Instructions

Double

This endorsement is required if the driver will pull two or three trailers. To receive this endorsement, applicants must pass a test. The test consists of 20 multiple choice.. Read More

This endorsement is required if the driver will pull two or three trailers. To receive this endorsement, applicants must pass a test. The test consists of 20 multiple choice questions. To pass, the applicant must answer at least 16 questions correctly. Each question has three or four possible answer choices. Test questions come from the South Dakota Commercial Driver License Manual. Questions come from chapters covering: Driving Safely, Air Brakes (if applicable), Combination Vehicles and Doubles and Triples. The Double/Triple endorsement can be used with the Class A CDL.

Number of Question 20

Passing Score 16

1. If there is ice on the front of your side mirror:

You should exit the roadway.

You can expect ice to be on the roadway.

There will not be ice on the roadway.

If your mirrors or wiper blades become icy while you are driving, you can expect the road surface to be icy as well.

2. Why should the steps of a pre-trip inspection be done in the same order each time?

You will be less likely to forget a step.

You will get faster.

It is required by law.

The form must be followed in order.

Doing an inspection the same way every time will help you learn the necessary steps. You will be less likely to forget a step if you get into a routine.

3. When should the trailer hand valve be used?

Only when the trailer is carrying a load

Only to test the trailer’s brakes

Only in inclement weather when the trailer may skid

The trailer hand valve, also called the trolley valve or Johnson bar, is used to work the trailer brakes. It should be used only to test the brakes. Using it while a vehicle is in motion could cause a skid.

4. When near a railroad crossing:

You should expect to hear every approaching train.

You may not hear a train, even if one is approaching.

You will hear two short blasts of a train's horn if a train is approaching.

You should never assume that you will hear an approaching train. The train operator may fail to sound the horn, or the use of a train's horn may be prohibited in a specific area. Even if the train does sound its horn, noise from inside your own vehicle may prevent you from hearing the train until it is dangerously close.

5. When driving a vehicle equipped with an Anti-Lock Braking System (ABS), you should:

Stop harder than you would in a vehicle not equipped with ABS.

Use extra braking force to ensure the ABS kicks in.

Brake as you would in a vehicle not equipped with ABS.

Brake with less force than you would in a vehicle not equipped with ABS.

When driving a tractor-trailer combination that is equipped with an Anti-Lock Braking System (ABS), you should brake in the same manner that you would if the vehicle was not equipped with ABS.

6. When driving in fog, you should:

Use your horn.

Use the low beam lights.

Use the high beam lights.

Use the heater.

If you must drive in fog, you should use your low beam headlights and fog lights to maximize your visibility. Using high beam lights will only make it more difficult for you to see.

7. When inspecting the exhaust system, which of the following should not cause concern?

Loose or broken exhaust pipes

Loose or broken mounting brackets

Leaking exhaust system parts

Exhaust system parts that are not rubbing against fuel system parts

When inspecting a vehicle's exhaust system, be alert to a number of potential problems, including loose, broken, or missing exhaust pipes, mufflers, tailpipes, or vertical stacks; loose, broken, or missing mounting brackets, clamps, bolts, or nuts; exhaust system parts rubbing against fuel system parts, tires, or other moving parts of the vehicle; and exhaust system parts that are leaking.

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