A trailer at the end of a combination.

Not necessary on doubles or triples.

Is a major cause of fatal crashes.

Can be a good way to get to your destination quickly.

Should only be done if the roadway is dry.

Is acceptable in light traffic.

Can help drivers see a larger area.

Cannot be used on vehicles transporting hazardous materials.

Delaware CDL Double 2 - DMV Written Test Questions with Answers

Q.1

If you don't pull the dolly out from beneath the rear trailer before unlocking the pintle hook:

The tow bar may cause injury.
The landing gear may break.
The pintle hook may detach.
Nothing bad could happen.

Q.2

To ensure that you do not slow down traffic when driving a large truck, you should:

Switch gears while driving uphill.
Try to pass another vehicle while driving uphill.
Stay in the right lane whenever possible.

Q.3

When driving through fog, a driver should:

Use high beam headlights.
Use low beam headlights.
Run the windshield wipers.
Drive on the shoulder.

Q.4

When driving, it is important that you:

Develop plans to get out of potentially dangerous situations.
Enjoy the scenery.
Turn your head all the way around rather than use mirrors.

Q.5

Hydraulic brakes can fail for one of two reasons. Which of the following is one of those reasons?

There is a loss of hydraulic pressure.
You are driving uphill.
The brakes get too cold.
The brakes are used too much in one day.

Q.6

Maintaining a cushion of space between your vehicle and the vehicle ahead is:

Not encouraged, as it slows the flow of traffic.
Encouraged, as it allows you time to react to unexpected hazards.
Only encouraged if you are traveling with a passenger.

Q.7

Rollovers happen when drivers:

Turn too quickly.
Do not driving fast enough.
Pay attention to the road.
Drive illegally.

Q.8

While operating on a downgrade, you should brake until you reach a speed that is:

5 mph below your safe speed.
10 mph below your safe speed.
15 mph below your safe speed.

Q.9

When driving in winter, which of the following should receive extra attention in a pre-trip inspection?

Coolant and antifreeze levels
The air conditioning unit
The oil pressure

Q.10

Anti-Lock Braking Systems (ABS):

Reduce normal braking capacity.
Are equipped in addition to other braking systems and do not reduce normal braking power.
Are not effective on larger vehicles.
Are illegal in some states.

Q.11

If a trailer is not at the proper height during coupling:

It will not make a difference when coupling.
Coupling will be more secure.
It may not couple correctly.
Coupling will be easier.

Q.12

A converter gear is:

A lock on a trailer door.
A coupling device.
A trailer at the end of a combination.
Not necessary on doubles or triples.

Q.13

Driving too fast:

Is a major cause of fatal crashes.
Can be a good way to get to your destination quickly.
Should only be done if the roadway is dry.
Is acceptable in light traffic.

Q.14

Convex mirrors:

Cannot be used on vehicles transporting hazardous materials.
Are illegal in most states.
Can help drivers see a larger area.

Q.15

An air compressor governor controls:

When the air compressor pumps air into the air storage tanks.
How fast air is pumped into the air storage tanks.
The temperature of the air pumped into the air storage tanks.

Q.16

The two indicators that determine when you should upshift are:

Engine speed and road speed.
Other trucks and road conditions.
Timing and road position.
Oil pressure and air brake pressure.

Q.17

A driver should use the trailer hand valve to:

Uncouple the trailers.
Test the trailer brakes.
Apply the emergency brakes.

Q.18

After starting the engine, oil pressure should reach a normal level:

Within a few seconds.
After about a minute.
After about four minutes.
Within 10 minutes of driving.

Q.19

If your brakes fail on a downgrade, your best hope to stop is to:

Use an escape ramp.
Use the shoulder.
Drift to a stop.

Q.20

The trailer hand valve should not be used while you are driving because:

It will disconnect from the vehicle.
You will stop the vehicle too quickly.
It can cause a skid.