General Knowledge CDL Practice Tests

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  • 6 timed real-life sets
  • Full explanations from the DMV Handbook
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Timed Test 1

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Question 1

You should not move a severely injured person at a crash scene unless...?

A
They are holding up traffic
B
They request you to
C
Any of these apply
D
They are in immediate danger
Question 1 Explanation: 
2.20.3 – Care for the Injured If a qualified person is at the accident and helping the injured, stay out of the way unless asked to assist. Otherwise, do the best you can to help any injured parties. Here are some simple steps to follow in giving assistance: • Do not move a severely injured person unless the danger of fire or passing traffic makes it necessary. • Stop heavy bleeding by applying direct pressure to the wound. • Keep the injured person warm. Source: California Commercial Driver Handbook
Question 2

In the event of a cargo fire in a van or box trailer, you should...

A
park close to the road so other vehicles can see the danger and call for assistance
B
drive to the closest service station for assistance
C
keep the doors open
D
keep the doors shut
Question 2 Explanation: 
2.21.3-Fire Fighting Knowing how to fight fires is important. Drivers who did not know what to do have made fires worse. Know how the fire extinguisher works. Study the instructions printed on the extinguisher before you need it. Here are some procedures to follow in case of fire. Pull Off the Road. The first step is to get the vehicle off the road and stop. In doing so: • Park in an open area, away from buildings, trees, brush, other vehicles, or anything that might catch fire. • Do not pull into a service station! • Notify emergency services of your problem and your location. Keep the Fire From Spreading. Before trying to put out the fire, make sure that it does not spread any further. • With an engine fire, turn off the engine as soon as you can. Do not open the hood if you can avoid it. Shoot foam through louvers, radiator, or from the vehicle’s underside. • For a cargo fire in a van or box trailer, keep the doors shut, especially if your cargo contains hazardous materials. Opening the van doors will supply the fire with oxygen and can cause it to burn very fast.
Question 3

The B:C type fire extinguisher is designed to work on burning wood, paper, and cloth

A
TRUE
B
FALSE
Question 3 Explanation: 
2.21.3 – Fire Fighting Use the Right Fire Extinguisher • Figures 2.20 and 2.21 detail the type of fire extinguisher to use by class of fire. • The B: C type fire extinguisher is designed to work on electrical fires and burning liquids. • The A: B: C type is designed to work on burning wood, paper, and cloth as well. • Water can be used on wood, paper, or cloth, but do not use water on an electrical fire (can cause shock) or a gasoline fire (it will spread the flames).
Question 4

The Gross Combination Weight Rating is the...

A
total weight of a single vehicle plus its load
B
total weight of a powered unit plus trailer(s) plus the cargo
C
maximum total weight of a power until plus trailer(s) plus the cargo as specified by the manufacturer
D
maximum total weight of a single vehicle plus its load specified by the manufacturer
Question 4 Explanation: 
3.2 – Cargo Weight and Balance 3.2.1 – Definitions you Should Know Gross Vehicle Weight Rating (GVWR). The value specified by the manufacturer as the loaded weight of a single vehicle.
Question 5

A top-heavy load is dangerous because it can cause

A
all of the above
B
a rollover if you swerve around a hazard
C
damage to the axles or steering
D
a rollover on a curve
Question 5 Explanation: 
3.2 – Cargo Weight and Balance 3.2.3 – Do Not be Top-Heavy The height of the vehicle’s center of gravity is very important for safe handling. A high center of gravity (cargo piled up high or heavy cargo on top) means you are more likely to tip over. It is most dangerous in curves, or if you have to swerve to avoid a hazard. It is very important to distribute the cargo so it is as low as possible. Put the heaviest parts of the cargo under the lightest parts.
Question 6

What is the minimum distance between tie downs to prevent shifting of cargo?

A
Every eighteen feet
B
Every six feet
C
Every ten feet
Question 6 Explanation: 
3.2 – Cargo Weight and Balance 3.3.2 – Cargo Tie-down Cargo should have at least one tie-down for each 10 feet of cargo.
Question 7

If you are transporting livestock,

A
there is always a high center of gravity
B
use false bulkheads with less than a full load
C
give livestock enough room to roam freely
D
rollover is less likely
Question 7 Explanation: 
3.4 – Cargo Needing Special Attention 3.4.3 – Livestock Livestock can move around in a trailer, causing unsafe handling. With less than a full load, use false bulkheads to keep livestock bunched together. Even when bunched, special care is necessary because livestock can lean on curves. This shifts the center of gravity and makes rollover more likely.
Question 8

Why should you exercise special care when transporting dry bulk tanks?

