CDL COMBINATION PRACTICE TEST 1
FROM WWW.CRISTCDL.COM
b When should you use the hand valve to park a combination vehicle? - Never
Which answer is correct for the air valves when testing the trailer service brakes only? - Service Brake:
off; Parking Brake: off; Trailer air supply: in / open; Trolley: applied
You are coupling a semi-trailer to your tractor but have not yet backed under. The trailer is at the right
height when: - The trailer will be raised slightly when the tractor is backed under it
How should you test the tractor trailer connection for security? - Pull gently forward in low gear against
the locked trailer brakes, then inspect the coupling
Which answer is correct for the air valves when testing the trailer spring / parking brakes only? - Service
Brake: off; Parking Brake: off; Trailer air supply: out; Trolley: released
Your emergency air line breaks or gets pulled apart while you are driving. The loss of pressure will cause
the: - Emergency trailer brakes to come on
You supply air to the trailer tanks by: - Pushing in the trailer air supply valve
There are two things that a driver can do to prevent a roll over. They are: (1) keep the cargo as close to
the ground as possible; and (2): - Go slowly around turns
The fifth wheel locking lever is not locked after the jaws close around the kingpin; this means: - The
coupling is not right and should be fixed before driving the coupled unit
When backing your tractor under a trailer, you should expect: - Trailer will be lifted slightly when the
tractor backs under it
Before you start to uncouple, you must - make sure the ground is solid and can support the weight of the
trailer.
During uncoupling, you should disconnect the electrical cable and - hang it with the plug down.
As part of your vehicle inspection test, if your vehicle is equipped with air brakes and has a trailer, you
will inspect the air connections between the truck or tractor and the trailer. Make sure that the
________ are locked in place and free of damage or air leaks. - glad hands
If your vehicle gets stuck on a railroad track, you should - get away from your vehicle and call 911 or the
posted emergency number.
If your test of the tractor protection valve is successful, - the tractor protection valve control (trailer air
supply control) will pop out or go from "normal" to "emergency."
, You should not use the trailer hand brake to straighten out a jackknifing trailer, because - the brakes on
the trailer wheels caused the skid in the first place.
You should not use the trailer hand valve while driving because - of the danger of making the trailer skid.
A trailer is most likely to jackknife when it is - empty.
When backing a tractor under a trailer, you should - always use the lowest reverse gear. When should
you use the hand valve to park a combination vehicle? - Never
Which answer is correct for the air valves when testing the trailer service brakes only? - Service Brake:
off; Parking Brake: off; Trailer air supply: in / open; Trolley: applied
You are coupling a semi-trailer to your tractor but have not yet backed under. The trailer is at the right
height when: - The trailer will be raised slightly when the tractor is backed under it
How should you test the tractor trailer connection for security? - Pull gently forward in low gear against
the locked trailer brakes, then inspect the coupling
Which answer is correct for the air valves when testing the trailer spring / parking brakes only? - Service
Brake: off; Parking Brake: off; Trailer air supply: out; Trolley: released
Your emergency air line breaks or gets pulled apart while you are driving. The loss of pressure will cause
the: - Emergency trailer brakes to come on
You supply air to the trailer tanks by: - Pushing in the trailer air supply valve
There are two things that a driver can do to prevent a roll over. They are: (1) keep the cargo as close to
the ground as possible; and (2): - Go slowly around turns
The fifth wheel locking lever is not locked after the jaws close around the kingpin; this means: - The
coupling is not right and should be fixed before driving the coupled unit
When backing your tractor under a trailer, you should expect: - Trailer will be lifted slightly when the
tractor backs under it
Before you start to uncouple, you must - make sure the ground is solid and can support the weight of the
trailer.
During uncoupling, you should disconnect the electrical cable and - hang it with the plug down.
As part of your vehicle inspection test, if your vehicle is equipped with air brakes and has a trailer, you
will inspect the air connections between the truck or tractor and the trailer. Make sure that the
________ are locked in place and free of damage or air leaks. - glad hands
If your vehicle gets stuck on a railroad track, you should - get away from your vehicle and call 911 or the
posted emergency number.
If your test of the tractor protection valve is successful, - the tractor protection valve control (trailer air
supply control) will pop out or go from "normal" to "emergency."
