DOUBLES AND TRIPLES ENDORSEMENT TEST – 01

The CDL doubles and triples endorsement test will examine your knowledge of pulling double/triple trailers, coupling and uncoupling, inspecting doubles and triples, and checking air brakes. In order to receive your Doubles and Triples endorsement, it is required that you pass the state’s official CDL written Knowledge exam.

Doubles & Triples Endorsement Test 01

1 / 30

Compared to smaller commercial vehicles, double/triple combinations need more...?

Distance

Space

Time

All of these

2 / 30

When parking a double/triple combination, you should arrange things so that you can...?

Do any of these

Pull out to the left

Pull straight out

Pull out to the right

3 / 30

With a double/triple combination, which of these will take longer to stop?

Empty trailers

They are all the same

Fully loaded trailers

Half full trailers

4 / 30

When driving a double/triple combination, you should avoid changing lanes near...?

Off ramps

Intersections

On ramps

Any of these points

5 / 30

In a combination vehicle on slippery roads, you should not use...?

The speed retarder

The foot brake

The engine brake or speed retarder

The engine brake

6 / 30

When driving a double/triple combination, compared to a straight truck or single, your following distance should be...?

Decreased

Increased

Any of these depending on circumstances

The same

7 / 30

A converter dolly equipped with antilock brakes will have a yellow lamp...?

On the roof

To the rear

On the right side

On the left side

8 / 30

If you have any doubts about the brakes on your second trailer when connecting, you should...?

Chock the wheels

Make sure another tractor is parked behind it

Refuse to connect it

Only connect on flat terrain

9 / 30

Compared to other commercial vehicles, doubles/triples have...?

The same amount of things to go wrong

Fewer things to go wrong

Any of these depending on vehicle

More things to go wrong

10 / 30

When driving a double/triple, to prevent rollover you must steer...?

Sharply

Timidly

Gently

Aggressively

11 / 30

When driving a double/triple combination, you need to plan far ahead so that you can keep your driving...?

Smooth

Aggressive

Passive

Fast

12 / 30

In comparison with other commercial vehicles, doubles/triples are...?

Less stable

As stable

Any of these depending on vehicle

More stable

13 / 30

If your speed doubles, your stopping distance increases...?

Two times

Five times

Three times

Four times

14 / 30

You are driving a 110 foot long combination vehicle at 55 mph. What should your following distance be?

12 seconds

8 seconds

10 seconds

15 seconds

15 / 30

The most important thing to do if your vehicle starts skidding is to...?

Regain traction

Apply the brakes

Decrease speed

Increase speed

16 / 30

When inspecting a double/triple combination, you should give special attention to...?

All trailers and tractor equally

The second trailer

The tractor

The first trailer

17 / 30

Converter dollies will have antilock brakes if they were built on or after March 1...?

1995

2004

2001

1998

18 / 30

If you are coupling your second trailer and it doesn't have spring brakes, you can apply the emergency brakes by...?

Charging the air tank and connecting the emergency line

Emptying the air tank and disconnecting the emergency line

Charting the air tank and disconnecting the emergency line

Charging the air tank and disconnecting the emergency line

19 / 30

Corners when driving a double/triple should be taken...?

At the speed limit

Aggressively

Quickly

Slowly

20 / 30

Why are double/triple combinations more likely to skid in adverse conditions?

More dead axles

More powered wheels

Heavier

Lighter

21 / 30

In which of these environments should you be especially cautious about tipping over a double/triple?

Urban areas

Offramps

High-speed highways

Upgrades

22 / 30

On long downgrades, your trailer brakes should be used...?

To stop your speed increasing

For all of these purposes

Only for taking curves

To reduce speed

23 / 30

A converter gear on a dolly is...?

A fuel connection

A coupling device

An air connection

An electrical connection

24 / 30

When taking a curve in a double/triple combination, you should slow down to a safe speed before entering, then during the curve you should...?

Accelerate hard

Accelerate slightly

Slow down further

Maintain your speed

25 / 30

If a converter dolly has air brakes, you should release them by...?

Uncoupling the electrical connections

Closing the air tank petcock

Opening the air tank petcock

Using the parking brakes

26 / 30

In a double/triple combination, which of these is the most likely to turn over?

The first trailer

The tractor

The middle trailer

The last trailer

27 / 30

When driving a double/triple combination which is 90 feet long at 30 mph, how much following distance should you allow?

8 seconds

6 seconds

9 seconds

12 seconds

28 / 30

For the safest handling on the road, your most heavily loaded trailer should go...?

At the rear of the combination

Directly behind the tractor

In any of these places

In the middle of the combination

29 / 30

When making a lane change in a double/triple combination, you must check your mirrors...?

After signaling the lane change

After starting the lane change

While completing the lane change

At all these points

30 / 30

On converter dollies with spring brakes, you should release them with...?

The parking brake control

The kingpin

A monkey wrench

The electrical control

Your score is

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