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Class F Exam With Complete Solutions Latest Update
What tread depth is required on front and rear tires - ANSWER 4/32in (front); 2/32 (rear) steering wheel play of more than _________ can be hard to steer - ANSWER 10 degrees (2in on a 20 in wheel)
A vehicle is out of service when how many leaves of a leaf spring is missing? - ANSWER1/4 or more
What emergency equipment is required? - ANSWER Spare electric fuses; fireextinguisher; 3 warning devices (reflective or flare)
How do test for hydraulic leaks? - ANSWER Pump the break x3 and hold firm pressurefor 5sec.
How do you test parking break? - ANSWER Fasten seatbelt; set parking break; placevehicle in low gear; Pull forward against parking break
How do you test the service break? - ANSWER Go 5mph; push break firmly and insure itdoesn't pull to one side.
Good drivers look ________ ahead when driving. - ANSWER 12-15 sec These reduce the need for using breaks - ANSWER Retarders Retarders should not be used when_____ bc it can cause skidding - ANSWER Icy;wet;snowing
Slow down and shift down when. - ANSWER Going down hill or entering a curve Total stopping distance is =? - ANSWER Perception distance + react distance +breaking distance + breaking lag distance
The average driver has a reaction speed of - ANSWER 3/4-1 second Where should warning devices be placed on a one-way divided highway - ANSWER 10 ft,100ft, 200ft towards approaching traffic
Where should you place warning device on two-way - ANSWER 10ft from front and/orrear of vehicle; 100 ft from from and rear of vehicle
A vehicle traveling 55mph needs a total of approximately _______ to stop? - ANSWER450ft
Warn driver by _____ or _______ when legal. - ANSWER Flashing your lights; using yourhorn
What is your most important objective? - ANSWER To select and maintain a speed that isnot too fast for the length and grade of the hill, road conditions, or the weight of the vehicle/cargo, or the weather. When following, you must allow ___ sec for every ____ft. Add an additional ____sec whentraveling over ____ mph or when road is slippery. - ANSWER 1;10;1;
Wet brakes may cause breaks to apply _____. - ANSWER Uneven Why don't you turn wide left when making a right turn? - ANSWER Someone may try topass you on the right.
What's the most important hand for backers? - ANSWER Stop Emergency warning devices must be put out within _____. - ANSWER 10 min True or false: loaded trucks need a longer breaking distance to stop. - ANSWER False:Brakes are designed to work best when loaded, bc the weight causes more traction to the tires and the road. How many hrs of sleep does most ppl need? - ANSWER 7-8hrs BAC depends on what? - ANSWER -the amount of alcohol drank -body weight -how fast the alcohol was drank BAC is lowered by what? - ANSWER Time Total weight of vehicle + weight of load =? - ANSWER Gross vehicle weight The air tanks should be drained when? - ANSWER At the end of each day Belts shouldn't have more than ____ give/play. - ANSWER 3/4 in What is the most important reason for doing a vehicle inspection? - ANSWER safety What things should you check during a trip? - ANSWER Watch gauges, mirrors, and useyour senses to check for problems.LOOK, LISTEN, AND SMELL.
It is illegal to operate a vehicle at a BAC of ____ or higher. - ANSWER 0.04% If you have committed two serious traffic violations within 3 yrs, you will lose yourlicense for at least ____. - ANSWER 60 days
If convicted of a 3rd violation of traffic laws, you will lose you license for ______. -ANSWER 120 days
You will lose you CDL for _____ if you are convicted of your first out-of-service order. -ANSWER 180 days
You will loose your CDL for _____ if you commit two out-of-service orders. - ANSWER 2yrs
You will loose you CDL for ____ if the offense occur while operating a vehicle that isplacard for hazardous materials. - ANSWER 3 yrs
You will loose your CDL for at least _____ if you commit 3 or more out-of-service orders. -ANSWER 3 yrs.
