CDL DOUBLES PRACTICE TEST MASSACHUSETTS
11.
Most heavy trucks with manual transmissions require ____ to change gears.
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double clutching
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triple clutching
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single clutching
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None of the above.
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12.
When you turn suddenly, which trailer is most likely to turn over?
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The rear trailer of doubles
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The front trailer
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The last trailer of triples
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None of the above.
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13.
The tractor protection valve:
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prevents the trailer from being accidentally released.
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keeps air in the brake system should the trailer develop a bad leak.
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keeps your wheels from locking up when you brake hard.
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keeps air from going out if the air compressor develops a leak.
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14.
When backing a trailer, you should turn the steering wheel to the right to make the trailer go left (or vice versa). Once the trailer starts to turn, you should:
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turn the wheel the other way to follow the trailer.
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turn the wheel more in the direction you want to go.
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keep backing up.
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None of the above.
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15.
To prevent rollover, you should:
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drive slower around corners.
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drive in the left lane whenever possible.
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drive faster on ramps and off ramps.
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All of the above.
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16.
Before driving a vehicle with a dual air system, allow time for the air compressor to build up a minimum of ____ pressure in both the primary and secondary systems.
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75 psi
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100 psi
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50 psi
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25 psi
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17.
Which of the following statements about doubles/triples is true?
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Doubles/triples are more stable than other CMVs.
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A safe speed on a curve for a single trailer combination vehicle may be too fast for a double/triple.
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Doubles/triples may have to go faster around corners than single trailer combination vehicles.
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All of the above.
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18.
Dual tires:
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are dangerous.
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should not come in contact with each other.
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should always come in contact with each other.
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should come in contact with each other whenever possible.
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19.
If the air compressor is belt-driven, you should check the air compressor drive belt before each trip. The belt should be:
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tight.
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cracked.
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loose.
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worn.
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20.
The tractor protection valve:
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works the trailer brakes.
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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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supplies air to the trailer air tanks.
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controls the emergency brakes on combination vehicles.
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