A
Dry bulk tanks are the most expensive cargo items to carry
B
High center of gravity and the load can shift
C
Low center of gravity
D
There is no particular reason why you need to exercise special care to transport dry bulk tanks
Question 8 Explanation: 
3.4 – Cargo Needing Special Attention 3.4.1 – Dry Bulk Dry bulk tanks require special care because they have a high center of gravity, and the load can shift. Be extremely cautious (slow and careful) going around curves and making sharp turns.
Question 9

When accelerating...

A
Speed up smoothly and gradually and avoid jerking
B
"Hammer down" when you wheels start to spin
C
Always use the parking brake to slow down
D
Do not engage the clutch before you take your foot off the brake
Question 9 Explanation: 
2.2 – Basic Control of Your Vehicle 2.2.1 – Accelerating Do not roll back when you start. You may hit someone behind you. If you have a manual transmission vehicle, partly engage the clutch before you take your right foot off the brake. Put on the parking brake whenever necessary to keep from rolling back. Release the parking brake only when you have applied enough engine power to keep from rolling back. On a tractor-trailer equipped with a trailer brake hand valve, the hand valve can be applied to keep from rolling back. Speed up smoothly and gradually so the vehicle does not jerk. Rough acceleration can cause mechanical damage. When pulling a trailer, rough acceleration can damage the coupling. When starting a bus on a level surface with good traction, there is often no need for the parking brake. Speed up very gradually when traction is poor, as in rain or snow. If you use too much power, the drive wheels may spin. You could lose control. If the drive wheels begin to spin, take your foot off the accelerator.
Question 10

Shifting into a lower gear and removing your foot off of the accelerator to slow your vehicle is known as?

A
Engine braking
B
Double clutching
C
Anti-lock braking
D
Brake fade
Question 10 Explanation: 
2.3 – Shifting Gears 2.3.4 – Retarders Some vehicles have “retarders.” Retarders help slow a vehicle, reducing the need for using your brakes. They reduce brake wear and give you another way to slow down. There are 4 basic types of retarders (exhaust, engine, hydraulic, and electric).
Question 11

When backing your vehicle, which of the following is NOT recommended?

A
Use the lowest reverse gear
B
Back towards the right side
C
Backing as slow as possible
D
Back and turn towards the driver's side
Question 11 Explanation: 
2.2 – Basic Control of Your Vehicle 2.2.4 – Backing Safely Because you cannot see everything behind your vehicle, backing is always dangerous. Avoid backing whenever you can. When you park, try to park so you will be able to pull forward when you leave. When you have to back, here are a few simple safety rules: • Start in the proper position. • Look at your path. • Use the mirrors on both sides. • Back slowly. • Back and turn toward the driver’s side whenever possible. • Use a helper whenever possible.
Question 12

Which of the following is NOT a basic skill needed to operate a commercial vehicle?

A
Ability to multitask while driving
B
Ability to accelerate
C
Ability to steer
D
Ability to back the vehicle safely
Question 12 Explanation: 
2.2 – Basic Control of Your Vehicle To drive a vehicle safely, you must be able to control its speed and direction. Safe operation of a commercial vehicle requires skill in: • Accelerating. • Steering. • Stopping. • Backing safely. Fasten your seatbelt when on the road. Apply the parking brake when you leave your vehicle.
Question 13

Which of these is NOT a rule to follow for backing safely?

A
Make use of a helper as often as possible
B
Combine backing and turning toward the driver's side whenever you can
C
Back slowly while using your mirrors
D
Accelerate slightly to complete the backing process quickly
Question 13 Explanation: 
2.2.4 – Backing Safely Because you cannot see everything behind your vehicle, backing is always dangerous. Avoid backing whenever you can. When you park, try to park so you will be able to pull forward when you leave. When you have to back, here are a few simple safety rules: • Start in the proper position. • Look at your path. • Use the mirrors on both sides. • Back slowly. • Back and turn toward the driver’s side whenever possible. • Use a helper whenever possible.
Question 14

Which of the following provide extra gears on some trucks?

