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

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

Play

Water

Oil

Grease

2 / 30

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

Any of these

The base of the kingpin

The shank of the kingpin

The head of the kingpin

3 / 30

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

Try to reverse

Gently pull forward

Accelerate harshly

Push the trailer by hand

4 / 30

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

Be very slack

Have enough slack for turns

Be very taut

Give slightly under pressure

5 / 30

Light cords should be attached to...?

The front of the rear trailer

The front of the middle trailer

The front of the first trailer

All of these

6 / 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

7 / 30

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

The air hoses

Any of these

The wheels of the next trailer

The landing gear

8 / 30

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

Any of these

The parking brake

The hand valve

The foot brake

9 / 30

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

By pushing it with a smaller vehicle

By pushing it with your tractor

By pulling it with your tractor

By hand

10 / 30

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

Three

Many

One

Two

11 / 30

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

Through the middle trailer

All the way to the rear

Any of these

Through the front trailer

12 / 30

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

Pushing the front trailer

Driving around a parking lot

Pushing the rear trailer

Pulling against the pin

13 / 30

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

Raising the landing gear

Releasing the spring brakes

Chocking the wheels

Lowering the landing gear

14 / 30

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

A separate vehicle

The tractor and the first semitrailer

The tractor

Hand power

15 / 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 – closed – open

Open – closed – closed

Closed – open – closed

Open – open – closed

16 / 30

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

Safety chains

The spare tire

All of them

Light cords

17 / 30

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

1.5 inches

0 inches

1 inch

0.5 inches

18 / 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 middle trailer

The shutoff valves at the rear of the front trailer

19 / 30

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

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

Slightly lower than the center of the fifth wheel

20 / 30

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

Move it by hand

Couple it to your tractor

Push it with your tractor

Couple it to your first semitrailer

21 / 30

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

Raise the landing gear

Connect the safety chains

Charge the brakes

Visually check the coupling

22 / 30

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

Noted

Replaced

Ignored

Bent into shape

23 / 30

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

Do all these things

Pump the foot brake

Apply the parking brake

Push in the trailer air supply knob

24 / 30

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

Pintle hook

Fisheye hook

Needle hook

Claw hook

25 / 30

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

The foot brake

Any of these

The parking brake

The hand valve

26 / 30

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

Any of these

Closed

Open

Half closed

27 / 30

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

Level ground

Ground sloping slightly downhill

Any of these

Ground sloping slightly uphill

28 / 30

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

30 – 50 PSI

10 – 20 psi

40 – 60 PSI

20 – 45 psi

29 / 30

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

Half closed

Open

Any of these

Closed

30 / 30

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

A dolly

Old tires

Chocks

The landing gear

Your score is

Studying and applying oneself is the only way to successfully learn the information you need to know to pass all testing required to obtain your CDL. We are here to help.

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