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180 CDL General Knowledge Test Prep Question and Answers

1. The total weight of a unit, the trailer and the cargo is called:

A. the gross combination weight

2. Implied consent means:

A. that you have given your consent to be tested for a alcohol in your bleed

3. For the first offense for driving a commercial vehicle under the influence of alcohol or drugs you will loose your CDL for at least:

A. 1 year

4. You are checking your tires for a pre- trip inspection. Which of these statements is true?

A. Radial and bias-ply tires can be used together on the same vehicle

5. You are checking your wheels and rims for a per- trip inspection. Which of these statements is true?

A. rust around wheel nuts may mean that they are loose

6. You are checking your brakes and suspension system for a pre-trip inspection,. Which of these statements are true?

A. Break shoes should not have oil grease or brake fluid on them.

7. You are checking your steering and exhaust system in a pre-trip inspection. Which problem if found should be fixed before the vehicle is driven?

A. steering wheel play of more than 10 degrees

8. How many missing or broken leaves in any leaf springs well cause a commercial vehicle to be placed out of service?

A. ¼ the total number

9. After you make a vehicle inspection report you must sign it:

A. when any defects are noted whether they are certified to be repaired


11. Which of these is not part of the pre-trip inspection of the engine compartment?

A. Valve clearance

12. Which of these items are not checked in a pre-trip inspection?

A. Amount of fuel in the vehicle

13. After starting the engine:

A. The coolant temperature gauge should gradually begin to raise to normal

14. Which of these lights can not be checked at the same time:

A. Turn signals, brake lights, and four-way flashers

15. Which of these pieces of emergency equipment should always be carried in your vehicle?

A. Warning devices for parked vehicles

16. Optional safety equipment may include emergency phone numbers, tire chains, and:

A. tire changing equipment
17. During the pre-trip inspection you should check the wheel bearing seals to determine that they:

A. Do not leak

18. Which of these should not be tested while the vehicle is stopped:

A. Service brake

19. When should you wear a seat belt?

A. Any time you are in a moving vehicle

20. You are driving a heavy vehicle with a manual transmission. You have to stop the vehicle on he shoulder while driving on an uphill grade. Which of these is a good rule to follow when putting it back in motion up the grade?

A. Use the parking brake to hold the vehicle until the clutch engages.

21. You are starting to move up a hill from a stop:

A. Release the parking brake as you apply engine power.

22. Which of these is not a danger of rough acceleration?

A. Tire damage

23. What is a proper way to hold a steering wheel?

A. With both hands, on opposite sides of the wheel

24. You should try to park so that:

A. You can put forward away from the curb

25. Backing a commercial vehicle is:

A. Always dangerous
26. Which of these statements about backing a heavy vehicle is true?

A. You should avoid backing whenever you can

27. Which of these statements is a good rule to follow when backing your vehicle?

A. Use a helper whenever possible

28. Which of these statements about backing a heavy vehicle is not true?

A. Because you can’t see, you should back slowly until you softly back into the dock

29. Which of these statements about double-clutching and shifting is true?

A. You can use tachometer to tell you when to shift.

30. Which of these is not a type of retarder?

A. Robotics

31. The purpose of retarders is to:

A. Help slow the vehicle you are driving and reduce brake wear

32. Retarders:

A. Can cause the drive wheels to skid when they have poor traction

33. The distance you should look ahead of your vehicle while driving amounts to about __________ miles for highway speed

A. ¼

34. How far should a driver look ahead of a vehicle while driving?

A. 12 – 15 seconds

35. Which of these is true about mirror adjustments?

A. You should adjust your mirror prior to starting your trip

36. In your mirror, you see a car approaching from the rear. The next time you check your mirror you do not see the car. You wish to change lanes you should:

A. Wait to change lanes until you are sure the car is not in your blind spots

37. What should you use your mirrors to check?

A. Where the rear of your vehicle is while making turns.

38. Merging into a roadway is safest:

A. Wait for a large enough gap in the traffic to enter the road.

39. Convex mirrors:

A. Shows a wider view than a flat mirror shows.

40. Which of these is the proper way to signal to changes lanes?

A. Signal early, change lanes slowly and smoothly.

41. Which of these statements about using turn signals is true?

A. When turning, you should signal early.

42. You should signal continuously while turning because:

A. You need both hands on the wheel to turn safely.

43. When you are passing another vehicle, pedestrians, or bicyclists, you should assume that:

A. They may move into your traffic lane.

44. The Driver’s Manual suggests several things to do when you pass a vehicle. Which of these is not one of them?

A. At night, turn on your high beams before you start to pass and leave them on until you have completely passed the vehicle.

