Combination Flashcards

1
Q

The “crack-the-whip” effect can:

A

Turn over a trailer.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

To help prevent rollovers, you should:

A

Drive slowly around turns.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Large combination vehicles take the longest amount of time to stop:

A

When empty.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is off-tracking?

A

When a vehicle’s front wheels follow a different path than its rear wheels

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

When backing a trailer, how should you turn the steering wheel?

A

Turn the top of the steering wheel in the direction opposite of where you want the trailer
to go.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What does the trailer air supply control look like?

A

It is an eight-sided red knob.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Air pressure in the ____ air line is controlled by either the foot brake or trailer hand brake.

A

Service

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

One function of the emergency air line is to:

A

Control the emergency brakes.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Having ABS on only one axle:

A

Will allow the driver additional control over their vehicle when braking.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

If a trailer begins to skid, the driver should:

A

Release the brakes.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

The trailer hand valve should:

A

Be used only to test the trailer brakes.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

All trailers made after ____ must be equipped with Anti-Lock Braking Systems (ABS).

A

1998

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

When a combination vehicle goes around a corner:

A

The front and rear wheels move in different paths.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

If a parked trailer does not have spring brakes, you should keep the trailer from moving by:

A

Using wheel chocks.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Trailers with low underneath clearance may be difficult to drive:

A

Over railroad crossings.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

A shut-off valve:

A

Prevents air from escaping an air brake system.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

If a trailer is too high:

A

It may not couple correctly.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

After coupling, there should be ____ between the upper and lower fifth wheel.

A

No space

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

When uncoupling a trailer, landing gear should be:

A

Firmly on the ground.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Before a drive, ensure that air flows to all trailers by:

A

Opening the rear shut-off valves and listening for escaping air.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Test the tractor protection valve by:

A

Releasing air with the brake pedal.

22
Q

Pull out the trailer air supply control to test:

A

The trailer emergency brakes.

23
Q

To prevent a rollover, a driver should:

A

Keep cargo low.

24
Q

One way to prevent a rollover is to:

A

Keep cargo centered on the rig.

25
Q

In a sudden turn, the ____ trailer is the most likely to turn over.

A

Last

26
Q

Using the trailer hand brake while experiencing a trailer jackknife will:

A

Continue the skid.

27
Q

If you need to back your trailer but cannot back up in a straight path, you should:

A

Back toward the driver’s side.

28
Q

Using the trailer hand valve while driving:

A

Can cause a skid.

29
Q

Push in the trailer air supply control to:

A

Supply the trailer with air.

30
Q

In a vehicle equipped with an automatic tractor protection valve, the valve will pop out when:

A

Air pressure drops to a level between 20 and 45 psi.

31
Q

An air supply control in its “emergency” position will:

A

Apply the trailer emergency brakes.

32
Q

The service air line is attached to the:

A

Relay valves.

33
Q

The emergency air line:

A

Supplies air to the trailer air tanks.

34
Q

Trailers built before 1975 are:

A

Not required to have spring brakes.

35
Q

While inspecting a coupling, you should go under the trailer and:

A

Look into the back of the fifth wheel.

36
Q
If you are operating a vehicle built before 1998 and are unsure if the trailer has an Anti-Lock
Braking System (ABS), you can:
A

Check for wheel speed sensors coming from the back of the brakes.

37
Q

After finishing a pre-trip inspection, you should:

A

Close the emergency line valve.

38
Q

After finishing a pre-trip inspection, you should:

A

Close the service line valve.

39
Q

During a trip, which shut-off valves should be open?

A

All shut-off valves should be in the open position, except the rear shut-off valves.

40
Q

To test the trailer service brakes, you should:

A

Move the vehicle forward slowly and apply the brakes with the hand control.

41
Q

____ are the cause of more than half of all accident-related truck driver deaths.

A

Truck rollovers

42
Q

When traveling more slowly than 40 mph, maintain at least ____ of following distance per
every 10 feet of your vehicle.

A

One second

43
Q

Avoid needing to make sudden lane changes by:

A

Watching the road ahead while driving.

44
Q

A lightly-loaded combination vehicle will stop more slowly than a fully-loaded vehicle because:

A

The stiff suspension springs and strong brakes will have low traction.

45
Q

When driving a bobtail tractor, you should be aware that:

A

Bobtails are more difficult to stop than tractors with semitrailers.

46
Q

Compared to other commercial motor vehicles, combination vehicles need more space on the
road because they are longer and they:

A

Need more space to turn and stop.

47
Q

When entering or crossing traffic while driving a combination vehicle, it is especially important
that you:

A

Make sure there is a large enough gap for your vehicle.

48
Q

An air supply control lever should be in its “normal” position when you are:

A

Pulling a trailer.

49
Q

When glad hands are coupled, the seals should be pressed together at an angle of:

A

90 degrees.

50
Q

In a double or triple combination:

A

The heaviest trailer should be positioned directly behind the cab.