CDL Doubles - Triples Endorsement Practice Test Page 1

01. You should check trailer height before connecting a converter dolly
to a second or third trailer. The trailer height is right when:

a. the trailer will be raised slightly when the converter dolly is backed under it.
b. the center of the kingpin will line up with the locking jaws.
c. the kingpin will be resting on the fifth wheel.
d. the fifth wheel will be touching the trailer.

02. The best way to keep brakes from getting too hot while going down long grades is to:

a. use a high gear so that you will not need to brake.
b. drive fast enough so that the wind keeps them cool.
c. use only the trailer brakes.
d. go slow and use only light, steady pressure on the brakes.

03. With the hand valve on, you should test the trailer brakes by opening
the service line valve at the rear of the rig. When you do this, you should hear:

a. the emergency line valve open and release air.
b. the service brakes slowly move to the fully applied position.
c. air escape from the open valve.
d. nothing there should be no pressure in the line.

04. You are driving a 100 foot truck with double trailers at 30 mph.
The road is dry and visibility is good. You should keep at least ___ seconds
of space ahead of you.

a. 8
b. 9
c. 10
d. 11

05. Which of these will result in the best control on curves?

a. Speed up slightly before the curve, then brake lightly through it.
b. Brake and downshift during the curve.
c. Slow to a safe speed before entering the curve, then coast through the curve.
d. Slow to a safe speed before entering the curve, then accelerate slightly during the curve.

06. When driving a truck with more than one trailer which
trailer should be first behind the tractor?

a. The heaviest.
b. The lightest.
c. The newest.
d. The shortest.

07. You are driving on a slippery road during the day. What does
the Drivers Manual say about how much space you should keep ahead of your truck?

a. Allow "the same amount of space you would at night".
b. Allow "much more space" than is needed for ideal driving conditions.
c. Allow "one vehicle length for every 10,000 lbs of gross vehicle weight"
d. Add "one car length for every 10 mph"