45. When you are parked at the side of the road at night you must:

A. Turn on your four way emergency flashers to warn others.

46. You are stopped on a one way or divided highway. You should place reflective triangles at:

A. 10ft, 100ft, 200ft toward approaching traffic

47. Which of these statements about marking a stopped vehicle is true?

A. If a hill or curve keeps drivers behind you from seeing the vehicle with 500ft, the rear reflective triangles should be moved back down the road to give adequate warning.

48. For your safety, when setting out reflective triangles you should:

A. hold the triangles between yourself and oncoming traffic

49. According to the Driver’s Manual, why should you limit the use of your horn?

A. It can startle other drivers

50. What three things add up to the total stopping distance of your truck or bus?

A. Perception distance, reaction distance, and braking distance

51. You are driving a vehicle at 55mph on dry pavement. About how much total stopping distance will you need to bring it to a stop?

A. The length of a football field

52. Which of these statements about brakes is true?

A. The heavier a vehicle or the faster it is moving, the more heat the brakes have to absorb to stop it

53. How does vehicle weight affect stopping?

A. Empty trucks could take longer to stop than if loaded, but this is not normally the case for buses

54. When ever you double your speed, the vehicle has about ______ times, the destructive power if it crashes.

A. 4

55. Which of these statements is true about bad weather and driving conditions?

A. When the temperature drops, bridges will freeze before roads begin to

56. Which of these statements about speed management is true?

A. When the road is slippery, it will take longer to stop and it will be harder to turn without skidding.

57. What should you do when your vehicle hydroplanes?

A. Release the accelerator

58. Why does your vehicle speed naturally increase on downgrades:

A. Gravity

59. You are driving a heavy vehicle. You must exit a highway using an off ramp that curves downhill. You should:

A. Slow down to a safe speed before the curve

60. You are driving a vehicle that could safely be driven at 55mph on an open road. But traffic is now heavy, moving at 35mph though the speed limit is 55. The safest speed for your vehicle is most likely:

A. 35mph

61. You are driving a 40 foot vehicle at 35mph. The road is dry and visibility is good. What is the least amount of space that you should keep in front of your vehicle to be safe?

A. 4 seconds

62. You are driving a 40 foot vehicle at 50mph. The road is dry and visibility is good. What is the least amount of space that you should keep in front of your vehicle to be safe?

A. 5 seconds

63. If you are being tailgated, you should:

A. Increase your following distance
64. Which of these is not proper use of vehicle lights?

A. Flashing your brake lights to get someone off your tail.

65. Extra care is needed to keep your vehicle centered in your lane because commercial vehicles:

A. Are often wider than other vehicles

66. Which of these statements about overhead clearance is true?

A. The weight of the cargo can change the height of the vehicle.

67. What should you do if you are unsure whether you have enough over head clearance?

A. Find another route that will not require driving under the object

68. Strong winds most affect driving:

A. Upon exiting the tunnel

69. Which of these usually true about driving in tunnels?

A. There may be cross winds while exiting

70. What is the term for a commercial vehicle’s habit of swinging wide on turns?

A. Off track

71. Which of these is a good thing to remember when crossing or entering traffic with a heavy vehicle?

A. Heavy vehicles need larger gaps in traffic than cars

72. You must cross the on coming lane as you make a turn, you should:

A. Watch for on coming traffic

73. For this item refer to the drawing below. You are driving a long vehicle that take wide turns. You want to make a left turn from Pine St to Cedar St, both are two way streets. You should:

A. Begin turning your vehicle when you are half way through the intersection.

74. What is the best advice for drivers when a heavy fog occurs?

A. Park in a rest area or truck stop until the fog has lifted.

75. You are driving in cold weather, your tire tread should?

A. Provide enough traction to steer and push the vehicle through the snow

76. Which of these will probably not help your wind shield becomes covered with ice?

A. Brush

77. Which of these systems should receive extra attention during winter weather inspection?

A. Exhaust

78. Why is a break in the exhaust system dangerous?

A. Poison fumes can enter the cab or sleeper berth

79. If the roads are slippery, you should:

A. Make turns as gently as possible

80. Your brakes can get wet when you drive through a heavy rain. What can this cause when the brakes are applied?

A. Trailer jack knife

81. You should avoid driving through deep puddles or flowing water. But if you must, which of these steps can help keep your brakes working?

A. Gently putting on the brakes while driving through the water.

82. Which of these is especially true about your tires in hot weather?

A. You should check tire mounting and air pressure before driving

83. What would allow an engine to keep cool in hot weather?

A. Make sure the engine has a right amount of oil

84. When a coolant container is part of a pressurized system, which of these is true?

A. You can check the coolant level of a hot engine.

85. Which of these is not true about engine belts in hot water?

A. Cracking is likely to occur but it is not a safety threat

86. In mountain driving you have to use lower gears to drive safely on grade. Which of these does not affect your choice of gears?

A. Tire tread type

87. The engine braking affect is greatest when the engine is __________ the governed RPM and the transmission is in the ________ gear.