A
Both of the Above Answers
B
Auxiliary Transmissions
C
Multi-Speed Rear Axles
Question 14 Explanation: 
2.3 – Shifting Gears 2.3.2 – Multi-Speed Rear Axles and Auxiliary Transmissions Multi-speed rear axles and auxiliary transmissions are used on many vehicles to provide extra gears. You usually control them by a selector knob or switch on the gearshift lever of the main transmission. There are many different shift patterns. Learn the right way to shift gears in the vehicle you will drive.
Question 15

Road rage is the act of operating a motor vehicle in a selfish, bold, or pushy manner, without regard for the rights or safety of others

A
TRUE
B
FALSE
Question 15 Explanation: 
2.10 – Aggressive Drivers/Road Rage 2.10.1 – What is It? Aggressive driving and road rage is not a new problem. However, in today’s world, where heavy and slow-moving traffic and tight schedules are the norm, more and more drivers are taking out their anger and frustration in their vehicles. Crowded roads leave little room for error, leading to suspicion and hostility among drivers and encouraging them to take personally the mistakes of other drivers. Aggressive driving is the act of operating a motor vehicle in a selfish, bold, or pushy manner, without regard for the rights or safety of others. One sign of an aggressive driver is a driver changing lanes frequently and abruptly without notice. Road rage is operating a motor vehicle with the intent of doing harm to others or physically assaulting a driver or their vehicle.
Question 16

In some emergencies, you may have to drive off the road and onto the shoulder in order to avoid collision with another vehicle. If possible, you should avoid

A
All of the above
B
using the brake until your speed has dropped to about 20 mph
C
coming to a complete stop before returning to the road
D
keeping one set of wheels on the pavement
Question 16 Explanation: 
2.17 – Driving Emergencies 2.17.1 – Steering to Avoid an Accident Leaving the Road. In some emergencies, you may have to drive off the road. It may be less risky than facing an accident with another vehicle. Most shoulders are strong enough to support the weight of a large vehicle and, therefore, offer an available escape route. Here are some guidelines, if you do leave the road. • Avoid Braking. If possible, avoid using the brakes until your speed has dropped to about 20 mph. Then brake very gently to avoid skidding on a loose surface.
Question 17

If an oncoming driver has drifted to your lane, the best thing to do is...?

A
Stay in the center of the lane
B
Move to the right
C
Move to the left
D
Hold whatever position you are in
Question 17 Explanation: 
2.17 – Driving Emergencies 2.17.1 – Steering to Avoid an Accident Where to Steer. If an oncoming driver has drifted into your lane, a move to your right is best. If that driver realizes what has happened, the natural response will be to return to his or her own lane.
Question 18

On older brake systems, the ABS lamp may stay on until you reach a speed in excess of...?

A
10 mph
B
20 mph
C
5 mph
D
15 mph
Question 18 Explanation: 
2.18 – Antilock Braking Systems 2.18.3 – How to Know if Your Vehicle is Equipped With ABS As a system check on newer vehicles, the malfunction lamp comes on at start-up for a bulb check, and then goes out quickly. On older systems, the lamp could stay on until you are driving over 5 mph.
Question 19

You're driving a rig on which only the trailer, not the tractor, has ABS. What should you do?

A
Turn off ABS
B
Brake harder than usual
C
Brake normally
D
Avoid heavy braking
Question 19 Explanation: 
2.18.5 – ABS on the Tractor Only or Only on the Trailer Having ABS on only the tractor, only the trailer, or even on only 1 axle, still gives you more control over the vehicle during braking. Brake normally.
Question 20

Which of these should you NOT do during a drive wheel skid?

A
Steer into the skid
B
Stop braking
C
Turn quickly
D
Counter steer
Question 20 Explanation: 
2.17 – Driving Emergencies 2.19 – Skid Control and Recovery 2.19.2 – Correcting a Drive-Wheel Braking Skid Do the following to correct a drive-wheel braking skid. • Stop Braking. This will let the rear wheels roll again, and keep the rear wheels from sliding. • Countersteer. As a vehicle turns back on course, it has a tendency to keep on turning. Unless you turn the steering wheel quickly the other way, you may find yourself skidding in the opposite direction. Learning to stay off the brake, turn the steering wheel quickly, push in the clutch, and countersteer in a skid takes a lot of practice. The best place to get this practice is on a large driving range or “skid pad."
Question 21

If your oil pressure is below the indicated limit, you should...?

A
Top it up at the end of the day
B
Top it up at your next stop
C
Stop immediately
D
Note it on your report
Question 21 Explanation: 
2.1.5 – 7-Step Inspection Method Figure 2.5 Low, Dropping, Fluctuating: STOP IMMEDIATELY! Without oil the engine can be destroyed rapidly
Question 22

Which of the following is a good thing to do when driving at night?

