel latch.
B) Set trailer brakes, release fifth wheel latch, drain dolly air tank, lower trailer landing gear.
C) Disconnect air/electrical lines (this will automatically set brakes), release fifth wheel latch, drain dolly air tank, lower trailer landing gear.
D) Drain dolly air tank, lower landing gear, disconnect air/electrical lines, release fifth wheel latch.
How much space should be between the upper and lower fifth wheel on the rear trailer?
of an inch.
of an inch.
D) it depends on the weight of the trailer.
The most important space to manage around your vehicle when driving at highway speed is
A) the space behind you.
B) the spaces to either side of you.
C) the space you are driving into (front).
D) overhead clearance.
A good way to manage space around your vehicle is to
A) keep a safe following distance.
B) keep up with the speed of the fastest traffic.
C) avoid driving next to other vehicles.
D) Both A and C
One popular safe distance rule recommends a following distance/time of one second per 10 feet of vehicle length (add one second for speeds over 40 mph). Based on that rule, the following distance for a sixty-foot rig at sixty miles an hour should be
A) 4 seconds.
B) 5 seconds.
C) 6 seconds.
D) 7 seconds.
During, the "crack-the-whip" effect that occurs on trucks with trailers, which is most likely to tip over?
A) The rear trailer of a double
B) A full trailer behind a truck
C) The rear trailer of a triple
D) The tractor
You are driving a 100 foot truck with double trailers at 60 mph. The road is dry. Visibility is good. You should keep at least ____ seconds of space ahead of you.
If you must drive through flowing water or wide stretches of standing water, which of these should you do?
A) Drive through quickly
B) Use a lower gear
C) Brake hard
D) Brake hard and downshift
When should you check your mirrors while making a lane change?
A) Before signaling the change
B) Before starting the lane change
C) After completing the lane change
D) All of these
Which of these in NOT a good thing to do when driving on slippery roads?
A) Use the engine brake or speed retarder
B) Use a light touch on the accelerator and brake pedals
C) Avoid driving near other vehicles
D) Manage the space around your vehicle
Time is Up!