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

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

Give slightly under pressure

Be very slack

Be very taut

Have enough slack for turns

3 / 30

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

Visually check the coupling

Raise the landing gear

Connect the safety chains

Charge the brakes

4 / 30

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

The parking brake

The hand valve

Any of these

The foot brake

5 / 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

The emergency brakes could come on

You could lose all brake power

You could lose tractor brake power

6 / 30

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

Old tires

Chocks

A dolly

The landing gear

7 / 30

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

One

Two

Three

Many

8 / 30

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

Claw hook

Fisheye hook

Needle hook

Pintle hook

9 / 30

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

Do all these things

Pump the foot brake

Push in the trailer air supply knob

Apply the parking brake

10 / 30

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

By pushing it with your tractor

By pushing it with a smaller vehicle

By pulling it with your tractor

By hand

11 / 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 tractor

Move it by hand

Couple it to your first semitrailer

12 / 30

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

Ground sloping slightly uphill

Ground sloping slightly downhill

Level ground

Any of these

13 / 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 – open – closed

Closed – closed – open

Open – closed – closed

14 / 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

30 – 50 PSI

10 – 20 psi

40 – 60 PSI

15 / 30

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

0.5 inches

1.5 inches

1 inch

0 inches

16 / 30

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

The wheels of the next trailer

The air hoses

The landing gear

Any of these

17 / 30

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

Safety chains

Light cords

All of them

The spare tire

18 / 30

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

Open

Half closed

Any of these

Closed

19 / 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

20 / 30

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

Lowering the landing gear

Releasing the spring brakes

Chocking the wheels

Raising the landing gear

21 / 30

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

Play

Water

Oil

Grease

22 / 30

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

Through the front trailer

Any of these

Through the middle trailer

All the way to the rear

23 / 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

24 / 30

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

Hand power

The tractor and the first semitrailer

The tractor

A separate vehicle

25 / 30

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

Closed

Half closed

Any of these

Open

26 / 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

27 / 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

28 / 30

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

The parking brake

The foot brake

The hand valve

Any of these

29 / 30

Light cords should be attached to...?

The front of the rear trailer

All of these

The front of the middle trailer

The front of the first trailer

30 / 30

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

The shutoff valves at the rear of the middle trailer

The shutoff valves at the rear of the front trailer

Any of these

The shutoff valves at the rear of the last trailer

Your score is

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