A
Wear sunglasses to reduce headlight glare
B
Look directly at oncoming headlights briefly
C
Keep your instrument lights bright
D
Keep your speed slow enough that you can stop within the range of your headlights
Question 22 Explanation: 
2.11 – Driving at Night 2.11.4 – Vehicle Factors Headlights. At night your headlights will usually be the main source of light for you to see by and for others to see you. You cannot see nearly as much with your headlights as you see in the daytime. With low beams you can see ahead about 250 feet and with high beams about 350-500 feet. You must adjust your speed to keep your stopping distance within your sight distance. This means going slowly enough to be able to stop within the range of your headlights. Otherwise, by the time
Question 23

Which of these is the only reliable way to get rid of fatigue?

A
Stop and sleep
B
Turn up your radio
C
Drink caffeinated beverages
D
Open your cab windows
Question 23 Explanation: 
2.11.2 – Driver Factors Maintaining Alertness While Driving: • Protect yourself from glare and eyestrain with sunglasses. • Keep cool by opening the window or using the air conditioner. • Avoid heavy foods. • Be aware of down time during the day. • Have another person ride with you, and take turns driving. • Take periodic breaks – about every 100 miles or 2 hours during long trips. • Stop driving and rest or take a nap. • Caffeine consumption can increase awareness for a few hours, but do not drink too much. It will eventually wear off. Do not rely on caffeine to prevent fatigue. • Avoid drugs. While they may keep you awake for a while, they will not make you alert. If you are drowsy, the only safe cure is to get off the road and sleep. If you do not, you risk your life and the lives of others.
Question 24

Should you turn the retarder off when the road is wet, icy, or snow covered?

A
No, because the engine retarder will have no effect on traction
B
No, because you need more braking power then
C
Yes, whenever your drive wheels have poor traction the retarder may cause a skid
Question 24 Explanation: 
2.13.2 – Driving on Slippery Surfaces. Slippery Surfaces. Drive slowly and smoothly on slippery roads. If it is very slippery, you should not drive at all. Stop at the first safe place. • Start Gently and Slowly. When first starting, get the feel of the road. Do not hurry. • Check for Ice. Check for ice on the road, especially bridges and overpasses. A lack of spray from other vehicles indicates ice has formed on the road. Also, check your mirrors and wiper blades for ice. If they have ice, the road most likely will be icy as well. • Adjust Turning and Braking to Conditions. Make turns as gently as possible. Do not brake any harder than necessary, and do not use the engine brake or speed retarder. (They can cause the driving wheels to skid on slippery surfaces.)
Question 25

At which of these points in a rainstorm will the road be most slippery?

A
Just before the rain starts
B
20 minutes after the rain starts
C
One hour after the rain starts
D
Just after the rain starts
Question 25 Explanation: 
2.6.2 – Matching Speed to the Road Surface Just After Rain Begins. Right after it starts to rain, the water mixes with oil left on the road by vehicles. This makes the road very slippery. If the rain continues, it will wash the oil away.
Question 26

Which of the following is NOT a main concern when you are driving in very hot weather?

A
Loose belts possibly causing overheating
B
Tar bubbling up and causing slippery roadways
C
Your seat belt causing you to sweat
D
Driving slowly enough to prevent overheating
Question 26 Explanation: 
2.14.2 – Driving in the Heat. Watch for Bleeding Tar. Tar in the road pavement frequently rises to the surface in very hot weather. Spots where tar “bleeds” to the surface are very slippery. Go Slowly Enough to Prevent Overheating. High speeds create more heat for tires and the engine. In desert conditions the heat may build up to the point where it is dangerous. The heat will increase chances of tire failure or even fire, and engine failure. 2.14.1 – Vehicle Checks Engine Belts. Learn how to check v-belt tightness on your vehicle by pressing on the belts. Loose belts will not turn the water pump and/or fan properly. This will result in overheating. Also, check belts for cracking or other signs of wear.
Question 27

If you have to swing out to make a right-hand turn, you should do so by taking up...?

