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CDL EXAM QUESTIONS
Actual Qs and Ans Expert-Verified Explanation
This Exam contains:
-Guarantee passing score -55 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation
Question 1: to drive a tractor trailer with air brakes you must
Answer:
I have a class A CDL without an air brakes restriction Question 2: under ideal conditions the average driver of a truck or bus with air brakes traveling at 55 miles an hour would require what's stopping
Answer:
more than 400 ft Question 3: the the air compressor will stop pumping air into the air tanks at - - PSI
Answer:
125 Question 4: according to Federal Regulation on air brakes the brake linings of drum brakes must be
Answer:
- / 4 in
Question 5: to check the slack adjuster on a scam drum brakes you should first
Answer:
Park on level ground, talk the wheels, and release the parking brakes
Question 6: when should you manually adjust automatic slack adjusters
Answer:
only if not working properly
Question 7: when will a low air pressure warning signal come on
Answer:
60 PSI - 55 PSI
Question 8: if the low air pressure warning signal is not working it may what
Answer:
lead to sudden emergency braking in a single circuit air system Question 9: beautiful has a single. One of the system loses air pressure what will happen
Answer:
either the front or rear brakes will not be fully operational
Question 10: the braking power of spring brakes
Answer:
depends on the weather the service brakes are improper adjustment Question 11: what class drivers license do you need to pull a trailer whose gross vehicle weight rating exceeds 10000 pounds
Answer:
class A CDL Question 12: in Idaho what do you need a DOT medical card in your possession to transport
Answer:
Christmas trees fresh fruit and bees does not include preserved fruit such as canned
Question 13: how should you drive a tractor-trailer combination vehicle with antilock brake systems
Answer:
Drive the vehicle the same way that you always have. Only use the breaking this certain keep control, pay attention when you slow, and break the same way regardless of what you're driving. Never speed up and let his part of a safety driving process already
Question 14: what can cause brakes to fail or fade
Answer:
overheating, low air pressure, not relying on engine braking effect Question 15: according to Federal Regulations on air brakes the brake lining on drum brakes must be at least - - thick
Answer:
- / 4 in
Question 16: what measurement is the safety valve usually set to open
Answer:
150 psi
Question 17: what is the purpose of an alcohol evaporator
Answer:
to prevent buildup of ice in the air brake system
Question 18: Foundation brakes are located
Answer:
at all Wheels Question 19: what is the best way to test your vehicle's low air pressure warning signal
Answer:
with engine off stuff on and off the brake pedal to lower air pressure below 60 PSI Question 20: after the initial drop the maximum acceptable leakage of PSI permanent AR
Answer:
- PSI for a vehicle and 4 PSI for combination vehicle
Question 21: the parking brake control does what
Answer:
what's the air out of the brake chamber
Question 22: the braking power of spring brakes
Answer:
depends on whether the service brakes are properly adjusted. if they are not neither service brakes nor the emergency brake will work properly
Question 23: what is a supply pressure gauge used for
Answer:
show how much pressure in the tank
Question 24: when to use parking brake
Answer:
every time you leave your vehicle except for when the brakes are very hot or they're wet and risk of freezing Question 25: Tascam drum brakes have an S cam in each brake chamber, why is it called a nest cam
Answer:
it is shaped like a letter s
Question 26: under which conditions are front wheel brakes good
Answer:
all weather conditions Question 27: before you drive a vehicle with dual air brake systems, wait until the pressure in each system reaches at least
Answer:
100 PSI
Question 28: at what PSI should the air compressor stops pumping air into
Answer:
- 25
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