CDL DOUBLES TRIPLES PRACTICE TEST CONNECTICUT
11.
To know how much space you should keep in front of you when driving at speeds below 40 mph, one good rule says you need at least ______ for each ______ of vehicle length.
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3 seconds; 50 feet
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1 second; 10 feet
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2 seconds; 10 feet
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1 second; 5 feet
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12.
The posted speed limit for a curve:
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is optional and may be exceeded.
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may be too fast for many trucks or buses.
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is safe for all vehicles.
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is safe for trucks or buses, but it may be too fast for cars.
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13.
The trolley valve should be used only:
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to prevent skids.
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to test the trailer brakes.
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in an emergency.
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in driving.
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14.
When parking a trailer without spring brakes, it is very important for safety that you use wheel chocks. Why?
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if you don't use wheel chocks, supply air will be sent to the service line instead of going to charge the trailer air tanks.
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You may not notice a major leak in the service line until you try to put the brakes on.
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The air could leak out of the trailer air tank, releasing its emergency brakes.
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None of the above.
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15.
Doubles and triples are:
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more stable than straight trucks.
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more likely to turn over than other combination vehicles because of the "crack-the-whip" effect.
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less likely to turn over than other combination vehicles.
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easier to drive than other combination vehicles.
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16.
To prevent rollover, you should:
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keep the cargo as close to the ground as possible.
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drive slowly around on ramps and off ramps.
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go slowly around turns.
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All of the above.
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17.
The trailer hand valve should be used:
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to check that the fire extinguisher is charged.
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to check that the trailer is locked onto the tractor.
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to check that the trailer emergency brakes are on.
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to test the trailer brakes.
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18.
The trailer hand valve should:
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never be used to test the trailer brakes.
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be used in driving.
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never be used for parking.
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All of the above.
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19.
Too much weight on the steering axle can cause:
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better handling.
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poor traction.
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hard steering and damage to the steering axle and tires.
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None of the above.
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20.
When checking the lights before driving:
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the engine must be running.
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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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make sure the parking brake is not set.
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