CDL DOUBLES PRACTICE TEST NEW MEXICO
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Safely pulling double and triple trailers requires knowledge and skill. If you want to pull double or triple trailers, you must add the Doubles/Triples (T) endorsement to your Class A CDL. The New Mexico doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The NM CDL doubles triples test covers the following sections of the New Mexico CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this NM CDL practice test now to prepare for the actual test!
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1.
When inspecting the coupling, make sure the fifth-wheel jaws have closed around the:
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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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2.
Which of the following vehicles is most likely to turn over?
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65 ft. conventional double
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3 axle tractor semitrailer
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Triple trailer
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3.
If you cannot make a right turn without entering another traffic lane, you should:
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turn wide as you complete the turn.
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swing wide to the left before starting the turn.
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turn wide before you start the turn.
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4.
Headache racks:
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can blind other drivers.
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protect you from being hit by your cargo.
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help you keep weights within legal limits.
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5.
Engine oil pressure should come up to normal within _________ after the engine is started.
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seconds
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two minutes
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five minutes
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6.
Alcohol:
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improves reaction time.
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does not affect judgement.
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impairs depth perception.
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7.
When driving a 60-foot truck at 50 mph, your minimum following distance should be:
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5 seconds
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7 seconds
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6 seconds
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8.
In vehicles with air brakes, the air compressor governor:
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controls when the air storage tanks will pump air into the air compressor.
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controls when the air compressor will pump air into the air storage tanks.
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controls how much air the air compressor will pump into the air storage tanks.
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9.
Most heavy-duty vehicles use:
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air brakes.
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hydraulic brakes.
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solid brakes.
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10.
The trailer hand valve should be used:
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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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NM CDL Doubles Triples Test
| Number of questions: | 20 |
| Correct answers to pass: | 16 |
| Passing score: | 80% |
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