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

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

Claw hook

Needle hook

Fisheye hook

Pintle hook

2 / 30

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

Be very taut

Be very slack

Have enough slack for turns

Give slightly under pressure

3 / 30

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

Pushing the front trailer

Pulling against the pin

Pushing the rear trailer

Driving around a parking lot

4 / 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

40 – 60 PSI

10 – 20 psi

30 – 50 PSI

5 / 30

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

Bent into shape

Ignored

Replaced

Noted

6 / 30

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

By pushing it with your tractor

By pulling it with your tractor

By hand

By pushing it with a smaller vehicle

7 / 30

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

The landing gear

A dolly

Old tires

Chocks

8 / 30

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

Accelerate harshly

Push the trailer by hand

Gently pull forward

Try to reverse

9 / 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

Open – closed – closed

Open – open – closed

Closed – closed – open

10 / 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

11 / 30

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

Light cords

All of them

Safety chains

The spare tire

12 / 30

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

Two

Many

Three

One

13 / 30

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

Charge the brakes

Connect the safety chains

Raise the landing gear

Visually check the coupling

14 / 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

15 / 30

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

0 inches

0.5 inches

1 inch

1.5 inches

16 / 30

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

Any of these

The shank of the kingpin

The head of the kingpin

The base of the kingpin

17 / 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

Any of these things could happen

You could lose all brake power

You could lose tractor brake power

18 / 30

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

The hand valve

The foot brake

Any of these

The parking brake

19 / 30

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

Half closed

Open

Closed

Any of these

20 / 30

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

The shutoff valves at the rear of the front trailer

Any of these

The shutoff valves at the rear of the middle trailer

The shutoff valves at the rear of the last trailer

21 / 30

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

Open

Half closed

Any of these

Closed

22 / 30

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

The air hoses

The landing gear

The wheels of the next trailer

Any of these

23 / 30

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

Water

Oil

Grease

Play

24 / 30

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

Level ground

Ground sloping slightly uphill

Ground sloping slightly downhill

Any of these

25 / 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

Move it by hand

Couple it to your first semitrailer

Push it with your tractor

26 / 30

Light cords should be attached to...?

All of these

The front of the first trailer

The front of the rear trailer

The front of the middle trailer

27 / 30

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

Pump the foot brake

Apply the parking brake

Do all these things

Push in the trailer air supply knob

28 / 30

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

The parking brake

Any of these

The hand valve

The foot brake

29 / 30

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

Lowering the landing gear

Raising the landing gear

Releasing the spring brakes

Chocking the wheels

30 / 30

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

Level with the center of the fifth wheel

Well above the center of the fifth wheel

Slightly lower than the center of the fifth wheel

Slightly higher than the center of the fifth wheel

Your score is

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