SOUTH DAKOTA CDL DOUBLES TRIPLES PRACTICE TEST
11.
Dollies with ABS are required to have a malfunction lamp:
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on the left side.
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on the front.
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on the right side.
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on the rear.
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12.
In vehicles with air brakes, the air compressor governor:
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controls how much air the air compressor will pump into the air storage tanks.
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controls when the air compressor will pump air into the air storage tanks.
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controls when the air storage tanks will pump air into the air compressor.
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None of the above.
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13.
When you make a quick lane change, the crack-the-whip effect can turn the trailer over. The crack-the-whip effect is caused by:
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rearward amplification.
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worn tire tread.
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the rear trailer of a triple.
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strong wind.
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14.
If you must stop on a one-way or divided highway, you should place warning devices _______ toward the approaching traffic.
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5, 25 and 50 feet
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10, 100 and 200 feet
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3, 15 and 45 feet
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5, 50 and 500 feet
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15.
To start moving without rolling back, you should:
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partly engage the clutch before you take your right foot off the brake.
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put on the parking brake whenever necessary.
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apply the trailer brake hand valve.
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All of the above.
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16.
With brake drums, if brakes become too hot:
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the brakes will supply too much power to the drive wheels.
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The brakes may stop working
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your ABS will malfunction.
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the air compressor will kick on to cool the brakes.
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17.
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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18.
Which of the following is NOT correct? Anti-lock brakes:
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give drivers more control over the vehicle during braking.
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require drivers to apply the brakes as hard as they can without locking the wheels.
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help drivers avoid wheel lock up.
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help drivers avoid skids caused by over braking.
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19.
Watch out for black ice:
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when it is snowing.
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when the temperature is above freezing and the road is dry.
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right after it starts to rain.
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any time the temperature is below freezing and the road looks wet.
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20.
To make the brakes work, air brakes use:
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nitrogen.
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hydraulic air.
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carbon monoxide.
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compressed air.
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