A
The left-hand lane of the road you are leaving
B
The center of the intersection
C
The left-hand lane of the road you are turning into
D
Any of these depending on circumstances
Question 27 Explanation: 
2.7.6 – Space for Turns The space around a truck or bus is important in turns. Large vehicles can hit other vehicles or objects during turns because of wide turning and off-tracking. Right Turns. Here are some rules to help prevent right-turn accidents: • Turn slowly to give yourself and others more time to avoid problems. • If you are driving a truck or bus that cannot make the right turn without swinging into another lane, turn wide as you complete the turn. Keep the rear of your vehicle close to the curb. This will stop other drivers from passing you on the right. • Do not turn wide to the left as you start the turn. A following driver may think you are turning left and try to pass you on the right. You may crash into the other vehicle as you complete your turn. • If you must cross into the oncoming lane to make a turn, watch out for vehicles coming toward you. Give them room to go by or to stop. However, do not back up for them, because you might hit someone behind you. See Figure 2.13.
Question 28

The average perception time (time taken to identify a hazard) for an alert driver is one and three-quarter seconds. At 55 mph, how far will you travel in this time?

A
519 feet
B
142 feet
C
319 feet
D
219 feet
Question 28 Explanation: 
5.4.4 – Stopping Distance Figure 5.6 2.6.1 – Stopping Distance Perception Distance + Reaction Distance + Braking Distance = Total Stopping Distance • Perception Distance. The distance your vehicle travels, in ideal conditions, from the time your eyes see a hazard until your brain recognizes it. Keep in mind certain mental and physical conditions can affect your perception distance. It can be affected greatly depending on visibility and the hazard itself. The average perception time for an alert driver is 1¾ seconds. At 55 mph this accounts for 142 feet traveled. Figure 2.11
Question 29

According to the Handbook, children present a hazard because

A
they often have grudges against truck drivers
B
they move quickly without checking traffic
C
they don't know that trucks are dangerous
D
they don't know how to drive
Question 29 Explanation: 
2.8.3 – Drivers who are Hazards Children. Children tend to act quickly without checking traffic. Children playing with one another may not look for traffic and are a serious hazard.
Question 30

At 80 mph, the force of your impact if you strike a person or vehicle will be how much greater than if you were traveling at 20 mph?

A
12 times
B
16 times
C
8 times
D
4 times
Question 30 Explanation: 
2.6.1 – Stopping Distance The Effect of Speed on Stopping Distance. The faster you drive, the greater the impact or striking power of your vehicle. When you double your speed from 20 to 40 mph the impact is 4 times greater. The braking distance is also 4 times longer. Triple the speed from 20 to 60 mph and the impact and braking distance is 9 times greater. At 60 mph, your stopping distance is greater than the length of a football field. Increase the speed to 80 mph and the impact and braking distance are 16 times greater than at 20 mph. High speeds greatly increase the severity of accidents and stopping distances. By slowing down, you can reduce braking distance.
Question 31

When crossing a railroad track, you should never...?

A
Do any of these things
B
Accelerate
C
Slow down
D
Change gear
Question 31 Explanation: 
2.15.5 – Crossing the Tracks Railroad crossings with steep approaches can cause your unit to hang up on the tracks. Never permit traffic conditions to trap you in a position where you have to stop on the tracks. Be sure you can get all the way across the tracks before you start across. It takes a typical tractortrailer unit at least 14 seconds to clear a single track and more than 15 seconds to clear a double track. Do not shift gears while crossing railroad tracks.
Question 32

Tests have shown that trucks with a high center of gravity can roll over on curves when traveling...?

A
15 mph over the speed limit
B
10 mph over the speed limit
C
20 mph over the speed limit
D
At the speed limit
Question 32 Explanation: 
8.2 – Driving Tank Vehicles 8.2.1 – High Center of Gravity High center of gravity means that much of the load’s weight is carried high up off the road. This makes the vehicle top-heavy and easy to roll over. Liquid tankers are especially easy to roll over. Tests have shown that tankers can turn over at the speed limits posted for curves. Take highway curves and on ramp/off ramp curves well below the posted speeds.
Question 33

If you are stopped on an incline, how can you start moving without rolling back?

