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Commercial Driving Questions - All Grades

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Continuing Education Commercial Driving
What is the purpose of the DECS on equipment with diesel engines?
  1. Improve fuel economy.
  2. Limit engine RPMs.
  3. Reduce emissions.
  4. Improve performance.
Continuing Education Commercial Driving
What does the pressure in the service line do?
  1. it tells how much presure the relay valve should send to the brakes
  2. its controled by the brake pedal
  3. its controlled by the trailer hand brake
  4. all of the above
Continuing Education Commercial Driving
When driving how far ahead should you look?
  1. 12- 15 seconds
  2. 30-60 seconds
  3. 5-15 seconds
  4. 2-60 seconds
Continuing Education Commercial Driving
Describe what the service line is for.
  1. carries air, which is controlled by the foot brake or the trailer hand brake.
  2. controlls the brakes
  3. keeps the engine from overheating
Continuing Education Commercial Driving
How do you maintain a speed that is not to fast when going down hill?
  1. weight, length of hill, steepness of hill, road conditions, weather
  2. use brakes
  3. do not accelerate
Continuing Education Commercial Driving
How do you correctly test a trailers emergency brakes ?
  1. Check under and around the vehicle for signs of any leaking. Don’t carry liquids or gases in a leaking tank. To do so is a crime.
  2. Charge the trailer air brake system and check that the trailer rolls freely. Then stop and pull out the trailer air supply control or place it in the “emergency” position. Pull gently on the trailer with the tractor to check that the trailer emergency brakes are on.
  3. On tank trailers, if your drive wheels or trailer wheels begin to skid, your vehicle may jackknife.
Continuing Education Commercial Driving
What is the service interval for the engine oil change?
Continuing Education Commercial Driving
How many shift service points are there for the front wheel bearings?
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