View instructions
Safely pulling double and triple trailers requires knowledge and skill. If you want to pull double or triple trailers, you must add the Doubles/Triples (T) endorsement to your Class A CDL. The Maryland doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The MD CDL doubles triples test covers the following sections of the Maryland CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this MD CDL practice test now to prepare for the actual test!
1. To start moving without rolling back, you should:
apply the trailer brake hand valve.
partly engage the clutch before you take your right foot off the brake.
put on the parking brake whenever necessary.
All of the above.
2. Tire load is defined as:
the minimum tire pressure.
the weight transmitted to the ground by 1 tire.
the minimum safe weight a tire can carry at a specified pressure.
the maximum safe weight a tire can carry at a specified pressure.
3. If during vehicle inspection a tire is too hot to touch, you should:
let air out.
make sure there is enough engine oil on the tires.
immediately decrease air pressure.
remain stopped until the tire cools off.
4. In your mirror, you see a car approaching from the rear. The next time you check your mirror, you don't see the car. If you wish to change lanes, you should:
ease into the other lane slowly so the other car can get out of the way.
assume the car left the roadway and change lanes as normal.
wait until you are sure the car isn't in your blind spot.
None of the above.
5. Emergency equipment is:
only required when transporting hazardous materials.
6. If a load is placed on one side of the trailer:
making turns may be easier.
a rollover is more likely.
the steering axle weight will be too light to steer safely.
your brakes won't work.
7. Engine oil pressure should come up to normal within _________ after the engine is started.
two minutes
five minutes
ten minutes
8. Air storage tanks:
pump air into the air storage tanks.
use parts of the service brake systems to stop the vehicle in a brake system failure.
are installed in the first tank the air compressor pumps air to.
hold compressed air for the brakes.
9. When connecting to the rear trailer, the trailer height should be:
higher than the center of the fifth-wheel.
the same height as the fifth-wheel.
lower than the center of the fifth-wheel.
None of the above.
10. Alcohol:
improves reaction time.
impairs depth perception.
does not affect judgement.
improves muscle coordination.
Page 1 of 2
Next page

Doubles Triples MD CDL Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
Share This Online CDL Test
Rate this Doubles TriplesCDL Test
4.9 out of 5
based on 325 votes