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

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

Ignored

Noted

Replaced

Bent into shape

2 / 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

3 / 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

Gently pull forward

Push the trailer by hand

4 / 30

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

Apply the parking brake

Push in the trailer air supply knob

Pump the foot brake

Do all these things

5 / 30

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

Needle hook

Pintle hook

Fisheye hook

Claw hook

6 / 30

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

The shutoff valves at the rear of the last trailer

The shutoff valves at the rear of the middle trailer

The shutoff valves at the rear of the front trailer

Any of these

7 / 30

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

Give slightly under pressure

Be very slack

Have enough slack for turns

Be very taut

8 / 30

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

The hand valve

The foot brake

The parking brake

Any of these

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 hand

By pushing it with your tractor

By pulling it with your tractor

10 / 30

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

10 – 20 psi

20 – 45 psi

30 – 50 PSI

40 – 60 PSI

11 / 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 higher than the center of the fifth wheel

Slightly lower than the center of the fifth wheel

12 / 30

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

Releasing the spring brakes

Chocking the wheels

Raising the landing gear

Lowering the landing gear

13 / 30

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

Push it with your tractor

Move it by hand

Couple it to your tractor

Couple it to your first semitrailer

14 / 30

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

You could lose tractor brake power

The emergency brakes could come on

Any of these things could happen

You could lose all brake power

15 / 30

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

All of them

Light cords

Safety chains

The spare tire

16 / 30

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

A separate vehicle

Hand power

The tractor

The tractor and the first semitrailer

17 / 30

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

Grease

Water

Play

Oil

18 / 30

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

Half closed

Closed

Any of these

Open

19 / 30

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

The foot brake

The parking brake

The hand valve

Any of these

20 / 30

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

The landing gear

Old tires

Chocks

A dolly

21 / 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

22 / 30

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

Any of these

The head of the kingpin

The shank of the kingpin

The base of the kingpin

23 / 30

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

Through the front trailer

All the way to the rear

Any of these

Through the middle trailer

24 / 30

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

The air hoses

Any of these

The landing gear

The wheels of the next trailer

25 / 30

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

Open

Any of these

Half closed

Closed

26 / 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...?

Open – closed – closed

Open – open – closed

Closed – open – closed

Closed – closed – open

27 / 30

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

Raise the landing gear

Charge the brakes

Visually check the coupling

Connect the safety chains

28 / 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

29 / 30

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

Two

Three

One

Many

30 / 30

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

Pulling against the pin

Pushing the front trailer

Pushing the rear trailer

Driving around a parking lot

Your score is

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