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CDL Combination Practice Test 1 Questions and Answers 2024
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CDL Combination Practice Test 1 Questions and Answers 2024
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CDL Combination Practice Test 1CDL Combination Practice Test
1 Questions and Answers 2024
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
CDL Combination Practice Test 1
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