A
Shift to neutral
B
Apply the parking brake
C
Aggressively pump the accelerator
D
Fully engage the clutch
Question 33 Explanation: 
2.2 – Basic Control of Your Vehicle 2.2.1 – Accelerating Do not roll back when you start. You may hit someone behind you. If you have a manual transmission vehicle, partly engage the clutch before you take your right foot off the brake. Put on the parking brake whenever necessary to keep from rolling back. Release the parking brake only when you have applied enough engine power to keep from rolling back. On a tractor-trailer equipped with a trailer brake hand valve, the hand valve can be applied to keep from rolling back. Speed up smoothly and gradually so the vehicle does not jerk. Rough acceleration can cause mechanical damage. When pulling a trailer, rough acceleration can damage the coupling. When starting a bus on a level surface with good traction, there is often no need for the parking brake. Speed up very gradually when traction is poor, as in rain or snow. If you use too much power, the drive wheels may spin. You could lose control. If the drive wheels begin to spin, take your foot off the accelerator.
Question 34

What is the safest speed when you are driving in heavy traffic?

A
The speed of other traffic (if not illegal or unsafe)
B
The posted speed limit
C
15 mph below the speed of other traffic
D
As fast as possible, to get out of the way
Question 34 Explanation: 
2.6.5 – Speed and Traffic Flow When you are driving in heavy traffic, the safest speed is the speed of other vehicles. Vehicles going the same direction at the same speed are not likely to run into one another. In California, speed limits are lower for trucks and buses than for cars. It can vary as much as 15 mph. Use extra caution when you change lanes or pass on these roadways. Drive at the speed of the traffic, if you can without going at an illegal or unsafe speed. Keep a safe following distance.
Question 35

If your vehicle has curved (also called convex, fisheye, spot, bugeye) mirrors, you must remember that objects will appear...?

A
Smaller and closer than they are
B
Larger and closer than they are
C
Smaller and further away than they are
D
Larger and further away than they are
Question 35 Explanation: 
2.4.2 – Seeing to the Sides and Rear How to use Mirrors. Use mirrors correctly by checking them quickly and understanding what you see. When using your mirrors while driving on the road, check them quickly. Look back and forth between the mirrors and the road ahead. Do not focus on the mirrors for too long. Otherwise, you will travel quite a distance without knowing what is happening ahead. Many large vehicles have curved (convex, “fisheye,” “spot,” “bugeye”) mirrors that show a wider area than flat mirrors. This is often helpful. But everything appears smaller in a convex mirror than it would if you were looking at it directly.
Question 36

When making a turn, you should turn off your signal...?

A
Once your turn is fully completed
B
Once past the apex of the turn
C
Once 75% of the turn is completed
D
As soon as you begin to turn
Question 36 Explanation: 
2.5 – Communicating 2.5.1 – Signal Your Intentions Other drivers cannot know what you are going to do until you tell them. Signaling what you intend to do is important for safety. Here are some general rules for signaling. Turns. There are 3 good rules for using turn signals: 1. Signal Early. Signal well before you turn. It is the best way to keep others from trying to pass you. 2. Signal Continuously. You need both hands on the wheel to turn safely. Do not cancel the signal until you have completed the turn. 3. Cancel Your Signal. Do not forget to turn off your turn signal after you have turned (if you do not have self-canceling signals).
Question 37

What is a problem that you can have when using your mirrors?

A
They are of no help when you are changing lanes
B
They never remain in the positions you have placed them
C
There are blind spots that your mirrors cannot show you
Question 37 Explanation: 
2.4.2 – Seeing to the Sides and Rear Figure 2.7 SCHOOL BUS: 10.1.3 – Outside Left and Right Side Flat Mirrors These mirrors are mounted at the left and right front corners of the bus at the side or front of the windshield. They are used to monitor traffic, check clearances, and check for students on the sides and to the rear of the bus. There is a blind spot immediately below and in front of each mirror and directly in back of the rear bumper. The blind spot behind the bus extends 50 to 150 feet and could extend up to 400 feet depending on the length and width of the bus.
Question 38

Where should you place your reflectors when stopped on a divided highway or one lane highway?

A
20 feet, 50 feet, and 100 feet toward approaching traffic
B
10 feet, 100 feet, and 200 feet toward approaching traffic
C
50 feet, 100 feet, and 150 feet toward approaching traffic
D
100 feet, 200 feet, and 300 feet toward approaching traffic
Question 38 Explanation: 
2.5.2 – Communicating Your Presence When Parked at the Side of the Road. When you pull off the road and stop, be sure to turn on the 4-way emergency flashers. This is important at night. Do not trust the taillights to give warning. Drivers have crashed into the rear of a parked vehicle because they thought it was moving normally. If you must stop on a road or the shoulder of any road, you must put out your emergency warning devices within 10 minutes. Place your warning devices at the following locations: If you must stop on or by a one-way or divided highway, place warning devices 10 feet, 100 feet, and 200 feet toward the approaching traffic. See Figure 2.8.
Question 39

Should you always be looking into the distance ahead?

