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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Maryland CDL combination test consists of 20 questions, and you'll need at least 16 correct answers to pass (80%). The test covers the combination vehicles section of the Maryland CDL Manual. Take this practice test now to prepare for the actual MD CDL combination test!
1.
When parking, you should choose a spot:
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that requires backing up.
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that allows you to pull forward when you leave.
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that allows you do a walk around inspection.
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All of the above.
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2.
If you try to couple when the trailer is too low:
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the tractor could roll away.
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the tractor may strike and damage the trailer nose.
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it might not couple correctly.
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All of the above.
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3.
During a walk around inspection of a combination vehicle, drivers should check that:
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all locking pins are present and locked in place.
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the locking jaws are around the shank.
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the glide plate is securely mounted to the trailer frame.
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All of the above.
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4.
If your trailer starts to skid, you should:
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accelerate slightly.
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use the trailer hand brake (if you have one) to straighten out the rig.
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release the brakes to get traction back.
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keep the rear of your vehicle close to the curb.
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5.
You are coupling a tractor to a semi-trailer. After checking the trailer height but before supplying air to the trailer, you should:
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raise the front trailer supports.
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inspect the fifth-wheel.
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lock the trailer brakes.
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connect the air lines to the trailer.
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6.
You should test the coupling by:
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applying the parking brakes so the rig will not move.
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disconnect the safety chains.
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pulling against the pin of the second semitrailer.
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locking the pintle hook.
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7.
ABS helps you:
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steer gently and smoothly while you are braking.
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increase your normal braking capability.
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avoid wheel lock up and maintain control of your vehicle when you brake.
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stop much faster.
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8.
Which of the following makes a rollover more likely?
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Keeping the load centered on your rig
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Driving quickly around turns
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Keeping the cargo as close to the ground as possible
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Driving slowly around turns
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9.
When checking the air and electric lines to the trailer, be sure that the air lines are properly connected to the gland hands, and are:
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properly greased.
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secured with enough slack for turns.
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secured with enough air leaks for turns.
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None of the above.
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10.
If you have a manual transmission, when stopping don't _______ until the engine rpm is down close to idle.
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place the transmission in park
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push the clutch in
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shift to second gear
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apply the brakes
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