DMV DOUBLES TRIPLES PRACTICE TEST – 02

The DMV doubles triples practice 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 02

1 / 30

Once you have coupled your rear trailer, you should test the coupling by...?

Pushing the rear trailer

Driving around a parking lot

Pulling against the pin

Pushing the front trailer

2 / 30

When uncoupling a rear trailer, you should remove some weight from the dolly by...?

Releasing the spring brakes

Chocking the wheels

Lowering the landing gear

Raising the landing gear

3 / 30

On double and triple combinations, you must make sure that which of these is secure?

Light cords

All of them

The spare tire

Safety chains

4 / 30

Light cords should be attached to...?

The front of the middle trailer

The front of the rear trailer

The front of the first trailer

All of these

5 / 30

Converter dollies are connected to front trailers with a...?

Claw hook

Pintle hook

Needle hook

Fisheye hook

6 / 30

In the coupling system, the locking jaws should be fixed around...?

The shank of the kingpin

Any of these

The base of the kingpin

The head of the kingpin

7 / 30

On a triple combination, the shutoff valves on the rear of the last trailer should be...?

Any of these

Closed

Half closed

Open

8 / 30

In this order, the shutoff valves at the rear of front trailers, the rear of the last trailer and the converter dolly air tank drain valve should be...?

Closed – open – closed

Closed – closed – open

Open – closed – closed

Open – open – closed

9 / 30

If your converter dolly has to be moved over a distance to bring it to your semitrailer, you should...?

Couple it to your tractor

Couple it to your first semitrailer

Move it by hand

Push it with your tractor

10 / 30

When uncoupling a rear trailer, your rig should be parked in a straight line on...?

Level ground

Ground sloping slightly downhill

Ground sloping slightly uphill

Any of these

11 / 30

If the fifth wheel on a coupling is too far forward, the tractor frame may hit...?

The wheels of the next trailer

The landing gear

Any of these

The air hoses

12 / 30

Your tractor protection valve control should pop out, or go from normal to emergency position, when air pressure falls into what range?

20 – 45 psi

10 – 20 psi

30 – 50 PSI

40 – 60 PSI

13 / 30

The final procedure when connecting a rear trailer is to...?

Raise the landing gear

Charge the brakes

Connect the safety chains

Visually check the coupling

14 / 30

On a triple combination, the shutoff valves at the rear off the middle trailer should be...?

Open

Half closed

Closed

Any of these

15 / 30

When checking your air lines, they must be secure and...?

Have enough slack for turns

Be very taut

Be very slack

Give slightly under pressure

16 / 30

Before coupling a trailer, you should make sure it is at the right height using...?

A dolly

Old tires

The landing gear

Chocks

17 / 30

When connecting a converter dolly to a rear trailer, the trailer height must be adjusted so that it is...?

Slightly lower than the center of the fifth wheel

Well above the center of the fifth wheel

Slightly higher than the center of the fifth wheel

Level with the center of the fifth wheel

18 / 30

For all brakes to work on a triple combination, you must have air supply...?

Through the middle trailer

Through the front trailer

Any of these

All the way to the rear

19 / 30

If your tractor protection valve doesn't work properly, then if an air hose starts to leak what could happen?

The emergency brakes could come on

You could lose all brake power

Any of these things could happen

You could lose tractor brake power

20 / 30

In normal operation, trailer service brakes should be operated by...?

The parking brake

The foot brake

The hand valve

Any of these

21 / 30

You can test that air is flowing to all trailers by opening...?

The shutoff valves at the rear of the last trailer

Any of these

The shutoff valves at the rear of the front trailer

The shutoff valves at the rear of the middle trailer

22 / 30

To check air flows to all trailers, you should let air pressure reach normal then...?

Push in the trailer air supply knob

Pump the foot brake

Apply the parking brake

Do all these things

23 / 30

A bent or damaged kingpin on a coupling should be...?

Bent into shape

Ignored

Replaced

Noted

24 / 30

The coupling between a rear trailer and a dolly should have a space between the upper and lower fifth wheels of...?

1 inch

0.5 inches

0 inches

1.5 inches

25 / 30

A dolly should be pulled out from a rear trailer using...?

A separate vehicle

The tractor and the first semitrailer

Hand power

The tractor

26 / 30

If the converter dolly is close to your semitrailer, you should wheel it into position...?

By pushing it with your tractor

By hand

By pulling it with your tractor

By pushing it with a smaller vehicle

27 / 30

To check that the trailer emergency brakes are working properly, you should pull out the trailer air supply control and...?

Accelerate harshly

Try to reverse

Push the trailer by hand

Gently pull forward

28 / 30

When checking the fifth wheel, you should make sure that it has enough...?

Grease

Oil

Water

Play

29 / 30

When testing trailer service brakes, you should use...?

Any of these

The hand valve

The foot brake

The parking brake

30 / 30

How many different ways of coupling and uncoupling trailer combinations are there?

Three

Two

Many

One

Your score is

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