CDL Permit Quiz

Air Brakes Test 1 CDL Test Nebraska
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1. The modulating control valve allows you to control:
  • Spring brakes.

  • Front brakes.

  • Amount of air pressure in the brake system.

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2. A slack adjusters freeplay needs to be adjusted if it is more than about____ how many inches when you pull hard on it?
  • one fourth inch

  • one half inch

  • one inch

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3. If your vehicle has an alcohol evaporator, it is there to:
  • Eliminate the need for daily tank draining.

  • Boost tank pressure the same way that turbocharges boost engine.

  • Reduce the risk of icing in air brake valves in cold weather.

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4. The air compressor governor controls:
  • The speed of the air compressor.

  • Air pressure applied to the brakes.

  • When air is pumped into the air tanks.

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5. If air pressure is not built up within the correct amount of time, then:
  • You should be ready to use your parking brakes to help stop.

  • The alcohol container may be low.

  • Your air pressure may drop too low during during T driving, requiring an emergency stop.

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6. How should you check that your service brakes are working properly?
  • Park on slight grade, drain off air pressure,set parking brake and check to the movement.

  • Park on a level ground, chock the wheels,engage the parking brakes when you have the correct amount of air pressure to do so and shut the engine off.

  • Park on level ground, wait until normal air pressure is reached, release the parking brake and move forward slowly at about 5 mph. Then apply the brakes firmly using the brake pedal.

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7. Under normal conditions in order to engage the parking brakes driver:
  • Turn off the engine.

  • Let the air out of air brake system.

  • Be sure that the air brake system is fully pressurized.

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8. To check the free play of manual slack adjusters of S-cam brakes, you should park on:
  • Level ground, chock the wheels and release the parking brakes.

  • Level ground and apply the parking brakes, then apply service brakes.

  • Level ground and drain off air pressure before checking the adjustment.

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9. Parking or emergency brakes of trucks and buses can be legally held on by____pressure.
  • spring

  • air

  • fluid

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10. With air brake vehicles, the parking brakes should be used:
  • Whenever you leave the vehicle unattended.

  • As little as possible.

  • Only during pre and post-trip inspections.

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11. The most important thing to do when a low air pressure warning comes on is:
  • Upshift.

  • Downshift.

  • Stop and safely park as soon as possible.

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12. Emergency controlled braking is when you:
  • Apply the brakes as hard rd as as you you can can without without locking the wheels.

  • Brake as hard as you can, release the brakes B when wheels locking, brakes back on again when the wheels start rolling.

  • Apply the hand valve for one second, then push hard on the brakes.

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13. Any time you park, use the parking brakes, except:
  • If the brakes are very hot (e.g., after just coming down grade a steep grade).

  • If you are going to test the parking brake make sure that it holds the vehicle.

  • If you will only be stopped for less then one hour.

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14. You have a major leak in the service line and put on the brakes. Service air pressure will escape and cause the:
  • trailer tank pressure to be lost.

  • tractor spring brakes to lock on.

  • trailer emergency brakes s to come on.

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15. The air brake lag distance at 55 mph on dry pavement adds about___feet.
  • 12

  • 32

  • 52

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16. If you are driving down a steep downgrade and you have reached your "safe" speed of 40 mph, you would apply the service brakes until your speed drops to___ mph.
  • 25

  • 30

  • 35

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17. If your truck has a properly functioning dual air brake system and minimum size air tanks the air pressure should build up from 85 to 100 psi within how many seconds?
  • 30

  • 45

  • 60

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18. All air brake equipped vehicles have:
  • A supply pressure gauge.

  • An air usage gauge.

  • A backup hydraulic system.

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19. The most common type of foundation brake found on heavy vehicles is the:
  • Wedge drum.

  • S-cam drum.

  • Disc brake.

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20. Your truck has a dual air system and one of the system loses its pressure. What will happen?
  • Brake drums will not be fully pressurized.

  • The manual slack adjusters of the S-cam brakes will not be set properly.

  • Either the front or back brake will not be fully operational.

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21. Which of these is NOT a proper time to apply the parking brakes?
  • To brake vehicle very hard, in other word.

  • To use parking brakes if you park for less than one hour.

  • If you are going to use the parking brakes C you need to make sure that they will hold the vehicle.

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22. If the spring brakes are on, when should you push the brake pedal?
  • Only when driving down a hill.

  • Only on the slippery road.

  • Never.

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23. If you do not have automatic tank drains, how often should you drain the oil and water from the bottom of compressed air storage tanks?
  • After every four hours of service.

  • At the end of each day of driving.

  • Once a week.

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24. When the brakes are applied the brake shoes (or linings) are pressed against the:
  • Brake drum or disc.