Tire problems consists of. - ANSWER -too much or too little air pressure -cuts or damage-dual tires that come in contact -mismatch sizes -radial and bypass tires used together-damaged valve stem
Wheel or rim problems. - ANSWER -damaged rims-rust around wheel nuts (meaning loose)
Operating oil Pressure - ANSWER 35-75psi Air pressure should build to ___________ within 3 minutes - ANSWER 50-90 psi Build air pressure until governor cut off, usually ____ to ____psi. - ANSWER 120- What are the 4 types of retarders? - ANSWER hydraulic, engine, exhaust, and electrical what are the types of curved mirrors - ANSWER convex, bug-eyed, fish-eyed, spot everything looks _____ when looking in a convex mirror rather than looking directly at it.- ANSWER smaller and farther away
what are the 3 rules for using turning signals? - ANSWER -signal early-signal continuously -cancel your signal At 55mph avg reaction time accounts for approx. ___ft traveled. - ANSWER 61 The avg perception time for an alert driver is _____. - ANSWER 1 3/4 seconds. At 55 mph, avg perception time accounts for _____ traveled. - ANSWER 142 ft At 55 mph on dry pavement with good brakes, your braking distance is about ______ tocomplete the braking distance. - ANSWER 216 ft
At 55 mph, you total stopping distance is a minimum of _______. - ANSWER 419 ft
When you double you speed from 20 to 40 mph the impact is ______ greater. - ANSWER 4times
When you double your speed from 20 to 40 mph, the breaking distance is _____ greater. -ANSWER 4 times
When you triple you speed from 20 to 60 mph, the impact and braking distance is ______greater. - ANSWER 9 times
At 60 mph, your stopping distance is greater than the length of a _______. - ANSWERFootball field
Increase you speed from 20 to 80, the impact and braking distance is _______ greater. -ANSWER 16 times
Wet roads can increase you stopping distance by how much? - ANSWER Double On wet roads, you should decrease you speeds by how much? - ANSWER 1/3 ( ie 55 to35 mph)
On packed snow, reduce speed by how much? - ANSWER Half or more? If the surface is icy, reduce speed to _______ and ______ as soon as you can safely do so?- ANSWER Crawl; stop driving
Hydroplaning can occur at speeds as low as _____. - ANSWER 30 mph Hydroplaning is more likely if tire pressure is _____ or _____ - ANSWER Low; tread worn When you're driving in heavy traffic, the safest speed is______ - ANSWER The speed of
-put pride in back seat -avoid eye contact -ignore gestures You are at greatest risk when? - ANSWER driving at night how far ahead can you see with low beams - ANSWER 250ft How far ahead can you see with high beams? - ANSWER 350-500ft Avoid driving through deep puddles, but if now how? - ANSWER -Slow down and shift tolow gear -gently put on brakes -increase rpm and keep light pressure on brakes-once out of water, apply light pressure to warm brakes -make test stop where and when safe to do so in very hot weather check tires every ______ or every _____. ANSWER 2 hrs; 100 miles Tar in the road pavement often rises to the surface in very hot weather this is referred toas what? - ANSWER Bleeding Tar
Passive Crossing This crossing has no type of traffic control device installed on it. -ANSWER Passive Crossing What sign do passive crossings have? - ANSWER Yellow circular advance warning signs and crossbucks with RR Active Crossing This crossinghas a traffic control device installed at the crossing to control the traffic.
When the road crosses more than one set of tracks, how can you tell how many? -ANSWER There's a sign bellow the crossbucks that indicates the number of tracks
It takes a typical tractor-trailer at least _____ to clear a single track and more than _____to clear a double track. - ANSWER 14 sec; 15 sec
What trailers can get stuck on raised crossings? - ANSWER Low Slung units andSingle-axel with a long trailer
If you are forced to return to the road before you can stop. - ANSWER hold the wheeltightly and turn sharply enough to get right back on the road safely. Don't try to edge gradually Controlled Braking-When you apply the brakes as hard as you can without locking thewheels, keep steering wheel movements is called what kind of braking
Stab Braking-When you apply your brakes all the way, release brakes when wheels lockup and as soon as the wheels start rolling you apply the brakes fully again, is called what kind of braking? If the steering feels "heavy", it's probably a sign of what? - ANSWER One of the fronttires has failed
Failure of what usually causes "fishtail"? - ANSWER One of the rear tires What usually prevents "fishtail" in rear tire failure? - ANSWER dual rear tires A skid happens whenever the tires lose their grip on the road and is caused in whatways? - ANSWER - Over-breaking
- Over-steering- Over-acceleration
- Driving too fast
A visible warning signal must come on before the air pressure in the tanks falls below______. - ANSWER 55 psi
On large buses, the low pressure warning device often signals at ______. - ANSWER80-85 psi
When you move the control to the _______ position, the limiting valve reduces the"normal" air pressure to the front brakes by half. - ANSWER Slippery
Tractor and straight truck spring brakes will fully apply when air pressure falls within arange of ________ (usually _______). - ANSWER 20-45 psi; 20-30 psi
You should apply the brake pedal when the spring brakes are on. True or False? -ANSWER False (the combined pressure of spring brakes and air pressure could damage the brakes) Truck tractors with air brakes built on or after ______ must be equipped with an ABSsystem. - ANSWER 03/01/
Before driving a vehicle with a dual air system, take some time for the air compressor tobuild up at least ________ in both the primary and secondary systems. - ANSWER 100 psi
The warning light and buzzer should come on before the air pressure drops below_________ psi in either system of a dual brake system. - ANSWER 60 psi
What is the most common problem found in roadside inspection? - ANSWEROut-of-adjustment brakes
all vehicles since _______ have automatic slack adjustors. - ANSWER 1994
Brake drums must not have cracks longer than _____ of the friction area. - ANSWER 1/ When the engine is at operating rpms, the pressure should build from _______ within ____in a dual air system. - ANSWER 85- 100 psi; 45 sec
In single air systems, normal requirements are pressure build up from _____ within______ with the engine at an idle speed of _______. - ANSWER 50-90 psi; 3 mins; 600- rpm The air loss rate must be less than ____ in ____ for single vehicles and less than ______ in_____ for combination vehicles. - ANSWER 2 psi in 1 min ; 3 psi in 1 min
How many seconds is the delay in "brake lag" with air brakes - ANSWER 1/2 sec or more The air brake lag distance at 55 mph on dry pavement adds approximately ___ feet toyour stopping distance. - ANSWER 32 ft
Thus at 55 mph, with air brakes the total stopping distance is over _____. - ANSWER450ft
What are some things that can make brakes fade or fail? - ANSWER Over heating, lowair pressure, and not relying on the engine braking effect.
Check the belts for snugness (up to _____ play at center of belt), cracks, or frays: -ANSWER 3/4 in
When checking steering play for both power steering and non-power steering, youcheck with the engine running. True or False - ANSWER False ( Power steering only)
If the vehicle is so equipped, how do you check the hydraulic brake reserve/back-upsystem during a pre-trip inspection? - ANSWER With the key off, depress the brake
