CDL COMBINATION PRACTICE TEST (SD)
11.
You have two tie-downs on a 15 foot load. How many more tie-downs do you need to secure cargo and keep it from shifting or falling?
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Three
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One
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None
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Two
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12.
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 slowly around turns
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Keeping the cargo as close to the ground as possible
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Driving quickly around turns
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13.
The emergency air line does NOT:
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pump air into the relay valves, allowing the trailer brakes to be applied more quickly.
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control the emergency brakes on combination vehicles.
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supply air to the trailer air tanks.
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cause the tractor protection valve to close when the emergency line loses pressure.
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14.
When you make a quick lane change, the crack-the-whip effect can turn the trailer over. The crack-the-whip effect is caused by:
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rearward amplification.
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worn tire tread.
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the rear trailer of a triple.
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strong wind.
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15.
Who is responsible for inspecting the cargo?
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The motor carrier
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The person who loaded and secured the cargo
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The shipper
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The driver
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16.
If an aggressive driver is involved in an accident down the road, you should:
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try to get their vehicle to the side of the road.
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stop a safe distance from the accident scene, wait for the police and report the behavior you witnessed.
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make eye contact with the driver.
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confront the aggressive driver.
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17.
When you back under a trailer:
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back the tractor slowly.
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make sure the trailer brakes are locked.
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use lowest reverse gear.
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All of the above.
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18.
After starting the engine, oil pressure should rise to a normal level:
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within seconds.
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within 3 miles.
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within 6 minutes.
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within 2 minutes.
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19.
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 electrical cord and check the air lines.
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connect the air lines to the trailer.
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20.
Brake fade results from, and is affected by:
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brakes out of adjustment.
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excessive heat caused by not relying on the engine braking effect.
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excessive heat caused by using the brakes too much.
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All of the above.
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