Commercial Drivers License Written Practice Tests

1. Couple the slad hands together
2. Couple the glad hands to dummy couplers
3. Hang the electrical cable with the plug end down
4. All of the above acceptable

1. You won't be able to release the trailer brakes
2. You won't have any operational brakes
3. You won't be able to releas the tractor braks
4. You'll have no way of knowing there's a problem

1. Only during the day
2. With a distance of one second for every ten feet of your vehicle length
3. With a distance of one second for every twenty feet of your vehicle length
4. As close as possible so other don't cut in

1. Push in the tractor protection valve
2. Pull out the "air supply" knob
3. Stop engine so you can hear the brakes
4. Cross the air lines to check for leaks

1. Take one off the red air line and use thaht as a temporary replacement
2. You might end up with a service line air leak
3. You could experience an emergency line air leak
4. It's not a major problem and you should continue coupling

1. There's a little slack in the air lines
2. There's no slack in the air lines
3. The landing gear handle is hanging free
4. The electrical cable is unplugged

1. Only at highway speeds
2. Only when parking
3. Only to test the trailer brakes
4. Both B & C above

1. It keeps air in the tractor in the event the trailer air leaks
2. It is controlled by the trailer air supply valve in the cab
3. When in closes it allows air to leak from the tractor line
4. It will close automatically if air pressure is low

1. Back under the trailer at an angle
2. Align the tractor and trailer
3. Position the trailer kingpin in the center of the fifth wheel
4. Back under the traile in a straight line

1. The service air line
2. The emergency air line
3. The shut off valve
4. The hose coupler

Δ back to top