NE CDL DOUBLES TRIPLES TEST - PRACTICE TEST
11.
Before driving a vehicle with a dual air system, the air compressor should build up a minimum of _____ pressure in both the primary and secondary systems.
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100 psi
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50 psi
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10 psi
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75 psi
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12.
If the fifth-wheel locking lever is not locked after the jaws close around the kingpin:
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the coupling is not right and you should not drive until you get it fixed.
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cargo is properly blocked.
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the parking brakes are on and the wheels are chocked.
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the parking brakes are on and your vehicle is safe to drive.
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13.
Too much weight on the steering axle can cause:
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hard steering and damage to the steering axle and tires.
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better handling.
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poor traction.
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None of the above.
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14.
The tractor protection valve:
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works the trailer brakes.
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supplies air to the trailer air tanks.
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keeps air in the tractor brake system should the trailer break away or develop a bad leak.
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controls the emergency brakes on combination vehicles.
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15.
The trailer hand valve should:
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be used in driving.
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never be used to test the trailer brakes.
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never be used for parking.
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All of the above.
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16.
Large vehicles take longer to stop when they are:
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heavily loaded but not fully loaded.
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carrying hazardous materials.
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fully loaded.
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empty.
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17.
ABS:
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helps you increase your average speed.
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improves your visibility at night.
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does not decrease your stopping distance.
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helps you increase your following distance.
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18.
With a dual air brake system:
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each system shares the same lines and hoses.
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each system shares air tanks.
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one system is the main braking system while the other is a back-up system.
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each system has its own air tanks, hoses and lines.
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19.
Empty trucks:
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require shorter stopping distances than fully-loaded trucks.
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have better traction than fully-loaded trucks.
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may have poor traction.
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None of the above.
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20.
When inspecting the coupling, make sure the fifth-wheel jaws have closed around the:
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the brake camshaft.
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head of the kingpin.
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the electrical cord.
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shank of the kingpin.
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