FROM WWW.CRISTCDL.COM
b When should you use the hand valve to park a combination vehicle? - Never
Which answer is correct for the air valves when testing the trailer service brakes only? - Service Brake:
off; Parking Brake: off; Trailer air supply: in / open; Trolley: applied
You are coupling a semi-trailer to your tractor but have not yet backed under. The trailer is at the right
height when: - The trailer will be raised slightly when the tractor is backed under it
How should you test the tractor trailer connection for security? - Pull gently forward in low gear against
the locked trailer brakes, then inspect the coupling
Which answer is correct for the air valves when testing the trailer spring / parking brakes only? - Service
Brake: off; Parking Brake: off; Trailer air supply: out; Trolley: released
Your emergency air line breaks or gets pulled apart while you are driving. The loss of pressure will cause
the: - Emergency trailer brakes to come on
You supply air to the trailer tanks by: - Pushing in the trailer air supply valve
There are two things that a driver can do to prevent a roll over. They are: (1) keep the cargo as close to
the ground as possible; and (2): - Go slowly around turns
The fifth wheel locking lever is not locked after the jaws close around the kingpin; this means: - The
coupling is not right and should be fixed before driving the coupled unit
When backing your tractor under a trailer, you should expect: - Trailer will be lifted slightly when the
tractor backs under it
Before you start to uncouple, you must - make sure the ground is solid and can support the weight of the
trailer.
During uncoupling, you should disconnect the electrical cable and - hang it with the plug down.
As part of your vehicle inspection test, if your vehicle is equipped with air brakes and has a trailer, you
will inspect the air connections between the truck or tractor and the trailer. Make sure that the
________ are locked in place and free of damage or air leaks. - glad hands
If your vehicle gets stuck on a railroad track, you should - get away from your vehicle and call 911 or the
posted emergency number.
If your test of the tractor protection valve is successful, - the tractor protection valve control (trailer air
supply control) will pop out or go from "normal" to "emergency."
, You should not use the trailer hand brake to straighten out a jackknifing trailer, because - the brakes on
the trailer wheels caused the skid in the first place.
You should not use the trailer hand valve while driving because - of the danger of making the trailer skid.
A trailer is most likely to jackknife when it is - empty.
When backing a tractor under a trailer, you should - always use the lowest reverse gear. When should
you use the hand valve to park a combination vehicle? - Never
Which answer is correct for the air valves when testing the trailer service brakes only? - Service Brake:
off; Parking Brake: off; Trailer air supply: in / open; Trolley: applied
You are coupling a semi-trailer to your tractor but have not yet backed under. The trailer is at the right
height when: - The trailer will be raised slightly when the tractor is backed under it
How should you test the tractor trailer connection for security? - Pull gently forward in low gear against
the locked trailer brakes, then inspect the coupling
Which answer is correct for the air valves when testing the trailer spring / parking brakes only? - Service
Brake: off; Parking Brake: off; Trailer air supply: out; Trolley: released
Your emergency air line breaks or gets pulled apart while you are driving. The loss of pressure will cause
the: - Emergency trailer brakes to come on
You supply air to the trailer tanks by: - Pushing in the trailer air supply valve
There are two things that a driver can do to prevent a roll over. They are: (1) keep the cargo as close to
the ground as possible; and (2): - Go slowly around turns
The fifth wheel locking lever is not locked after the jaws close around the kingpin; this means: - The
coupling is not right and should be fixed before driving the coupled unit
When backing your tractor under a trailer, you should expect: - Trailer will be lifted slightly when the
tractor backs under it
Before you start to uncouple, you must - make sure the ground is solid and can support the weight of the
trailer.
During uncoupling, you should disconnect the electrical cable and - hang it with the plug down.
As part of your vehicle inspection test, if your vehicle is equipped with air brakes and has a trailer, you
will inspect the air connections between the truck or tractor and the trailer. Make sure that the
________ are locked in place and free of damage or air leaks. - glad hands
If your vehicle gets stuck on a railroad track, you should - get away from your vehicle and call 911 or the
posted emergency number.
If your test of the tractor protection valve is successful, - the tractor protection valve control (trailer air
supply control) will pop out or go from "normal" to "emergency."
