MD CDL COMBINATION TEST - PRACTICE TEST
11.
_________ can make vehicle handling unsafe.
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Poor ventilation
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ABS
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Dry roads
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Poor weight balance
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12.
If your cargo only fills one-third of the length of your trailer, make sure your cargo is:
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piled up high with heavy cargo on top.
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centered and spread out as much as possible.
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to one side and as close to the ground as possible.
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loaded so there is a high center of gravity.
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13.
The service line:
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carries air and is connected to relay valves which allow the trailer brakes to be applied more quickly.
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carries air to the parking brake to control the trailer brakes.
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carries power steering fluid to control the trailer brakes.
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None of the above.
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14.
When coupling a tractor to a semi-trailer, after checking if the fifth-wheel is in proper position for coupling you should:
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make sure the area around the vehicle is clear and the trailer wheels are chocked.
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secure the vehicle.
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connect the air lines to the trailer.
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connect the electrical cord and check the air lines.
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15.
What is the emergency air line for?
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It tells you the amount of brake pressure you need to stop the vehicle.
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It supplies air to the trailer air tanks, and controls the emergency brakes on combination vehicles.
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It controls the front brakes of the tractor in case of an emergency.
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All of the above.
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16.
During your inspection, you should look into the fifth-wheel gap and check that the _________ are fully closed around the kingpin.
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mounting bolts
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couplings (U-joints)
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lug nuts
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locking jaws
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17.
It's very important to distribute the cargo so it is:
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as low as possible.
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piled up.
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as high up as possible.
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in the centre of the load.
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18.
You are coupling a tractor to a semi-trailer and have backed up but are not yet under the trailer. Before backing under the semi-trailer, you should hook up:
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the emergency and service air lines.
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the safety chain.
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the landing gear.
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the electrical service cable.
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19.
What is a pull up when referring to truck driving?
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When a driver stops and pulls forward to get a better position.
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A specific maneuver used to decelerate smoothly in the exit lane.
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Using the speedometer to know when to shift up.
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A driving maneuver used to pull your vehicle over to the side of the road and stop.
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20.
When backing with a trailer, you should:
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look at your line of travel before you begin backing.
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make pull-ups to re-position your vehicle as needed.
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check your mirrors on both sides frequently.
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All of the above.
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