A
Yes, you should be prepared for all problems ahead
B
No, you should shift your attention back and forth, near and far
C
Yes, by concentrating on the vehicle directly ahead you will be prepared for all emergencies
Question 39 Explanation: 
2.4 – Seeing To be a safe driver you need to know what’s going on all around your vehicle. Not looking properly is a major cause of accidents. 2.4.1 – Seeing Ahead All drivers look ahead; but many do not look far enough ahead. Importance of Looking far Enough Ahead. Because stopping or changing lanes can take a lot of distance, knowing what the traffic is doing on all sides of you is very important. You need to look well ahead to make sure you have room to make these moves safely. How far Ahead to Look. Most good drivers look at least 12 to 15 seconds ahead. That means looking ahead the distance you will travel in 12 to 15 seconds. At lower speeds, that’s about one block. At highway speeds it is about a quarter of a mile. If you are not looking that far ahead, you may have to stop too quickly or make quick lane changes. Looking 12 to 15 seconds ahead does not mean not paying attention to things that are closer. Good drivers shift their attention back and forth, near and far. Figure 2.6 illustrates how far to look ahead.
Question 40

Which of these equals the total stopping distance?

A
Perception distance + reaction distance + braking distance
B
Reaction distance + braking distance
C
Perception distance + reaction distance
D
Reaction distance + braking distance + signal distance
Question 40 Explanation: 
2.6.1 – Stopping Distance Perception Distance + Reaction Distance + Braking Distance = Total Stopping Distance
Question 41

You're pulled over for weaving between lanes. If you refuse to take an alcohol sobriety test, you may be disqualified just as if you WERE driving under the influence (DUI). This is because...

A
reasonable cause law
B
higher standard of care law
C
none of the above
D
implied consent law
Question 41 Explanation: 
1.3.2 – Alcohol, Leaving the Scene of an Accident, and Commission of a Felony It is illegal to operate a CMV if your BAC is .04 percent or more. If you operate a CMV, you shall be deemed to have given your consent to alcohol testing. You will lose your CDL for at least 1 year for a first offense for: • Driving a CMV if your BAC is .04 percent or higher. • Driving a CMV under the influence of alcohol. • Refusing to undergo blood alcohol testing. Page 1-22 A driver is disqualified from operating a Commercial Motor Vehicle (CMV) if convicted of any of the following offenses while operating either a COMMERCIAL or NONCOMMERCIAL motor vehicle (non-CMV): Refusing to take DUI test required by implied consent laws
Question 42

If you do not have a Hazardous Materials Endorsement on your CDL, you can

A
transport hazardous materials if your employer lets you
B
not transport any type of hazardous material
C
drive a vehicle that carries hazardous materials if it does not require placards
D
only transport liquid hazardous materials
Question 42 Explanation: 
2.23.3 – Lists of Regulated Products Identification Numbers Not all vehicles carrying hazardous materials need to have placards. The rules about placards are given in Section 9 of this handbook. You can drive a vehicle that carries hazardous materials if it does not require placards. If it requires placards, you cannot drive it unless your DL has the HazMat endorsement. See Figure 2.25.
Question 43

Suspension systems…

A
Keep the brake drums from failing
B
Keep the axles in place
C
Keep the steering wheel tight
D
Keep the load secure
Question 43 Explanation: 
2.1.3 – What to Look For Suspension System Defects The suspension system holds up the vehicle and its load. It keeps the axles in place.
Question 44

What are some steering system defects to look for?

A
Steering wheel play of two degrees
B
Missing nuts, bolts, cotter keys or other parts; bent, loose or broken parts
C
Steering wheel play of five degrees
Question 44 Explanation: 
2.1.3 – What to Look For Steering System Defects • Missing nuts, bolts, cotter keys, or other parts. • Bent, loose, or broken parts, such as steering column, steering gear box, or tie rods. • If power steering equipped, check hoses, pumps, and fluid level; and check for leaks. • Steering wheel play of more than 10 degrees (approximately 2 inches movement at the rim of a 20-inch steering wheel) can make it hard to steer.
Question 45

During a seven-step inspection, checking the engine compartment does NOT include checking

