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CDL Test > Combination > Flashcards

Combination Flashcards

1
Q

when backing a tractor under a trailer, you should

A

always use the lowest reverse gear

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2
Q

after the trailer has been coupled to the tractor, the tractor protection control valve should be placed in what position

A

Normal

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3
Q

the fifth wheel locking lever is not locked after the jaws closed around the kingpin. this means that

A

the coupling is not right and should be fixed before driving the coupled unit

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4
Q

off tracking or cheating causes which of these to follow the wider pass while making a turn

A

tractor towing a 45 foot trailer

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5
Q

the air lines on a combination vehicle are often colored to prevent them from being mixed up. the emergency line is BLANK; the service line is BLANK

A

Red and Blue

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6
Q

the semitrailers made before 1975 that are equipped with air brakes

A

often do not have spring brakes

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7
Q

the air leakage rate for combination vehicle (Engine off, brakes on) should be less than BLANK psi per minute

A

4

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8
Q

compared to a straight truck or bus, there are BLANK things to inspect in a combination vehicle

A

More

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9
Q

you have a major leak in the service line and you put on the brakes, the service air will escape and cause

A

the trailer emergency brakes to come on

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10
Q

a tractor with a BLANK trailer requires the shortest amount of stopping distance

A

fully loaded

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11
Q

when you get ready to back under a semitrailer, you should line up

A

directly infront of the trailer

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12
Q

to unlock the fifth wheel the locking lever should be place in the BLANK position

A

open

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12
Q

the tractor protection valve will close and the trailer emergency brakes will come on when there is a major leak in the BLANK brake line

A

Emergency

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13
Q
A
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14
Q

when coupling, the proper position of the fifth wheel is

A

tilted down towards the end of the trailer

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15
Q

what gear should be the tractor engine be in after you uncouple the trailer and are inspecting the trailer supports?

A

Neutral

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16
Q

you have coupled with a semi trailer. where should you put the iron trailer supports before driving away

A

fully raised with the crank handle secured in its bracket

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17
Q

the safetyy catch for the fifth wheel locking lever must be BLANK for the coupling to be complete

A

over the locking lever

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18
Q

after you supply to the trailer, make sure the air lines are not crossed and the trailer brakes are working. this is done by

A

applying and releasing the trailer and listening the sound of the brake

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19
Q

before you back under a trailer, make sure that

A

the trailer brakes are locked

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20
Q

when you uncoupling a loaded trailer, you should lower the landing gear until it

A

makes firm contact with the ground, then crackle hit a lower gear a few extra turns

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21
Q

what will happen if the air lines are closed when you hook up to an old trailer?

A

if the trailer has no spring brakes, you could drive away, but you wouldnt have trailer brakes

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22
Q

there are two things a driver can do to prevent a roll over. (1) keep the cargo as close to the ground as possible, and (2)

A

go slow around turns

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23
Q

to stop a trailer skid, you should

A

release the service brakes

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24
Q

why should you be sure that the fifth wheel plate is greased as required?

A

to prevent steering problems

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25
Q

you emergency air line breaks or get pulled apart while you are driving. the loss of pressure will cause

A

emergency trailer brakes to come on

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26
Q

when connecting the glad hands, press the two seals with the coupler together at what degree to each other

A

90 degrees

27
Q

which of these statements is true?

A

bobtail tractor can take longer to stop than a combination vehicle loaded to maximum gross weight

28
Q

a tractor with BLANK trailer, requires the shortes amount of stopping distance

A

fully loaded

29
Q

after you have coupled the trailer, you should raise the landing gear by using

A

low gear

30
Q

you supply air to the trailer tanks by

A

pushing in the trailer air supply valve

31
Q

which part of the kingpin should the locking jaws close around

A

the shank

32
Q

how much space should be allowed between upper and lower fifth wheel after coupling

A

Nothing

33
Q

you have pushed the trailer air supply valve. you should not back a tractor under a trailer until the whole air system is

A

at normal pressure

34
Q

you are coupling a tractor to a semitrailer. you have connected the air lines. before backing under the trailer, you should

A

supply air to the trailer system, then pull out the air supply knob

35
Q

the air brake leakage rate for a combination vehicle (engine off, brakes off) should be less than BLANK psi per minute

A

3

36
Q

the safest way to make a turn without entering another traffic lane is

A

you should turn wide as you complete your turn

37
Q

the higher the center of gravity of your truck, the

A

easier to turn over

38
Q

a driver crosses the air lines when hooking up to an old trailer, what will happen?

