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Bobtailing And Jackknifing – SS13022AE (8 min.)

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1

Bobtailing is dangerous because of the profile of the tractor.

True
False

2

It is okay to bobtail with marginal safety defects on the tractor unit.

True
False

3

You should only travel in good weather. Pull off and wait out the inclement weather.

True
False

4

Jackknifing occurs when the driver locks up the drive axle brakes on the tractor.

True
False

5

If you lock up the steering axle brakes, the rig will move backward regardless of the wheel angle.

True
False

6

There are many reasons for bobtailing a tractor, such as _____________.

Receipt of a new tractor unit
Bring the tractor back to the hub after a short haul
Training
All of the above

7

You should only bobtail when ________________.

There is good weather
Absolutely necessary
Equipment is in tip top shape
All of the above

8

Jackknifing will occur if you ________________.

Lock up the drivers
Lock the steering axle brakes
Trailer swings
Maximum braking

9

If you can keep the axles from locking up, even ______ % short of locked up, you can preserve directional stability

2
3
4
5

10

Steering axle brakes provides _______ % of the total braking capability of a loaded vehicle.

10
12
14
16