  • Slack adjuster.

  • S-cam.

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25. In ideal conditions, a truck or bus with an air brake going at 55 mph would require stopping distance of:
  • Less than 100 feet.

  • 100-300 feet.

  • More than 300 feet.

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26. It is not safe to drive a vehicle that has brake drums with cracks that are longer than ________ of the width of the friction area.
  • One half.

  • One fourth.

  • One eighth.

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27. The air loss rate for a straight truck or bus with the engine off and the brakes on should not be more than:
  • 1 psi in one minute.

  • 2 psi in 45 seconds.

  • 3 psi in one minute.

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28. Your brakes are fading when:
  • You have to push harder on the brake pedal to control your speed on a downgrade.

  • Less pressure is needed on the brake pedalfor each stop.

  • The brake pedal feel spongy when you apply pressure.

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29. The parking or emergency brake on a heavy vehicle can only be held in position ion by something that cannot leak away, like:
  • Spring pressure.

  • Air pressure.

  • Hydraulic pressure.

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30. Emergency stab braking is:
  • Press hard on a brake pedal and apply hand valve until you stop.

  • Use light steady pressure on the brake pedal.

  • Brake as hard as you can, release the brakes when the wheels locked, put on the brakes again when the wheels start rolling.

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31. The air compressor should stop pumping air when pressure reach _____ psi.
  • 100

  • 125

  • 150

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32. A straight truck or bus air brake system should not leak at the rate of more than _______ psi per minute with the engine off and the brakes released.
  • 1

  • 2

  • 3

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33. The S-cam:
  • Controls the flow air to each of the brake chambers.

  • Pulls the brake shoes away from the drum and allow the wheels to roll freely.

  • Forces the brake shoes against against the the inside inside of of the brake drum.

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34. Some air brake systems have an alcohol evaporator. What may happen if you don't keep the proper level of an alcohol?
  • The S-cam may not take back when you release the brake pedal.

  • Ice may form in the air storage storage tank tank and and cause a brake failure.

  • Ice may form on the brake drums and wear C them out.

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35. The use of air brakes on a long and steep downgrade under normal conditions is only a supplement to:
  • The use of the spring brakes.

  • The use of the front brakes limiting valve.

  • The braking effect of the engine.

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36. The brake system that applies and releases the brakes when the driver uses the brake pedal is the __________ brake system.
  • emergency

  • service

  • parking

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37. Why should you drain water from compressed air tanks?
  • The low boiling point of water reduces braking power.

  • Water can freeze in cold weather and cause brake failure.

  • To keep from fowling the air compressor oil.

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38. If you must make an emergency stop, you should brake so you:
  • Use the hand brake before the brake pedal.

  • vehicle stays in CT Can steer and so your vehicle stays in a straight line.

  • Use the full power of the brakes to lock them.

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39. Modern air brake systems combine three different systems. They are the service, the parking and the ______ brakes.
  • emergency

  • foot

  • S-cam

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40. The supply pressure gauge shows how much pressure:
  • Is in the air tanks.

  • Tractor brake lines.

  • Trailer brake lines.

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41. During normal driving, spring brakes are usually held back by:
  • Bolts.

  • Air pressure.

  • Spring pressure.

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42. Excessive use of the service brakes results in overheating which can lead to:
  • Improper adjustment of the S-cam.

  • Increased contact between the brake drums and brake linings.

  • Expansion of the brake drums.

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43. Excessive heat caused by using your brakes too often can also cause:
  • Modulating control valve to wear out.

  • Brake lines to plug.

  • Brakes to fade or fail.

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44. The proper use of the brakes when going down a long steep grade after selecting a proper gear is to brake until your speed is about _________ mph below the posted speed for your safety and release your brakes.
  • 5

  • 10

  • 15

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45. Repeatedly partially pressing and releasing the brake pedal may result in:
  • A loss of brake air pressure.

  • A build up of brake air pressure.

  • No change of brake air pressure.

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46. An air brake system is fully charged at ______ psi.
  • 75

  • 100

  • 125

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47. The stop light switch:
  • Tells you when the air brake system is low on air pressure.

  • Tells you when you need to use your emergency brakes.

  • Turns on your brake lights to warn drivers T behind you.

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48. In air brakes vehicles, the parking brakes should be used:
  • As little as possible.

  • Any time when vehicle is parked.

  • To hold your speed when going downhill.

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49. Air braking takes more time than hydraulic braking because air:
  • Brakes use different brake drums.

  • Takes more time to flow through the lines than hydraulic fluid.

  • Brakes require heavier return springs.

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50. Total stopping distance for air brakes is longer than that for hydraulic brakes due to_____ distance.
  • A brake lag

  • Breaction

  • Ceffective braking

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