FREE NE CDL Doubles Triples Practice Test (2024)

1. A low air pressure warning signal:

is optional on vehicles with air brakes.
is required on vehicles with air brakes.
is required on all vehicles without air brakes.
None of the above.

2. You are more at risk of being fatigued:

after getting more than 8 hours of sleep.
when driving alone.
when driving during the day.
when stopping periodically during long trips.

3. Doubles and triples:

can be stopped suddenly due to their weight.
can't be turned suddenly.
have a lower chance of skidding.
can be turned suddently due to the low center of gravity.

4. Tire load is defined as:

the maximum safe weight a tire can carry at a specified pressure.
the minimum safe weight a tire can carry at a specified pressure.
the weight transmitted to the ground by 1 tire.
the minimum tire pressure.

5. You can release dolly brakes:

by opening the service line valve.
by closing the air tank petcock.
by opening the air tank petcock.
by closing the emergency line valve.

6. If you have to drive off the road, you should:

keep one set of wheels on the pavement, if possible.
leave the road completely.
brake as hard as you can to maintain control.
fully apply the brakes until your speed has dropped to about 20 mph.

7. Truck tractors with air brakes built after March 1, 1997, are required to be equipped with:

8. When going down a steep downgrade, you should primarily brake using:

the parking brake.
the braking effect of the engine.
the service brakes.
the emergency brake.

9. The service line is also called:

10. If you must drive slowly, how should you alert following drivers?

Flash your brake lights
Turn on your taillights
Help them out by signaling when it is safe to pass
Use your emergency flashers if it is legal

NEBRASKA DOUBLES TRIPLES PRACTICE CDL TEST