A. Near; Lower

88. You are driving a new truck with manual transmission. What gear will you probably have to use to take a long, steep downhill grade?

A. A lower gear than you would to climb the hill

89. What should you do before driving in the mountains?

A. Know the escape ramp location along the route

90. A car suddenly cuts in front of you creating a hazard. Which of these actions should you not take?

A. Honk your horn and stay close behind the car.

91. When driving through work zones, you should:

A. Watch for large pavement drop off

92. You can see a marking on a vehicle ahead of you. The marking is a red triangle with an orange center. What does the marking mean?

A. It may be a slow moving vehicle

93. Which of statements about hazards is true?

A. Movement inside a parked car could mean that a person is about to step out of it.

94. The best drivers are those who watch and prepare for hazards. This is called being:

A. Defensive

95. Which of these is correct about emergency and evasive action?

A. In order to turn quickly you must have a firm grip on the steering wheel.

96. Your vehicle’s in a traffic emergency and may collide with another vehicle if you do not take action. Which of these is a good rule to remember at such a time?

A. You can almost always turn or miss an obstacle more quickly than you can stop.

97. Which of these a good thing to do when steering to avoid a crash?

A. Don’t turn any more than you need to clear the hazard.

98. Which of these statements about emergency steering is true?

A. If an oncoming driver drifts into your lane, a move to the right might be best.

99. What is countersteering?

A. Turning the wheel back in the other direction after steering to avoid a traffic emergency.

100. If you need to leave the road in a traffic emergency you should

A. Avoid braking until your speed has dropped to about 20mph

101. Controlled braking:

A. It is used to keep the vehicle in a straight line while braking

102. What does emergency braking mean?

A. Responding to hazard by slowing the vehicle.

103. Stab braking should not be used with:

A. Anti-lock brakes

104. Hydraulic brakes fail while driving. The system will not build up pressure and brake pedal will feel spongy or go to the floor. What actions should you take?

A. Pump the brake pedal to generate pressure.

105. Truck escape ramp:

A. Help avoid damage to vehicles.

106. What is the first thing you should do if your brakes fail while going down a hill?

A. Get off the road as soon as possible

107. Which of the below is not characteristics of a front tire failure?

A. Vehicle fish tail

108. Which of these happens when a tire blows out at a high rate of speed?

A. Vibrating feeling

109. You are driving on a straight level highway at 50mph, there are no vehicles in front of you. Suddenly, a tire blows out on your vehicle. What should you do first?

A. Stay off the brake until the vehicle has slowed down

110. Most serious skids result from:

A. Driving too fast for conditions

111. How do you correct a rear wheel acceleration skid?

A. Stop accelerating

112. You are starting your vehicle in motion from a stop. As you apply power to the drive wheels, they start to spin. You should:

A. Take your foot off the accelerator

113. Which of these is true about rear drive wheel braking skids?

A. Vehicles with trailers, the trailer can push the towing vehicle sideways

114. If a straight vehicle (no trailer or articulation) goes into a front wheel skid. It will:

A. Go straight ahead even if the steering wheel is turned.

115. You do not have a CB Radio , what is the first thing you should do at an accident scene?

A. Protect the area.

116. Which of these is not a good rule to follow when caring for injured at an accident scene?

A, Keep injured person cool.

117. Which of these statements about causing vehicle fires is true?

A. Poor trailer ventilation can cause cargo to catch fire.

118. During a vehicle inspection checking the __________ will not help.

A. Battery fluid level

119. Which fires can you use water to put out?

A. Tire fires

120. If you are not sure what to use to put out hazardous material fire, you should:

A. Wait for qualified fire fighters.

121. Which statement is true?

A. Many heavy vehicle accidents occur between midnight and 6AM

122. Which of these statements about staying alert to drive is true?

A. Sleep is the only thing that overcomes fatigue.

123. Which of these statements about drinking alcohol is true?

A. A few beers have the same effect on driving as a few shots of whiskey or a few glasses of wine.

124. To determine the blood alcohol concentrate for a person it is necessary to know:

A. How much the person weighs

125. Which of these is a good thing to remember about drinking alcohol?

A. Alcohol first affects judgment and self control which are necessary for safe driving.

126. Which of these is true regarding the use of drugs while driving?

A. Prescription drugs are allowed if the doctor says the drugs will not affect safe driving ability.

127. Which of these statements is true about hazardous materials?

A. All hazardous material present a health and safety threat.

128. Which of these about shipping hazardous material is true?

A. A 4inch diamond shape hazardous material label must be on the container.

129. Where must you keep shipping papers when transporting hazardous materials?

A. In the pouch of the driver’s door or on the driver’s seat.

130. Placards must be:

A. Placed on all four sides of the vehicle

131. You do not have a hazardous material endorsement on your commercial driver’s license, you can drive a vehicle containing hazardous material when:

