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📖 Combination Test
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41
There are two things that a driver can do to prevent a rollover. They are (1) keep the cargo as close to the ground as possible; and (2):
Make sure that the brakes are properly adjusted.
Keep both hands firmly on the steering wheel.
Go slow around turns. ✓ CORRECT
42
To stop a trailer skid you should:
Use the trailer hand brakes.
Release the service brakes. ✓ CORRECT
Countersteer.
43
If you cannot make a turn without entering another traffic lane:
You dhoulf turn wide when you start the turn
You should turn wide as you complete the turn. ✓ CORRECT
Not to make a turn. Go to another place where you won’t have to cross into another lane.
44
The air lines on a combination vehicles are often colored to prevent then from mixing up. The emergency line is ____, the service line is ____.
Red, blue ✓ CORRECT
Black, yellow.
Blue, red.
45
The semi-trailer made before 1975 that are equipped with the air brakes:
Usually need a glad hand converter.
Often do not have spring brakes. ✓ CORRECT
Have only a service air line.
46
The air leakage rate for a combination vehicle (engine off, brakes on) should be less than ____ psi per minute.
2
3
4 ✓ CORRECT
47
Compared to straight truck or bus there are ____ things to inspect in combination vehicle.
Fewer
The same number.
More ✓ CORRECT
48
When checking the trailer emergency brakes the tractor protection control valve should be placed in what position?
Normal
Emergency ✓ CORRECT
Neutral
49
In normal driving, some drivers use the hand valve before the brake pedal to prevent a jackknife. Which of the statements is true?
It should not be done. ✓ CORRECT
It results in less skidding than using the brake pedal alone.
It is the best way to brake and keep the truck in a straight line.
50
In normal driving, some drivers use the hand valve before the brake pedal to prevent a jackknife. Which of the statements is true?
It should not be done. ✓ CORRECT
It results in less skidding than using the brake pedal alone.
It is the best way to brake and keep the truck in a straight line.