Doubles And Triples Endorsement Test

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

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

6 seconds

12 seconds

8 seconds

9 seconds

2 / 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...?

Slow down further

Maintain your speed

Accelerate slightly

Accelerate hard

3 / 30

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

The first trailer

The middle trailer

The tractor

The last trailer

4 / 30

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

More things to go wrong

Any of these depending on vehicle

Fewer things to go wrong

The same amount of things to go wrong

5 / 30

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

In any of these places

In the middle of the combination

At the rear of the combination

Directly behind the tractor

6 / 30

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

As stable

Any of these depending on vehicle

Less stable

More stable

7 / 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

8 / 30

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

Passive

Fast

Aggressive

Smooth

9 / 30

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

Only connect on flat terrain

Make sure another tractor is parked behind it

Refuse to connect it

Chock the wheels

10 / 30

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

Four times

Three times

Two times

Five times

11 / 30

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

Apply the brakes

Decrease speed

Regain traction

Increase speed

12 / 30

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

The engine brake

The foot brake

The speed retarder

The engine brake or speed retarder

13 / 30

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

The kingpin

A monkey wrench

The electrical control

The parking brake control

14 / 30

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

Offramps

Upgrades

Urban areas

High-speed highways

15 / 30

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

After signaling the lane change

At all these points

While completing the lane change

After starting the lane change

16 / 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 disconnecting 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 connecting the emergency line

17 / 30

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

Sharply

Timidly

Aggressively

Gently

18 / 30

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

On ramps

Off ramps

Intersections

Any of these points

19 / 30

A converter gear on a dolly is...?

An air connection

A fuel connection

A coupling device

An electrical connection

20 / 30

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

Heavier

More powered wheels

Lighter

More dead axles

21 / 30

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

On the left side

On the roof

On the right side

To the rear

22 / 30

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

Fully loaded trailers

Empty trailers

They are all the same

Half full trailers

23 / 30

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

Increased

The same

Decreased

Any of these depending on circumstances

24 / 30

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

8 seconds

12 seconds

15 seconds

10 seconds

25 / 30

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

All trailers and tractor equally

The first trailer

The second trailer

The tractor

26 / 30

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

Aggressively

Quickly

At the speed limit

Slowly

27 / 30

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

Do any of these

Pull straight out

Pull out to the left

Pull out to the right

28 / 30

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

2001

1998

1995

2004

29 / 30

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

Using the parking brakes

Closing the air tank petcock

Uncoupling the electrical connections

Opening the air tank petcock

30 / 30

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

Time

Space

All of these

Distance

Your score is

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