CDL Double-Triple
Trailers Test

This is the Commercial Vehicle Driver's License Test covering Double and Triple Trailers. You will be presented with 40 questions and you must answer 34 questions correctly to pass. There is no time limit. You may not go back once you answer a question. Click the "Start Quiz" button below to begin. Good luck!

1 / 40

Select the true statement in regards to a converter dolly:

it is a connecting device consisting of one axle which disconnects a semitrailer combination vehicle converting it into two separate trailers

none of the answers listed

it is a coupling device with only two axles and a sixth wheel to which a semitrailer can be coupled to the rear of a tractor-trailer combination forming a double bottom rig

it is a coupling device with one or two axles and a fifth wheel with which a semitrailer can be coupled to the rear of a tractor-trailer combination forming a double bottom rig

2 / 40

Start by___when coupling.

coupling the converter hook to the pintle tongue of the first trailer

coupling the tractor to the second trailer

having the second trailer against the dock

backing the converter dolly under the second trailer

3 / 40

The pintle hook should be_____ and the converter dolly air tank drain valve is___when doing a walk around inspection of a triple or double trailer.

free, closed

free, open

latched, open

latched, closed

4 / 40

What should you hear when you test the trailer brakes by opening the service air line at rear of trailer with the hand valve on?

the service brakes will move to a fully applied position

none of the answers listed

the emergency air line will release air

you should hear air escape from the open valve

5 / 40

If you are driving a 100-foot truck with double trailers at 30 mph in dry conditions, how many seconds of space should there be between your truck and other vehicles?

6 / 40

How should the pintle hook be when backing a dolly under the second trailer?

in the latched position

removed from the dolly

in the unlatched position

in a halfway open position

7 / 40

How should the shut off valves at the rear of the trailer be when inspecting doubles?

closed at the rear of the last trailer and open at the rear of the front trailer

none of the answers listed

open at the rear of the last trailer and front trailer

closed at the rear of the last trailer and front trailer

8 / 40

What should you hear when you have the hand valve on and are testing the trailer brakes by opening the service air line at the back of the trailer?

the service brakes more to a fully applied position

the engine brake to kick on

the emergency line valve to release air

air leaving the open valve

9 / 40

Select the true statement in regards to handing triples and doubles

due to the crack the whip effect, the rear trailer of a 100 foot triple is less likely to tip than a single trailer

a sudden movement of the steering wheel may result in the rear trailer tipping over

none of the answers listed

due to off tracking, a triple bottom rig can come to a stop quicker than a 5 axle semi trailer

10 / 40

You don't want to use wheel chocks when hooking a combination to a second trailer with no spring brakes. What should you do?

use a portable generator to supply brake pressure

supply air to the trailer air system via the tractor and then disconnect the emergency line

none of the answers listed

make sure the trailer will not roll away when coupling

11 / 40

In what position should shut off valves on the rear of the last trailer be in on a set of double trailers?

in a open position

in a open position for the rear trailer and a closed position for the front trailer

in a closed position

in a closed position for the rear trailer and open position for the front trailers

12 / 40

Select the statement of what you should not do if you are required to drive through flowing water or deep puddles.

drive at a high speed

shift into a lower gear

increase engine rpm

quickly turn the steering wheel side to side

13 / 40

The crack-the-whip effect is more likely to cause the front trailer to tip over.

trailers never tip

true

false

there is an equal chance for trailers to tip

14 / 40

Why is it dangerous to unlock the pintle hook with the dolly still under the rear trailer?

the kingpin may snap in half

the dolly tow bar may fly up

the fifth wheel may be misaligned

the spring brakes may release

15 / 40

Select the true statement about convex ("spot") mirrors.

they make things closer and larger than they really are

they are against the law in the majority of states

you do not need to look at them as often as flat mirrors

they make things look farther away and smaller than they actually are

16 / 40

What is the best way to stop all skids?

use controlled or stab braking

restore traction back to the tires

quickly turn the steering wheel side to side

accelerate and countersteer

17 / 40

When driving with multiple trailers, which one should be right behind the tractor?

the trailer with the smallest road

the trailer with the heaviest load

the trailers shortest in length

the trailer longest in length

18 / 40

What is most likely to occur when driving double and a set of trailer wheels goes into a skid?

the rig will continue straight ahead but will slide sideways

the tractor will continue moving in a straight line no matter how you turn the steering wheel

none of the answers listed

the trailer will jackknife

19 / 40

What do you need to do to supply air to the air tranks of the second trailer?

