CDL PT Flashcards
When you are driving in heavy traffic, what is the safest speed?
The speed of other vehicles.
Which of the following does NOT cause front-wheel skids?
Not enough weight on the tandem trailer axle.
The service brake system applies and releases the parking brakes when you pull out and push in the parking brake control knob.
True.
ABS brake systems are good because they help prevent power and turning skids.
False.
The emergency brake system uses parts of the service and parking brake systems to stop the vehicle in the event of a brake system failure.
True.
All air brake systems have an alcohol evaporator so you can put alcohol into the air brake system.
False.
What is the maximum amount that the air pressure can drop in one minute during a Static Leakage Test?
Air pressure should drop no more than two psi for single vehicles, three psi for a combination of two vehicles, and five psi for a combination of three or more vehicles.
Letting up on the brake pedal reduces the air pressure and releases the brakes.
True.
A proper oil pressure range with the engine “operating” is ________.
35–75 PSI.
Which of the following best describes the “Heavy Vehicle Formula”?
One second for every 10 feet of vehicle length at speeds below 40 mph adding 1 second for speeds over 40 mph.
What are the maximum leakage rates for an air brake system?
The loss rate should be less than two psi in one minute for single vehicles and less than three psi in one minute for combination vehicles.
How often must you stop while on the road to check your cargo?
Within 25 - 50 miles after beginning a trip, after every break, and every 3 hrs, 150 miles.
What must you check before transporting a sealed load?
Check that the load is of legal weight.
Letting up on the brake pedal increases the air pressure and releases the brakes.
False.
The purpose of an alcohol evaporator is to put alcohol into the air system.
False.
