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 New Hampshire doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The NH CDL doubles triples test covers the following sections of the New Hampshire CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this NH CDL practice test now to prepare for the actual test!
1. Which of the following is a common cause of truck fires?
loose fuel connections.
Short circuits due to loose connections.
Under-inflated tires and duals that touch.
All of the above.
2. Placards are:
a type of safety equipment.
signs placed on a vehicle to identify the hazard class of the cargo.
devices placed below a vehicle to improve traction.
signs put inside a vehicle used to warn others of hazardous materials.
3. To use the controlled braking method in an emergency, you should:
apply the brakes as hard as you can without locking the wheels.
apply your brakes all the way, and release the brakes when the wheels lock up.
apply the brakes when the wheels lock up.
pump the brake pedal 3 times.
4. What is the minimum tread depth for tires other than front tires?
4/16 inch
8/32 inch
4/32 inch
2/32 inch
5. Dual tires:
are dangerous.
should always come in contact with each other.
should come in contact with each other whenever possible.
should not come in contact with each other.
6. Watch out for black ice:
when the temperature is above freezing and the road is dry.
right after it starts to rain.
any time the temperature is below freezing and the road looks wet.
when it is snowing.
7. Because of the "crack-the-whip" effect, doubles and triples:
are more likely to turn over than other combination vehicles.
can go much faster than other combination vehicles.
are much slower than other combination vehicles.
are more likely to run out of gas than other combination vehicles.
8. If your ABS malfunctions:
the parking brakes will not work.
you still have normal brake functions.
you should immediately come to a complete stop.
the service brake will not work.
9. If an aggressive driver is involved in an accident down the road, you should:
try to get their vehicle to the side of the road.
make eye contact with the driver.
confront the aggressive driver.
stop a safe distance from the accident scene, wait for the police and report the behavior you witnessed.
10. When driving in extremely hot weather, if the air pressure in the tires is too high, you should:
let air out of the tires to decrease pressure.
stop and remain stopped until the tires cool off.
call your supervisor.
continue driving.
Page 1 of 2
Next page

NH Doubles Triples CDL Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
Share This Online CDL Test
Rate this Doubles Triples CDL Test
4.7 out of 5
based on 157 votes