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 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

2 / 30

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

Closed

Open

Half closed

Any of these

3 / 30

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

Any of these

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

4 / 30

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

Lowering the landing gear

Raising the landing gear

Chocking the wheels

Releasing the spring brakes

5 / 30

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

The tractor

The tractor and the first semitrailer

A separate vehicle

Hand power

6 / 30

Light cords should be attached to...?

The front of the first trailer

All of these

The front of the middle trailer

The front of the rear trailer

7 / 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

Any of these things could happen

The emergency brakes could come on

You could lose all brake power

8 / 30

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

Many

Three

One

Two

9 / 30

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

Fisheye hook

Needle hook

Pintle hook

Claw hook

10 / 30

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

Ignored

Replaced

Bent into shape

Noted

11 / 30

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

Charge the brakes

Raise the landing gear

Visually check the coupling

Connect the safety chains

12 / 30

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

Through the middle trailer

Through the front trailer

All the way to the rear

Any of these

13 / 30

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

The base of the kingpin

The shank of the kingpin

Any of these

The head of the kingpin

14 / 30

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

The hand valve

The parking brake

The foot brake

Any of these

15 / 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

1 inch

0.5 inches

0 inches

16 / 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

17 / 30

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

Oil

Play

Grease

Water

18 / 30

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

By pushing it with a smaller vehicle

By pulling it with your tractor

By hand

By pushing it with your tractor

19 / 30

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

The wheels of the next trailer

Any of these

The landing gear

The air hoses

20 / 30

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

Any of these

Ground sloping slightly uphill

Ground sloping slightly downhill

Level ground

21 / 30

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

Push the trailer by hand

Accelerate harshly

Try to reverse

Gently pull forward

22 / 30

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

Driving around a parking lot

Pushing the rear trailer

Pulling against the pin

Pushing the front trailer

23 / 30

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

Safety chains

Light cords

The spare tire

All of them

24 / 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

Open – open – closed

Closed – open – closed

25 / 30

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

A dolly

The landing gear

Old tires

Chocks

26 / 30

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

The parking brake

The foot brake

Any of these

The hand valve

27 / 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

40 – 60 PSI

10 – 20 psi

20 – 45 psi

28 / 30

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

Any of these

Open

Half closed

Closed

29 / 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

30 / 30

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

Be very slack

Give slightly under pressure

Have enough slack for turns

Be very taut

Your score is

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