A

if the trailer has no spring brakes, you could drive away, but you wouldnt have trailer brakes

39
Q

the hand valed should be used

A

to test the trailer brakes

40
Q

when driving a set of doubles, it is necessary to close which shut off valve in the last trailer

A

Back

41
Q

if the service line comes apart while you are driving a combination vehicle, but the emergency line stays together, what will happen right away?

A

nothing is likely to happen until you try to apply the brakes

42
Q

after connecting the air lines, but before backing under the trailer, you should

A

supply air to the trailer system, then pull out the air supply knob

43
Q

you are coupling a tractor to a semitrailer and have back up, but are not under it, what should you hook up before backing under?

A

the emergency and service air lines

44
Q

why should you lock the tractor glad hands to each other (or dummy couplers), when you are not towing a trailer?

A

it will keep dirt or water out of the lines

45
Q

while driving behind another vehicle under good conditions, you should allow at least one second between you vehicle and the vehicle ahead for each BLANK(how many) feet of your vehicle length

A

10

46
Q

if the service lines come apart while you are driving a combination vehicle, but the emergency lines stay together, what will happen right away?

A

nothing is likely to happen until you apply the brakes

47
Q

glad hands are usually connecting which of these

A

Service and emergency air lines from the vehicle to the trailer

48
Q

you are about to back your tractor under a semitrailer. the trailer is at the right height when the

A

the trailer will be lifted slightly when the tractor backs under it

49
Q

while checking if the tractor is securely coupled to the trailer, the landing gears should be

A

slightly raised

50
Q

air and electrical lines from the tractor to the trailer should be

A

secured but with enough loop to turn

51
Q

you should not back a tractor under a trailer until the whole air system is

A

at normal pressure

52
Q

after you lock the kingpin into the fifth wheel, you should check the connection by

A

pulling the tractor ahead gently with the trailer brakes locked

53
Q

where should the tractor be when you inspect landing gear after uncoupling the trailer?

A

with the tractor frame under the trailer

54
Q

your emergency air line breaks or gets pulled apart while you are driving. the loss of pressure will cause

A

emergency trailer brakes to come on

55
Q

the front trailer supports are up and the trailer is resting on the tractor. make sure

A

there is enought clearance between the top of the tractor tires, the nose of the trailer, tractor frame and landing gear

56
Q

when uncoupling the trailer, after you shut off the trailer air supply and lock the trailer brakes you should

A

back up gently to ease pressure on the fifth wheel

57
Q

air brake equipped trailer made before 1975

A

often do not have spring brakes

58
Q

the iron trailer supports are up and the trailer is resting on the tractor. make sure

A

there is enough clearance between the tractor frame and landing gear

59
Q

if you cannot make a turn without entering another traffic lane

A

you should turn wide as you complete turn

60
Q

when checking the trialer emergency brakes, the trator protection control valve should be placed in what position?

A

Emergency

61
Q

you are driving a combination vehicle when the trailer breaks away, pulling apart both the air lines, you expect the trailer brakes to come on

A

the tractor protection valve to close

62
Q

in normal driving, some drivers use the hand valves before the brake pedal to prevent a jackknife, which of these statements is true

A

it should not be done

63
Q

when should you use the hand valve to park a combination vehicle

A

never

64
Q

if the brakes are not released when you push the trailer air supply valves, you should

A

check the air line connection

65
Q
A

CDL Test (3 decks)

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