CDL Manual

Question 1

Tread Depth in every major groove on front tires?

Answer 1

4/32

Question 2

Tread depth in every major groove on rear tires?

Answer 2

2/32

Question 3

How much steering wheel play

Answer 3

10 degrees; 2 inches out of a 20 inch wheel

Question 4

For leaf springs: If_____or more are missing, it will put the vehicle out of service.

Answer 4

one fourth

Question 5

What warning devices are needed for parked vehicles?

Answer 5

Three reflective triangles or at least 6 fuses or 3 liquid flares

Question 6

Air pressure should build from 50-90 psi within _______minutes

Answer 6

3

Question 7

Air pressure should build to a range of ______before the governor cuts out.

Answer 7

120-140 psi

Question 8

Idling oil pressure should be ______psi

Answer 8

5-20 psi

Question 9

Operating oil pressure range should be _____psi

Answer 9

35-75 psi

Question 10

Most good drivers look at least____to____seconds ahead.

Answer 10

12-15

Question 11

If you must stop on or by a one-way or divided highway, place warning devices every___feet,____feet and ____feet toward the approaching traffic.

Answer 11

10, 100, 200

Question 12

Air pressure should build from 50-90 psi whithin____minutes.

Question 13

If you stop on a two-lane road carrying traffic in both directions or on an undivided highway, place warning devices within___feet of the front or rear corners to mark the location of the vehicle and___feet behind and ahead of the vehicle.

Answer 13

10-100

Question 14

Back beyond any hill, curve, or other obstructions that prevents other drivers from seeing the vehicle within_____feet. If line of sight view is obstructed due to a hill or curve, where should the rear-most triangle be placed?

Answer 14

500; a point back down the road so warning is provided (before the curve)

Question 15

What is “the distance your vehicle travels in ideal conditions; from the time your eyes see a hazard until your brain recognizes it?

Answer 15

Perception distance

Question 16

The average perception time for an alert driver is_____seconds. At 55mph this will eaqual_____feet.

Answer 16

1.75 seconds; 142ft

Question 17

What is the total stopping distance formula?

Answer 17

Perception distance + Reaction Distance + Braking Distance + Brake Lag distance= Total stopping distance

Question 18

What is “the distance you will continue to travel, in ideal conditions; before you physically hit the brakes, in response to a hazard seen ahead”?

Answer 18

Reaction distance

Question 19

The average driver has a reaction time of _____of_____second(s). At 55 mph on dry pavement, it can take about ______ft.

Answer 19

.75-1 second; 61 feet.

Question 20

What is “the distance your vehicle will travel, in ideal conditions; while you are braking”?

Answer 20

Braking distance

Question 21

At 55mph on dry pavement with good brakes, braking distance can take about ______ft.

Answer 21

216 ft

Question 22

At 55mph, your vehicle will travel a minimum of _____ft as a total stopping distance.

Answer 22

419 ft

Question 23

When you double your speed from 20 to 40 mph, the impact to stopping distance is ____greater

Answer 23

4 times

Question 24

Empty trucks require______stopping distance

Answer 24

Greater

Question 25

Wet roads can_____stopping distance

Answer 25

Double

Question 26

On a wet road, reduce speeds by about_____. On packed snow, reduce speed by______or more. If the surface is icy, reduce speed to a crawl and stop driving as soon as you can safely do so.

Answer 26

1/3; 1/2

Question 27

When the temperature drops, bridges will freeze before the road will. Be especially careful when temperature is close to______degrees Fahrenheit.

Answer 27

32

Question 28

Hydroplaning can occur at speeds as low as _____mph if there is a lot of water.

Answer 28

30

Question 29

One good rule says you need at least_____for each____feet of vehicle length at speeds below 40mph. At greater speeds, you must add 1 second for safety.

Answer 29

1 second for each 10 feet of vehicle length

Question 30

What are three different braking systems for air brakes?

Answer 30

Service brake, parking brake, emergency brake

Question 31

What is the air brake governor “cut out” pressure?

Answer 31

120 psi

Question 32

What is the air brake governor “cut in” pressure?

Answer 32

100 psi

Question 33

A safety relief valve is installed in the first tank the air compressor pumps air to. the safety valve protects the tank and the rest of the system from too much pressure. The valve is usually set to open at____psi.

Answer 33

150

Question 34

Low pressure warning alarms: A warning signal you can see must come on before the air pressure in the tanks falls below_____psi.

Answer 34

60

Question 35

Tractor and straight truck spring brakes will come fully on when air pressure drops to a range ___psi.

Answer 35

20-40

Question 36

Air brake vehicles built after _____are required to be equipped with Antilock brakes.

Answer 36

March 1, 1998

Question 37

Before driving a vehicle with a dual air system, allow time for the air compressor build up a minimum of ______psi pressure in both primary and secondary systems.

Answer 37

100

Question 38

If a slack adjuster moves more than about _______where the push rod attaches to it, it probably needs adjustment.

Answer 38

1 inch

Question 39

Test air leakage rate: The loss rate should be less than_______psi in one minute for single vehicles and less than _____psi in one minute for combination vehicles.

Answer 39

1; 3

Question 40

When the engine is at operating rpms, the pressure should build from 85 to 100 psi within ______ seconds in dual air system.

Answer 40

45