A
the engine oil level
B
the oil pressure gauge
C
the battery fluid level
D
the coolant level in the radiator
Question 45 Explanation: 
2.1.5 – 7-Step Inspection Method Step 2: Check the Engine Compartment Check that the parking brakes are on and/or wheels chocked. You may have to raise the hood, tilt the cab (secure loose things so they do not fall and break something), or open the engine compartment door. Check the following: • Engine oil level. • Coolant level in radiator; condition of hoses. • Power steering fluid level; condition of hose (if so equipped). • Windshield washer fluid level. • Battery fluid level, connections and tie downs (battery may be located elsewhere). • Automatic transmission fluid level (may require engine to be running). • Check belts for tightness and excessive wear (alternator, water pump, air compressor). Know how much “give” the belts should have when adjusted right, and check each one. • Engine compartment for leaks (fuel, coolant, oil, power steering fluid, hydraulic fluid, battery fluid). • Electrical wiring insulation for cracks and wear. Lower and secure
Question 46

If your vehicle's landing gear is power-operated, you will need to check for

A
Air or hydraulic leaks
B
Water
C
Oil on the ground
D
None of the listed answers
Question 46 Explanation: 
11.5.2 – Side of Trailer Landing Gear • Check that the landing gear is fully raised, has no missing parts, the crank handle is secure, and the support frame is not damaged. • If power operated, check for air or hydraulic leaks.
Question 47

A commercial motor vehicle (CMV) is defined as...

A
A vehicle with a gross weight over 26,001 lbs.
B
A vehicle transporting 16 or more passengers
C
All of the above
D
A vehicle transporting hazardous materials
Question 47 Explanation: 
Section 1: Introduction (1-1) Who Needs a CDL You Must Have a CDL to Operate: • Any single vehicle with a gross vehicle weight rating (GVWR) of 26,001 pounds or more.
Question 48

Which of the following are potential suspension system defects?

A
Leaking shock absorbers
B
All of the above
C
Broken leaf in a spring
D
Cracked or broken spring hangers
Question 48 Explanation: 
2.1.3 – What to Look For Suspension System Defects Cracked or Broken Spring Hangers. • Missing or broken leaves in any leaf spring. If ¼ or more are missing, it will put the vehicle “out of service,” but any defect could be dangerous. Broken leaves in a multi-leaf spring or leaves that have shifted so they might hit a tire or other part. • Leaking shock absorbers. • Torque rod or arm, u-bolts, spring hangers, or other axle positioning parts that are cracked, damaged, or missing. • Air suspension systems that are damaged and/ or leaking. See Figure 2.4. • Any loose, cracked, broken, or missing frame members. Exhaust System Defects A broken exhaust system can let poison fumes into the cab or sleeper berth. Look for: • Loose, broken, or missing exhaust pipes, mufflers, tailpipes, or vertical stacks. • Loose, broken, or missing mounting brackets, clamps, bolts, or nuts. • Exhaust system parts rubbing against fuel system parts, tires, or other moving parts of the vehicle. • Exhaust system parts that are leaking.
Question 49

As you check your signal lights, you should...?

A
Wipe each one clean
B
Tick each one off on a list
C
Do all of these things
D
Tap the bulb of each one
Question 49 Explanation: 
Step 6: Check the Signal Lights Get in and Turn off the Lights • Turn off all the lights. • Turn on the stop lights (apply the trailer hand brake or have a helper put on the brake pedal). • Turn on the left turn signal lights. Get out and Check the Lights • Left front turn signal light is clean, operating, and the proper color (amber or white on signals facing the front). • Left rear turn signal light and both stop lights are clean, operating, and the proper color (red, yellow, or amber). Note: Checks of the brake, turn signal, and 4-way flasher functions must be done separately. Get in the Vehicle • Turn off the lights not needed for driving. • Check for all the required papers, trip manifests, permits, etc. • Secure all loose articles in the cab (they might interfere with the operation of the controls or hit you in an accident). • Start the engine.
Question 50

Which of these should you do during a trip as part of your en route inspection?

A
Check critical items when you stop, such as brakes, tires, and lights
B
Do all of the above
C
Pay attention with your senses to possible problems
D
Watch your gauges to check for trouble
Question 50 Explanation: 
2.1.2 – Types of Vehicle Inspections Trip Inspection For safety during a trip, you should: • Watch gauges for signs of trouble. • Use your senses to check for problems (look, listen, smell, feel). Check critical items when you stop: • Tires, wheels, and rims. • Brakes. • Lights and reflectors. • Brake and electrical connections to trailer. • Trailer coupling devices. • Cargo securement devices.
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Timed Test 5

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