A. The vehicle does not require placards.

132. Cargo inspection:

A. Should be performed after every break you take while driving.

133. A vehicle loaded with most of the weight on the steering axle. What are the results?

A. Hard steering and possible damage to the tires.

134. The center of gravity of a load:

A. Can make a vehicle more likely to tip over on curves if it is high

135. Cargo that can shift should have at least ________ tiedown(s).

A. 2

136. To prevent shifting, there should be at least one tiedown for every ______ feet of cargo.

A. 10

137. Containerize trailers:

A. Are generally used when freight is carried partway by rail or shipping.

138. One reason Dry Bulk tanks requires special care is:

A. The load can shift.

139. Which of these statements about certain types of cargo is true?

A. Unstable loads such as hanging meat or livestock can require extra caution on curves.

140. A full stop is required at a rail road grade crossing when:

A. The nature of the cargo makes it mandatory under state and federal regulation.

141. When starting a bus on a level surface with good traction, there is often no need for:

A. The parking brake

142. Which do not provide extra gears some trucks:

A. Automatic transmission

143. You should use your horn when:

A. Help avoid a crash

144. Most skids;

A. Are caused by going too fast, or trying to stop quickly.

145. Which of these are true about tire pressure:

A. Air pressure in the tire increases with temperature
146. You need at least ______ inch thread depth on every major groove in the front tires:

A. 4/32

147. During an inspection of hydraulic brakes. You should pump the brake pedal three times then apply firm pressure to the pedal for five seconds. If the brakes are working then the pedal should:

A. Not move

148. Drivers of trucks and truck-tractors cargo must check that the cargo is all secure within the first _______ miles of the trip.

A. 25

149. Medicines used to treat the common cold:

A. Often make you sleepy and thus should not be use while driving.

150. You will be placed out of service for 24 hours if you blood alcohol concentrate is:

A. At least .04

151. What should you do when you see a hazard in the road way ahead of you:

A. Use your 4 way flasher or brake lights to warn others

152. Which of these is true about other drivers:

A. Short term or daily rental truck drivers often are not use to limited vision and pose a hazard.

153. Bridge formulas:

A. Permit less maximum axle weight for axle that are close together

154. Where or how is cargo blocking used:

A. The front, back, and/or sides of the cargo

155. Over length, over width and over weight loads:

A. Require a special transport permit

156. Which of these is true about hours of service:

A. You should balance your hours of service to get enough sleep to keep you alert

157. To prevent brake fade you should:

A. Select a gear, which would keep your vehicle to a safe speed on steep down grades.

158. Which of these is not true about braking in an emergency situation?

A. It is not important of how you brake in an emergency situation

159. In the event of a rear tire failure dual rear tire:

A. Will usually prevent a fist tail

160. If your brakes fail on a downgrade you must first:

A. Look outside the vehicle for another means of slowing it

161. If you are forced to return to the road before stopping on the shoulder, the best procedure is:

A. Using mirrors and turn signals turn sharply to get back on the road

162. The distance that you should look ahead of your vehicle while driving at low speed is about:

A. 1 block

163. You should always turn on your 4 way flashers when you:

A. Park on the side of the road

164. You must stop on a hill or curve on a two lane two way road. How far back should you place reflective triangles?

A. Within 500ft behind the vehicle

165. Tire chains:

A. Should always be carried when driving in winter weather.

166. What happens to tar and road pavement during hot weather?

A. It bleeds making the road surface slippery

167. In bad weather, many car drivers tailgate large vehicles. What should you do?

A. Increase following distance so you can avoid the need to make a quick change.

168. Which of these is a danger of crossing railroad tracks on dirt roads?

A. You can get hung up half way across the tracks

169. When driving on grades which of these is the best way to choose a safe speed?

A. Based on your vehicle and its cargo, select a safe speed that is within the posted limit.

170. The speed at which you drive should be determined by:

A. Your visibility.

171. The space ________ your vehicle is the most important to manage.

A. In front of

172. When driving at night you should use your low beams. When an oncoming vehicle is within:

A. 500 ft

173. Which of these actions is not recommended for left turn:

A . Start in the inside lane and swing right as you turn

174. A full stop is required at a railroad grade crossing when:

A. The nature of the cargo makes a stop necessary under state and federal regulation

175. When approaching a bridge on a two lane road you should:

A. Check the weight limit of the bridge

176. You should lightly apply your brakes to flash the brake light if:

A. You’re about to exit the road and need to slow down

177. If possible a helper should be used to help back a vehicle:

A. When ever you have to back

178. Which of these is true about notifying authority after an accident occurs:

A. If you have CB Radio use it to notify the police before exiting your vehicle.

179. When there’s a vehicle fire, get your vehicle off the road and

A. Notify emergency services

180. You should wear your seat belt in a moving vehicle:

A. At all times

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