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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 you are uncoupling a loaded trailer, lower the landing gear until:
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the tractor frame is under the trailer.
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the pressure in the system is above 55 psi.
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it makes firm contact with the ground.
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makes contact with the ground, and leave the trailer off the fifth wheel.
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2.
When driving at night you should:
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keep the interior light on.
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use your high beams when it is safe and legal to do so.
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always use low beams.
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All of the above.
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3.
Passive railroad crossings:
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have at least one traffic control device.
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should never be crossed using a CMV.
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usually have a person directing traffic.
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do not have traffic control devices.
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4.
If your vehicle has dummy couplers, why should you use them when the air lines are not connected to a trailer?
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Because if you don't, you will never build system pressure.
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To prevent freezing of the washer liquid.
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To prevent overheating.
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To prevent water and dirt from getting into the coupler and the air lines.
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5.
You are driving a heavy vehicle with a manual transmission, and you have to stop on the shoulder while driving on an uphill grade. When putting your vehicle back in motion up the grade, you should:
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keep the clutch slipping while slowly accelerating.
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use the parking brake to hold the vehicle until the clutch engages.
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shift down to a speed that you can control without using the brakes.
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partly engage the clutch before you take your right foot off the brake.
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6.
Before starting down a hill, you should:
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look for an escape route.
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release the accelerator and shift to Neutral at the same time.
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apply the brakes hard.
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slow down and shift to a lower gear.
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7.
Strong winds can make it difficult to stay in your lane, especially when:
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going into tunnels.
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driving alongside other vehicles.
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driving at speeds below 40 mph.
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coming out of tunnels.
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8.
One way to prevent hydroplaning is to:
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take curves at higher speeds.
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use the controlled braking method.
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make sure you have enough tread on your tires.
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have less than 4/32 inch tread depth in every major groove on front tires.
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9.
Fully loaded rigs:
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are just as likely to roll over as empty rigs.
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are less likely to roll over than empty rigs.
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are much more likely to roll over than empty rigs.
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None of the above.
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10.
When backing, as soon as you see the trailer getting off the proper path, you should:
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turn the top of the steering wheel in the opposite direction of the drift.
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to keep a firm grip on the steering wheel and continue backing.
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turn the top of the steering wheel in the direction of the drift.
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None of the above.
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