Combination

Question 1

the “crack-the-whip” effect can

Answer 1

turn over a trailer

Question 2

to help prevent rollovers you should

Answer 2

drive slowly around turns

Question 3

large combination vehicles take the longest amount of time to stop

Answer 3

when empty

Question 4

what is off tracking

Answer 4

when a vehicle’s front wheels follow a different path then it’s real wheels.

Question 5

when backing a trailer how should you turn the steering wheel

Answer 5

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

Question 6

what does the trailer air supply control look like.

Answer 6

it is an eight-sided red knob.

Question 7

air pressure in the ____ airline is controlled by either the foot brake or trailer handbrake

Answer 7

service

Question 8

one function of the emergency airline is to

Answer 8

control the emergency air brakes.

Question 9

having ABS on only one axle

Answer 9

will allow the driver additional control over there vehicle while braking

Question 10

if a trailer begins to skid the driver should

Answer 10

release the brakes.

Question 11

the trailer hand valve should

Answer 11

be used only to test the trailer brakes.

Question 12

all trailers made after ____ must be equipped with anti-lock braking systems

Answer 12

1998

Question 13

when a combination vehicle goes around a corner

Answer 13

the front and rear wheels move in different paths.

Question 14

if a parked trailer does not have spring breaks you should keep the trailer from moving by

Answer 14

using wheel chocks

Question 15

trailers with low underneath clearance may be difficult to drive

Answer 15

over railroad crossings.

Question 16

a shut-off valve

Answer 16

prevents air from escaping an air brake system.

Question 17

if the trailer is too high

Answer 17

they may not couple correctly

Question 18

after coupling there should be ____ between the upper and the lower fifth wheel

Answer 18

no space

Question 19

when uncoupling a trailer landing gear should be

Answer 19

firmly on the ground.

Question 20

before I drive ensure that air flows to all trailers by

Answer 20

opening the rear shut-off valve and listening for escaping air

Question 21

test the tractor protection valve for by

Answer 21

releasing air with the brake pedal

Question 22

pull out the trailer Air supply control to test

Answer 22

the trailer emergency brakes

Question 23

to prevent a rollover a driver should

Answer 23

keep cargo low.

Question 24

one way to prevent a rollover is

Answer 24

keep cargo centered on the rig.

Question 25

in a sudden turn the ____ trailer is the most likely to turn over

Answer 25

last

Question 26

using a trailer handbrake while experiencing a trailer jack knife will

Answer 26

continue the skid

Question 27

if you need to back your trailer but cannot back up in a straight path you should

Answer 27

back toward the driver’s side

Question 28

using the trailer hand valve while driving

Answer 28

can cause a skin

Question 29

push in the trailer air supply control to

Answer 29

supply the trailer with air.

Question 30

in a vehicle equipped with an automatic tractor protection valve the valve will pop out when.

Answer 30

air pressure drops to a level between 20 and 45 psi

Question 31

an air supply control and it’s “emergency” position well.

Answer 31

apply the trailer emergency brakes

Question 32

the service airline is attached to the

Answer 32

relay valves

Question 33

the emergency air line

Answer 33

supplies air to the trailer air tanks.

Question 34

trailers built before 1975 are

Answer 34

are not required to have spring breaks.

Question 35

while inspecting a coupling you should go under the trailer and

Answer 35

look into the back of the fifth wheel.

Question 36

if you are operating a vehicle built before 1998 and are unsure if the trailer has an anti-lock braking system (ABS) you can

Answer 36

check the wheel speed sensors coming from the back of the brakes.

Question 37

after finishing a pre-trip inspection you should

Answer 37

close the emergency line valve.

Question 38

after finishing a pre-trip inspection you should

Answer 38

close the service line valve.

Question 39

during a trip which shut off valves should be open?

Answer 39

all shut-off valves should be in an open position except the rear shut-off valves.

Question 40

to test the trailer service brakes you should

Answer 40

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

Question 41

____ are the calls for more than half of all accidents related truck driver deaths

Answer 41

truck rollover

Question 42

when traveling more slowly than 40 mph maintain at least _____ of following distance per every 10 ft of your vehicle.

Answer 42

one second

Question 43

avoid needing to make sudden Lane changes by

Answer 43

watching the road ahead of you while driving

Question 44

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

Answer 44

the stiff suspension springs and strong brakes will have low traction

Question 45

when driving a bobtail tractor you should be aware that

Answer 45

Bobtells a more difficult to stop than tractors with semitrailers

Question 46

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

Answer 46

need more space to turn and stop.

Question 47

when entering or crossing traffic while driving a combination vehicle it is especially important that you

Answer 47

make sure there is a large enough Gap for your vehicle.

Question 48

and air supply control liver should be in its normal position when you are

Answer 48

pulling a trailer

Question 49

when glad hands are coupled the seal should be pressed together at an angle of

Answer 49

90 degrees

Question 50

in a double or triple combination

Answer 50

the heaviest trailer should be positioned directly behind the cab.