CDL DOUBLES TRIPLES PRACTICE TEST DISTRICT OF COLUMBIA
11.
Exhaust system parts should NOT:
|
rub against tires.
|
|
|
be loose.
|
|
|
rub against fuel system parts.
|
|
|
All of the above.
|
12.
Because of the "crack-the-whip" effect, doubles and triples:
|
are more likely to run out of gas than other combination vehicles.
|
|
|
are more likely to turn over than other combination vehicles.
|
|
|
are much slower than other combination vehicles.
|
|
|
can go much faster than other combination vehicles.
|
13.
In vehicles with air brakes, the air compressor governor:
|
controls how much air the air compressor will pump into the air storage tanks.
|
|
|
controls when the air compressor will pump air into the air storage tanks.
|
|
|
controls when the air storage tanks will pump air into the air compressor.
|
|
|
None of the above.
|
14.
Emergency brakes are:
|
not required on buses.
|
|
|
required on all vehicles.
|
|
|
not required on commercial vehicles with air brakes.
|
|
|
not required on doubles.
|
15.
If your vehicle has air brakes, to check that air flows to all trailers:
|
watch each trailer’s air gauge for a drop of 25 psi.
|
|
|
go to the rear of the second trailer and open the emergency line shut-off.
|
|
|
check that the fifth wheel is not so far forward that the tractor frame will hit the landing gear.
|
|
|
pull gently on the trailer with the tractor.
|
16.
If the air compressor is belt-driven, you should check the air compressor drive belt before each trip. The belt should be:
|
tight.
|
|
|
loose.
|
|
|
cracked.
|
|
|
worn.
|
17.
Why should you cover your cargo?
|
To protect people from spilled cargo.
|
|
|
Because spill protection is a safety requirement in many states.
|
|
|
To protect the cargo from weather.
|
|
|
All of the above.
|
18.
Which of the following is not a type of retarder?
|
Exhaust
|
|
|
Electric
|
|
|
Hydraulic
|
|
|
Pressure
|
19.
Off-tracking is:
|
when a vehicle towing a trailer skids, and the trailer pushes the towing vehicle from behind until it spins the vehicle around.
|
|
|
when a vehicle makes a turn and the rear wheels of the trailer end up driving in a different path than the tractor and the front wheels of the trailer.
|
|
|
when the tires lose their contact with the road and have little or no traction.
|
|
|
None of the above.
|
20.
You are driving a heavy vehicle with a manual transmission, and you have to stop on the shoulder while driving on an uphill grade. When putting your vehicle back in motion up the grade, you should:
|
partly engage the clutch before you take your right foot off the brake.
|
|
|
use the parking brake to hold the vehicle until the clutch engages.
|
|
|
shift down to a speed that you can control without using the brakes.
|
|
|
keep the clutch slipping while slowly accelerating.
|
GRADE ME
NOT SURE YOU WILL PASS? GET CDL PREMIUM NOW! - Learn More