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

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

2 / 30

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

The hand valve

Any of these

The parking brake

The foot brake

3 / 30

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

Accelerate harshly

Gently pull forward

Push the trailer by hand

Try to reverse

4 / 30

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

Closed

Half closed

Open

Any of these

5 / 30

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

Pushing the rear trailer

Pulling against the pin

Driving around a parking lot

Pushing the front trailer

6 / 30

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

Any of these

The landing gear

The air hoses

The wheels of the next trailer

7 / 30

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

Chocking the wheels

Raising the landing gear

Lowering the landing gear

Releasing the spring brakes

8 / 30

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

Old tires

Chocks

A dolly

The landing gear

9 / 30

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

The hand valve

The foot brake

The parking brake

Any of these

10 / 30

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

Noted

Replaced

Bent into shape

Ignored

11 / 30

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

One

Two

Many

Three

12 / 30

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

Light cords

Safety chains

All of them

The spare tire

13 / 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

14 / 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

Open – closed – closed

Closed – open – closed

15 / 30

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

Hand power

The tractor and the first semitrailer

A separate vehicle

The tractor

16 / 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

30 – 50 PSI

40 – 60 PSI

20 – 45 psi

17 / 30

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

Play

Water

Oil

Grease

18 / 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

19 / 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 tractor brake power

You could lose all brake power

20 / 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

21 / 30

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

Connect the safety chains

Visually check the coupling

Charge the brakes

Raise the landing gear

22 / 30

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

Fisheye hook

Needle hook

Claw hook

Pintle hook

23 / 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

24 / 30

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

Be very taut

Be very slack

Give slightly under pressure

Have enough slack for turns

25 / 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

26 / 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 pushing it with your tractor

By hand

27 / 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

Push it with your tractor

Couple it to your first semitrailer

28 / 30

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

Slightly higher than the center of the fifth wheel

Slightly lower than the center of the fifth wheel

Well above the center of the fifth wheel

Level with the center of the fifth wheel

29 / 30

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

Push in the trailer air supply knob

Apply the parking brake

Do all these things

Pump the foot brake

30 / 30

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

Any of these

Closed

Half closed

Open

Your score is

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