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

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

Any of these

The air hoses

The wheels of the next trailer

The landing gear

2 / 30

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

Needle hook

Fisheye hook

Pintle hook

Claw hook

3 / 30

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

Level ground

Any of these

Ground sloping slightly downhill

Ground sloping slightly uphill

4 / 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

5 / 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

6 / 30

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

Pump the foot brake

Push in the trailer air supply knob

Do all these things

Apply the parking brake

7 / 30

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

Two

One

Three

Many

8 / 30

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

The shank of the kingpin

The base of the kingpin

Any of these

The head of the kingpin

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...?

Open – open – closed

Closed – closed – open

Closed – open – closed

Open – closed – closed

10 / 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

Couple it to your first semitrailer

Couple it to your tractor

Move it by hand

11 / 30

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

Oil

Play

Water

Grease

12 / 30

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

Bent into shape

Replaced

Ignored

Noted

13 / 30

Light cords should be attached to...?

The front of the middle trailer

All of these

The front of the rear trailer

The front of the first trailer

14 / 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 front trailer

Any of these

The shutoff valves at the rear of the middle trailer

15 / 30

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

Any of these things could happen

You could lose tractor brake power

You could lose all brake power

The emergency brakes could come on

16 / 30

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

Open

Any of these

Closed

Half closed

17 / 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

Level with the center of the fifth wheel

Slightly lower than the center of the fifth wheel

Slightly higher than the center of the fifth wheel

18 / 30

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

0 inches

1 inch

0.5 inches

1.5 inches

19 / 30

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

Through the front trailer

Through the middle trailer

All the way to the rear

Any of these

20 / 30

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

Open

Half closed

Any of these

Closed

21 / 30

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

Chocking the wheels

Releasing the spring brakes

Raising the landing gear

Lowering the landing gear

22 / 30

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

Try to reverse

Accelerate harshly

Gently pull forward

Push the trailer by hand

23 / 30

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

The parking brake

The hand valve

Any of these

The foot brake

24 / 30

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

Pulling against the pin

Pushing the rear trailer

Pushing the front trailer

Driving around a parking lot

25 / 30

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

A dolly

Chocks

The landing gear

Old tires

26 / 30

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

Any of these

The parking brake

The hand valve

The foot brake

27 / 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 pushing it with a smaller vehicle

By pulling it with your tractor

28 / 30

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

Visually check the coupling

Connect the safety chains

Charge the brakes

Raise the landing gear

29 / 30

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

Hand power

A separate vehicle

The tractor

The tractor and the first semitrailer

30 / 30

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

Be very taut

Give slightly under pressure

Be very slack

Have enough slack for turns

Your score is

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