none of the answers listed

open up the shutt off valves on the rear of the first trailer and close the shut off valve at the back of the second trailer

open the shut off valve at the back of both trailers

close the shut off valves at the back of each trailer

20 / 40

What is the best way to prevent brakes form overheating while drive down a steep grade?

use the trailer brakes only

drive at a speed of 5 mph below your safe speed

use the stab braking method

use countersteering practices

21 / 40

How do you secure a second trailer to your combination vehicle?

use emergency air brakes, spring brakes, and wheel chocks together

use the emergency air brakes or the trailer's spring brakes only

none of the answers listed

use wheel chocks only

22 / 40

Select the true statement about double or triple trailers.

all answers listed

they present a rearward amplification hazard

they can have a dangerous "crack the whip" effect

they can roll over duee to abrupt steering movements

23 / 40

Select the true statement in regards to quick steering movements and double trailers:

it is easier to countersteer doubles/triples than other vehicles

you should apply a firm pressure to the brake pedal at the same moment you do quick steering movements

it is easier to tip doubles and triples from quick steering movements than other vehicles

nothing will occur

24 / 40

What is the stopping distance for a tractor trailer that is traveling at 55 mph on dry pavement?

about 200 feet which is 2/3 of a football field

about 600 feet with is about two football field lengths

about 150 feet which is 1/2 of a football field

about 300 feet which is about a football field length

25 / 40

What position should the heaviest trailer be in when pulling 3 trailers?

in the front

it makes no difference

in the back

in the middle

26 / 40

Select the action that is not recommended when driving on slipper roads:

use a speed retarder or engine brake

keep other drivers out of your side space

use a light pressure with the the brake and accelerator pedals

none of the answers listed

27 / 40

How much space should you see between the lower and upper fifth wheel when checking the coupling of a converter dolly?

it depends on how heavy the load is

1/2 to 1 inch

none

1 to 1 1/2 inches

28 / 40

Select the true statement about seeing ahead.

good drivers will shift their attention from far and near and back and forth

you should look up to 1/4 mile ahead when driving at highway speeds

many individuals do not look far enough ahead while driving

all answers listed

29 / 40

How should you inspect a converter dolly?

as if it is an engine

as if it is cargo

as if it is an axle with a fifth wheel

as if it is a trailer

30 / 40

How much space should there be between the lower and upper fifth wheel?

1/4 to 1/2 of an inch

zero

it is dependent on the load you are carrying

1 to 2 inches

31 / 40

To be sure that air is supplied to the second trailer:

crank the engine brake

open the emergency line shut off at the back of the second trailer

keep an eye of the air gauge for a drop of 30 psi

while driving at 10 mph, use the hand valve. The vehicle should stop in the same distance of a single trailer moving at 5 mph

32 / 40

You should_____to uncouple the converter dolly.

lower the landing gear, disconnect the safety chain, and chock the wheels

chock the wheels, disconnect the safety chains, and then lower the landing gear

disconnect the safey chains, lower the landing gear, and chock the wheels

chock the wheels, lower the landing gear, and disconnect the safey chains

33 / 40

In what position should the converter dolly air tank drain valves and pintle hook be in?

closed and open

open and latched

closed and latched

open and open

34 / 40

What should you check for when inspecting a converter dolly?

that the converter dolly air tank drain valve is in the closed position

all answers listed

that the safety chains are secured to the trailer

that the spare tire is secured if there is one

35 / 40

What are the 3 methods for securing a second trailer before coupling?

parking on level ground, chocking the tires, and charging the trailer air tank if it doesn't have spring brakes

chocking the tires, parking on level ground, and charging the air tank

parking against another trailer, locking the trailer door, and chocking the tires

all answers listed

36 / 40

You should check your mirrors while making a lane change:

all answers listed

right after you start the lane change

after you signal your intent to change lanes

after you have completed the lane change

37 / 40

Select the statement that is true in regards to what is required of a driver with a double or triple trailers:

increase your following distance

none of the answers listed

all of the answers listed

drive with extra care in mountains and in bad weather

38 / 40

Select the statement that is true in regards to managing space to the sides.

high gust winds do not cause any issues for triples and doubles

you should try to avoid driving next to others when possible

you should always keep your vehicle to the right side of the lane

all answers listed

39 / 40

Your rig should be parked on__to uncouple double trailers.

grass

a downgrade

the company's lot

level ground

40 / 40

Select the true statement in regards to driving a truck with triple or double trailers:

the truck requires increased following distance compared to smaller vehicles

extra care should be taken when driving in bad weather and in the mountains

all answers listed

the risk of trailer jackknifes and tipping is increased compared to shorter trucks

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Hazardous Materials Test

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CDL Double-Triple
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