CDL COMBINATION PRACTICE TEST (NH)
11.
The service line is also called:
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signal line or air line.
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carrier line or control line.
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pressure line or signal line.
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control line or signal line.
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12.
A truck tractor with _________ requires the shortest stopping distance.
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Weight has no impact on stopping distance.
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a lightly loaded trailer
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an empty trailer
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a fully loaded trailer
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13.
When checking the lights before driving:
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make sure the parking brake is not set.
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you should check them from inside the vehicle.
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you should turn off the engine.
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the engine must be running.
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14.
If your trailer starts to skid, you should:
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keep the rear of your vehicle close to the curb.
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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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15.
If your truck catches fire, the first thing you should do is to:
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get off the vehicle, open the hood and start shooting foam to keep the engine cool.
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pull into a service station and call for help.
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pull off the road and park in an open area.
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get the vehicle off the road and park near other vehicles.
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16.
When should you use the hand valve to park a combination vehicle?
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When parking downhill.
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Never.
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To park at loading docks.
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Always.
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17.
A bridge formula permits:
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more maximum axle weight for axles that are closer together.
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more maximum axle weight for axles that are far apart.
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less maximum axle weight for axles that are close together.
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less maximum axle weight for axles that are far apart.
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18.
Hydroplaning:
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only occurs at extremely high speeds.
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only happens when tire pressure is higher than normal.
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never occurs at speeds below 40 mph.
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can occur at speeds as low as 30 mph.
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19.
Converter dollies and trailers built before 1975:
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are not required to have spring brakes.
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are required to have spring brakes.
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typically have 2 parking brakes.
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are required to have ABS.
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20.
At speeds below 40 mph, you should leave at least one second in front of you for each ___ feet of vehicle length.
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5
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20
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30
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10
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